Voss, R., Diehl, R., Hartmann, D. H., Cervino, M., Vink, J. S., Meynet, G., ...
We developed a new population synthesis code for groups of massive stars, where we model the emission of different forms of energy and matter from the stars of the association. In particular, the...
Radiation from relativistic shocks with turbulent magnetic fields (2009)
Niemiec, J., Medvedev, M., Zhang, B., Hardee, P., Nordlund, A., ...
Using our new 3-D relativistic electromagnetic particle (REMP) code parallelized with MPI, we investigated long-term particle acceleration associated with a relativistic electron-positron jet...
Niemiec, J., Hardee, P. E., Medvedev, M., Sol, H., Mizuno, Y., ...
Plasma instabilities (e.g., Buneman, Weibel and other two-stream instabilities) excited in collisionless shocks are responsible for particle (electron, positron, and ion) acceleration. Using a new...
Nuclear Resonances: The quest for large column densities and a new tool (2009)
Greiner, J., Boggs, S. E., DiCocco, G., Freese, K. T., Gehrels, N., Hartmann, D. H., ...
Nuclear physics offers us a powerful tool: using nuclear resonance absorption lines to infer the physical conditions in astrophysical settings which are otherwise difficult to deduce. Present-day...
In Situ Probes of the First Galaxies and Reionization: Gamma-ray Bursts (2009)
McQuinn, Matthew, Bloom, Joshua S., Grindlay, Jonathan, Band, David, Barthelmy, S. D., Berger, E., ...
The first structures in the Universe formed at z>7, at higher redshift than all currently known galaxies. Since GRBs are brighter than other cosmological sources at high redshift and exhibit simple...
Astrophysics with Radioactive Atomic Nuclei (2009)
Diehl, R., Von Ballmoos, P., Boggs, S., Burkert, A., Chieffi, A., Gehrels, N., ...
We propose to advance investigations of electromagnetic radiation originating in atomic nuclei beyond its current infancy to a true astronomy. This nuclear emission is independent from conditions of...
GRB 080913 at redshift 6.7 (2009)
Greiner, J., Krühler, T., Fynbo, J. P. U., Rossi, A., Schwarz, R., Klose, S., ...
The very short supersoft X-ray state of the classical nova M31N 2007-11a (2009)
Henze, M., Pietsch, W., Sala, G., Della Valle, H., Hernanz, M., Greiner, J., ...
Henze, M., Pietsch, W., Haberl, F., Sala, G., Quimby, R., Hernanz, M., ...
GRB polarimetry with POET (2009)
McConnell, M. L., Angelini, L., Baring, M. G., Barthelmy, S., Black, J. K., Bloser, P. F., ...
The very short supersoft X-ray state of the classical nova M31N 2007-11a (2008)
Henze, M., Pietsch, W., Sala, G., Della Valle, M., Hernanz, M., Greiner, J., ...
Short supersoft X-ray source (SSS) states (durations < 100 days) of classical novae (CNe) indicate massive white dwarfs which are candidates for the progenitors of supernovae type Ia. We carry out a...
Henze, M., Pietsch, W., Haberl, F., Sala, G., Quimby, R., Hernanz, M., ...
Optical novae have been found to represent the major class of supersoft X-ray sources (SSS) in our neighbour galaxy M 31. We present the two first SSSs ever discovered in the M 31 globular cluster...
POET: POlarimeters for Energetic Transients (2008)
Hill, J. E., McConnell, M. L., Bloser, P., Legere, J., Macri, J., Ryan, J., ...
POET (Polarimeters for Energetic Transients) is a Small Explorer mission concept proposed to NASA in January 2008. The principal scientific goal of POET is to measure GRB polarization between 2 and...
GRB 080913 at redshift 6.7 (2008)
Greiner, J., Kruehler, T., Fynbo, J. P. U., Rossi, A., Schwarz, R., Klose, S., ...
We report on the detection by Swift of GRB 080913, and subsequent optical/near-infrared follow-up observations by GROND which led to the discovery of its optical/NIR afterglow and the recognition of...
New Relativistic Particle-In-Cell Simulation Studies of Prompt and Early Afterglows from GRBs (2008)
Niemiec, J., Sol, H., Medvedev, M., Zhang, B., Nordlund, A., ...
Nonthermal radiation observed from astrophysical systems containing relativistic jets and shocks, e.g., gamma-ray bursts (GRBs), active galactic nuclei (AGNs), and microquasars commonly exhibit...
