GRB 230802B
GCN Circular 34322
Subject
GRB 230802B: Fermi GBM Final Localization
Date
2023-08-03T01:25:55Z (2 years ago)
From
Joshua Wood at NASA/MSFC <joshua.r.wood@nasa.gov>
Via
Web form
The Fermi GBM team reports the detection of a likely LONG GRB
"At 23:58:47.92 UT on 02 August 2023, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 230802B (trigger 712713532/230802999).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 22.22, Dec = 9.62 (J2000 degrees, equivalent to J2000 1h 28m, +9d 37'),
with a statistical uncertainty of 5.88 degrees.
The angle from the Fermi LAT boresight is 77 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230802999/quicklook/glg_skymap_all_bn230802999.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/bn230802999/quicklook/glg_healpix_all_bn230802999.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230802999/quicklook/glg_lc_medres34_bn230802999.gif"
GCN Circular 34335
Subject
GRB 230802B: AstroSat CZTI detection
Date
2023-08-04T17:23:10Z (2 years ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>
Via
Web form
B. Pari (IITB), 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 GRB 230802B which was also detected by Fermi (Fermi GBM Team, GCN Circ. 34322).
The source was faintly detected in the 20-200 keV energy range in two quadrants. The light curve peaks at 2023-08-02 23:58:47.95 UTC. The measured peak count rate associated with the burst is 145.4 (+108.1, -8.4) counts/s above the background in the combined data of two quadrants, with a total of 169 (+54, -65) counts. The local mean background count rate was 151.0 (+5.2, -5.8) counts/s. Using cumulative rates, we measure a T90 of 2.7 (+0.8, -1.1) 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