An Unusually Fast-Evolving Supernova (2009)
Poznanski, Dovi, Chornock, Ryan, Nugent, Peter E., Bloom, Joshua S., Ganeshalingam, Mohan, Leonard, Douglas C., ...
Analyses of supernovae (SNe) have revealed two main types of progenitors: exploding white dwarfs and collapsing massive stars. We present SN2002bj, which stands out as different from any SN reported...
The Cosmic Rate, Luminosity Function and Intrinsic Correlations of Long GRBs (2009)
Butler, Nathaniel R., Bloom, Joshua S., Poznanski, Dovi
We calculate durations and spectral parameters for 207 Swift bursts detected by the BAT instrument from April 2007 to August 2009, including 67 events with measured redshifts. This is the first...
Smith, Nathan, Miller, Adam A., Li, Weidong, Filippenko, Alexei V., Silverman, Jeffrey M., Howard, Andrew W., ...
We present progenitor star detections, light curves, and spectra of SN 2009ip and the 2009 optical transient in UGC 2773 (U2773-OT), which were not genuine supernovae (SNe). In particular, precursor...
Kocevski, Daniel, Thone, Christina C, Ramirez-Ruiz, Enrico, Bloom, Joshua S., Granot, Jonathan, Butler, Nathaniel R., ...
We present results of an extensive observing campaign of the short duration, hard spectrum gamma-ray burst (GRB) 070724A, aimed at detecting the radioactively-powered emission that might follow from...
GRB 090426: The Environment of a Rest-Frame 0.35-second Gamma-Ray Burst at Redshift z=2.609 (2009)
Levesque, Emily M., Bloom, Joshua S., Butler, Nathaniel R., Perley, Daniel A., Cenko, S. Bradley, Prochaska, J. Xavier, ...
We present the discovery of an absorption-line redshift of z = 2.609 for GRB 090426, establishing the first firm lower limit to a redshift for a gamma-ray burst with an observed duration of 90%...
Exploring the Optical Transient Sky with the Palomar Transient Factory (2009)
Rau, Arne, Kulkarni, Shrinivas R., Law, Nicholas M., Bloom, Joshua S., Ciardi, David, Djorgovski, George S., ...
The Palomar Transient Factory (PTF) is a wide-field experiment designed to investigate the optical transient and variable sky on time scales from minutes to years. PTF uses the CFH12k mosaic camera,...
Irwin, Jonathan, Charbonneau, David, Berta, Zachory K., Quinn, Samuel N., Latham, David W., Torres, Guillermo, ...
We report the detection of eclipses in GJ 3236, a bright (I = 11.6) very low mass binary system with an orbital period of 0.77 days. Analysis of light- and radial velocity curves of the system...
Tejos, Nicolas, Lopez, Sebastian, Prochaska, J. Xavier, Bloom, Joshua S., Chen, Hsiao-Wen, Dessauges-Zavadsky, Miroslava, ...
We revisit echelle spectra (spectral resolution R ~ 40000) of 8 Gamma-Ray Burst afterglows to obtain the incidence (dN/dz) of weak intervening Mg II systems at a mean redshift of = 1.5. We show that...
The Synoptic All-Sky Infrared (SASIR) Survey (2009)
Bloom, Joshua S., Prochaska, J. Xavier, Lee, William, González, J. Jesús, Ramírez-Ruiz, Enrico, Bolte, Michael, ...
We are proposing to conduct a multicolor, synoptic infrared (IR) imaging survey of the Northern sky with a new, dedicated 6.5-meter telescope at San Pedro M\'artir (SPM) Observatory. This initiative...
Bloom, Joshua S, Khan, Zia, Kruglyak, Leonid, Singh, Mona, Caudy, Amy A
Abstract Background High-throughput cDNA synthesis and sequencing of poly(A)-enriched RNA is rapidly emerging as a technology competing to replace microarrays as a quantitative platform for measuring...
Probing Quiescent Massive Black Holes: Insights from Tidal Disruption Events (2009)
Gezari, Suvi, Strubbe, Linda, Bloom, Joshua S., Grindlay, J. E., Soderberg, Alicia, Elvis, Martin, ...
Tidal disruption events provide a unique probe of quiescent black holes in the nuclei of distant galaxies. The next generation of synoptic surveys will yield a large sample of flares from the tidal...
The Dynamic X-ray Sky of the Local Universe (2009)
Soderberg, Alicia M., Grindlay, Jonathan E., Bloom, Joshua S., Gezari, Suvi, Piro, Anthony L., Belloni, Tomaso, ...