A photometric redshift of $z=1.8^{+0.4}_{-0.3}$ for the \agile GRB 080514B (2008)
Rossi, A., Postigo, A. De Ugarte, Ferrero, P., Kann, D. A., Klose, S., Schulze, S., ...
Aims: The AGILE gamma-ray burst GRB 080514B is the first burst with detected emission above 30 MeV and an optical afterglow. However, no spectroscopic redshift for this burst is known. Methods: We...
Three X-ray transients in M31 observed with Swift (2008)
Voss, R., Pietsch, W., Haberl, F., Stiele, H., Greiner, J., Sala, G., ...
The purpose of this study is to find transient X-ray sources in M31, and to investigate and classify their nature. Three X-ray transients were observed with Swift. For each of the three X-ray...
Neutrino-Nucleus Reaction Cross Sections for Light Element Synthesis in Supernova Explosions (2008)
Yoshida, T., Suzuki, T., Chiba, S., Kajino, T., Yokomakura, H., Kimura, K., ...
The neutrino-nucleus reaction cross sections of 4He and 12C are evaluated using new shell model Hamiltonians. Branching ratios of various decay channels are calculated to evaluate the yields of Li,...
Gomboc, A., Kobayashi, S., Guidorzi, C., Melandri, A., Mangano, V., Sbarufatti, B., ...
We present a detailed study of the prompt and afterglow emission from Swift GRB 061126 using BAT, XRT, UVOT data and multi-color optical imaging from ten ground-based telescopes. GRB 061126 was a...
The Robotic Super-LOTIS Telescope: Results & Future Plans (2008)
Williams, G. G., Milne, P. A., Park, H. S., Barthelmy, S. D., Hartmann, D. H., Updike, A., ...
We provide an overview of the robotic Super-LOTIS (Livermore Optical Transient Imaging System) telescope and present results from gamma-ray burst (GRB) afterglow observations using Super-LOTIS and...
Relativistic Particle-In-Cell Simulation Studies of Prompt and Early Afterglows from GRBs (2008)
Hardee, P., Mizuno, Y., Medvedev, M., Zhang, B., Hartmann, D. H., ...
Nonthermal radiation observed from astrophysical systems containing relativistic jets and shocks e.g. gamma-ray bursts (GRBs) active galactic nuclei (AGNs) and microquasars commonly exhibit power-law...
Three X-ray transients in M 31 observed with Swift (Research Note) (2008)
Voss, R., Pietsch, W., Haberl, F., Stiele, H., Greiner, J., Sala, G., ...
A photometric redshift of z = 1.8 (-0.3) (+0.4) for the AGILE GRB 080514B (2008)
Rossi, A., Ferrero, P., Kann, D. A., Klose, S., Schulze, S., ...
Gomboc, A., Kobayashi, S., Guidorzi, C., Melandri, A., Mangano, V., Sbarufatti, B., ...
We present a detailed study of the prompt and afterglow emission from Swift GRB 061126 using BAT, XRT, UVOT data and multicolor optical imaging from 10 ground-based telescopes. GRB 061126 was a long...
The rapidly flaring afterglow of the very bright and energetic GRB 070125 (2008)
Updike, A.C., Haislip, J.B., Nysewander, M.C., Fruchter, A.S., Kann, D.A., Klose, S., ...
We report on multiwavelength observations, ranging from X-ray to radio wave bands, of the IPN-localized gamma-ray burst GRB 070125. Spectroscopic observations reveal the presence of absorption lines...
CGRO/OSSE observations of the Cassiopeia A SNR (2007)
The Leising, J. D. Kurfess, W. N. Johnson, D. H. Hartmann, N. Gehrels, W. R. Purcell
. We present all OSSE observations to date of the Cas A supernova remnant. The objectives are to detect the 44 Ti lines, one of which has been reportedly detected by COMPTEL, and the hard X-ray...
The Angular Distribution of COMPTEL Gamma-Ray Bursts (2007)
Kippen Ryan, J. Ryan, A. Connors, M. Mcconnell, D. H. Hartmann, C. Winkler, ...
NTRODUCTION The isotropic, inhomogeneous distribution of burst sources derived from BATSE data has led to the general acknowledgment that GRBs could be of cosmological origin. If bursts are...
EXIST's Gamma-Ray Burst Sensitivity (2007)
Band, D. L., Grindlay, J. E., Hong, J., Fishman, G., Hartmann, D. H., Garson III, A., ...
We use semi-analytic techniques to evaluate the burst sensitivity of designs for the EXIST hard X-ray survey mission. Applying these techniques to the mission design proposed for the Beyond Einstein...
