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GCN Circular 36717

Subject
GRB 240619A: Fermi GBM Observation
Date
2024-06-21T01:21:00Z (a month ago)
Edited On
2024-06-21T02:07:39Z (a month ago)
From
Sarah Dalessi at UAH <sd0104@uah.edu>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Sarah Dalessi at UAH <sd0104@uah.edu>
Via
Web form
S. Dalessi (UAH) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:

"At 03:43:31.00 UT on 19 June 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240619A (trigger 740461416/240619155), which was also 
detected by the Gravitational-wave Optical Transient Observer (GOTO) (Gompertz et al. 2024, GCN 36715). 
The Fermi-GBM Final Real-time location (Fermi GBM Team 2024, GCN 36694) 
is consistent with the GOTO position.


The angle from the Fermi LAT boresight is 63 degrees.

The GBM light curve two emission episodes with a duration (T90)
of about 36.1 s (50-300 keV). The time-averaged spectrum
from T0+0.002 to T0+36.129 s is best fit by
a Band function with Epeak = 110 +/- 50 keV,
alpha = -1.3 +/- 0.2, and beta = -1.70 +/- 0.04.

The event fluence (10-1000 keV) in this time interval is
(1.19 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.096 s in the 10-1000 keV band is 19.1 +/- 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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