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GCN Circular 35478

Subject
GRB 240101C: AstroSat CZTI detection
Date
2024-01-04T04:38:33Z (2 months ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>
Via
Web form
P. K. Navaneeth (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 short-duration GRB 240101C which was also detected by Fermi-GBM (Fermi GBM team, GCN Circ. 35451), and GRBAlpha (Dafcikova et al., GCN Circ. 35459).

The source was detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-01-01 12:57:23.80 UTC. The measured peak count rate associated with the burst is 881 (+732, -43) counts/s above the background in the combined data of all quadrants, with a total of 69 (+31, -22) counts. The local mean background count rate was 331 (+13, -43) counts/s. Using cumulative rates, we measure a T90 of 0.13 (+0.06, -0.04) s.

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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