GCN Circular 36875
Subject
GRB 240715A: Fermi GBM Observation
Date
2024-07-15T17:01:42Z (5 months ago)
From
Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>
Via
Web form
C. de Barra (UCD) and C. Meegan (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:
At 05:44:03.26 UT on 15 July 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240715A (trigger 742715048/240715239). The Final Real-time Localization was reported previously (Fermi GBM Team 2024, GCN 36866).
The angle from the Fermi LAT boresight is 75 degrees.
The GBM light curve consists of a single emission episode with a duration (T90)
of about 0.16 s (50-300 keV). The time-averaged spectrum from T0-0.06 to T0+0.19
is is best fit by a power law function with an exponential high-energy cutoff.
The power law index is -0.82 +/- 0.03 and the cutoff energy,
parameterized as Epeak, is 2323 +/- 232 keV.
The spectrum is equally well fit by a Band function with Epeak = 2275 +/- 267 keV, alpha = -0.82 +/- 0.03 and beta = -3.86 +/- 1.75.
The event fluence (10-1000 keV) in this time interval is
(2.9 +/- 0.9)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 47 +/- 2 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/