| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB250520442 |
|
| T0 |
10:36:01.897 UTC |
Fermi_GBM |
| ra |
100.6300° |
Fermi_GBM |
| decl |
68.6700° |
Fermi_GBM |
| pos_error |
3.35e+00° |
Fermi_GBM |
| T90 |
11.52 s |
Fermi_GBM |
| T90_error |
2.36 s |
Fermi_GBM |
| T90_start |
10:36:01.897 UTC |
Fermi_GBM |
| fluence |
1.48e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
2.60e-08 erg/cm² |
Fermi_GBM |
| T100 |
11.52 s |
|
| GBM_located |
True |
|
| mjd |
60815.44168862268 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB250520442 |
| trigger_name |
bn250520442 |
| ra |
100.6300° |
| decl |
68.6700° |
| pos_error |
3.35e+00° |
| datum |
2025-05-20 |
| t_trigger |
10:36:02.409 UTC |
| T90 |
11.52 s |
| T90_error |
2.36 s |
| T90_start |
10:36:01.897 UTC |
| fluence |
1.48e-06 erg/cm² |
| fluence_error |
2.60e-08 erg/cm² |
| flux_1024 |
2.78e+00 erg/cm²/s |
| flux_1024_error |
2.17e-01 erg/cm²/s |
| flux_1024_time |
2.75e+00 erg/cm²/s |
| flux_64 |
4.99e+00 erg/cm²/s |
| flux_64_error |
1.03e+00 erg/cm²/s |
| GCN 40501 table |
|---|
| GRB_name |
GRB250520B |
| GCN_number |
40501 |
| Detection_method |
Fermi GBM final loc |
| t_trigger |
10:36:02 UTC |
| ra |
100.6000° |
| decl |
68.7000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 40501
SUBJECT: GRB 250520B: Fermi GBM Final Real-time Localization
DATE: 25/05/20 10:46:39 GMT
FROM: Fermi GBM Team at MSFC/Fermi-GBM
The Fermi GBM team reports the detection of a likely LONG GRB
At 10:36:02 UT on 20 May 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250520B (trigger 769430167.408886 / 250520442).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 100.6, Dec = 68.7 (J2000 degrees, equivalent to J2000 06h 42m, 68d 42'), with a statistical uncertainty of 4.3 degrees.
The angle from the Fermi LAT boresight is 21.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250520442/quicklook/glg_skymap_all_bn250520442.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/bn250520442/quicklook/glg_healpix_all_bn250520442.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250520442/quicklook/glg_lc_medres34_bn250520442.gif
|