TITLE: GCN CIRCULAR NUMBER: 42178 SUBJECT: GRB 250916A: TERI Gamma-ray detection DATE: 25/10/09 21:13:22 GMT FROM: Daniel Shy danielshy@danielshy.com
Daniel Shy (a), C.C. Cheung (a), Bernard Phlips (a), Michael Streicher (b), James Mason (b), Douglas M. Groves (b), Feng Zhang (b), Willy Kaye (b)
(a) U.S. Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC 20375
(b) H3D, Inc., 812 Avis Dr., Ann Arbor, MI 48108, USA
The cadmium zinc TElluride Radiation Imager (TERI) gamma-ray telescope [1], operating on the International Space Station, reports the detection of GRB 250916A, which was also detected by Fermi/GBM (Fermi GBM Team, GCN Circ., 41839), Astrosat/CZTI (Arya et al., GCN Circ. 41843), Glowbug (Cheung et al., GCN Circ. 41855), CALET/GBM (Trig ID. 1442064382), and NuSTAR (41871).
Using 1 Hz binning, the peak count rate is roughly 23 excess counts per second (cps) at ~T0+259s (adopting T0 = 2025-09-16 13:29:21.1) over a baseline rate of 41-cps observed in nearby off-source intervals. We do not detect the initial faint burst at T0 detected by Fermi/GBM.
The analysis results presented here are preliminary and currently lack a detailed response function.
TERI is an Office of Naval Research funded technology demonstrator for large-volume pixelated CdZnTe detectors developed, built, and operated by the U.S. Naval Research Laboratory (NRL) in conjunction with H3D, Inc. The pixelated CdZnTe detectors have an energy of 40 keV to 3 MeV per pixel. It was launched on 2025 April 21 aboard the Department of Defense Space Test Program’s STP-H10 to the ISS. On the ISS, it is located on the SOX external payload facility on the Columbus module.
[1] Shy, Daniel, et al. "Development of the cadmium zinc TElluride Radiation Imager." Journal of Astronomical Telescopes, Instruments, and Systems 10.4 (2024): 044009-044009 (arXiv:2408.04559).
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