January 2026 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 41469] GRB 260112A: Fermi GBM Final Real-time Localization
by GCN Circulars 12 Jan '26

12 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43376 SUBJECT: GRB 260112A: Fermi GBM Final Real-time Localization DATE: 26/01/12 05:36:31 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 05:25:50 UT on 12 Jan 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260112A (trigger 789888355.72541 / 260112226). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 326.5, Dec = -37.8 (J2000 degrees, equivalent to J2000 21h 45m, -37d 47'), with a statistical uncertainty of 18.3 degrees. The angle from the Fermi LAT boresight is 112.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260112226/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260112226/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260112226/… View this GCN Circular online at https://gcn.nasa.gov/circulars/43376. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41468] EP260110a: SVOM/VT optical upper limits
by GCN Circulars 12 Jan '26

12 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43375 SUBJECT: EP260110a: SVOM/VT optical upper limits DATE: 26/01/12 04:40:42 GMT FROM: Huali Li at at NAOC, SVOM <lhl(a)nao.cas.cn> H. L. Li, L. P. Xin, Y. L. Qiu, C. Wu, Y. N. Ma, Z. H. Yao, X. H. Han, J. Wang, P. P. Zhang, Y. Xu, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. R. Xu, J. S. Deng, J. Y. Wei (NAOC), J. Palmerio (CEA) report on behalf of the SVOM/VT team. SVOM/VT performed ToO observation on the fast X-ray transient EP260110a (Zhang et al., GCN 43363; 43367). The observation started on 2026-01-10T14:29:11 UT (i.e. 2.52 hour post trigger) in VT_B (400nm-650nm) and VT_R (650nm-1000nm) channel simultaneously. Inside the error box of the EP-FXT (Zhang et al., GCN 43367) we did not detect any new uncatalogued source, which was consistent with the non detections reported by other groups (Perez-Garcia et al., GCN 43364; Kang et al., GCN 43365; Antier et al., GCN 43366; Zheng et al., GCN 43368; Lipunov et al., GCN 43372). The 3 sigma limits in AB magnitude are derived as below: Mid time | Band | Exposure Time | 3 sigma limit magnitude 4.11 hour VT_B 52*70 sec > 23.5 4.64 hour VT_R 50*70 sec > 23.5 The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC), CAS. View this GCN Circular online at https://gcn.nasa.gov/circulars/43375. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41467] IceCube-260111A - IceCube observation of a high-energy neutrino candidate track-like event
by GCN Circulars 11 Jan '26

11 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43374 SUBJECT: IceCube-260111A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 26/01/11 22:48:41 GMT FROM: Giacomo Sommani at Ruhr-Universität Bochum <gsommani(a)icecube.wisc.edu> The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 26-01-11 at 20:10:33.91 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_BRONZE alert stream. The average astrophysical neutrino purity for Bronze alerts is 30%. This alert has an estimated false alarm rate of 0.7434 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection. After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/141893_3811884.amon) more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 26-01-11 Time: 20:10:33.91 UT RA: 70.88 (+1.55/-1.4 deg 90% PSF containment) J2000 Dec: 34.59 (+0.76/-0.64 deg 90% PSF containment) J2000 One gamma-ray source from the Fermi 4FGL-DR4 catalog is located within the 90% uncertainty region of this event: 4FGL J0444.6+3425, at RA = 71.16° and Dec = 34.42° (J2000), with an angular separation of 0.29° from the best-fit event position. