Evidence for TeV Emission from GRB 970417a

Details Evidence for TeV Emission from GRB 970417a Evidence for TeV Emission from GRB 970417a

2000-01-07

arxiv.org/abs/astro-ph/0001111v1

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figures

Scientific paper

Milagrito, a detector sensitive to very high energy gamma rays, monitored the northern sky from February 1997 through May 1998. With a large field of view and a high duty cycle, this instrument was well suited to perform a search for TeV gamma-ray bursts (GRBs). We report on a search made for TeV counterparts to GRBs observed by BATSE. BATSE detected 54 GRBs within the field of view of Milagrito during this period. An excess of events coincident in time and space with one of these bursts, GRB 970417a, was observed by Milagrito. The excess has a chance probability of $2.8 \times 10^{-5}$ of being a fluctuation of the background. The probability for observing an excess at least this large from any of the 54 bursts is $1.5 \times 10^{-3}$. No significant correlations were detected from the other bursts.

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