GRB 231123A
GCN Circular 35162
Subject
GRB 231123A: Fermi GBM Final Real-time Localization
Date
2023-11-23T02:54:35Z (2 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely SHORT GRB
At 02:44:04 UT on 23 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231123A (trigger 722400249.776634 / 231123114).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 83.8, Dec = -19.6 (J2000 degrees, equivalent to J2000 05h 35m, -19d 36'), with a statistical uncertainty of 9.2 degrees.
The angle from the Fermi LAT boresight is 95.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231123114/quicklook/glg_skymap_all_bn231123114.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231123114/quicklook/glg_healpix_all_bn231123114.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231123114/quicklook/glg_lc_medres34_bn231123114.gif
GCN Circular 35173
Subject
GRB 231123A: AstroSat CZTI detection
Date
2023-11-24T07:55:13Z (2 years 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 faint GRB 231123A which was also detected by Fermi-GBM (Fermi GBM team, GCN Circ. 35162).
We see a faint detection in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2023-11-23 02:44:04.5 UTC. The measured peak count rate associated with the burst is 173 (+82, -43) counts/s above the background in the combined data of three quadrants (out of four), with a total of 203 (+97, -93) counts. The local mean background count rate was 272 (+4, -6) counts/s. Using cumulative rates, we measure a T90 of 3.5 (+1.5, -2.3) 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