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GCN Circular 33714

Subject
GRB 230430A: AstroSat CZTI detection
Date
2023-05-01T07:00:58Z (a year 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 short GRB 230430A which was also detected by Fermi (Fermi GBM Team, GCN Circ. 33713).

The source was clearly detected in the 20-200 keV energy range. The light curve peaks at 2023-04-30 07:47:18.95 UTC. The measured peak count rate associated with the burst is 4406 (+1160, -973) counts/s above the background in the combined data of all quadrants, with a total of 405 (+71, -61) counts. The local mean background count rate was 423 (+13, -39) counts/s. Using cumulative rates, we measure a T90 of 0.28 (+0.04, -0.02) s.

The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.

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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