GRB 240721A
GCN Circular 36914
Subject
GRB 240721A: Fermi GBM Final Real-time Localization
Date
2024-07-21T08:43:41Z (10 months ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 08:32:57 UT on 21 Jul 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240721A (trigger 743243582.02364 / 240721356).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 122.2, Dec = 7.1 (J2000 degrees, equivalent to J2000 08h 08m, 7d 05'), with a statistical uncertainty of 8.8 degrees.
The angle from the Fermi LAT boresight is 101.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240721356/quicklook/glg_skymap_all_bn240721356.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240721356/quicklook/glg_healpix_all_bn240721356.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240721356/quicklook/glg_lc_medres34_bn240721356.gif
GCN Circular 36916
Subject
Fermi Gamma-ray Burst Monitor trigger 743243582/240721356 (GRB 240721A) is not a GRB
Date
2024-07-21T16:28:21Z (10 months ago)
From
Cori Fletcher at USRA <cfletcher@usra.edu>
Via
Web form
B. Mailyan (Florida Tech) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:
"The Fermi Gamma-ray Burst Monitor (GBM) trigger 743243582/240721356 (GRB 240721A, GCN 36914) at 08:32:57.02 UT on 21 July 2024, tentatively classified as a GRB, is in fact not due
to a GRB. This trigger is likely due to a solar flare."