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[vsnet-grb-info 41155] Fermi-LAT Gamma-ray Observations of IceCube-251210A
by GCN Circulars 12 Dec '25

12 Dec '25

TITLE: GCN CIRCULAR NUMBER: 43075 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-251210A DATE: 25/12/12 09:04:29 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 IC251210A neutrino event (GCN 43064) 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 25-12-10 at 11:06:14.40 UTC (T0) with J2000 position RA = 35.29 (+0.68, -0.69) deg, Decl. = 20.34 (+0.64, -0.71) deg 90% PSF containment (J2000). No cataloged gamma-ray sources are found within the 90% IC251210A 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 IC251210A 90% confidence localization. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC251210A best-fit position, the >100 MeV flux upper limit (95% confidence) is <2.2e-10 ph cm^-2 s^-1 for ~17-years (2008-08-04 / T0), <1.5e-08 (<9.1e-08) 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/43075. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41154] IceCube-251210A: Upper limits from a search for additional neutrino events in IceCube
by GCN Circulars 12 Dec '25

12 Dec '25

TITLE: GCN CIRCULAR NUMBER: 43074 SUBJECT: IceCube-251210A: Upper limits from a search for additional neutrino events in IceCube DATE: 25/12/12 05:49:23 GMT FROM: Sam Hori at IceCube/U Wisc-Madison <sahori(a)wisc.edu> The IceCube Collaboration (http://icecube.wisc.edu/) reports: IceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-251210A (https://gcn.nasa.gov/circulars/43064) in a time range of 1000 seconds centered on the alert event time (2025-12-10 10:57:54.429 UTC to 2025-12-10 11:14:34.429 UTC) during which IceCube was collecting good quality data. Excluding the event that prompted the alert, zero track-like events are found within the 90% containment region of IceCube-251210A. We report a p-value of 1.00 in this time window. IceCube’s sensitivity to neutrino point sources with an E^-2.5 spectrum, expressed as E^2 dN/dE evaluated at 1 TeV, is 1.4e-01 GeV cm^-2 within the 90% spatial containment region of IceCube-251210A in a 1000 second time window. 90% of events IceCube would detect from a source at this declination with an E^-2.5 spectrum have energies in the approximate energy range between 2e+02 GeV and 9e+04 GeV. A subsequent search was performed including 2 days of data centered on the alert event time (2025-12-09 11:06:14.429 UTC to 2025-12-11 11:06:14.429 UTC). In this case, we report a p-value of 1.00, consistent with no significant excess of track events. IceCube’s sensitivity to neutrino point sources with an E^-2.5 spectrum, expressed as E^2 dN/dE evaluated at 1 TeV, is 1.7e-01 GeV cm^-2 within the 90% spatial containment region of IceCube-251210A in a 2 day time window. 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. [1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021) View this GCN Circular online at https://gcn.nasa.gov/circulars/43074. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41153] Fermi GRB 251211B: Global MASTER-Net observations report
by GCN Circulars 12 Dec '25

12 Dec '25

TITLE: GCN CIRCULAR NUMBER: 43073 SUBJECT: Fermi GRB 251211B: Global MASTER-Net observations report DATE: 25/12/12 00:15:55 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 251211B ( Fermi GBM team, GCN 43072) errorbox 622 sec after notice time and 629 sec after trigger time at 2025-12-11 20:42:33 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 72 deg. The sun altitude is -39.1 deg. The galactic latitude b = 48 deg., longitude l = 279 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3068576 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 643 | 2025-12-11 20:42:33 | MASTER-Tunka | (11h 44m 16.21s , -11d 00m 25.5s) | C | 25 | 16.9 | 665 | 2025-12-11 20:42:33 | MASTER-Tunka | (11h 44m 16.21s , -11d 00m 25.6s) | C | 70 | 17.5 | Coadd 671 | 2025-12-11 20:43:02 | MASTER-Tunka | (11h 44m 16.37s , -11d 00m 25.6s) | C | 25 | 16.9 | 697 | 2025-12-11 20:43:30 | MASTER-Tunka | (11h 44m 16.51s , -11d 00m 25.3s) | C | 20 | 16.8 | 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/43073. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41152] GRB 251211B: Fermi GBM Final Real-time Localization
by GCN Circulars 11 Dec '25

