Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.6904w&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #69.04; Bulletin of the American Astronomical Society, Vol. 34, p.1220
Other
Scientific paper
It is well known that high-energy emission (MeV-GeV) has been observed in a number of gamma-ray bursts, and temporally extended emission from lower energy gamma rays through radio wavelengths is well established. An important observed characteristic of some bursts at low energy is quiescence: an initial emission followed by a quiet period before a second (postquiescent) emission. However, evidence for significant high-energy, postquiescent emission had been lacking until GRB 990104. Here we present evidence for high-energy emission, coincident with lower energy emission, from the postquiescent emission episode of the very bright and long burst, GRB 990104. We show light curves and spectra that confirm emission above 50 MeV, approximately 152 s after the BATSE trigger and initial emission episode. Between the initial emission episode and the main peak, seen at both low and high energy, there was a quiescent period of ~100 s. This burst was found as part of a search for high-energy emission in gamma-ray bursts using the EGRET fixed interval (32 s) accumulation spectra, which provide sensitivity to later, high-energy emission that is otherwise missed by the standard EGRET BATSE-triggered burst spectra. It has been known for some time that an exciting question for the upcoming GLAST era is the behavior of the high-energy emission observed minutes or more after the initial emission. The characteristics of GRB 990104 support the necessity of extended observations. These results were summarized in ApJL 574:L47-L50.
Bertsch David L.
Ritz Steve
Wren David Nathan
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