Over the next decade, we can expect time domain astronomy to flourish at optical and radio wavelengths. In parallel with these efforts, a dedicated transient "machine" operating at higher energies...
The Impact of the Astro2010 Recommendations on Variable Star Science (2009)
Walkowicz, Lucianne M., Becker, Andrew C., Anderson, Scott F., Bloom, Joshua S., Georgiev, Leonid, Grindlay, Josh, ...
The next decade of survey astronomy has the potential to transform our knowledge of variable stars. Stellar variability underpins our knowledge of the cosmological distance ladder, and provides...
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...
Type II Supernovae as Probes of Cosmology (2009)
Poznanski, Dovi, Baron, Eddie, Blondin, Stephane, Bloom, Joshua S., D'Andrea, Christopher B., Della Valle, Massimo, ...
- Constraining the cosmological parameters and understanding Dark Energy have tremendous implications for the nature of the Universe and its physical laws. - The pervasive limit of systematic...
Bloom, Joshua S., Holz, Daniel E., Hughes, Scott A., Menou, Kristen, Adams, Allan, Anderson, Scott F., ...
It is widely expected that the coming decade will witness the first direct detection of gravitational waves (GWs). The ground-based LIGO and Virgo GW observatories are being upgraded to advanced...
Khan, Zia, Bloom, Joshua S., Kruglyak, Leonid, Singh, Mona
Motivation: High-throughput sequencing technologies place ever increasing demands on existing algorithms for sequence analysis. Algorithms for computing maximal exact matches (MEMs) between sequences...
Improved Standardization of Type II-P Supernovae: Application to an Expanded Sample (2008)
Poznanski, Dovi, Butler, Nathaniel, Filippenko, Alexei V., Ganeshalingam, Mohan, Li, Weidong, Bloom, Joshua S., ...
In the epoch of precise and accurate cosmology, cross-confirmation using a variety of cosmographic methods is paramount to circumvent systematic uncertainties. Owing to progenitor histories and...
Blake, Cullen H., Bloom, Joshua S., Latham, David W., Szentgyorgyi, Andrew H., Skrutskie, Michael F., Falco, Emilio E., ...
Stars of late-M and L spectral types, collectively known as Ultracool Dwarfs (UCDs), may be excellent targets for searches for extrasolar planets. Owing to their small radii, the signal from an...
Resolving The ISM Surrounding GRBs with Afterglow Spectroscopy (2008)
Prochaska, Jason X., Chen, Hsiao-Wen, Dessauges-Zavadsky, Miroslava, Bloom, Joshua S.
We review current research related to spectroscopy of gamma-ray burst (GRB) afterglows with particular emphasis on the interstellar medium (ISM) of the galaxies hosting these high redshift events....
Gamma-ray Bursts, Classified Physically (2008)
Bloom, Joshua S., Butler, Nathaniel R., Perley, Daniel A.
From Galactic binary sources, to extragalactic magnetized neutron stars, to long-duration GRBs without associated supernovae, the types of sources we now believe capable of producing bursts of...
Generalized Tests for Selection Effects in GRB High-Energy Correlations (2008)
Butler, Nathaniel R., Kocevski, Daniel, Bloom, Joshua S.
Several correlations among parameters derived from modelling the high-energy properties of GRBs have been reported. We show that well-known examples of these have common features indicative of strong...
Late-time observations of SN2006gy: Still Going Strong (2008)
Smith, Nathan, Foley, Ryan J., Bloom, Joshua S., Li, Weidong, Filippenko, Alexei V., Gavazzi, Raphael, ...
Owing to its extremely high luminosity and long duration, SN2006gy radiated more energy in visual light than any other known SN. Two hypotheses to explain its high luminosity -- that it was powered...
Unraveling the dynamics and kinematics of GRB hosts with high resolution spectroscopy (2008)
Thoene, Christina C., Fynbo, Johan P. U., Christensen, Lise, Wiersema, Klaas, Bloom, Joshua S.
In the last years the research on GRB host galaxies has proceeded to more detailed studies both using high resolution afterglow spectroscopy and spatially resolved spectra of nearby hosts. High...
Hypernova Signatures in the Late Rebrightening of GRB 050525A (2007)
Della Valle, Massimo, Malesani, Daniele, Bloom, Joshua S., Benetti, Stefano, Chincarini, Guido, D'Avanzo, Paolo, ...