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc(a)icecube.wisc.edu View this GCN Circular online at https://gcn.nasa.gov/circulars/43374. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41466] IceCube Alert 260111.84: Global MASTER-Net observations report
by GCN Circulars 11 Jan '26

11 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43373 SUBJECT: IceCube Alert 260111.84: Global MASTER-Net observations report DATE: 26/01/11 20:39:22 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, 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.Sosnovskij (CrAO), 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-Kislovodsk robotic telescope [1] located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the IceCube Alert 260111.84 (trigger No 3811884,04h 44m 30.72s , +35d 03m 43.2s, R=0.51) errorbox 12 sec after notice time and 58 sec after trigger time at 2026-01-11 20:11:32 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 21 deg. The sun altitude is -64.6 deg. MASTER-Tunka robotic telescope located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the IceCube Alert 260111.84 errorbox 26 sec after notice time and 72 sec after trigger time at 2026-01-11 20:11:46 UT, with upper limit up to 14.1 mag. The observations began at zenith distance = 61 deg. The sun altitude is -44.9 deg. MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) was pointed to the IceCube Alert 260111.84 errorbox 61 sec after notice time and 107 sec after trigger time at 2026-01-11 20:12:21 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 67 deg. The sun altitude is -24.8 deg. The galactic latitude b = -6 deg., longitude l = 168 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3100219 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 64 | 2026-01-11 20:11:32 | MASTER-Kislovodsk | (04h 43m 04.86s , +35d 34m 12.2s) | P| | 10 | 15.9 | 64 | 2026-01-11 20:11:32 | MASTER-Kislovodsk | (04h 43m 29.08s , +35d 12m 14.1s) | C | 10 | 16.9 | 89 | 2026-01-11 20:11:32 | MASTER-Kislovodsk | (04h 43m 29.08s , +35d 12m 14.1s) | C | 60 | 18.0 | Coadd 78 | 2026-01-11 20:11:46 | MASTER-Tunka | (04h 43m 38.90s , +35d 16m 36.1s) | P- | 10 | 14.1 | 78 | 2026-01-11 20:11:46 | MASTER-Tunka | (04h 43m 07.38s , +35d 23m 28.3s) | P| | 10 | 13.0 | 99 | 2026-01-11 20:12:02 | MASTER-Kislovodsk | (04h 43m 04.82s , +35d 34m 09.7s) | P| | 20 | 16.4 | 99 | 2026-01-11 20:12:02 | MASTER-Kislovodsk | (04h 43m 29.04s , +35d 12m 12.1s) | C | 20 | 17.4 | 118 | 2026-01-11 20:12:21 | MASTER-SAAO | (04h 42m 05.60s , +34d 48m 35.2s) | C | 20 | 18.0 | 153 | 2026-01-11 20:12:21 | MASTER-SAAO | (04h 42m 05.60s , +34d 48m 35.2s) | C | 90 | 18.9 | 118 | 2026-01-11 20:12:21 | MASTER-SAAO | (04h 40m 03.11s , +35d 04m 27.6s) | C | 20 | 17.8 | 153 | 2026-01-11 20:12:21 | MASTER-SAAO | (04h 40m 03.11s , +35d 04m 27.6s) | C | 90 | 18.8 | 145 | 2026-01-11 20:12:43 | MASTER-Kislovodsk | (04h 43m 28.95s , +35d 12m 09.1s) | C | 30 | 17.8 | 145 | 2026-01-11 20:12:43 | MASTER-Kislovodsk | (04h 43m 04.76s , +35d 34m 06.1s) | P| | 30 | 17.0 | 162 | 2026-01-11 20:13:01 | MASTER-SAAO | (04h 42m 05.86s , +34d 48m 37.9s) | C | 30 | 18.3 | 162 | 2026-01-11 20:13:01 | MASTER-SAAO | (04h 40m 03.42s , +35d 04m 31.2s) | C | 30 | 18.2 | 200 | 2026-01-11 20:13:33 | MASTER-Kislovodsk | (04h 43m 04.72s , +35d 34m 02.5s) | P| | 40 | 16.9 | 200 | 2026-01-11 20:13:33 | MASTER-Kislovodsk | (04h 43m 28.88s , +35d 12m 06.2s) | C | 40 | 17.9 | 255 | 2026-01-11 20:13:33 | MASTER-Kislovodsk | (04h 43m 28.89s , +35d 12m 06.1s) | C | 150 | 18.7 | Coadd 216 | 2026-01-11 20:13:49 | MASTER-SAAO | (04h 42m 06.14s , +34d 48m 40.7s) | C | 40 | 18.4 | 216 | 2026-01-11 20:13:50 | MASTER-SAAO | (04h 40m 03.68s , +35d 04m 34.5s) | C | 40 | 18.2 | 265 | 2026-01-11 20:14:33 | MASTER-Kislovodsk | (04h 43m 04.64s , +35d 33m 58.2s) | P| | 50 | 17.1 | 265 | 2026-01-11 20:14:33 | MASTER-Kislovodsk | (04h 43m 28.78s , +35d 12m 02.4s) | C | 50 | 18.0 | 280 | 2026-01-11 20:14:49 | MASTER-SAAO | (04h 42m 06.49s , +34d 48m 43.7s) | C | 50 | 18.5 | 280 | 2026-01-11 20:14:49 | MASTER-SAAO | (04h 40m 03.97s , +35d 04m 38.1s) | C | 50 | 18.4 | 341 | 2026-01-11 20:15:44 | MASTER-Kislovodsk | (04h 43m 28.69s , +35d 11m 58.8s) | C | 60 | 18.2 | 341 | 2026-01-11 20:15:44 | MASTER-Kislovodsk | (04h 43m 04.53s , +35d 33m 54.1s) | P| | 60 | 17.4 | 354 | 2026-01-11 20:15:58 | MASTER-SAAO | (04h 42m 06.82s , +34d 48m 46.7s) | C | 60 | 18.8 | 354 | 2026-01-11 20:15:58 | MASTER-SAAO | (04h 40m 04.29s , +35d 04m 41.7s) | C | 60 | 18.5 | 432 | 2026-01-11 20:17:05 | MASTER-Kislovodsk | (04h 43m 04.39s , +35d 33m 49.7s) | P| | 80 | 17.4 | 432 | 2026-01-11 20:17:05 | MASTER-Kislovodsk | (04h 43m 28.56s , +35d 11m 55.0s) | C | 80 | 18.4 | 542 | 2026-01-11 20:17:05 | MASTER-Kislovodsk | (04h 43m 28.56s , +35d 11m 54.9s) | C | 300 | 19.2 | Coadd 433 | 2026-01-11 20:17:17 | MASTER-SAAO | (04h 42m 07.12s , +34d 48m 50.4s) | C | 60 | 18.7 | 433 | 2026-01-11 20:17:17 | MASTER-SAAO | (04h 40m 04.61s , +35d 04m 45.6s) | C | 60 | 18.6 | 513 | 2026-01-11 20:18:36 | MASTER-SAAO | (04h 42m 07.48s , +34d 48m 53.0s) | C | 60 | 18.8 | 513 | 2026-01-11 20:18:36 | MASTER-SAAO | (04h 40m 04.97s , +35d 04m 48.8s) | C | 60 | 18.6 | 552 | 2026-01-11 20:18:56 | MASTER-Kislovodsk | (04h 43m 28.37s , +35d 11m 50.5s) | C | 100 | 18.4 | 552 | 2026-01-11 20:18:56 | MASTER-Kislovodsk | (04h 43m 04.21s , +35d 33m 44.7s) | P| | 100 | 17.6 | 592 | 2026-01-11 20:19:55 | MASTER-SAAO | (04h 42m 07.81s , +34d 48m 55.7s) | C | 60 | 18.8 | 592 | 2026-01-11 20:19:55 | MASTER-SAAO | (04h 40m 05.29s , +35d 04m 51.9s) | C | 60 | 18.6 | 683 | 2026-01-11 20:20:56 | MASTER-Kislovodsk | (04h 43m 04.05s , +35d 33m 39.6s) | P| | 120 | 17.6 | 683 | 2026-01-11 20:20:56 | MASTER-Kislovodsk | (04h 43m 28.20s , +35d 11m 46.1s) | C | 120 | 18.4 | 671 | 2026-01-11 20:21:14 | MASTER-SAAO | (04h 42m 08.14s , +34d 48m 58.6s) | C | 60 | 18.8 | 671 | 2026-01-11 20:21:14 | MASTER-SAAO | (04h 40m 05.62s , +35d 04m 55.0s) | C | 60 | 18.7 | 750 | 2026-01-11 20:22:33 | MASTER-SAAO | (04h 42m 08.48s , +34d 49m 01.7s) | C | 60 | 18.8 | 750 | 2026-01-11 20:22:33 | MASTER-SAAO | (04h 40m 05.95s , +35d 04m 58.4s) | C | 60 | 18.6 | 833 | 2026-01-11 20:23:27 | MASTER-Kislovodsk | (04h 43m 27.94s , +35d 11m 41.5s) | C | 120 | 18.5 | 840 | 2026-01-11 20:23:33 | MASTER-Kislovodsk | (04h 43m 03.83s , +35d 33m 33.8s) | P| | 120 | 17.8 | 829 | 2026-01-11 20:23:52 | MASTER-SAAO | (04h 42m 08.82s , +34d 49m 04.0s) | C | 60 | 18.8 | 829 | 2026-01-11 20:23:52 | MASTER-SAAO | (04h 40m 06.27s , +35d 05m 01.0s) | C | 60 | 18.6 | 981 | 2026-01-11 20:25:54 | MASTER-Kislovodsk | (04h 43m 03.62s , +35d 33m 28.6s) | P| | 120 | 17.6 | 981 | 2026-01-11 20:25:54 | MASTER-Kislovodsk | (04h 43m 27.69s , +35d 11m 36.9s) | C | 120 | 18.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/43373. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41465] EP260110a: Global MASTER-Net observations report