Possible new optical nova in M 31 (2007)
Burwitz, V., Pietsch, W., Henze, M., Updike, A., Milne, P., Williams, G., ...
Ferrero, P., Sanchez, S.F., Kann, D.A., Klose, S., Greiner, J., Gorosabel, J., ...
Original article can be found at: http://www.iop.org/EJ/journal/aj Copyright American Astronomical Society [Full text of this article is not available in the UHRA]
Ferrero, P., Sanchez, S. F., Kann, D. A., Klose, S., Greiner, J., Gorosabel, J., ...
We report early follow-up observations of the error box of the short burst 050813 using the telescopes at Calar Alto and at Observatorio Sierra Nevada (OSN), followed by deep VLT/FORS2 I-band...
Neutrino Oscillation Effects on Supernova Light Element Synthesis (2006)
Yoshida, T., Kajino, T., Yokomakura, H., Kimura, K., Takamura, A., Hartmann, D. H.
Neutrino oscillations affect light element synthesis through the neutrino-process in supernova explosions. The 7Li and 11B yields produced in a supernova explosion of a 16.2 solar-mass star model...
Probing cosmic chemical evolution with gamma-ray bursts: GRB 060206 at z=4.048 (2006)
Fynbo, J. P. U., Starling, R. L. C., Ledoux, C., Wiersema, K., Thöne, C. C., Sollerman, J., ...
Aims. We present early optical spectroscopy of the afterglow of the gamma-ray burst GRB060206 with the aim of determining the metallicity of the GRB absorber and the physical conditions in the...
The GRB 060218/SN 2006aj event in the context of other Gamma-Ray Burst Supernovae (2006)
Ferrero, P., Kann, D. A., Zeh, A., Klose, S., Pian, E., Palazzi, E., ...
The supernova SN 2006aj associated with GRB 060218 is the second-closest GRB-SN observed to date (z=0.033). We present Very Large Telescope, Liverpool Telescope, and Katzman Automatic Imaging...
A photometric redshift of z = 6.39 0.12 for GRB 050904 (2006)
Haislip, J.B., Nysewander, M.C., Reichart, D., Levan, A., Tanvir, N., Cenko, S.B., ...
Probing Cosmic Chemical Evolution with Gamma-Ray Bursts: GRB060206 at z=4.048 (2006)
Fynbo, J. P. U., Starling, R. L. C., Ledoux, C., Wiersema, K., Thöne, C. C., Sollerman, J., ...
Aim: We present early optical spectroscopy of the afterglow of the gamma-ray burst GRB 060206 with the aim of determining the metallicity of the GRB absorber and the physical conditions in the...
Supernova Neutrino Nucleosynthesis of Light Elements with Neutrino Oscillations (2006)
Yoshida, T., Kajino, T., Yokomakura, H., Kimura, K., Takamura, A., Hartmann, D. H.
Light element synthesis in supernovae through neutrino-nucleus interactions, i.e., the nu-process, is affected by neutrino oscillations in the supernova environment. There is a resonance of 13-mixing...
Are Ti44-Producing Supernovae Exceptional? (2006)
Clayton, D. D., Diehl, R., Hartmann, D. H., Iyudin, A. F., Leising, M. D., ...
According to standard models supernovae produce radioactive $^{44}$Ti, which should be visible in gamma-rays following decay to $^{44}$Ca for a few centuries. $^{44}Ti production is believed to be...
Are ⁴⁴Ti-producing supernovae exceptional? (2006)
Clayton, D. D., Diehl, R., Hartmann, D. H., Iyudin, A. F., Leising, M. D., ...
The GRB 060218/SN 2006aj event in the context of other gamma-ray burst supernovae (2006)
Ferrero, P., Kann, D. A., Zeh, A., Klose, S., Pian, E., Palazzi, E., ...
The GRB 060218/SN 2006aj event in the context of other gamma-ray burst supernovae (2006)
Ferrero, P., Kann, D. A., Zeh, A., Klose, S., Pian, E., Palazzi, E., ...
The MEGA project for medium energy gamma-ray astronomy (2006)
Bloser, P. F., Ryan, J. M., McConnell, M. L., Macri, J. R., Bravar, U., Kanbach, G., ...
The GRB 060218/SN 2006aj event in the context of other gamma-ray burst supernovae. (2006)
Ferrero, P., Kann, D.A., Zeh, A., Klose, S., Pian, E., Palazzi, E., ...
