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

[vsnet-grb-info 41409] GRB 260101A: Swift/UVOT Detection
by GCN Circulars 04 Jan '26

04 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43318 SUBJECT: GRB 260101A: Swift/UVOT Detection DATE: 26/01/04 10:35:48 GMT FROM: noelklin(a)umbc.edu N. Klingler (NASA-GSFC / UMBC / CRESST II) and S. B. Cenko (GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 260101A 144 s after the BAT trigger (Cenko et al., GCN Circ. 43285). A source consistent with the enhanced XRT position (Evans et al., GCN Circ. 43289) is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 05:45:42.96 = 86.42898 (deg.) Dec (J2000) = +63:35:32.1 = 63.59226 (deg.) with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence). Detections and 2-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag b 399.7 419.5 19.8 16.57 +/- 0.10 b 548.6 568.4 19.8 16.74 +/- 0.11 b 697.4 717.1 19.7 16.80 +/- 0.11 b 847.1 866.9 19.8 17.20 +/- 0.14 b 1031.0 1200.3 169.3 17.50 +/- 0.11 b 1329.9 1498.6 168.7 17.69 +/- 0.12 b 1628.4 1648.2 19.8 17.81 +/- 0.18 b 21638.8 22547.2 908.4 21.07 +/- 0.27 u 144.3 394.1 249.8 16.09 +/- 0.05 u 523.8 543.5 19.7 16.44 +/- 0.13 u 672.6 692.3 19.7 17.15 +/- 0.18 u 822.4 842.1 19.7 16.97 +/- 0.16 u 875.8 1025.6 149.8 17.12 +/- 0.08 u 1155.7 1324.8 169.1 17.86 +/- 0.18 u 1454.1 1623.5 169.4 17.86 +/- 0.18 u 95366.4 96053.5 687.1 >21.51 v 450.4 470.2 19.8 16.17 +/- 0.14 v 599.0 618.8 19.8 15.87 +/- 0.12 v 747.6 767.4 19.8 16.28 +/- 0.15 v 1081.4 1251.3 169.9 16.98 +/- 0.15 v 1380.2 1549.5 169.3 17.23 +/- 0.17 v 11438.4 12223.4 785.0 19.27 +/- 0.14 v 27138.9 28046.0 907.1 20.55 +/- 0.38 uvw1 499.5 816.9 317.4 >19.48 uvw1 1131.1 1599.0 467.9 >19.74 uvw1 34121.1 34973.5 852.4 >21.44 uvw2 425.8 743.0 317.2 >19.43 uvw2 1057.0 1525.2 468.2 >19.72 uvw2 10532.3 11432.0 899.7 >21.06 uvw2 22553.7 23374.5 820.8 >21.39 uvw2 100888.2 101273.5 385.3 >20.96 uvm2 474.7 643.2 168.5 >18.78 uvm2 1105.7 1424.3 318.6 >18.80 uvm2 28051.2 28842.6 791.4 >21.25 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.197 in the direction of the burst (Schlegel et al. 1998). View this GCN Circular online at https://gcn.nasa.gov/circulars/43318. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41408] GRB 260103A: GECAM-B observation of a burst
by GCN Circulars 04 Jan '26

04 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43317 SUBJECT: GRB 260103A: GECAM-B observation of a burst DATE: 26/01/04 08:59:17 GMT FROM: Xinghao Luo at IHEP <2952704891(a)qq.com> GRB 260103A: GECAM-B observation of a burst Xing-Hao Luo, Chen-Wei Wang, Shao-Lin Xiong, Yue Huang (IHEP) report on behalf of GECAM team: GECAM-B was triggered in-flight by GRB 260103A, at 2026-01-03T01:46:53.950 UTC (denoted as T0), which is also detected by SVOM/GRM (Chen-Wei Wang et.al., GCN #43314). According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of multiple pulses with a duration (T90) of 9.0 +3.6/-7.0 s. The GECAM-B light curve can be found here: https://www.bursthub.cn//admin/static/gecambgrb260103A.png GECAM-B on-ground localization of this burst is (J2000): Ra: 269.0 deg Dec: 46.7 deg Err: 4.6 deg (1-sigma, statistical only) Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission originally consists of two micro-satellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS). View this GCN Circular online at https://gcn.nasa.gov/circulars/43317. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41407] GRB 260104B: Fermi GBM Final Localization
by GCN Circulars 04 Jan '26

