Detectability of Gamma-Ray Burst Excess Toward M31

Details Detectability of Gamma-Ray Burst Excess Toward M31 Detectability of Gamma-Ray Burst Excess Toward M31

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...461l..73l&link_type=abstract

Astrophysical Journal Letters v.461, p.L73

Astronomy and Astrophysics

Astronomy

6

Gamma Rays: Bursts, Galaxies: Individual Messier Number: M31, Stars: Neutron

Scientific paper

We calculate the expected excess of gamma-ray bursts (GRBs) from the direction of M31 assuming that GRBs come from an extended halo around both M31 and our own Galaxy. Specifically, we consider the delayed turn-on and halo-beaming models for GRBs. We express the ratio of GRB rate from M31 to our Galaxy as a function of instrument sensitivities, the observing solid angles toward M31, and the burst luminosity functions. This ratio tends to be much larger than 1 for a small observing angle (<10 deg) when the instrument can sample close to the distance of M31. Assuming that a hypothetical gamma-ray instrument is 10 times more sensitive than BATSE, we find in a 1 yr observation, for both imaging or nonimaging instruments, that the delayed turn-on model might be tested but no statistically significant signal is expected for the halo-beaming model. Thus, it is extremely difficult to rule out the halo-beaming model by observing M31.

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