| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB250824475 |
|
| T0 |
11:24:18 UTC |
GCN_circulars,Fermi GBM final loc |
| ra |
311.9500° |
Fermi_GBM |
| decl |
49.5500° |
Fermi_GBM |
| pos_error |
2.75e+00° |
Fermi_GBM |
| T90 |
58.881 s |
Fermi_GBM |
| T90_error |
0.81 s |
Fermi_GBM |
| T90_start |
11:24:29.129 UTC |
Fermi_GBM |
| fluence |
2.01e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
3.48e-08 erg/cm² |
Fermi_GBM |
| T100 |
70.01 s |
|
| GBM_located |
True |
|
| mjd |
60911.47520833334 |
GCN_circulars,Fermi GBM final loc |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB250824475 |
| trigger_name |
bn250824475 |
| ra |
311.9500° |
| decl |
49.5500° |
| pos_error |
2.75e+00° |
| datum |
2025-08-24 |
| t_trigger |
11:24:18.377 UTC |
| T90 |
58.881 s |
| T90_error |
0.81 s |
| T90_start |
11:24:29.129 UTC |
| fluence |
2.01e-05 erg/cm² |
| fluence_error |
3.48e-08 erg/cm² |
| flux_1024 |
1.34e+01 erg/cm²/s |
| flux_1024_error |
2.78e-01 erg/cm²/s |
| flux_1024_time |
5.93e+01 erg/cm²/s |
| flux_64 |
1.70e+01 erg/cm²/s |
| flux_64_error |
1.21e+00 erg/cm²/s |
| GCN 41522 table |
|---|
| GRB_name |
GRB250824A |
| GCN_number |
41522 |
| Detection_method |
Fermi GBM final loc |
| t_trigger |
11:24:18 UTC |
| ra |
312.0000° |
| decl |
49.5000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 41522
SUBJECT: GRB 250824A: Fermi GBM Final Real-time Localization
DATE: 25/08/24 11:34:48 GMT
FROM: Fermi GBM Team at MSFC/Fermi-GBM
The Fermi GBM team reports the detection of a likely LONG GRB
At 11:24:18 UT on 24 Aug 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250824A (trigger 777727463.376698 / 250824475).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 312.0, Dec = 49.5 (J2000 degrees, equivalent to J2000 20h 48m, 49d 30'), with a statistical uncertainty of 2.0 degrees.
The angle from the Fermi LAT boresight is 61.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250824475/quicklook/glg_skymap_all_bn250824475.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/bn250824475/quicklook/glg_healpix_all_bn250824475.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250824475/quicklook/glg_lc_medres34_bn250824475.gif
|
| GCN 41572 table |
|---|
| GRB_name |
GRB250824A |
| GCN_number |
41572 |
| Detection_method |
Fermi GBM Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 41572
SUBJECT: GRID detection of GRB 250824A
DATE: 25/08/28 02:17:34 GMT
FROM: GRID Student Team at Tsinghua University
Longhao Li, Chenyu Wang and Zirui Yang report on behalf of the GRID Collaboration:
GRID-11B reports the detection of the GRB 250824A, which was also detected by Fermi/GBM (GCN Circular 41522).
The event was triggered with GRID on 2025-08-24 at 11:24:15 UTC. The measured burst duration (T90) is approximately 78.2 ± 5.6 seconds.
The GRID light curve of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB250824A/GRID_GRB250824A_ltcv.pdf.
GRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4. |