Discovery of Radio Afterglow from the Most Distant Cosmic Explosion (2009)
Chandra, Poonam, Frail, Dale A., Fox, Derek, Kulkarni, Shrinivas, BErger, Edo, Cenko, S. Bradley, ...
We report the discovery of radio afterglow emission from the gamma-ray burst GRB 090423, which exploded at a redshift of 8.3, making it the object with the highest known redshift in the Universe. By...
X-rays from the explosion site: Fifteen years of light curves of SN 1993J (2009)
Chandra, Poonam, Dwarkadas, Vikram V., Ray, Alak, Immler, Stefan, Pooley, David
We present a comprehensive analysis of the X-ray light curves of SN 1993J in a nearby galaxy M81. This is the only supernova other than SN 1987A, which is so extensively followed in the X-ray bands....
Eleven Years of Radio Monitoring of the type IIn Supernova SN 1995N (2009)
Chandra, Poonam, Stockdale, Christopher J., Chevalier, Roger A., Van Dyk, Schuyler D., Ray, Alak, Kelley, Matthew T., ...
We present radio observations of the optically bright Type IIn supernova SN 1995N. We observed the SN at radio wavelengths with the Very Large Array for 11 years. We also observed it at low radio...
Modeling the X-ray emission of SN 1993J (2008)
Nymark, Tanja K., Chandra, Poonam, Fransson, Claes
We investigate the effects of radiative shocks on the observed X-ray emission from the Type II supernova SN 1993J. To this end, the X-ray emission is modeled as a result of the interaction between...
Eleven years of radio monitoring of the Type IIn supernova SN 1995N (2008)
Chandra, Poonam, Stockdale, Christopher J., Chevalier, Roger A., Van Dyk, Schuyler D., Ray, Alak, Kelley, Matthew T., ...
We present radio observations of the optically bright Type IIn supernova SN 1995N. We observed the SN at radio wavelengths with the Very Large Array (VLA) for 11 years. We also observed it at low...
A comprehensive study of GRB 070125, a most energetic gamma-ray burst (2008)
Chandra, Poonam, Cenko, S. Bradley, Frail, Dale A., Chevalier, Roger A., Macquart, Jean-Pierre, Kulkarni, Shri R., ...
We present a comprehensive multiwavelength analysis of the bright, long-duration gamma-ray burst GRB 070125, comprised of observations in gamma-ray, X-ray, optical, millimeter, and centimeter wave...
A comprehensive study of GRB 070125, a most energetic gamma-ray burst (2008)
Chandra, Poonam, Cenko, S. Bradley, Frail, Dale A., Chevalier, Roger A., Macquart, Jean-Pierre, Kulkarni, Shri R., ...
We present a comprehensive multiwavelength analysis of the bright, long-duration gamma-ray burst GRB 070125, comprised of observations in gamma-ray, X-ray, optical, millimeter, and centimeter wave...
Multiwaveband analysis of brightest GRB070125 (2008)
Chandra, Poonam, Cenko, S. Bradley, Frail, Dale A., Chevalier, Roger A., Macquart, Jean-Pierre, Kulkarni, Shri R., ...
We present a comprehensive multiwavelength analysis of the bright, long duration gamma-ray burst GRB 070125, comprised of observations in gamma-ray, X-ray, optical, millimeter and centimeter...
GRB 070125: The first long-duration gamma-ray burst in a halo environment (2008)
Cenko, S. Bradley, Fox, Derek B., Penprase, Brian E., Cucchiara, Antonio, Price, Paul A., Berger, Edo, ...
We present the discovery and high signal-to-noise ratio spectroscopic observations of the optical afterglow of the long-duration gamma-ray burst GRB 070125. Unlike all previously observed...
A comprehensive study of GRB 070125, a most energetic gamma ray burst (2008)
Chandra, Poonam, Cenko, S. Bradley, Frail, Dale, Chevalier, Roger, Macquart, Jean-Pierre, Kulkarni, Shri, ...
We present a comprehensive multiwavelength analysis of the bright, long duration gamma-ray burst GRB 070125, comprised of observations in $\gamma$-ray, X-ray, optical, millimeter and centimeter...
Seeking for the progenitors of type Ia supernovae (2008)
Patat, Ferdinando, Chandra, Poonam, Chevalier, Roger, Justham, Stephen, Podsiadlowski, Philipp, Wolf, Christian, ...
Type IIP supernova SN 2004et: a multiwavelength study in X-ray, optical and radio (2007)
Misra, Kuntal, Pooley, Dave, Chandra, Poonam, Bhattacharya, D., Ray, Alak K., Sagar, Ram, ...
Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
Type IIP Supernova SN 2004et: A Multi-Wavelength Study in X-Ray, Optical and Radio (2007)
Misra, Kuntal, Pooley, Dave, Chandra, Poonam, Bhattacharya, D., Ray, Alak K., Sagar, Ram, ...
We present X-ray, broad band optical and low frequency radio observations of the bright type IIP supernova SN 2004et. The \cxo observed the supernova at three epochs, and the optical coverage spans a...
Chandra's Tryst with SN 1995N (2005)
Chandra, Poonam, Ray, Alak, Schlegel, Eric M, Sutaria, Firoza K, Pietsch, Wolfgang
We present the spectroscopic and imaging analysis of Type IIn supernova SN 1995N observed with the Chandra X-Ray Observatory on 2004 March 27.We compare the spectrum obtained from our Chandra...
Chandra's tryst with SN 1995N (2005)
Chandra, Poonam, Ray, Alak, Schlegel, Eric M., Sutaria, Firoza K., Pietsch, Wolfgang
We present the spectroscopic and imaging analysis of a type IIn supernova SN 1995N observed with the Chandra X-ray observatory on 2004 March 27. We compare the spectrum obtained from our Chandra...
Chandra's tryst with SN 1995N (2005)
Chandra, Poonam, Ray, Alak, Schlegel, Eric M., Sutaria, Firoza K., Pietsch, Wolfgang
Chandra's Tryst with SN 1995N (2005)
Chandra, Poonam, Ray, Alak, Schlegel, Eric M, Sutaria, Firoza K, Pietsch, Wolfgang
We present the spectroscopic and imaging analysis of Type IIn supernova SN 1995N observed with the Chandra X-Ray Observatory on 2004 March 27.We compare the spectrum obtained from our Chandra...
Baby supernovae through the looking glass at long wavelengths (2004)
We emphasize the importance of observations of young supernovae in wide radio band. We argue on the basis of observational results that only high or only low frequency data is not sufficient to get...
Implications of aging in young supernovae (2004)
We present here the combined radio spectrum from the Giant Metrewave Radio Telescope (GMRT) and Very Large Array (VLA) of type-IIb SN 1993J (age 11 years) and a type-Ic SN 2003bg (age 1 year). In SN...
Associated HI Absorption in the z = 3:4 Radio Galaxy B2 0902 + 343 Observed with the GMRT (2004)
Chandra, Poonam, Swarup, Govind, Kulkarni, Vasant K, Kantharia, Nimisha G
We have made observations of the associated HI absorption of a high redshift radio galaxy 0902+34 at z = 3.395 with the Giant Meterwave Radio Telescope in the 323+/-1 MHz band. We find a narrow...
Synchrotron aging and the radio spectrum of SN 1993J (2004)
Chandra, Poonam, Ray, Alak, Bhatnagar, Sanjay
We combine the GMRT low frequency radio observations of SN 1993J with the VLA high frequency radio data to get a near simultaneous spectrum around day 3200 since explosion. The low frequency...
Synchrotron aging and the radio spectrum of SN 1993J (2004)
Chandra, Poonam, Ray, Alak, Bhatnagar, Sanjay
We combine the GMRT low frequency radio observations of SN 1993J with the VLA high frequency radio data to get a near simultaneous spectrum around day 3200 since explosion. The low frequency...
Synchrotron aging and the radio spectrum of SN 1993J (2004)
Chandra, Poonam, Ray, Alak, Bhatnagar, Sanjay
We combine the GMRT low frequency radio observations of SN 1993J with the VLA high frequency radio data to get a near simultaneous spectrum around day 3200 since explosion. The low frequency...
Associated HI Absorption in the z = 3:4 Radio Galaxy B2 0902 + 343 Observed with the GMRT (2004)
Chandra, Poonam, Swarup, Govind, Kulkarni, Vasant K, Kantharia, Nimisha G
We have made observations of the associated HI absorption of a high redshift radio galaxy 0902+34 at z = 3.395 with the Giant Meterwave Radio Telescope in the 323+/-1 MHz band. We find a narrow...
Radio Studies of Young Core Collapse Supernovae (2002)
Chandra, Poonam, Ray, Alak, Bhatnagar, Sanjay
Multi-frequency observations of two radio bright SNe (SN1993J, SN1979C) carried out over a year with GMRT are presented. Their radio light curves trace the evolution of the mass loss in the stellar...