by GCN Circulars 11 Jan '26

11 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43372 SUBJECT: EP260110a: Global MASTER-Net observations report DATE: 26/01/11 19:09:24 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, 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.Sosnovskij (CrAO), 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-Kislovodsk robotic telescope [1] located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the EP260110a ( EP Team et al., GCN 43363) errorbox 1 days 21876 sec after notice time and 1 days 25310 sec after trigger time at 2026-01-11 18:58:48 UT, with upper limit up to 17.6 mag. The observations began at zenith distance = 62 deg. The sun altitude is -54.1 deg. The galactic latitude b = 51 deg., longitude l = 118 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3099928 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 111800 | 2026-01-11 18:58:48 | MASTER-Kislovodsk | (13h 17m 27.89s , +65d 50m 39.1s) | C | 180 | 16.4 | 111800 | 2026-01-11 18:58:48 | MASTER-Kislovodsk | (13h 17m 45.69s , +65d 27m 35.9s) | C | 180 | 17.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/43372. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41464] Fermi GRB 260111A: Global MASTER-Net observations report
by GCN Circulars 11 Jan '26

11 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43371 SUBJECT: Fermi GRB 260111A: Global MASTER-Net observations report DATE: 26/01/11 17:15:39 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, 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.Sosnovskij (CrAO), 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-Tunka robotic telescope [1] located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 260111A ( Fermi GBM team, GCN 43370) errorbox 201 sec after notice time and 236 sec after trigger time at 2026-01-11 16:37:10 UT, with upper limit up to 19.5 mag. The observations began at zenith distance = 70 deg. The sun altitude is -59.9 deg. The galactic latitude b = 56 deg., longitude l = 85 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3100149 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 262 | 2026-01-11 16:37:10 | MASTER-Tunka | (14h 52m 29.86s , +46d 07m 42.6s) | C | 50 | 17.8 | 262 | 2026-01-11 16:37:10 | MASTER-Tunka | (14h 52m 01.47s , +46d 14m 15.0s) | C | 50 | 18.3 | 320 | 2026-01-11 16:38:04 | MASTER-Tunka | (14h 52m 01.36s , +46d 14m 14.7s) | C | 60 | 18.5 | 320 | 2026-01-11 16:38:04 | MASTER-Tunka | (14h 52m 29.78s , +46d 07m 43.0s) | C | 60 | 18.1 | 384 | 2026-01-11 16:39:07 | MASTER-Tunka | (14h 52m 01.23s , +46d 14m 15.1s) | C | 60 | 18.3 | 384 | 2026-01-11 16:39:07 | MASTER-Tunka | (14h 52m 29.72s , +46d 07m 43.8s) | C | 60 | 18.0 | 607 | 2026-01-11 16:42:51 | MASTER-Tunka | (14h 58m 24.98s , +50d 10m 13.5s) | C | 60 | 18.8 | 667 | 2026-01-11 16:42:51 | MASTER-Tunka | (14h 58m 24.98s , +50d 10m 13.5s) | C | 180 | 19.5 | Coadd 607 | 2026-01-11 16:42:51 | MASTER-Tunka | (14h 58m 56.47s , +50d 03m 