Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 31539

GRB 220128A: AstroSat CZTI detection
2022-02-01T16:15:59Z (2 years ago)
Gaurav Waratkar at IIT,Bombay <>
V. Prasad (IUCAA), G. Waratkar (IITB), A. Suresh (IITB), A. Vibhute
(IUCAA), V. Bhalerao (IITB), D. Bhattacharya (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 detection of a long GRB 220128A, which was
also detected by Konus-Wind (Frederiks et al. GCN 31537) with IPN
localization (Kozyrev et al., GCN 31536).

The source was 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 2022-01-28
03:18:22.65 UT. The measured peak count rate is 617 (+71, -81) cts/s
above the background in the combined Veto data of four quadrants, with a
total of 4281 (+424, -589) cts. The local mean background count rate was
1477 (+4, -4) cts/s. We measure a T90 of 26 (+4, -4) s from the
cumulative Veto light curve.

CZTI GRB detections are reported regularly on the payload site at [1]. CZTI is built by a TIFR-led
consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC,
and PRL. The Indian Space Research Organisation funded, managed, and
facilitated the project. 

Looking for U.S. government information and services? Visit