| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
11:17:18 UTC |
GCN_circulars,Fermi GBM final loc |
| ra |
324.9000° |
GCN_circulars,Fermi GBM final loc |
| decl |
11.3000° |
GCN_circulars,Fermi GBM final loc |
| GBM_located |
True |
|
| mjd |
60825.470347222225 |
GCN_circulars,Fermi GBM final loc |
| GCN 40580 table |
|---|
| GRB_name |
GRB250530B |
| GCN_number |
40580 |
| Detection_method |
Fermi GBM final loc |
| t_trigger |
11:17:18 UTC |
| ra |
324.9000° |
| decl |
11.3000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 40580
SUBJECT: GRB 250530B: Fermi GBM Final Real-time Localization
DATE: 25/05/30 11:27:57 GMT
FROM: Fermi GBM Team at MSFC/Fermi-GBM
The Fermi GBM team reports the detection of a likely LONG GRB
At 11:17:18 UT on 30 May 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250530B (trigger 770296643.008128 / 250530470).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 324.9, Dec = 11.3 (J2000 degrees, equivalent to J2000 21h 39m, 11d 18'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 0.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250530470/quicklook/glg_skymap_all_bn250530470.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/bn250530470/quicklook/glg_healpix_all_bn250530470.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250530470/quicklook/glg_lc_medres34_bn250530470.gif
|