Multi-wavelength Study of Prompt Optical Counterparts of Swift GRBs Detected by ROTSE-III

Details Multi-wavelength Study of Prompt Optical Counterparts of Swift GRBs Detected by ROTSE-III Multi-wavelength Study of Prompt Optical Counterparts of Swift GRBs Detected by ROTSE-III

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921201r&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #212.01; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Gamma-ray bursts (GRBs) are some of the most energetic explosions in the universe, releasing over 10^51 ergs in gamma-rays in tens of seconds. GRBs have broadband prompt emission and early afterglows that are visible in optical light, X-Rays, and gamma-rays. Observations of the prompt and early multi-wavelength emission from GRBs are essential to constrain models of GRB emission and late-time energy injection. The narrow-field instruments on the Swift satellite are able to respond to GRBs in under 90s, but this cannot probe the earliest phase of the
explosion. The Robotic Optical Transient Search Experiment (ROTSE-III) is a global array of 0.45m telescopes designed for rapid 5-10s responses to GRB triggers from the Swift satellite. We have obtained over 12 multi-wavelength lightcurves covering the gamma-rays (BAT), X-rays (XRT), and optical (ROTSE-III), with the first optical observations less than 20 s after the start of the burst in many cases. We find a heterogeneous set of prompt emission and early afterglow behavior, often with different wavebands quite dissimilar. Although many of the early X-ray lightcurves are less steep than predicted in the standard fireball model of GRBs, the multiwavelength lightcurves are not consistent with simple energy injection models. We also discuss the possible implications for GRB emission.

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