Probing cosmic chemical evolution with gamma-ray bursts: GRB 060206 at z = 4.048. (2006)
Fynbo, J., Starling, R.L., Ledoux, C., Wiersema, K., Thoene, C.C., Sollerman, J., ...
GRB 060714: OA redshift (2006)
Jakobsson, P., Vreeswijk, P., Fynbo, J.P.U., Hjorth, J., Starling, R., Kann, D.A., ...
Not Available
A photometric redshift of z = 6.39 ¿ 0.12 for GRB 050904 (2006)
Haislip, J.B., Nysewander, M.C., Reichart, D.E., Levan, A.J., Tanvir, N., Cenko, S.B., ...
Gamma-ray bursts (GRBs) and their afterglows are the most brilliant transient events in the Universe. Both the bursts themselves and their afterglows have been predicted to be visible out to...
Nysewander, M. C., Reichart, D. E., Williams, G. G., Kinugasa, K., Lamb, D. Q., ...
We present Follow-Up Network for Gamma-Ray Bursts (FUN GRB) Collaboration observations of the optical afterglow of GRB 021211 made between 143 seconds and 102 days after the burst. Our unique data...
Evidence for Supernova light in all Gamma-Ray Burst afterglows (2005)
Zeh, A., Klose, S., Hartmann, D. H.
We present an update of our systematic analysis of all Gamma-Ray Burst (GRB) afterglow data, now published through the end of 2004, in an attempt to detect the predicted supernova light component. We...
INTEGRAL SPI limits on electron-positron annihilation radiation from the galactic plane (2005)
Teegarden, B. J., Watanabe, K., Jean, P., Knödlseder, J., Lonjou, V., Roques, J. P., ...
MEGA: a medium-energy gamma-ray astronomy mission concept (2005)
Bloser, P. F., Ryan, J. M., McConnell, M. L., Macri, J. R., Bravar, U., Kanbach, G., ...
GRB 040403: a faint X-ray rich Gamma-ray Burst discovered by INTEGRAL (2004)
Mereghetti, S., Gotz, D., Andersen, M. I., Castro-Tirado, A., Frontera, F., Gorosabel, J., ...
GRB 040403 is one of the faintest gamma-ray bursts for which a rapid and accurate localization has been obtained. Here we report on the gamma-ray properties of this burst, based on observations with...
INTEGRAL/SPI Limits on Electron-Positron Annihilation Radiation from the Galactic Plane (2004)
Teegarden, B. J., Watanabe, K., Jean, P., Knodlseder, J., Lonjou, V., Roques, J. P., ...
The center of our Galaxy is a known strong source of electron-positron 511-keV annihilation radiation. Thus far, however, there have been no reliable detections of annihilation radiation outside of...
Observing GRBs with EXIST (2004)
Hartmann, D. H., Grindlay, J., Hong, J., Loeb, A., Blandford, R., Craig, W., ...
We describe the Energetic X-ray Imaging Survey Telescope EXIST, designed to carry out a sensitive all-sky survey in the 10 keV – 600 keV band. The primary goal of EXIST is to find black holes in...
Discovery of the Near-IR Afterglow and of the Host of GRB 030528 (2004)
Rau, A., Greiner, J., Klose, S., Salvato, M., Cerón, J. M. Castro, Hartmann, D. H., ...
The rapid dissemination of an arcmin-sized HETE-2 localization of the long-duration X-ray flash GRB 030528 led to a ground-based multi-observatory follow-up campaign. We report the discovery of the...
Klose, S., Greiner, J., Rau, A., Henden, A. A., Hartmann, D. H., Zeh, A., ...
We report results from a comprehensive follow-up observing campaign of the afterglow of GRB 030226, including VLT spectroscopy, VLT polarimetry, and Chandra X-ray observations. In addition, we...
A near-infrared survey of the N49 region around the Soft Gamma-Ray Repeater 0526-66 (2004)
Klose, S., Henden, A. A., Geppert, U., Greiner, J., Guetter, H. H., Hartmann, D. H., ...
We report the results of a deep near-infrared survey with VLT/ISAAC of the environment of the supernova remnant N49 in the Large Magellanic Cloud, which contains the soft gamma-ray repeater SGR...
Klose, S., Palazzi, E., Masetti, N., Stecklum, B., Greiner, J., Hartmann, D. H., ...
We explore the prospects for simultaneous, broad-band, multiwavelength polarimetric observations of GRB afterglows. We focus on the role of cosmic dust in GRB host galaxies on the observed percentage...
Vreeswijk, P. M., Ellison, S. L., Ledoux, C., Fynbo, J. P. U., Møller, P., ...
