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astro-ph.HE · High Energy Astrophysical Phenomenaastro-ph.IM · Instrumentation and Methods for Astrophysics

GRB 240612A/B is not exceptional under two sky shuffle tests of 4,421 Fermi GBM GRB triggers

We search the 9 November 2026 Fermi GBM trigger catalog for GRB pairs 600 seconds to one day apart. The input has 4,421 GRB entries from 2008 to 2026. Eight exact sky matches belong to six previously reported groups. One group was tentative. We keep the first trigger from each group before random tests. This leaves 4,414 entries and 2,893 time pairs. The leading remaining pair is GRB 240612A/B, 708.879 seconds and 13.639 degrees apart. Of 20,000 sky shuffles, 7,379 within year and location class, and 5,755 within month and location class, have an equal or smaller best score. The full-search tail fractions are 0.369 and 0.288. Its two public sky maps give a common-position factor of 8.18 under independent, isotropic sky models. The catalog spectral peaks are 220.2 +/- 17.5 and 66.9 +/- 2.4 keV. These different summaries do not support a simple delayed-copy lens claim, but different fit intervals prevent a joint physical rejection. GRBAlpha confirms the first burst, not the common source. The score has low power for broad positions and long gaps. No new repeated source, lens, population rate, or planet is confirmed. Code, frozen tables, map probabilities, hashes, figures, and offline instructions are included.

astronomy · Fermi GBM · gamma-ray bursts · repeated triggers · GRB 240612A · GRB 240612B · sky randomization · gravitational lens test · null result

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References

32
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