TITLE:   GCN CIRCULAR
NUMBER:  36875
SUBJECT: GRB 240715A: Fermi GBM Observation
DATE:    24/07/15 17:01:42 GMT
FROM:    Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>

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/