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 220610B which was
also detected by INTEGRAL SPI-ACS (TrigNum 9952.0) and Fermi-GBM
The source was clearly detected in the 20-200 keV energy range. The
light curve peaks at 2022-06-10 07:04:43.50 UTC. The measured peak count
rate associated with the burst is 125 (+32, -20) counts/s above the
background in the combined data of two quadrants (out of four), with a
total of 969 (+230, -221) counts. The local mean background count rate
was 226 (+2, -2) counts/s. Using cumulative rates, we measure a T90 of
20 (+7, -8) s.
It was also clearly detected in the CsI anticoincidence (Veto) detector
in the 100-500 keV energy range. The light curve peaks at 2022-06-10
07:04:43.38 UTC. The measured peak count rate is 388 (+69, -71) counts/s
above the background in the combined Veto data of four quadrants, with a
total of 2179 (+368, -491) counts. The local mean background count rate
was 1471 (+5, -5) counts/s. We measure a T90 of 13 (+5, -3) 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.