//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33231 SUBJECT: GRB 230128A: Fermi GBM Final Real-time Localization DATE: 23/01/28 22:57:57 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 22:47:49 UT on 28 Jan 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230128A (trigger 696638874.07722 / 230128950). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 197.6, Dec = 61.7 (J2000 degrees, equivalent to J2000 13h 10m, 61d 42'), with a statistical uncertainty of 6.3 degrees. The angle from the Fermi LAT boresight is 90.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230128950/quicklook/glg_skymap_all_bn230128950.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/bn230128950/quicklook/glg_healpix_all_bn230128950.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230128950/quicklook/glg_lc_medres34_bn230128950.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33235 SUBJECT: GRB 230128A: AstroSat CZTI detection DATE: 23/01/30 09:22:07 GMT FROM: Gaurav Waratkar at IIT,Bombay P K. Navaneeth (IUCAA), R. Gopalakrishnan (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 GRB230128A which was also detected by Fermi GBM (GCN Circ. 33231). It was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2023-01-28 22:48:33.09 UTC. The measured peak count rate is 669 (+68, -52) counts/s above the background in the combined Veto data of all quadrants, with a total of 9446 (+1558, -2165) counts. The local mean background count rate was 2912 (+3, -5) counts/s. We measure a T90 of 53 (+12, -16) 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.