TITLE: GCN CIRCULAR NUMBER: 36756 SUBJECT: GRB240624A: Fermi GBM Observation DATE: 24/06/25 07:59:09 GMT FROM: Cuán de Barra at UCD cuan.debarra@ucdconnect.ie
C. de Barra (UCD) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 06:01:11.37 UT on 24 June 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240624A (trigger 740901676/240624251). which was also detected by Swift BAT (N. J. Klingler et al. 2024, GCN 36743). The Fermi GBM on-ground location is consistent with the Swift BAT position.
The angle from the Fermi LAT boresight is 83 degrees.
The GBM light curve consists of a single emission episode with a duration (T90) of about 2 s (50-300 keV). The time-averaged spectrum from T0-3.1 to T0+2.0 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.45 +/- 0.39 and the cutoff energy, parameterized as Epeak, is 90 +/- 13 keV.
The event fluence (10-1000 keV) in this time interval is (7.0 +/- 0.8)E-07 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.38 s in the 10-1000 keV band is 6 +/- 1 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/"
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