Fermi LAT Observations of High Energy Gamma-Ray Burst Afterglows

Details Fermi LAT Observations of High Energy Gamma-Ray Burst Afterglows Fermi LAT Observations of High Energy Gamma-Ray Burst Afterglows

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21520703m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #207.03; Bulletin of the American Astronomical Society, Vol. 36, p.1111

Astronomy and Astrophysics

Astronomy

Scientific paper

Temporally extended emission is proving a ubiquitous feature of the high energy emission from gamma-ray bursts seen by Fermi-LAT with significant implications for our understanding of these enigmatic phenomena. In this talk I will summarize the LAT observations of extended emission from GRB with a particular focus on very long duration emission from two GRB in March 2009 (GRB 090323 and GRB 090328). In both cases, an Autonomous Repoint Request allowed the afterglow emission to be monitored for 5 hours, and a significant high-energy signal was detected in the LAT up to several kilo-seconds. We will report on the time-resolved GBM and LAT joint spectroscopy in the prompt phase, and on the temporal study of the late extended emission in the LAT. These observations give new insight in the energetics and emission mechanisms in the prompt and afterglow phases of gamma-ray bursts.

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