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GCN Circular 36516

Subject
GRB 240519A: AstroSat CZTI detection
Date
2024-05-20T07:33:32Z (24 days ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>
Via
Web form
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 long-duration GRB 240519A which was also detected by Fermi-GBM (Preis et al., GCN Circ. 36513).

The source was detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-05-19 05:06:59.32 UTC. The measured peak count rate associated with the burst is 156 (+84, -8) counts/s above the background in the combined data of all quadrants, with a total of 906 (+431, -413) counts. The local mean background count rate was 1334 (+6, -8) counts/s. We measure a T90 of 8.2 (+5.9, -3.6) s from the cumulative Veto light curve.

The source was also faintly detected in the CZT detectors in the 20-200 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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