We report observations of GRB 050525A, for which a Gemini North spectrum shows its redshift to be z = 0.606. This is the third closest long GRB discovered by Swift. We observed its afterglow using...
Type Ia Supernovae are Good Standard Candles in the Near Infrared: Evidence from PAIRITEL (2007)
Wood-Vasey, W. Michael, Friedman, Andrew S., Bloom, Joshua S., Hicken, Malcolm, Modjaz, Maryam, Kirshner, Robert P., ...
We have obtained 1087 NIR (JHKs) measurements of 21 SNe Ia using PAIRITEL, nearly doubling the number of well-sampled NIR SN Ia light curves. These data strengthen the evidence that SNe Ia are...
A New Low-Mass Eclipsing Binary from SDSS-II (2007)
Blake, Cullen H., Torres, Guillermo, Bloom, Joshua S., Gaudi, B. Scott
We present observations of a new low-mass double-lined eclipsing binary system discovered using repeat observations of the celestial equator from the Sloan Digital Sky Survey II. Using near-infrared...
Chen, Hsiao-Wen, Prochaska, J. X., Bloom, Joshua S.
Recent observations suggest that global properties of the host galaxies for long-duration gamma-ray bursts (GRBs) are particularly well-suited for creating the massive star progenitors of these GRBs....
Butler, Nathaniel R., Kocevski, Daniel, Bloom, Joshua S., Curtis, Jason L.
We calculate durations and spectral paramaters for 218 Swift bursts detected by the BAT instrument between and including GRBs 041220 and 070509, including 77 events with measured redshifts....
SubmilliJansky Transients in Archival Radio Observations (2007)
Bower, Geoffrey C., Saul, Destry, Bloom, Joshua S., Bolatto, Alberto, Filippenko, Alexei V., Foley, Ryan J., ...
[ABRIDGED] We report the results of a 944-epoch survey for transient sources with archival data from the Very Large Array spanning 22 years with a typical epoch separation of 7 days. Observations...
On the Nature of Velocity Fields in High z Galaxies (2007)
Prochaska, Jason X., Chen, Hsiao-Wen, Wolfe, Arthur M., Dessauges-Zavadsky, Miroslava, Bloom, Joshua S.
We analyze the gas kinematics of damped Lya systems (DLAs) hosting high z gamma-ray bursts (GRBs) and those toward quasars (QSO-DLAs) focusing on threestatistics: (1) dv, the velocity interval...
Prochaska, Jason X., Chen, Hsiao-Wen, Dessauges-Zavadsky, Miroslava, Bloom, Joshua S.
We study the chemical abundances of the interstellar medium surrounding high z gamma-ray bursts (GRBs) through analysis of the damped Lya systems (DLAs) identified in afterglow spectra. These...
Missing Molecular Hydrogen and the Physical Conditions of GRB Host Galaxies (2007)
Tumlinson, Jason, Prochaska, Jason X., Chen, Hsiao-Wen, Dessauges-Zavadsky, Miroslava, Bloom, Joshua S.
We examine the abundance of molecular hydrogen (H2) in the spectra of gamma ray burst afterglows (GRBs). In nearby galaxies H2 traces the cold neutral medium (CNM) and dense molecular star-forming...
Discovery of a Very Bright, Nearby Gravitational Microlensing Event (2007)
Gaudi, B. Scott, Patterson, Joseph, Spiegel, David S., Krajci, Thomas, Koff, R., Pojmanski, G., ...
We report the serendipitous detection of a very bright, very nearby microlensing event. In late October 2006, an otherwise unremarkable A0 star at a distance ~1 kpc (GSC 3656-1328) brightened...
Keck and ESO-VLT View of the Symmetry of the Ejecta of the XRF/SN 2006aj (2007)
Mazzali, Paolo A., Foley, Ryan J., Deng, Jinsong, Patat, Ferdinando, Pian, Elena, Baade, Dietrich, ...
Nebular-phase spectra of SN 2006aj, which was discovered in coincidence with X-ray flash 060218, were obtained with Keck in 2006 July and the Very Large Telescope in 2006 September. At the latter...
Pulse Width Evolution of Late Time X-rays Flares in GRBs: Evidence For Internal Shocks (2007)
Kocevski, Daniel, Butler, Nathaniel, Bloom, Joshua S.
