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GCN Circular 33868

Subject
GRB 230524A: AstroSat CZTI detection
Date
2023-05-24T13:31:35Z (10 months ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>
P K. Navaneeth (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 long GRB 230524A which was also detected by Fermi (Fermi GBM Team, GCN Circ. 33864), and AGILE (Panebianco et al., GCN Circ. 33867).

The source was detected in the 20-200 keV energy range. The light curve peaks at 2023-05-24 06:06:40.50 UTC. The measured peak count rate associated with the burst is 97 (+37, -13) counts/s above the background in the combined data of three quadrants (out of four), with a total of 617 (+249, -270) counts. The local mean background count rate was 324 (+2, -2) counts/s. Using cumulative rates, we measure a T90 of 16 (+6, -10) s.

The source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2023-05-24 06:06:40.50 UTC. The measured peak count rate associated with the burst is 448 (+71, -56) counts/s above the background in the combined data of all quadrants, with a total of 5102 (+531, -606) counts. The local mean background count rate was 1398 (+5, -5) counts/s. We measure a T90 of 22 (+10, -4) s from the cumulative Veto light curve.

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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