While most gamma-ray bursts (GRBs) are now believed to be from cosmological distances, the origin of very short-time GRBs is still not known. In the past, we have shown that GRBs with time duration (T90) less than 100 ms may form a separate class of GRBs based on the hardness and time distribution of these events. We have also shown that the ln N ln S distribution is consistent with the expectation of quasi-Euclidean distribution of sources. In this paper, we report the study of the angular location of these GRBs showing a strong deviation from isotropy within the Galactic coordinates of plus 180 degrees < longitude < 90 degrees and -30 degrees < latitude < 30 degrees. We have studied the rest of the GRBs and do not find a similar deviation. This further indicates that the very-short GRBs likely form a separate class of GRBs, most probably from sources of Galactic or near solar origin.
CITATION STYLE
Cline, D. B., Matthey, C., & Otwinowski, S. (2006). Non-isotropic Angular Distribution for Very Short-Time Gamma-Ray Bursts? In Gamma-Ray Bursts in the Afterglow Era (pp. 56–59). Springer-Verlag. https://doi.org/10.1007/10853853_14
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