We study the duration and variability of late time X-ray flares following gamma-ray bursts (GRBs) observed by the narrow field X-ray telescope (XRT) aboard the {\it Swift} spacecraft. These flares...
Mazzali, Paolo A., Foley, Ryan J., Deng, Jinsong, Patat, Ferdinando, Pian, Elena, Baade, Dietrich, ...
Kocevski, Daniel, Modjaz, Maryam, Bloom, Joshua S., Foley, Ryan, Starr, Daniel, Blake, Cullen H., ...
We report simultaneous multicolor near-infrared (NIR) observations of the supernova associated with x-ray Flash 060218 during the first 16 days after the high energy event. We find that the light...
No supernovae associated with two long-duration gamma-ray bursts (2006)
Fynbo, Johan P. U., Watson, Darach, Thöne, Christina C., Sollerman, Jesper, Bloom, Joshua S., Davis, Tamara M., ...
It is now accepted that long-duration gamma-ray bursts (GRBs) are produced during the collapse of a massive star(1,2). The standard 'collapsar' model(3) predicts that a broad-lined and luminous type...
Smith, Nathan, Li, Weidong, Foley, Ryan J., Wheeler, J. Craig, Pooley, Dave, Chornock, Ryan, ...
(abridged) We report our discovery and observations of the peculiar Type IIn supernova SN2006gy in NGC1260, revealing that it reached a peak magnitude of -22, making it the most luminous supernova...
Chen, Hsiao-Wen, Prochaska, Jason X., Ramirez-Ruiz, Enrico, Bloom, Joshua S., Dessauges-Zavadsky, Miroslava, Foley, Ryan J.
We investigate available constraints on the circumstellar medium (CSM) around long-duration gamma-ray burst (GRB) progenitors from afterglow spectra. We first establish a statistical sample of five...
On the incidence of strong MgII absorbers along gamma-ray burst sight lines (2006)
Prochter, Gabriel E., Prochaska, Jason X., Chen, Hsiao-Wen, Bloom, Joshua S., Dessauges-Zavadsky, Miroslava, Foley, Ryan J., ...
We report on a survey for strong ( rest equivalent width W-r >= 1 angstrom) intervening Mg II systems along the sight lines to long-duration gamma-ray bursts (GRBs). The GRB spectra that comprise the...
No supernovae associated with two long-duration gamma ray bursts (2006)
Fynbo, Johan P. U., Watson, Darach, Thoene, Christina C., Sollerman, Jesper, Bloom, Joshua S., Davis, Tamara M., ...
It is now accepted that long duration gamma-ray bursts (GRBs) are produced during the collapse of a massive star. The standard "collapsar" model predicts that a broad-lined and luminous Type Ic...
Temporal Variation in Excited Fe^+ Near a GRB Afterglow (2006)
Dessauges-Zavadsky, Miroslava, Chen, Hsiao-Wen, Prochaska, Jason X., Bloom, Joshua S., Barth, Aaron J.
Excited Si^+ and Fe^+ species are routinely observed in the host environment of gamma-ray burst (GRB) afterglows, but are not commonly seen in other extragalactic locations. Their presence signals...
Dissecting the Circumstellar Environment of Gamma-Ray Burst Progenitors (2006)
Prochaska, Jason X., Chen, Hsiao-Wen, Bloom, Joshua S.
We investigate properties of the interstellar medium (ISM) in galaxies hosting long-duration gamma-ray bursts (GRBs) from an analysis of atomic species (MgI, FeI) and excited fine-structure levels of...
No supernovae associated with two long-duration gamma-ray bursts (2006)
Fynbo, Johan P. U., Watson, Darach, Thöne, Christina C., Sollerman, Jesper, Bloom, Joshua S., Davis, Tamara M., ...
No supernovae associated with two long-duration gamma-ray bursts (2006)
Fynbo, Johan P. U., Watson, Darach, Thöne, Christina C., Sollerman, Jesper, Bloom, Joshua S., Davis, Tamara M., ...
Chen, Hsiao-Wen, Prochaska, Jason X., Bloom, Joshua S., Thompson, Ian B.
We present an echelle spectrum of the Swift GRB 050730, obtained four hours after the burst using the MIKE spectrograph on the Magellan Clay Telescope when the afterglow was at R=17.7. The spectrum...
Li, Weidong, Van Dyk, Schuyler D., Filippenko, Alexei V., Cuillandre, Jean-Charles, Jha, Saurabh, Bloom, Joshua S., ...