04 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43316 SUBJECT: GRB 260104B: Fermi GBM Final Localization DATE: 26/01/04 07:50:23 GMT FROM: Rushikesh Sonawane at IISER, TVM <rushikesh23(a)iisertvm.ac.in> The Fermi GBM team reports the detection of a likely LONG GRB "At 05:49:57.62 UT on 04 January 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260104B (trigger 789198602/260104243). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 87.42, Dec = -29.65 (J2000 degrees, equivalent to J2000 05h 49m, -29d 39'), with a statistical uncertainty of 10.28 degrees. The angle from the Fermi LAT boresight is 42 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260104243/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260104243/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260104243/…" View this GCN Circular online at https://gcn.nasa.gov/circulars/43316. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41406] GRB 260104A: Swift detection of a burst
by GCN Circulars 04 Jan '26

04 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43315 SUBJECT: GRB 260104A: Swift detection of a burst DATE: 26/01/04 05:57:24 GMT FROM: K.L. Page at U Leicester <klp5(a)leicester.ac.uk> R. Caputo (GSFC), J. J. DeLaunay (PSU), K. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 05:37:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 260104A (trigger=1430212). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 337.415, -21.280 which is RA(J2000) = 22h 29m 40s Dec(J2000) = -21d 16' 48" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 20 sec. The peak count rate was ~2400 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 05:38:28.9 UT, 86.1 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 337.39898, -21.29547 which is equivalent to: RA(J2000) = 22h 29m 35.76s Dec(J2000) = -21d 17' 43.7" with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 77 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (3.40 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 2.8 (+2.48/-2.16) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 150 seconds with the White filter starting 90 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 none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.033. Burst Advocate for this burst is R. Caputo (regina.caputo AT nasa.gov) Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/) View this GCN Circular online at https://gcn.nasa.gov/circulars/43315. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41405] GRB 260103A: SVOM/GRM observation of a possible GRB
by GCN Circulars 03 Jan '26

03 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43314 SUBJECT: GRB 260103A: SVOM/GRM observation of a possible GRB DATE: 26/01/03 11:42:40 GMT FROM: Chenwei Wang at IHEP <cwwang(a)ihep.ac.cn> SVOM/GRM team: Chen-Wei Wang, Yue Huang, Shi-Jie Zheng, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Frédéric Piron (LUPM) Report on behalf of the SVOM team: SVOM/GRM was triggered in-flight by a burst GRB 260103A (SVOM trigger reference: sb26010302) at 2026-01-03T01:46:54.000 UTC (T0). With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of multiple pulses with a T90 of 8.0 +3.8/-1.8 s in the 15-5000 keV band. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb260103A.png We note that the burst occurred near the end of a C class solar flare as detected by the GOES satellites. So the solar flare origin cannot be excluded although this burst has a typical brightness, duration, and hardness of a long GRB. 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. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM point of contact for this burst is: Chen-Wei Wang(IHEP)(cwwang(a)ihep.ac.cn) View this GCN Circular online at https://gcn.nasa.gov/circulars/43314. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41404] Fermi-LAT Gamma-ray Observations of IceCube-251225A
by GCN Circulars 03 Jan '26

