GCN Circular 36120
Subject
GRB 240414A: Fermi GBM Observation
Date
2024-04-15T20:36:01Z (18 days ago)
From
Ava Myers at NASA GSFC <ava.myers@nasa.gov>
Via
Web form
A. Myers (NPP/GSFC) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 02:20:39.26 UT on 14 April 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240414A (trigger 734754044/240414098).
which was also detected by Swift BAT (R. Caputo et al. 2024, GCN 36083).
The event was originally mislabeled as GRB 240414B
(Fermi GBM Team, GCN 36612). The Fermi GBM on-ground
location is consistent with the Swift BAT position.
The angle from the Fermi LAT boresight is 49 degrees.
The GBM light curve contains a double emission episode with a duration (T90)
of about 82 s (50-300 keV). The time-averaged spectrum
from T0-1.5 to T0+80.4 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -0.9 +/- 0.1 and the cutoff energy,
parameterized as Epeak, is 150 +/- 20 keV.
The event fluence (10-1000 keV) in this time interval is
(5.556 +/- 1.065)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-0.19 s in the 10-1000 keV band is 2.7 +/- 0.2 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/"