| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
23:50:24 UTC |
GCN_circulars,Fermi GBM final loc |
| ra |
39.3000° |
GCN_circulars,Fermi GBM final loc |
| decl |
45.6000° |
GCN_circulars,Fermi GBM final loc |
| GBM_located |
True |
|
| mjd |
60726.99333333333 |
GCN_circulars,Fermi GBM final loc |
| GCN 39391 table |
|---|
| GRB_name |
GRB250220B |
| GCN_number |
39391 |
| Detection_method |
Fermi GBM final loc |
| t_trigger |
23:50:24 UTC |
| ra |
39.3000° |
| decl |
45.6000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 39391
SUBJECT: GRB 250220B: Fermi GBM Final Real-time Localization
DATE: 25/02/21 00:00:55 GMT
FROM: Fermi GBM Team at MSFC/Fermi-GBM
The Fermi GBM team reports the detection of a likely LONG GRB
At 23:50:24 UT on 20 Feb 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250220B (trigger 761788229.197974 / 250220993).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 39.3, Dec = 45.6 (J2000 degrees, equivalent to J2000 02h 37m, 45d 36'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 3.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250220993/quicklook/glg_skymap_all_bn250220993.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250220993/quicklook/glg_healpix_all_bn250220993.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250220993/quicklook/glg_lc_medres34_bn250220993.gif
|