03 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43313 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-251225A DATE: 26/01/03 09:01:01 GMT FROM: Leo Pfeiffer at University of Würzburg <pfeiffer.leo(a)gmail.com> L. Pfeiffer (Univ. of Wuerzburg), S. Buson (DESY, Univ. of Wuerzburg) and S. Garrappa (Weizmann Institute of Science) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the high-energy IC251225A neutrino event (GCN 43239) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 25-12-25 at 20:14:06.80 UTC (T0) with J2000 position RA = 297.42 (+0.54, -0.49) deg, Decl. = 22.47 (+0.46, -0.48) deg 90% PSF containment (J2000). No cataloged gamma-ray sources are found within the 90% IC251225A localization error (4FGL-DR4; The Fourth Fermi-LAT catalog Data Release 4, The Fermi-LAT collaboration 2023, arXiv:2307.12546). We searched for the existence of intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (>5sigma) new excess emission (> 100 MeV) within the IC251225A 90% confidence localization. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC251225A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 1.9e-10 ph cm^-2 s^-1 for ~17-years (2008-08-04 / T0), <1.3e-08 (<2.2e-07) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0. Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this source will continue. For this analysis, the Fermi-LAT contact person is L. Pfeiffer (leonard.pfeiffer at uni-wuerzburg.de). The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. View this GCN Circular online at https://gcn.nasa.gov/circulars/43313. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41403] GRB 260101A: COLIBRÍ optical observations
by GCN Circulars 03 Jan '26

03 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43312 SUBJECT: GRB 260101A: COLIBRÍ optical observations DATE: 26/01/03 06:27:01 GMT FROM: globus(a)astro.unam.mx Noémie Globus (UNAM), Sarah Antier (IJCLAB), Alan M. Watson (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Jean-Luc Atteia (IRAP), Dalya Akl (NYUAD), Camila Angulo (UNAM), Rosa L. Becerra (UNAM), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Jean-Grégoire Ducoin (CPPM), Francis Fortin (IRAP), Leonardo García García (UNAM), Ramandeep Gill (UNAM), Nikos Mandarakas (LAM), Kin Ocelotl López (UNAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), Margarita Pereyra (UNAM), Ny Avo Rakotondrainibe (LAM), Fredd Sánchez Álvarez (UNAM), Benjamin Schneider (LAM) and Antonio de Ugarte Postigo (LAM), report: We observed the optical counterpart of the “New Year Burst”, GRB 260101A (Fermi GBM team, GCN Circ. 43284; Cenko et al., GCN Circ. 43285; Pérez-Fournon et al., GCN Circ. 43286; de Ugarte Postigo et al., GCN Circ. 43287; Beardmore et al., GCN Circ. 43289; Lipunov et al., GCN Circ. 43290; D'Avanzo et al., GCN Circ. 43291; SVOM/GRM team et al., GCN Circ. 43292; Saccardi et al., GCN Circ. 43293; Wang et al., GCN Circ. 43294; Hristov et al., GCN Circ. 43297) using the DDRAGO wide-field imager on the COLIBRÍ telescope. We observed from 2026-01-03 03:22 to 05:47 UTC (50.4 hours to 52.9 hours after the trigger) and obtained 105 minutes of simultaneous exposure in the r and z filters. The data were reduced and coadded with the COLIBRÍ ASU pipeline. The photometry was calibrated using nearby stars from the PanSTARRS DR1 catalog, is in the AB system, and is not corrected for Galactic extinction. In our stacked images, we detect a source at the position of the afterglow (Cenko et al., GCN Circ. 43285) at preliminary magnitudes of: r = 22.11 +/- 0.11, z = 21.47 +/- 0.09. We thank the staff of the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir and the COLIBRÍ and DDRAGO engineering teams. COLIBRÍ is an astronomical observatory developed and operated jointly by France (AMU, CNES and CNRS) and Mexico (UNAM and SECIHTI). It is located at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir, Baja California, Mexico. View this GCN Circular online at https://gcn.nasa.gov/circulars/43312. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41402] SVOM GRB260103.08: Global MASTER-Net observations report
by GCN Circulars 03 Jan '26

