Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.4104n&link_type=abstract
American Astronomical Society Meeting 210, #41.04; Bulletin of the American Astronomical Society, Vol. 39, p.155
Other
Scientific paper
According to theory, the gamma-ray emission of gamma-ray bursts (GRBs) is produced by a highly relativistic collimated wind while the afterglow is produced by a decelerating blast wave that propagates into the circum-burst medium. This model predicts orphan afterglows, i.e., afterglows that are not accompanied by the prompt gamma-ray emission. An orphan afterglow is observed when a blast wave, which originally pointed away from the observer, decelerates and its radiation beam become wide enough to include the observer. So far most of the afterglow searches were carried out using optical surveys, with no success. Optical searches were found to be limited by the telescopes small field-of-view and by the large contamination of unrelated optical transients. Now, with the upcoming launch of GLAST, a new opportunity for a GeV orphan afterglow search is opening. GLAST sensitivity is ideally situated in the range where the afterglow synchrotron-self-Compton emission peaks, and it has the advantages of a large field-of-view and a low number of other predicted GeV transient. Here we discuss GLAST prospects for detecting GeV orphan afterglows.
Ando Shin'ichiro
Nakar Ehud
Sari Re'em
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