| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB250126208 |
|
| T0 |
4:58:50 UTC |
GCN_circulars,Fermi GBM final loc |
| ra |
337.6208° |
IPN |
| decl |
-14.3833° |
IPN |
| pos_error |
3.17e-01° |
IPN |
| T90 |
100.61 s |
Fermi_GBM |
| T90_error |
1.145 s |
Fermi_GBM |
| T90_start |
4:58:53.552 UTC |
Fermi_GBM |
| fluence |
1.73e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
4.48e-08 erg/cm² |
Fermi_GBM |
| T100 |
104.162 s |
|
| GBM_located |
False |
|
| mjd |
60701.20752314815 |
GCN_circulars,Fermi GBM final loc |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB250126208 |
| trigger_name |
bn250126208 |
| ra |
337.4000° |
| decl |
-11.6100° |
| pos_error |
2.78e+00° |
| datum |
2025-01-26 |
| t_trigger |
4:58:50.992 UTC |
| T90 |
100.61 s |
| T90_error |
1.145 s |
| T90_start |
4:58:53.552 UTC |
| fluence |
1.73e-05 erg/cm² |
| fluence_error |
4.48e-08 erg/cm² |
| flux_1024 |
8.38e+00 erg/cm²/s |
| flux_1024_error |
3.02e-01 erg/cm²/s |
| flux_1024_time |
5.76e+00 erg/cm²/s |
| flux_64 |
1.02e+01 erg/cm²/s |
| flux_64_error |
1.27e+00 erg/cm²/s |
| IPN table |
|---|
| GRB_name |
GRB250126A |
| ra |
337.6208° |
| decl |
-14.3833° |
| pos_error |
3.17e-01° |
| GCN 39035 table |
|---|
| GRB_name |
GRB250126A |
| GCN_number |
39035 |
| Detection_method |
Fermi GBM final loc |
| t_trigger |
4:58:50 UTC |
| ra |
337.4000° |
| decl |
-11.6000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 39035
SUBJECT: GRB 250126A: Fermi GBM Final Real-time Localization
DATE: 25/01/26 05:09:08 GMT
FROM: Fermi GBM Team at MSFC/Fermi-GBM
The Fermi GBM team reports the detection of a likely LONG GRB
At 04:58:50 UT on 26 Jan 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250126A (trigger 759560335.992228 / 250126208).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 337.4, Dec = -11.6 (J2000 degrees, equivalent to J2000 22h 29m, -11d 35'), with a statistical uncertainty of 2.2 degrees.
The angle from the Fermi LAT boresight is 69.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250126208/quicklook/glg_skymap_all_bn250126208.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/bn250126208/quicklook/glg_healpix_all_bn250126208.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250126208/quicklook/glg_lc_medres34_bn250126208.gif
|
| GCN 39036 table |
|---|
| GRB_name |
GRB250126A |
| GCN_number |
39036 |
| Detection_method |
Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 39036
SUBJECT: GRB 250126A: BALROG localization (Fermi Trigger 759560335 / GRB 250126208)
DATE: 25/01/26 08:00:56 GMT
FROM: Jochen Greiner at MPE
T. Preis (University of Innsbruck) & J. Greiner (MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
759560335 at 04:58:50 on 26 Jan. 2025 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).
The best-fit position is:
RA(2000.0) = 334.6 deg
Decl.(2000.0) = -15.8 deg
The 1 sigma statistical error radius is 2.0 deg.
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB250126208/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB250126208/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB250126208/json
|
| GCN 39040 table |
|---|
| GRB_name |
GRB250126A |
| GCN_number |
39040 |
| Detection_method |
CALET |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 39040
SUBJECT: GRB 250126A: CALET Gamma-Ray Burst Monitor detection
DATE: 25/01/26 15:05:47 GMT
FROM: Yuta Kawakubo at Aoyama Gakuin University
S. Sugita, A. Yoshida, T. Sakamoto, Y. Kawakubo (AGU),
K. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii,
Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U),
N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence),
P. S. Marrocchesi (U of Siena),
and the CALET collaboration:
The long GRB 250126A (Fermi GBM Final Real-time Localization:
Fermi GBM team, GCN Circ. 39035; BALROG localization: Preis et al.,
GCN Circ 39036; MAXI/GSC detection: Okada et al., GCN Circ 39038)
was detected in the ground analysis of the CALET Gamma-ray
Burst Monitor (CGBM) data around 04:58:50.99 on 26 January 2025 (referenced
to the Fermi-GBM Observation: GCN Circ. 39035).
(https://cgbm.calet.jp/cgbm_trigger/flight/1421902612/index.html).
The burst signal was seen by all CGBM detectors.
The burst light curve shows a multi-peaked structure that starts
at T-0.3 sec, peaks at T+85.4 sec, and ends at T+100.1 sec.
The T90 and T50 durations measured by the HXM2 data are 96.9 +/- 1.4 sec
and 82.5 +/- 1.3 sec (7-100 keV), respectively.
The ground-processed light curve is available at
https://cgbm.calet.jp/cgbm_trigger/ground/1421902612/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.
|