GRB 240807B
GCN Circular 37101
Subject
GRB 240807B: Fermi GBM Final Localization
Date
2024-08-08T14:20:13Z (10 months ago)
From
sumanbala2210@gmail.com
Via
Web form
The Fermi GBM team reports the detection of a likely SHORT GRB
"At 22:04:13.59 UT on 07 August 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240807B (trigger 744761058/240807920).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 297.35, Dec = -42.71 (J2000 degrees, equivalent to J2000 19h 49m, -42d 42'),
with a statistical uncertainty of 7.82 degrees.
The angle from the Fermi LAT boresight is 64 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240807920/quicklook/glg_skymap_all_bn240807920.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240807920/quicklook/glg_healpix_all_bn240807920.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240807920/quicklook/glg_lc_medres34_bn240807920.gif"
GCN Circular 37107
Subject
GRB 240807B: AstroSat CZTI detection of a short burst
Date
2024-08-08T21:14:18Z (10 months ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>
Via
Web form
A. Dasgupta (BITS Pilani, Hyderabad), G. Waratkar (IITB), J. Joshi (IUCAA), 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 240807B which was also detected by Fermi/GBM (Fermi GBM team, GCN Circ. 37101) and INTEGRAL/SPI-ACS (Trigger 10842).
The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-08-07 22:04:13.6 UTC. The measured peak count rate, as measured with 32 ms binning, is 431 (+266, -105) counts/s above the background in the combined data of three quadrants (out of four), with a total of 45 (+23, -24) counts. The local mean background count rate was 240 (+15, -22) counts/s. Using cumulative rates, we measure a T90 of 0.15 (+0.08, -0.09) 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