11 Dec '25

TITLE: GCN CIRCULAR NUMBER: 43072 SUBJECT: GRB 251211B: Fermi GBM Final Real-time Localization DATE: 25/12/11 20:42:26 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 20:32:04 UT on 11 Dec 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251211B (trigger 787177929.268096 / 251211856). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 176.2, Dec = -11.6 (J2000 degrees, equivalent to J2000 11h 44m, -11d 35'), with a statistical uncertainty of 4.5 degrees. The angle from the Fermi LAT boresight is 56.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251211856/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251211856/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251211856/… View this GCN Circular online at https://gcn.nasa.gov/circulars/43072. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41151] IceCube-251210A: DDOTI Optical Upper Limit
by GCN Circulars 11 Dec '25

11 Dec '25

TITLE: GCN CIRCULAR NUMBER: 43071 SUBJECT: IceCube-251210A: DDOTI Optical Upper Limit DATE: 25/12/11 05:40:15 GMT FROM: Rosa Leticia Becerra at Instituto de Astronomía, UNAM <rbecerra(a)astro.unam.mx> Rosa L. Becerra (UNAM), Simone Dichiara (Penn State University), Alan M. Watson (UNAM), Camila Angulo Valdez (UNAM), Nat Butler (ASU), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Océlotl López (UNAM), Margarita Pereyra (UNAM) and Eleonora Troja (U Roma) report: We observe the field of the IceCube-251210A (gold) event (IceCube Collaboration, GCN Circ. 43064) with the DDOTI/OAN wide-field imager at the Observatorio Astronómico Nacional on the Sierra of San Pedro Martir (http://ddoti.astroscu.unam.mx) on the night of 2025-12-11 UTC. DDOTI observed from 01:54 UTC to 04:34 UTC (T+14.8 h to T+17.5 h after the trigger), with a total exposure time of 81 minutes, covering the entire error region reported by IceCube (IceCube Collaboration, GCN Circ. 43064). Comparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogues, we detect no uncatalogued or credible fading sources within the observed field to a 10-sigma limiting AB magnitude of: w > 20.5 Further observations are planned to assess variability. This value is not corrected for the Galactic extinction. We thank the staff of the Observatorio Astronómico Nacional on the Sierra of San Pedro Mártir View this GCN Circular online at https://gcn.nasa.gov/circulars/43071. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41150] SVOM GRB251211.12: Global MASTER-Net observations report
by GCN Circulars 11 Dec '25

11 Dec '25

TITLE: GCN CIRCULAR NUMBER: 43070 SUBJECT: SVOM GRB251211.12: Global MASTER-Net observations report DATE: 25/12/11 03:00:33 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-OAFA robotic telescope [1] located in Argentina (OAFA observatory of San Juan National University) started inspect of the SVOM GRB251211.12 (trigger No 1765421306,03h 46m 48.22s , +23d 45m 06.5s, R=1) errorbox 27 sec after notice time and 61 sec after trigger time at 2025-12-11 02:49:27 UT, with upper limit up to 18.7 mag. The observations began at zenith distance = 55 deg. The sun altitude is -31.1 deg. The galactic latitude b = -23 deg., longitude l = 167 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3067906 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 67 | 2025-12-11 02:49:27 | MASTER-OAFA | (03h 47m 09.45s , +23d 52m 13.3s) | C | 10 | 18.7 | 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/43070. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41149] GRB 251211A: Fermi GBM Final Real-time Localization
by GCN Circulars 11 Dec '25

11 Dec '25

TITLE: GCN CIRCULAR NUMBER: 43069 SUBJECT: GRB 251211A: Fermi GBM Final Real-time Localization DATE: 25/12/11 02:51:35 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 02:40:59 UT on 11 Dec 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251211A (trigger 787113664.18548 / 251211112). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 181.9, Dec = -32.3 (J2000 degrees, equivalent to J2000 12h 07m, -32d 17'), with a statistical uncertainty of 6.4 degrees. The angle from the Fermi LAT boresight is 28.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251211112/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251211112/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251211112/… View this GCN Circular online at https://gcn.nasa.gov/circulars/43069. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41148] GRB 251209A: Fermi GBM observation
by GCN Circulars 10 Dec '25

10 Dec '25

TITLE: GCN CIRCULAR NUMBER: 43068 SUBJECT: GRB 251209A: Fermi GBM observation DATE: 25/12/10 22:23:56 GMT FROM: Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi(a)ba.infn.it> E. Bissaldi (Politecnico and INFN Bari) reports on behalf of the Fermi GBM Team: "At 13:24:03.99 UT on 9 December 2025, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 251209A (trigger 786979448 / 251209558). The Fermi GBM Final Real-time Localization is reported in GCN 43048. The angle from the Fermi LAT boresight at the GBM trigger time is 52 degrees. The GBM light curve consists of several structured emission episodes with a duration (T90) of about 57 s (50-300 keV). The time-averaged spectrum from T0-4 s to T0+81 s is best fit by a Band function with Epeak = 105 +/- 4 keV, alpha = -1.63 +/- 0.01, and beta = -2.37 +/- 0.06. The event fluence (10-1000 keV) in this time interval is (6.89 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+49.7 s in the 10-1000 keV band is 38.4 +/- 0.6 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/" View this GCN Circular online at https://gcn.nasa.gov/circulars/43068. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41147] GRB 251205A: 1.3m DFOT optical upper limit
by GCN Circulars 10 Dec '25