31.9s) | C | 60 | 18.4 | 670 | 2026-01-11 16:43:54 | MASTER-Tunka | (14h 58m 56.32s , +50d 03m 33.3s) | C | 60 | 18.4 | 670 | 2026-01-11 16:43:54 | MASTER-Tunka | (14h 58m 24.82s , +50d 10m 13.4s) | C | 60 | 18.7 | 734 | 2026-01-11 16:44:58 | MASTER-Tunka | (14h 58m 24.70s , +50d 10m 13.5s) | C | 60 | 18.7 | 734 | 2026-01-11 16:44:58 | MASTER-Tunka | (14h 58m 56.28s , +50d 03m 33.8s) | C | 60 | 18.3 | 797 | 2026-01-11 16:46:01 | MASTER-Tunka | (14h 58m 24.72s , +50d 10m 13.7s) | C | 60 | 18.6 | 797 | 2026-01-11 16:46:01 | MASTER-Tunka | (14h 58m 56.30s , +50d 03m 33.8s) | C | 60 | 18.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/43371. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41463] GRB 260111A: Fermi GBM Final Real-time Localization
by GCN Circulars 11 Jan '26

11 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43370 SUBJECT: GRB 260111A: Fermi GBM Final Real-time Localization DATE: 26/01/11 16:43:36 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 16:33:14 UT on 11 Jan 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260111A (trigger 789841999.012866 / 260111690). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 224.7, Dec = 50.4 (J2000 degrees, equivalent to J2000 14h 58m, 50d 23'), with a statistical uncertainty of 2.7 degrees. The angle from the Fermi LAT boresight is 12.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260111690/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260111690/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260111690/… View this GCN Circular online at https://gcn.nasa.gov/circulars/43370. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41462] Swift trigger 1436759 is not an astrophysical event
by GCN Circulars 11 Jan '26

11 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43369 SUBJECT: Swift trigger 1436759 is not an astrophysical event DATE: 26/01/11 09:22:31 GMT FROM: K.L. Page at U Leicester <klp5(a)leicester.ac.uk> R. Brivio (INAF-OAB), A. Mei (INAF-OAB), K. L. Page (U Leicester), T. M. Parsotan (GSFC), C. Salvaggio (INAF-OAB), B. Sbarufatti (INAF-OAB) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: The downlinked data showed no obvious light curve structure, and the lack of the scaled map at the time prevented full verification of the low image significance of the event in the BAT data. The XRT began observing the field at 09:03:15.2 UT, 112.0 seconds after the BAT trigger. No source was detected in 930 s of promptly downlinked data. UVOT took a finding chart exposure of 250 seconds with the U filter starting 172 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle. The typical 3-sigma upper limit has been about 19.2 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.111. View this GCN Circular online at https://gcn.nasa.gov/circulars/43369. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41461] EP260110a: KAIT optical upper limit
by GCN Circulars 11 Jan '26

