GCN Circular 43741
Subject
GRB 260212A: AstroSat CZTI detection
Event
Date
2026-02-14T21:38:15Z (2 months ago)
Edited On
2026-02-15T01:37:49Z (2 months ago)
From
Anuraag Arya at IIT Bombay <aryaanuraag910@gmail.com>
Edited By
Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Anuraag Arya at IIT Bombay <aryaanuraag910@gmail.com>
Via
Web form
S. Salunke (IUCAA), Harsha K. H. (IUCAA), M. Tembhurnikar (IUCAA), U. Pathak (IITB), A. Arya (IITB), A. Goyal (IITB), G. Waratkar (Caltech/IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long GRB 260212A which was also detected by Fermi GBM (Fermi GBM Team, GCN Circ. 43716), and Glowbug (Cheung et. al., GCN Circ. 43719).
The source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2026-02-12 17:49:08.04 UTC. The measured peak count rate associated with the burst is 641 (+72, -52) counts/s above the background in the combined data of all quadrants, with a total of 1727 (+302, -376) counts. The local mean background count rate was 1247 (+6, -7) counts/s. We measure a T90 of 9.7 (+1.9, -0.5) s from the cumulative Veto light curve.
The source was also faintly detected in the CZT detectors in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2026-02-12 17:49:08.50 UTC. The measured peak count rate associated with the burst is 44 (+28, -5) counts/s above the background in the combined data of two quadrants (out of four), with a total of 144 (+111, -95) counts. The local mean background count rate was 130 (+1, -2) counts/s. Due to poor statistics, we cannot reliably estimate the T90 from it.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at:
http://astrosat.iucaa.in/czti/?q=grb