GRB 210323A: Fermi GBM detection
Abstract
"At 22:02:18.40 UT on 23 March 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 210323A (trigger 638229743 / 210323918), which was also detected by the Swift/BAT and Swift/XRT (Gropp et al. 2021, GCN 29699). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 92 degrees. The GBM light curve shows a single-peaked structure with a duration (T90) of about 1 s (50-300 keV). The time-averaged spectrum from T0-0.064 s to T0+0.192 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.97 +/- 0.05 and the cutoff energy, parameterized as Epeak, is 2.1 +/- 0.4 MeV. A Band function also fits the spectrum with Epeak = 2.1 +/- 0.5 MeV, alpha = -0.97 +/- 0.05 and beta = -3.02 +/- 1.02. The event fluence (10-1000 keV) in this time interval is (1.2 +/- 0.1)E-06 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.064 s in the 10-1000 keV band is 21.3 +/- 1.5 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
- Publication:
-
GRB Coordinates Network
- Pub Date:
- March 2021
- Bibcode:
- 2021GCN.29709....1H