We present photometry and spectroscopy of the afterglow of GRB 030323. VLT spectra of the afterglow show damped Lya (DLA) absorption and low- and high-ionization lines at a redshift z=3.3718+-0.0005....
The Optical Afterglow of GRB 030226 (2004)
Klose, S., Greiner, J., Zeh, A., Rau, A., Henden, A.A., Hartmann, D.H., ...
Klose, S., Greiner, J., Rau, A., Henden, A.A., Hartmann, D.H., Zeh, A., ...
Discovery of the near-IR afterglow and of the host of GRB 030528 (2004)
Rau, A., Greiner, J., Klose, S., Salvato, M., Castro Ceron, J.M., Hartmann, D.H., ...
The Polarization Evolution of the Optical Afterglow of GRB 030329 (2004)
Greiner, J., Klose, S., Reinsch, K., Schmid, H.M., Sari, R., Hartmann, D.H., ...
Not Available
The dark side of GRB 020819 (2004)
Klose, S., Stecklum, B., Henden, A. A., Greiner, J., Hartmann, D. H., Cardiel, N., ...
The afterglow light curve and the supernova of GRB 011121 (2004)
Zeh, A., Klose, S., Greiner, J., Hartmann, D. H., Lindsay, K., Castro-Tirado, A. J., ...
GRB 011121: Jet, wind and supernova – all in one (2004)
Greiner, J., Klose, S., Salvato, M., Zeh, A., Schwarz, R., Hartmann, D. H., ...
A near-infrared survey of the N49 region around the soft gamma repeater SGR 0526-66 (2004)
Klose, S., Henden, A. A., Geppert, U., Greiner, J., Guetter, H. H., Hartmann, D. H., ...
MEGA: the next generation medium energy gamma-ray telescope (2004)
Ryan, J. M., Andritschke, R., Bloser, P., Cravens, J., Cherry, M., DiCocco, G., ...
The polarization evolution of the optical afterglow of GRB 030329 (2004)
Greiner, J., Klose, S., Reinsch, K., Schmid, H. M., Sari, R., Hartmann, D. H., ...
The optical afterglow of GRB 030226 (2004)
Klose, S., Greiner, J., Zeh, A., Rau, A., Henden, A. A., Hartmann, D. H., ...
Discovery of the near-IR afterglow and of the host of GRB 030528 (2004)
Rau, A., Greiner, J., Klose, S., Salvato, M., Castro Cerón, J. M., Hartmann, D. H., ...
The polarization evolution of the optical afterglow of GRB 030329 (2003)
Greiner, J., Klose, S., Reinsch, K., Schmid, H. M., Sari, R., Hartmann, D. H., ...
We report 31 polarimetric observations of the afterglow of GRB 030329 with high signal-to-noise and high sampling frequency. The data imply that the afterglow magnetic field has small coherence...
A Systematic Analysis of Supernova Light in Gamma-Ray Burst Afterglows (2003)
Zeh, A., Klose, S., Hartmann, D. H.
We systematically reanalyzed all Gamma-Ray Burst (GRB) afterglow data published through the end of 2002, in an attempt to detect the predicted supernova light component and to gain statistical...
Evolution of the polarization of the optical afterglow of the gamma-ray burst GRB 030329 (2003)
Greiner, J., Klose, S., Reinsch, K., Schmid, H. M., Sari, R., Hartmann, D. H., ...
We report 31 polarimetric observations of the afterglow of GRB 030329 with high signal-to-noise and high sampling frequency. We establish the polarization light curve, detect sustained polarization...
Line shape diagnostics of Galactic 26Al (2003)
Kretschmer, K., Diehl, R., Hartmann, D. H.
The shape of the gamma-ray line from radioactive 26Al, at 1808.7 keV energy in the frame of the decaying isotope, is determined by its kinematics when it decays, typically 10^6 y after its ejection...
GRB 011121: A collimated outflow into wind-blown surroundings (2003)
Greiner, J., Klose, S., Salvato, M., Zeh, A., Schwarz, R., Hartmann, D. H., ...
We discover a break in the GRB 011121 afterglow light curve after 1.3 days, which implies an initial jet opening angle of about 9 deg. The SED during the first four days is achromatic, and supports...
Implications of Cosmological Gamma-Ray Absorption II. Modification of gamma-ray spectra (2003)
Kneiske, T. M., Bretz, T., Mannheim, K., Hartmann, D. H.
Bearing on the model for the time-dependent metagalactic radiation field developed in the first paper of this series, we compute the gamma-ray attenuation due to pair production in photon-photon...
