TITLE: GCN CIRCULAR NUMBER: 42130 SUBJECT: GRB 251006A (short): Glowbug gamma-ray detection DATE: 25/10/06 20:09:57 GMT FROM: C.C. Cheung at Naval Research Lab Teddy.Cheung@nrl.navy.mil
C.C. Cheung, R. Woolf, M. Kerr, J.E. Grove (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge, D. Kocevski (MSFC), and M.S. Briggs (UAH) report:
The Glowbug gamma-ray telescope [1,2,3], operating on the International Space Station, reports the detection of GRB 251006A, which was also detected by Fermi/GBM (GCN 42124).
Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2025-10-06 13:27:33.944 with a duration of 0.26 s and a total significance of about 18.8 sigma. The light curve comprises a single peak with possible substructure.
The analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.
Glowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Program’s STP-H9 to the ISS, and operated until 2024 April when it was put in safe storage on orbit. Glowbug was recently removed from storage and resumed operation on 2025 September 12.
[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959 [2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O [3] Woolf, R.S. et al. 2024, Proc. SPIE, 13151, id. 1315108
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