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GCN Circular 38015

Subject
GRB 241030A: Fermi GBM Observation
Date
2024-10-31T15:13:27Z (2 months ago)
From
Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>
Via
Web form
C. de Barra (UCD) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:

"At 05:48:03.33 UT on 30 October 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB241030A (trigger 751960088/241030242).
which was also detected by Swift-BAT (Klingler et al. 2024, GCN 37956), SVOM-GRM (Wang et al. 2024, GCN 37972), and Konus-Wind (Ridnaia et al. 2024, GCN 37982)
The Fermi GBM on-ground location is consistent with the Swift position.

The angle from the Fermi LAT boresight is 17 degrees.

The GBM light curve consists of multiple emission episodes with a duration (T90)
of about 166 s (50-300 keV). The time-averaged spectrum
from T0-21 to T0+217 s is best fit by
a Band function with Epeak = 129 +/- 7 keV,
alpha = -1.35 +/- 0.02, and beta = -2.31 +/- 0.08.

The event fluence (10-1000 keV) in this time interval is
(6.235 +/- 0.095)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+147 s in the 10-1000 keV band is 20 +/- 0.4 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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