Observation of GRB 030131 with the INTEGRAL satellite (2003)
Gotz, D., Mereghetti, S., Hurley, K., Deluit, S., Feroci, M., Frontera, F., ...
A long Gamma-Ray Burst (GRB) was detected with the instruments on board the INTEGRAL satellite on January 31 2003. Although most of the GRB, which lasted $\sim$150 seconds, occurred during a...
Constraining the Cosmic Star Formation Rate with the MeV Background (2003)
Watanabe, K., Hartmann, D. H., Leising, M. D.
The Cosmic Gamma-ray Background (CGB) in the MeV regime has been measured with COMPTEL and SMM. The origin of the CGB in this energy regime is believed to be dominated by gamma-rays from Type Ia...
GRB 011121: A Collimated Outflow into Wind-blown Surroundings (2003)
Greiner, J., Klose, S., Salvato, M., Zeh, A., Schwarz, R., Hartmann, D.H., ...
Evolution of the polarization of the optical afterglow of the gamma-ray burst GRB030329 (2003)
Greiner, J., Klose, S., Reinsch, K., Martin Schmid, H., Sari, R., Hartmann, D.H., ...
The association of a supernova with GRB030329 strongly supports the `collapsar' model of gamma-ray bursts, where a relativistic jet forms after the progenitor star collapses. Such jets cannot be...
GRB 011121: A Collimated Outflow into Wind-blown Surroundings (2003)
Greiner, J., Klose, S., Salvato, M., Zeh, A., Schwartz, R., Hartmann, D.H., ...
We report optical and near-infrared follow-up observations of GRB 011121 collected predominantly at ESO telescopes in Chile. We discover a break in the afterglow light curve after 1.3 days, which...
GRB 011121 : a collimated outflow into wind-blown surroundings (2003)
Greiner, J., Klose, S., Salvato, M., Zeh, A., Schwarz, R., Hartmann, D. H., ...
How Massive Single Stars End their Life (2002)
Heger, A., Fryer, C. L., Woosley, S. E., Langer, N., Hartmann, D. H.
How massive stars die -- what sort of explosion and remnant each produces -- depends chiefly on the masses of their helium cores and hydrogen envelopes at death. For single stars, stellar winds are...
Proposed Next Generation GRB Mission: EXIST (2002)
Grindlay, J., Gehrels, N., Harrison, F., Blandford, R., Fishman, G., Kouveliotou, C., ...
A next generation Gamma Ray Burst (GRB) mission to follow the upcoming Swift mission is described. The proposed Energetic X-ray Imaging Survey Telescope, EXIST, would yield the limiting (practical)...
Disturbance Ecology from nearby Supernovae (2002)
Hartmann, D. H., Kretschmer, K., Diehl, R.
Monte Carlo simulations of Galactic Supernovae are carried out to study the rate of nearby events, which may have a direct effect on Earth's ecology though ionizing radiation and cosmic ray...
Gamma-Ray Bursts and Cosmic Radiation Backgrounds (2002)
Hartmann, D. H., Kneiske, T. M., Mannheim, K., Watanabe, K.
GRBs contribute to the evolving cosmic radiation field. We discuss the contribution of GRBs to the high-energy background, and the effect of pair creation off low-energy photons on their observable...
Mid-infrared observations of the SGR 1900+14 error box (2002)
Klose, S., Stecklum, B., Hartmann, D. H., Vrba, F. J., Henden, A. A., Bacmann, A.
We report on mid-infrared observations of the compact stellar cluster located in the proximity of SGR 1900+14, and the radio/X-ray position of this soft-gamma repeater. Observations were performed in...
The bright optical afterglow of the long GRB 001007 (2002)
Castro Ceron, J.M., Castro-Tirado, A.J., Gorosabel, J., Hjorth, J., Fynbo, J.U., Jensen, B.L., ...
We present optical follow up observations of the long GRB 001007 between 6.14 hours and ~468 days after the event. An unusually bright optical afterglow (OA) was seen to decline following a steep...
Understanding 26Al emission from Cygnus (2002)
Plüschke, S., Cerviño, M., Diehl, R., Kretschmer, K., Hartmann, D. H., Knödlseder, J.
LOTIS, Super-LOTIS, SDSS and Tautenburg Observations of GRB 010921 (2001)
Park, H. S., Williams, G. G., Hartmann, D. H., Lamb, D. Q., Lee, B. C., Tucker, D. L., ...
