TITLE: GCN CIRCULAR NUMBER: 39849 SUBJECT: GRB 250322A: AstroSat CZTI detection of a short burst DATE: 25/03/23 08:02:08 GMT FROM: Gaurav Waratkar at IIT Bombay gauravwaratkar@iitb.ac.in
M. Tembhurnikar(IUCAA), J. Joshi (IUCAA), G. Waratkar (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 short-duration GRB 250322A which was also detected by Swift/BAT (Gupta et.al., GCN Circ. 39835).
The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2025-03-22 16:06:12.85 UTC. The measured peak count rate, as measured with 10 ms binning, associated with the burst is 1322 (+851, -197) counts/s above the background in the combined data of all quadrants, with a total of 113 (+37, -25) counts. The local mean background count rate was 426 (+24, -61) counts/s. Using cumulative rates, we measure a T90 of 0.18 (+0.04, -0.03) s.
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
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