Expected gamma-ray burst excess from M31 based on halo models

Technical Report · Sun Dec 31 04:00:00 EST 1995

OSTI ID:211383

Li, Hui ^[1]; Liang, E ^[2]

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1. Los Alamos National Lab., NM (United States)
2. Rice Univ., Houston, TX (United States). Dept. of Space Physics and Astronomy

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`` model and halo beaming model for GRBs. We express the GRB rate from M31 as functions of instrument sensitivities, and the observing solid angle towards M31. We conclude that, with a gamma-ray instrument that is ten times more sensitive than BATSE, delayed turn-on model gives a strong excess of GRBs from M31 but halo beaming model gives only a possible marginal detection in over a year of observations.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: National Aeronautics and Space Administration, Washington, DC (United States); American Inst. of Physics, New York, NY (United States)
• OSTI ID: 211383
• Report Number(s): LA-UR--95-4512; CONF-9510332--3
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ASTROPHYSICS
COSMIC GAMMA BURSTS
COSMIC GAMMA SOURCES
COSMIC RAY SPECTROMETERS
COSMOLOGICAL MODELS
LIMITING VALUES