Constraints on the luminosities of galactic gamma-ray bursts

Constraints are found on the Galactic gamma‐ray burst luminosity function (assumed to be a truncated power law), assuming gamma‐ray bursts to be Galactic. Although most observed bursts span a narrow luminosity range, the intrinsic luminosity range can be very large. Angular isotropy additionally constrains the intrinsic luminosity range to be less than a factor of 5 for power‐law indices between −1 and 5, and requires either the maximum luminosity, the minimum luminosity, or both to be between 7.6×1041 and 1.5×1042 erg sec−1.