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GCN Circular 37711

Subject
GRB 241002B: Fermi GBM Observation
Date
2024-10-04T13:51:42Z (4 months ago)
From
Oliver J Roberts at USRA/NASA <oliver.roberts@nasa.gov>
Via
Web form
O.J. Roberts (USRA/NASA-MSFC), R. Hamburg (CNRS/IJCLab) and 
C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:

"At 06:14:18.76 UT on 02 October 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 241002B (trigger 749542463/241002260), which was also 
detected by Swift-BAT GUANO (DeLaunay et al. 2024, GCN 37004). It was tentatively 
associated with GOTO24gpc/AT 2024xbg (Kumar et al., 2024, GCN 37676, GCN 37694), 
though Swift-XRT observations do not find a fading X-ray counterpart 
(D'Elia et al., 2024, GCN 37707).

The angle from the Fermi LAT boresight is 124 degrees.

The GBM light curve consists of a single emission episode with a duration (T90)
of about 64 s (50-300 keV). The time-averaged spectrum from T0-2.0 to T0+72.0 s 
is best fit by a simple power law function with index -1.77 +/- 0.04.

The event fluence (10-1000 keV) in this time interval is 
(6.7 +/- 0.6)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from 
T0+0.064 s in the 10-1000 keV band is 3.9 +/- 0.3 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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