11 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43368 SUBJECT: EP260110a: KAIT optical upper limit DATE: 26/01/11 06:29:36 GMT FROM: Weikang Zheng at UC Berkeley <weikang(a)berkeley.edu> WeiKang Zheng (UCB), Xuhui Han (NAOC), Pinpin Zhang (NAOC) and Alexei V. Filippenko (UCB) report on behalf of the KAIT GRB team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, observed the field of EP260110a (Zhang et al., GCN 43363; 43367) starting at 12:19, Jan 10 UT, about 21 minutes after the burst. A set of 20s, 40s and 60s clear (roughly R) filter images were obtained. In our coadd image, we did not detect any new source within the EP-WXT error circle (Zhang et al., GCN 43367) down to a limiting mag of 21.0 mag (Vega) at a mid-time of 1.0 hours after the burst. Our result is consistent with the upper limit reported by other groups (Perez-Garcia et al., GCN 43364; Kang et al., GCN 43365; Antier et al., GCN43366). View this GCN Circular online at https://gcn.nasa.gov/circulars/43368. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41460] EP260110a: refined analysis of the EP-WXT and EP-FXT observations
by GCN Circulars 11 Jan '26

11 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43367 SUBJECT: EP260110a: refined analysis of the EP-WXT and EP-FXT observations DATE: 26/01/11 04:43:42 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> B. Zhang, J. P. Feng (USTC), Y. Wu (NJU), F. F. Song(YNAO, CAS), A. Li (BNU), C. Y. Wang (THU), G. Y. Zhao (SYSU), Y. Liu (NAOC, CAS) on behalf of the Einstein Probe (EP) team: The fast X-ray transient EP260110a was detected by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission (Zhang et al., GCN 43363). The refined analysis of the WXT data shows that the event started at T0=2026-01-10T 11:56:58(UTC), and lasted for approximately 85 seconds, after which the WXT light curve was interrupted due to the autonomous follow-up observation. The average WXT 0.5-4 keV spectrum can be fitted with an absorbed power law with a fixed Galactic hydrogen column density of 1.59×10^20 cm^-2 and a photon index of 0.83(-0.51/+0.56). The derived average unabsorbed 0.5-4 keV flux is 2.64(-0.88/+1.15)×10^(-10) erg/s/cm^2. The Follow-up X-ray Telescope (FXT) on board EP observed this source autonomously at 2026-01-10T12:00:52(UTC, T0+234 s). The exposure time of this observation is 4576s. On-ground analysis of the FXT data found an uncatalogued source at R.A. = 199.4321, DEC = 65.8490 (J2000) with an uncertainty of about 10 arcsec (radius, 90% C.L. statistical and systematic), which is consistent with the WXT position. The average 0.5-10 keV spectrum can be fitted with an absorbed power law with a fixed Galactic hydrogen column density of 1.59×10^20 cm^-2 and a photon index of 2.02 (-0.14/+0.14). The derived average unabsorbed 0.5-10 keV flux is 1.52 (-0.19/+0.22)×10^(-12) erg/s/cm^2. We performed one target-of-opportunity (ToO) follow-up observations with FXT at 2026-01-10T16:23:31 (UTC, T0+15,993 s) with an exposure time of 3,032s. The average FXT 0.5-10 keV spectrum of the ToO observation can be fitted with an absorbed power law, with a fixed Galactic hydrogen column density of 1.59×10^20 cm^-2, and a photon index of 2.11 (-0.84/+1.00) . The derived average unabsorbed 0.5-10 keV flux is 1.15 (-0.57/+1.33)×10^(-13) erg/s/cm^2. The uncertainties are at the 90% confidence level for the above parameters. No optical counterpart of EP260110a has been detected so far (Perez-Garcia et al., GCN 43364; Kang et al., GCN 43365; Antier et al., GCN43366) , and further mutil-band follow-up observations are encouraged to explore the nature of EP260110a. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). View this GCN Circular online at https://gcn.nasa.gov/circulars/43367. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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