GRB 250127B
GCN Circular 39046
Subject
GRB 250127B: Fermi GBM Final Real-time Localization
Date
2025-01-27T15:25:16Z (4 months ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 15:14:38 UT on 27 Jan 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250127B (trigger 759683683.583014 / 250127635).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 126.4, Dec = -14.0 (J2000 degrees, equivalent to J2000 08h 25m, -14d 00'), with a statistical uncertainty of 4.8 degrees.
The angle from the Fermi LAT boresight is 96.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250127635/quicklook/glg_skymap_all_bn250127635.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/bn250127635/quicklook/glg_healpix_all_bn250127635.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250127635/quicklook/glg_lc_medres34_bn250127635.gif
GCN Circular 39049
Subject
Fermi GRB 250127B: Global MASTER-Net observations report
Date
2025-01-27T18:46:18Z (4 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko,
A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin,
V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 250127B ( Fermi GBM team, GCN 39046) errorbox 8653 sec after notice time and 8678 sec after trigger time at 2025-01-27 17:39:17 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 79 deg. The sun altitude is -31.2 deg.
The galactic latitude b = 13 deg., longitude l = 241 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2757386
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
8709 | 2025-01-27 17:39:17 | MASTER-Tavrida | (08h 26m 29.18s , -13d 05m 34.9s) | C | 60 | 17.4 |
9585 | 2025-01-27 17:53:53 | MASTER-Tavrida | (08h 26m 26.09s , -13d 07m 38.9s) | C | 60 | 17.0 |
9659 | 2025-01-27 17:55:07 | MASTER-Tavrida | (08h 21m 05.82s , -14d 24m 11.6s) | C | 60 | 17.0 |
9733 | 2025-01-27 17:56:21 | MASTER-Tavrida | (08h 29m 21.40s , -14d 25m 09.7s) | C | 60 | 17.2 |
9885 | 2025-01-27 17:58:53 | MASTER-Tavrida | (08h 13m 21.91s , -15d 42m 30.9s) | C | 60 | 17.0 |
9960 | 2025-01-27 18:00:08 | MASTER-Tavrida | (08h 21m 46.42s , -15d 43m 06.4s) | C | 60 | 16.8 |
10188 | 2025-01-27 18:03:56 | MASTER-Tavrida | (08h 26m 28.97s , -13d 06m 24.3s) | C | 60 | 16.9 |
10262 | 2025-01-27 18:05:10 | MASTER-Tavrida | (08h 21m 06.32s , -14d 26m 13.7s) | C | 60 | 16.7 |
10345 | 2025-01-27 18:06:33 | MASTER-Tavrida | (08h 29m 24.09s , -14d 24m 04.8s) | C | 60 | 16.7 |
10498 | 2025-01-27 18:09:06 | MASTER-Tavrida | (08h 13m 22.35s , -15d 42m 47.7s) | C | 60 | 16.8 |
10573 | 2025-01-27 18:10:21 | MASTER-Tavrida | (08h 21m 46.78s , -15d 43m 23.2s) | C | 60 | 16.5 |
10810 | 2025-01-27 18:14:18 | MASTER-Tavrida | (08h 26m 29.19s , -13d 06m 37.1s) | C | 60 | 16.4 |
10886 | 2025-01-27 18:15:34 | MASTER-Tavrida | (08h 21m 06.55s , -14d 26m 28.9s) | C | 60 | 16.4 |
10969 | 2025-01-27 18:16:57 | MASTER-Tavrida | (08h 29m 24.38s , -14d 24m 13.0s) | C | 60 | 16.4 |
11120 | 2025-01-27 18:19:28 | MASTER-Tavrida | (08h 13m 22.91s , -15d 43m 04.6s) | C | 60 | 16.4 |
11203 | 2025-01-27 18:20:51 | MASTER-Tavrida | (08h 21m 47.60s , -15d 43m 39.9s) | C | 60 | 16.1 |
11430 | 2025-01-27 18:24:38 | MASTER-Tavrida | (08h 26m 29.38s , -13d 06m 49.0s) | C | 60 | 15.6 |
11504 | 2025-01-27 18:25:52 | MASTER-Tavrida | (08h 21m 06.72s , -14d 26m 40.9s) | C | 60 | 15.4 |
11579 | 2025-01-27 18:27:07 | MASTER-Tavrida | (08h 29m 26.07s , -14d 24m 28.8s) | C | 60 | 15.6 |
11739 | 2025-01-27 18:29:47 | MASTER-Tavrida | (08h 13m 23.62s , -15d 43m 22.1s) | C | 60 | 16.2 |
11814 | 2025-01-27 18:31:02 | MASTER-Tavrida | (08h 21m 47.72s , -15d 43m 57.5s) | C | 60 | 15.6 |
12055 | 2025-01-27 18:35:03 | MASTER-Tavrida | (08h 26m 29.58s , -13d 06m 57.8s) | C | 60 | 16.7 |
12130 | 2025-01-27 18:36:18 | MASTER-Tavrida | (08h 21m 06.92s , -14d 26m 52.0s) | C | 60 | 16.6 |
12204 | 2025-01-27 18:37:32 | MASTER-Tavrida | (08h 29m 25.66s , -14d 25m 12.6s) | C | 60 | 16.4 |
12373 | 2025-01-27 18:40:21 | MASTER-Tavrida | (08h 13m 22.75s , -15d 43m 40.8s) | C | 60 | 17.2 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 39055
Subject
GRB 250127B: DDOTI Upper Limit on the Afterglow
Date
2025-01-28T14:48:39Z (4 months ago)
From
Rosa L. Becerra at Tor Vergata, Roma <rosa.becerra@roma2.infn.it>
Via
Web form
Rosa L. Becerra (U Rome), Alan M. Watson (UNAM), Eleonora Troja (U Rome), Camila Angulo Valdez (UNAM), Nat Butler (ASU), Simone Dichiara (Penn State University), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Océlotl López (UNAM), and Margarita Pereyra (UNAM) report:
We observed the field of the GRB 250127B detected by Fermi/GBM (Fermi GBM Team, GCN 39046) with the DDOTI/OAN wide-field imager at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir (http://ddoti.astroscu.unam.mx) on 2025-01-28 from 10:24 to 10:53 UTC (19.2 to 19.7 hrs after the event). Our observations cover about the 70% of the error region (statistical only) down to a 10-sigma limiting magnitude of w = 20 AB mag.
Comparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogues, we
detect no uncatalogued sources within the observed field to our 10-sigma limit within the error radius reported by Fermi/GBM (Fermi GBM Team, GCN 39046). This upper limit is consistent with the non detection from the Global MASTER-Net (Lipunov et al., 2025, GCN 39049).
We thank the DDOTI technical team and the staff of the Observatorio Astronómico Nacional.