We present multi-instrument optical observations of the High Energy Transient Explorer (HETE-2)/Interplanetary Network (IPN) error box of GRB 010921. This event was the first gamma ray burst (GRB)...
The bright optical afterglow of the long GRB 001007 (2001)
Cerón, J. M. Castro, Castro-Tirado, A. J., Gorosabel, J., Hjorth, J., Fynbo, J. U., Jensen, B. L., ...
We present optical follow up observations of the long GRB 001007 between 6.14 hours and ~468 days after the event. An unusually bright optical afterglow (OA) was seen to decline following a steep...
Diffuse gamma-ray line emission from multiple OB Associations in Cygnus (2001)
Plueschke, S., Cervino, M., Diehl, R., Kretschmer, K., Hartmann, D. H., Knoedlseder, J.
The COMPTEL observations of the diffuse galactic 1.809 MeV emission attributed to the radioactive decay of 26Al have confirmed the diffuse nature of this interstellar emission line. One of the most...
Afterglow upper limits for four short duration, hard spectrum gamma-ray bursts (2001)
Hurley, K., Berger, E., Castro-Tirado, A., Cerón, J. M. Castro, Cline, T., Feroci, M., ...
We present interplanetary network localization, spectral, and time history information for four short-duration, hard spectrum gamma-ray bursts, GRB000607, 001025B, 001204, and 010119. All of these...
Gamma-Ray Line Emission from Superbubbles in the Interstellar Medium: The Cygnus Region (2001)
Plueschke, S., Diehl, R., Kretschmer, K., Hartmann, D. H., Oberlack, U.
The star forming process in the Milky Way is non-uniform in time and space. The scale of star forming regions ranges from groups within a few pc to large segments of spiral arms with linear dimension...
Contributions of GRBs and Cen A-like Radio Galaxies to the Cosmic Gamma-ray Background (2001)
The contribution to the cosmic diffuse gamma-ray background (CGB) from Gamma Ray Bursts (GRBs) is studied in the 40 keV - 2 MeV regime. We use High Energy Resolution (HER) data from the Burst And...
The Cygnus Region: 26Al from OB Associations (2001)
Plueschke, S., Kretschmer, K., Diehl, R., Hartmann, D. H., Oberlack, U.
The COMPTEL map of the 1.809 MeV gamma-ray line, which is attributed to the radioactive decay of 26Al, shows significant excess emission in the Cygnus region. Cygnus is a region of recent star...
Radioactivities in Population Studies: 26Al and 60Fe from OB Associations (2001)
Plueschke, S., Diehl, R., Kretschmer, K., Hartmann, D. H., Oberlack, U.
The observation of the interstellar 1.809 MeV decay-line of radioactive 26Al by the imaging gamma-ray telescope COMPTEL have let to the conclusion, that massive stars and their subsequent...
Klose, S., Stecklum, B., Masetti, N., Pian, E., Palazzi, E., Henden, A. A., ...
We report near-infrared and optical follow-up observations of the afterglow of the Gamma-Ray Burst 000418 starting 2.5 days after the occurrence of the burst and extending over nearly seven weeks....
Modelling Radioactivities and other Observables from OB Associations (2000)
Plueschke, S., Diehl, R., Hartmann, D. H., Oberlack, U. G.
Recent observations of the diffuse Galactic gamma-ray glow at 1.809 MeV, attributed to the radioactive decay of 26Al, point towards a massive star origin of this radioactive isotope. Wolf Rayet stars...
LOTIS Upper Limits and the Prompt OT from GRB 990123 (1999)
Williams, G. G., Hartmann, D. H., Park, H. S., Porrata, R. A., Ables, E., Bionta, R., ...
GRB 990123 established the existence of prompt optical emission from gamma-ray bursts (GRBs). The Livermore Optical Transient Imaging System (LOTIS) has been conducting a fully automated search for...
Search for X-ray Afterglows from Gamma-Ray Bursts in the RASS (1999)
Greiner, J., Hartmann, D. H., Voges, W., Boller, Th., Schwarz, R., Zharykov, S.
We report on a search for X-ray afterglows from gamma-ray bursts using the ROSAT all-sky survey (RASS) data. If the emission in the soft X-ray band is significantly less beamed than in the gamma-ray...
Search for GRB X-ray afterglows in the ROSAT all-sky survey (1999)
Greiner, J., Hartmann, D. H., Voges, W., Boller, Th., Schwarz, R., Zharikov, S.
We describe a search for X-ray afterglows from gamma-ray bursts using the ROSAT all-sky survey (RASS) data. If the emission in the soft X-ray band is significantly less beamed than in the gamma-ray...
