Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 30539

GRB 210714A: Fermi GBM observation
2021-07-28T15:20:05Z (3 years ago)
Elisabetta Bissaldi at INFN,Bari <>
E. Bissaldi (Politecnico and INFN Bari)
reports on behalf of the Fermi GBM Team:

"At 07:56:33.25 UT on 14 July 2021, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 210714A (trigger 647942198 / 210714331),
which was also detected by Konus-Wind (Frederiks et al. 2021, GCN 30467).

The on-ground calculated location, using the GBM trigger data, is
RA = 313.67, DEC = -51.59
(J2000 degrees, equivalent to 20 h 54 m, -51 d 35'),
with a statistical uncertainty
of 1 degree (radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which we have characterized as a core-plus-tail model, with 90% of
GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg
systematic error. [Connaughton et al. 2015, ApJS, 216, 32]).

The angle from the Fermi LAT boresight at the GBM trigger time is 109 degrees.

The GBM light curve consists of a bright, FRED-like pulse
with a duration (T90) of about 42 s (50-300 keV).
The time-averaged spectrum from T0 to T0+25 s is
best fit by a Band function with Epeak = 64 +/- 5 keV,
alpha = -0.68 +/- 0.09, and beta = -1.75 +/- 0.01.

The event fluence (10-1000 keV) in this time interval is
(4.67 +/- 0.15)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.9 s in the 10-1000 keV band
is 48.9 +/- 0.7 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:

For Fermi GBM data and info, please visit the official Fermi GBM Support Page:"
Looking for U.S. government information and services? Visit