03 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43311 SUBJECT: SVOM GRB260103.08: Global MASTER-Net observations report DATE: 26/01/03 02:28:23 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) started inspect of the SVOM GRB260103.08 (trigger No 1767405296,10h 29m 22.85s , +78d 07m 01.2s, R=1) errorbox 9 sec after notice time and 47 sec after trigger time at 2026-01-03 01:55:42 UT, with upper limit up to 17.8 mag. The observations began at zenith distance = 36 deg. The sun altitude is -29.5 deg. The galactic latitude b = 37 deg., longitude l = 131 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3094431 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 52 | 2026-01-03 01:55:42 | MASTER-Kislovodsk | (10h 28m 21.31s , +78d 15m 14.6s) | C | 10 | 16.1 | 72 | 2026-01-03 01:55:42 | MASTER-Kislovodsk | (10h 28m 21.31s , +78d 15m 14.7s) | C | 50 | 17.2 | Coadd 52 | 2026-01-03 01:55:43 | MASTER-Kislovodsk | (10h 26m 28.30s , +78d 37m 51.0s) | P| | 10 | 15.1 | 88 | 2026-01-03 01:56:13 | MASTER-Kislovodsk | (10h 28m 20.71s , +78d 15m 17.8s) | C | 20 | 16.5 | 88 | 2026-01-03 01:56:13 | MASTER-Kislovodsk | (10h 26m 27.38s , +78d 37m 54.9s) | P| | 20 | 15.8 | 129 | 2026-01-03 01:56:54 | MASTER-Kislovodsk | (10h 28m 20.20s , +78d 15m 20.4s) | C | 20 | 16.4 | 129 | 2026-01-03 01:56:54 | MASTER-Kislovodsk | (10h 26m 26.58s , +78d 37m 57.6s) | P| | 20 | 15.7 | 174 | 2026-01-03 01:57:35 | MASTER-Kislovodsk | (10h 28m 19.34s , +78d 15m 23.0s) | C | 30 | 16.8 | 219 | 2026-01-03 01:57:35 | MASTER-Kislovodsk | (10h 28m 19.30s , +78d 15m 23.2s) | C | 120 | 17.5 | Coadd 174 | 2026-01-03 01:57:35 | MASTER-Kislovodsk | (10h 26m 25.67s , +78d 38m 00.3s) | P| | 30 | 15.9 | 229 | 2026-01-03 01:58:25 | MASTER-Kislovodsk | (10h 28m 18.65s , +78d 15m 25.6s) | C | 40 | 16.8 | 229 | 2026-01-03 01:58:25 | MASTER-Kislovodsk | (10h 26m 24.60s , +78d 38m 02.7s) | P| | 40 | 16.1 | 295 | 2026-01-03 01:59:25 | MASTER-Kislovodsk | (10h 28m 17.63s , +78d 15m 28.0s) | C | 50 | 16.9 | 295 | 2026-01-03 01:59:25 | MASTER-Kislovodsk | (10h 26m 23.54s , +78d 38m 04.8s) | P| | 50 | 16.2 | 375 | 2026-01-03 02:00:35 | MASTER-Kislovodsk | (10h 28m 16.24s , +78d 15m 30.2s) | C | 70 | 17.1 | 475 | 2026-01-03 02:00:35 | MASTER-Kislovodsk | (10h 28m 16.19s , +78d 15m 30.3s) | C | 270 | 17.8 | Coadd 375 | 2026-01-03 02:00:35 | MASTER-Kislovodsk | (10h 26m 22.26s , +78d 38m 06.6s) | P| | 70 | 16.4 | 475 | 2026-01-03 02:02:05 | MASTER-Kislovodsk | (10h 28m 14.77s , +78d 15m 32.1s) | C | 90 | 17.2 | 475 | 2026-01-03 02:02:05 | MASTER-Kislovodsk | (10h 26m 20.59s , +78d 38m 07.9s) | P| | 90 | 16.6 | 596 | 2026-01-03 02:03:56 | MASTER-Kislovodsk | (10h 28m 13.42s , +78d 15m 32.8s) | C | 110 | 17.3 | 596 | 2026-01-03 02:03:56 | MASTER-Kislovodsk | (10h 26m 18.31s , +78d 38m 08.2s) | P| | 110 | 16.4 | 731 | 2026-01-03 02:06:07 | MASTER-Kislovodsk | (10h 28m 13.42s , +78d 15m 32.8s) | C | 120 | 14.8 | 731 | 2026-01-03 02:06:07 | MASTER-Kislovodsk | (10h 26m 18.35s , +78d 38m 07.2s) | P| | 120 | 14.4 | 908 | 2026-01-03 02:09:34 | MASTER-Kislovodsk | (10h 34m 57.99s , +79d 17m 59.5s) | C | 60 | 17.0 | 908 | 2026-01-03 02:09:34 | MASTER-Kislovodsk | (10h 09m 58.98s , +79d 35m 40.7s) | C | 60 | 17.2 | 1008 | 2026-01-03 02:11:13 | MASTER-Kislovodsk | (10h 50m 24.38s , +77d 23m 12.9s) | C | 60 | 17.0 | 1008 | 2026-01-03 02:11:13 | MASTER-Kislovodsk | (10h 29m 13.06s , +77d 41m 41.3s) | C | 60 | 17.3 | 1113 | 2026-01-03 02:12:58 | MASTER-Kislovodsk | (10h 29m 26.49s , +78d 16m 54.1s) | C | 60 | 17.0 | 1113 | 2026-01-03 02:12:58 | MASTER-Kislovodsk | (10h 06m 36.99s , +78d 34m 43.4s) | C | 60 | 17.2 | 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/43311. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41401] GRB 260102B: Fermi GBM Final Real-time Localization
by GCN Circulars 02 Jan '26

