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 30015

GRB 210515A: Fermi GBM Final Real-time Localization
2021-05-15T13:17:09Z (3 years ago)
Fermi GBM Team at MSFC/Fermi-GBM <>
The Fermi GBM team reports the detection of a likely LONG GRB

At 13:06:45 UT on 15 May 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210515A (trigger 642776810.702128 / 210515546).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 117.1, Dec = 77.3 (J2000 degrees, equivalent to J2000 07h 48m, 77d 17'), with a statistical uncertainty of 14.6 degrees.

The angle from the Fermi LAT boresight is 24.0 degrees.

The skymap can be found here:

The HEALPix FITS file, including the estimated localization systematic, can be found here:

The GBM light curve can be found here:
Looking for U.S. government information and services? Visit