Formation Rates of Black Hole Accretion Disk Gamma-Ray Bursts (1999)
Fryer, C. L., Woosley, S. E., Hartmann, D. H.
While many models have been proposed for GRBs, those currently favored are all based upon the formation of and/or rapid accretion into stellar mass black holes. We present population synthesis...
LOTIS Search for Early Time Optical Afterglows: GRB 971227 (1999)
Williams, G. G., Park, H. S., Ables, E., Band, D. L., Barthelmy, S. D., Bionta, R., ...
We report on the very early time search for an optical afterglow from GRB 971227 with the Livermore Optical Transient Imaging System (LOTIS). LOTIS began imaging the `Original' BATSE error box of GRB...
Hurley, K., Hartmann, D. H., Kouveliotou, C., Kippen, R. M., Laros, J., Cline, T., ...
We examine the recent claims that cosmic gamma-ray bursts are associated with either radio-quiet quasars or Abell clusters. These associations were based on positional coincidences between cataloged...
The Diffuse Gamma-Ray Background from Supernovae (1998)
Watanabe, K., Hartmann, D. H., Leising, M. D.
The Cosmic Gamma-ray Background (CGB) in the MeV region is believed to be due to photons from radioactivity produced in SNe throughout the history of galaxies in the universe. In particular,...
Band, D. L., Hartmann, D. H., Schaefer, B. E.
With the discovery that the afterglows after some bursts are coincident with faint galaxies, the search for host galaxies is no longer a test of whether bursts are cosmological, but rather a test of...
On the Association of Gamma-Ray Bursts with Supernovae (1998)
Kippen, R. M., Briggs, M. S., Kommers, J. M., Kouveliotou, C., Hurley, K., Robinson, C. R., ...
The recent discovery of a supernova (SN 1998bw) seemingly associated with GRB~980425 adds a new twist to the decades-old debate over the origin of gamma-ray bursts. To investigate the possibility...
Evidence for a Galactic gamma ray halo (1998)
Dixon, D. D., Hartmann, D. H., Kolaczyk, E. D., Samimi, J., Diehl, R., Kanbach, G., ...
We present quantitative statistical evidence for a $\gamma$-ray emission halo surrounding the Galaxy. Maps of the emission are derived. EGRET data were analyzed in a wavelet-based non-parametric...
Lifetime of `4`4Ti as probe for supernova models. (1998)
Görres, J., Meissner, J., Schatz, H., Stech, E., Tischhauser, P., Wiescher, M., ...
Buballa, M. et al. [Hrsg.]
First Year Results From LOTIS (1997)
Williams, G. G., Park, H. S., Ables, E., Band, D. L., Barthelmy, S. D., Bionta, R., ...
LOTIS (Livermore Optical Transient Imaging System) is a gamma-ray burst optical counterpart search experiment located near Lawrence Livermore National Laboratory in California. The system is linked...
Evidence for GeV emission from the Galactic Center Fountain (1997)
Hartmann, D. H., Dixon, D. D., Kolaczyk, E. D., Samimi, J.
The region near the Galactic center may have experienced recurrent episodes of injection of energy in excess of $\sim$ 10$^{55}$ ergs due to repeated starbursts involving more than $\sim$ 10$^4$...
Hard X-ray Emission from Cassiopeia A SNR (1997)
Leising, M. D., Hartmann, D. H., Kurfess, J. D., Blanco, P., Bhattacharya, D.
We report the results of extracting the hard X-ray continuum spectrum of Cas A SNR from RXTE/PCA Target of Opportunity (TOO) observations and CGRO/OSSE observations. The data can rule out the single...
Timmes, F. X., Diehl, R., Hartmann, D. H.
Gamma-rays from the decay of $^{26}$Al offer a stringent constraint on the Galaxy's global star formation rate over the past million years, supplementing other methods for quantifying the recent...
The Production of Ti44 and Co60 in Supernova (1995)
Timmes, F. X., Woosley, S. E., Hartmann, D. H., Hoffman, R. D.
The production of the radioactive isotopes $^{44}$Ti and $^{60}$Co in all types of supernovae is examined and compared to observational constraints including Galactic $\gamma$--ray surveys,...
26Al and 60Fe From Supernova Explosions (1995)
Timmes, F. X., Woosley, S. E., Hartmann, D. H., Hoffman, R. D., Weaver, T. A., Matteucci, F.
Using recently calculated yields for Type II supernovae, along with models for chemical evolution and the distribution of mass in the interstellar medium, the current abundances and spatial...