10 Dec '25

TITLE: GCN CIRCULAR NUMBER: 43067 SUBJECT: GRB 251205A: 1.3m DFOT optical upper limit DATE: 25/12/10 20:44:22 GMT FROM: ANSHIKA GUPTA at ARIES <anshika05180(a)gmail.com> Anshika Gupta, Debalina Kar, Koshvendra Singh, Dhruv Jain, Pankaj Pawar, and Kuntal Misra (ARIES) report: We observed the field of GRB 251205A detected by Swift (Lanava et al. 2025, GCN 43005) with the 1.3m Devasthal Fast Optical Telescope (DFOT), located at the Devasthal Observatory of the Aryabhatta Research Institute of Observational Sciences (ARIES), India. The observations were started on 2025-12-09 at 23:15:22.00 UT, i.e., ~ 3.98 days after the Swift trigger. We have taken multiple frames with an exposure time of 300s in the R filter. We stacked the images after the alignment. We could not detect the optical emission in our stacked image within the error box of Swift/UVOT (Lanava et al. 2025, GCN 43005). We obtain the following 3-sigma upper limit in the stacked image: Date Start_UT T_start-T0 (Days) Filter Exp time (s) Magnitude =============================================================== 2025-12-09 23:15:22.00 ~3.98 R 300s*11 >22.9 The non-detection of the burst is consistent with (Lipunov et al. 2025, GCN 43004; Lanava et al. 2025, GCN 43005; Lipunov et al. 2025, GCN 43006; de Ugarte Postigo et al. 2025, GCN 43008; Malesani et al. 2025, GCN 43009; O’Neill et al. 2025, GCN 43010; Mandarakas et al. 2025, GCN 43011; Pankov et al. 2025, GCN 43012; Bochenek et al. 2025, GCN 43015; Klinger et al. 2025, GCN 43016; Patil et al. 2025, GCN 43019; Pérez-Fournon et al. 2025, GCN 43020; Bochenek et al. 2025, GCN 43024; Busmann et al. 2025, GCN 43026; Hagio et al. 2025, GCN 43029; Bochenek et al. 2025, GCN 43038; Mo et al. 2025, GCN 43044). The magnitude is not corrected for the Galactic extinction in the direction of the burst. Photometric calibration is performed using the standard stars from the USNO-B1.0 catalogue. View this GCN Circular online at https://gcn.nasa.gov/circulars/43067. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41146] GRB 251209A: AstroSat CZTI detection
by GCN Circulars 10 Dec '25

10 Dec '25

TITLE: GCN CIRCULAR NUMBER: 43066 SUBJECT: GRB 251209A: AstroSat CZTI detection DATE: 25/12/10 16:59:18 GMT FROM: Anuraag Arya at IIT Bombay <aryaanuraag910(a)gmail.com> M. Tembhurnikar (IUCAA), S. Salunke (IUCAA), Harsha K. H. (IUCAA), A. Arya (IITB), A. Goyal (IITB), G. Waratkar (Caltech/IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long, bright GRB 251209A which was also detected by Fermi GBM (Fermi GBM Team, GCN Circ. 43048). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2025-12-09 13:24:31.50 UTC. The measured peak count rate associated with the burst is 358 (+38, -34) counts/s above the background in the combined data of three quadrants (out of four), with a total of 5908 (+328, -277) counts. The local mean background count rate was 208 (+1, -2) counts/s. Using cumulative rates, we measure a T90 of 38 (+4, -3) s. In the preliminary analysis, we find 594 Compton events associated with this event. The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2025-12-09 13:24:35.75 UTC. The measured peak count rate associated with the burst is 435 (+68, -32) counts/s above the background in the combined data of all quadrants, with a total of 6675 (+484, -624) counts. The local mean background count rate was 1160 (+3, -3) counts/s. We measure a T90 of 33 (+5, -3) s from the cumulative Veto light curve. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb View this GCN Circular online at https://gcn.nasa.gov/circulars/43066. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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