02 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43310 SUBJECT: GRB 260102B: Fermi GBM Final Real-time Localization DATE: 26/01/02 21:23:33 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 SHORT GRB At 21:12:03 UT on 2 Jan 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260102B (trigger 789081128.373244 / 260102883). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 60.7, Dec = -67.8 (J2000 degrees, equivalent to J2000 04h 02m, -67d 47'), with a statistical uncertainty of 17.7 degrees. The angle from the Fermi LAT boresight is 23.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260102883/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260102883/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260102883/… View this GCN Circular online at https://gcn.nasa.gov/circulars/43310. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41400] SVOM GRB260102.17: Global MASTER-Net observations report
by GCN Circulars 02 Jan '26

02 Jan '26

TITLE: GCN CIRCULAR NUMBER: 43309 SUBJECT: SVOM GRB260102.17: Global MASTER-Net observations report DATE: 26/01/02 18:14:24 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 SVOM GRB260102.17 (trigger No 1767326986,12h 15m 31.27s , +48d 15m 29.9s, R=0.0849) errorbox 48331 sec after notice time and 48428 sec after trigger time at 2026-01-02 17:36:54 UT, with upper limit up to 15.1 mag. The observations began at zenith distance = 81 deg. The sun altitude is -41.1 deg. The galactic latitude b = 68 deg., longitude l = 138 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3093252 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 33488 | 2026-01-02 13:26:23 | MASTER- | (12h 20m 52.08s , +49d 49m 23.4s) | C | 180 | 17.3 | 48459 | 2026-01-02 17:36:54 | MASTER-Kislovodsk | (12h 14m 33.74s , +47d 55m 28.1s) | C | 60 | 15.1 | 50357 | 2026-01-02 18:08:32 | MASTER-Kislovodsk | (12h 14m 30.88s , +47d 52m 14.0s) | C | 60 | 15.5 | 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/43309. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0