GCN Circular 36503
Subject
GRB 240516A: AstroSat CZTI detection
Date
2024-05-17T11:05:53Z (7 months 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 240516A which was also detected by Swift-BAT (Parsotan et al., GCN Circ. 36493) and Fermi-GBM (Fermi GBM team, GCN Circ. 36499).
The source was detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-05-16 03:36:35.02 UTC. The measured peak count rate associated with the burst is 181 (+32, -25) counts/s above the background in the combined data of all quadrants, with a total of 2323 (+336, -367) counts. The local mean background count rate was 1420 (+4, -4) counts/s. We measure a T90 of 22 (+2, -2) 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