The stars that end their lives as supernovae (SNe) have been directly observed in only a handful of cases, due mainly to the extreme difficulty in identifying them in images obtained prior to the SN...
Astrometric Microlensing Constraints on a Massive Body in the Outer Solar System with Gaia (2005)
Gaudi, B. Scott, Bloom, Joshua S.
A body in Solar orbit beyond the Kuiper belt exhibits an annual parallax that exceeds its apparent proper motion by up to many orders of magnitude. Apparent motion of this body along the parallactic...
The Calibration of the Swift/UVOT Optical Observations: A Recipe for Photometry (2005)
Li, Weidong, Jha, Saurabh, Filippenko, Alexei V., Bloom, Joshua S., Pooley, David, Foley, Ryan J., ...
Swift/UVOT has the capability to provide critical insight into the physics of the early afterglows of gamma-ray bursts (GRBs). But without precise calibration of the UVOT to standard photometric...
Present and Future Prospects for GRB Standard Candles (2005)
Friedman, Andrew S., Bloom, Joshua S.
Following our previous work, we conclude that a GRB standard candle constructed from the Ghirlanda et al. power-law relation between the geometry-corrected energy (E_gamma) and the peak of the...
Prochaska, Jason X., Bloom, Joshua S., Chen, Hsiao-Wen, Hurley, Kevin C., Melbourne, Jason, Dressler, Alan, ...
We present Keck/NIRSPEC near-IR images and Magellan/IMACS optical spectroscopy of the host galaxy of GRB 031203. The host is an actively star-forming galaxy at z=0.1055 +/- 0.0001. This is the lowest...
Toward an Understanding of the Progenitors of Gamma-Ray Bursts (2003)
The various possibilities for the progenitors of gamma-ray bursts (GRBs) manifest in differing observable properties. Through deep spectroscopic and high-resolution imaging observations of some GRB...
The prompt energy release of gamma-ray bursts using a cosmological k-correction (2001)
Bloom, Joshua S., Frail, Dale A., Sari, Re'em
The fluences of gamma-ray bursts (GRBs) are measured with a variety of instruments in different detector energy ranges. A detailed comparison of the implied energy releases of the GRB sample...
Bloom, Joshua S., Sigurdsson, Steinn, Pols, Onno R.
We find the distribution of coalescence times, birthrates, spatial velocities, and subsequent radial offsets of coalescing neutron stars (NSs) in various galactic potentials accounting for large...
Gamma-ray bursts from stellar remnants: probing the Universe at high redshift (1997)
Bloom, Joshua S., Bagla, Jasjeet S., Natarajan, Priyamvada
A gamma-ray burst (GRB) releases an amount of energy similar to that of a supernova explosion, which combined with its rapid variability suggests an origin related to neutron stars or black holes....
Using STIS to find Gamma-Ray Burst Redshifts (1997)
Bloom, Joshua S., Sigurdsson, Steinn, Almaini, Omar, Tanvir, Nial R., Johnson, Rachel A.
A recent spectrum of the optical afterglow of GRB 970508 suggests that gamma-ray bursts (GRBs) are cosmological in origin and it is of crucial importance to derive an accurate distance to each burst....
Testing for Extragalactic Correlations of Gamma-Ray Bursts (1997)
Bloom, Joshua S., Tanvir, Nial R.
If gamma-ray bursts (GRBs) are cosmological they need not necessarily be spatially coincident with a host galaxy--in many cosmological models the progenitors are ejected to large distances from their...
The Corrected Log N-Log Fluence Distribution of Cosmological Gamma-Ray Bursts (1996)
Bloom, Joshua S., Fenimore, Edward E., Zand, Jean In 't
Recent analysis of relativistically expanding shells of cosmological gamma-ray bursts has shown that if the bursts are cosmological, then most likely total energy (E_0) is standard and not peak...
Determination of Distance from Time Dilation of Cosmological Gamma-Ray Bursts (1995)
Fenimore, Ed E., Bloom, Joshua S.
The isotropic distribution of gamma-ray bursts as observed with the Burst and Transient Experiment (BATSE) strongly suggests that the bursts are at cosmological distances. At such distances, the...
Protein quantification across hundreds of experimental conditions
Khan, Zia, Bloom, Joshua S., Garcia, Benjamin A., Singh, Mona, Kruglyak, Leonid
Quantitative studies of protein abundance rarely span more than a small number of experimental conditions and replicates. In contrast, quantitative studies of transcript abundance often span hundreds...