GCN Circular 32246
Subject
GRB 220623A: AstroSat CZTI detection
Date
2022-06-23T11:15:23Z (2 years ago)
From
Gaurav Waratkar at IIT,Bombay <gauravwaratkar@iitb.ac.in>
R. Gopalakrishnan (IUCAA), V. Prasad (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 220623A which was
also detected by Swift-BAT (Sbarufatti et al., GCN 32243), Swift-XRT
(Kennea et al., GCN 32244) and INTEGRAL SPI-ACS (TrigNum: 9966).
The source was clearly detected in the 20-200 keV energy range. The
light curve showed multiple peaks of emission with the strongest peak at
2022-06-23 07:04:14.500 UTC. The measured peak count rate associated
with the burst is 127 (+38, -17) counts/s above the background in the
combined data of three (out of four) quadrants, with a total of 738
(+204, -207) counts. The local mean background count rate was 360 (+2,
-2) counts/s. Using cumulative rates, we measure a T90 of 9 (+9, -2) s.
It was also clearly detected in the CsI anticoincidence (Veto) detector
in the 100-500 keV energy range. The light curve showed multiple peaks
of emission with the strongest peak at 2022-06-23 07:04:13.771 UTC. The
measured peak count rate is 570 (+74, -60) counts/s above the background
in the combined Veto data of all quadrants, with a total of 2919 (+440,
-459) counts. The local mean background count rate was 1502 (+5, -5)
counts/s. We measure a T90 of 8 (+4, -1) s from the cumulative Veto
light curve.
CZTI GRB detections are reported regularly on the payload site at
http://astrosat.iucaa.in/czti/?q=grb. 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.