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

[vsnet-grb-info 41899] GRB 260219A: AstroSat CZTI detection
by GCN Circulars 21 Feb '26

21 Feb '26

TITLE: GCN CIRCULAR NUMBER: 43789 SUBJECT: GRB 260219A: AstroSat CZTI detection DATE: 26/02/21 09:34:45 GMT FROM: Anuraag Arya at IIT Bombay <aryaanuraag910(a)gmail.com> M. Tembhurnikar (IUCAA), Harsha K. H. (IUCAA), S. Salunke (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,faint GRB 260219A which was also detected by Fermi GBM (Fermi GBM Team., GCN Circ. 43785), and GECAM-B (Jin-Peng Zhang et al., GCN Circ. 43787). The source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2026-02-19 14:04:53.66 UTC. The measured peak count rate associated with the burst is 345 (+63, -68) counts/s above the background in the combined data of all quadrants, with a total of 974 (+218, -254) counts. The local mean background count rate was 1127 (+7, -7) counts/s. We measure a T90 of 6.8 (+1.6, -1.3) 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/43789. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41898] IceCube-260217A: Upper limits from a search for additional neutrino events in IceCube
by GCN Circulars 20 Feb '26

20 Feb '26

TITLE: GCN CIRCULAR NUMBER: 43788 SUBJECT: IceCube-260217A: Upper limits from a search for additional neutrino events in IceCube DATE: 26/02/20 22:37:41 GMT FROM: syan079(a)icecube.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-260217A (https://gcn.nasa.gov/circulars/43768) in a time range of 1000 seconds centered on the alert event time (2026-02-17 05:47:04.510 UTC to 2026-02-17 06:03:44.510 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-260217A. 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-260217A 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 1e+05 GeV. A subsequent search was performed including 2 days of data centered on the alert event time (2026-02-16 05:55:24.510 UTC to 2026-02-18 05:55:24.510 UTC). In this case, we report a p-value of 0.014, 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 1.6e-01 GeV cm^-2 within the 90% spatial containment region of IceCube-260217A 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/43788. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41897] GRB 260219A: GECAM-B observation of a long burst
by GCN Circulars 20 Feb '26

20 Feb '26

TITLE: GCN CIRCULAR NUMBER: 43787 SUBJECT: GRB 260219A: GECAM-B observation of a long burst DATE: 26/02/20 11:47:59 GMT FROM: zhangjinpeng(a)ihep.ac.cn Jin-Peng Zhang, Chen-Wei Wang, Shao-Lin Xiong (IHEP) report on behalf of GECAM team: GECAM-B was triggered in-flight by GRB 260219A, at 2026-02-19T14:04:54.600 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #43785). According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of one pulse, with a duration (T90) of 13 +/- 4 s. The GECAM-B light curve can be found here: https://www.bursthub.cn//admin/static/gecambgrb260219A.png The time-averaged spectrum from T0 - 1.0 to T0 + 13.0 s (photon energy > 70 keV) is fitted by a power law function. The power law index is -2.16 +0.14/-0.16. The event fluence (10-1000 keV) in this time interval is (7.7 +0.9/-1.1)E-06 erg/cm^2. 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/43787. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41896] Fermi GRB 260219A: Global MASTER-Net observations report
by GCN Circulars 19 Feb '26

19 Feb '26

TITLE: GCN CIRCULAR NUMBER: 43786 SUBJECT: Fermi GRB 260219A: Global MASTER-Net observations report DATE: 26/02/19 18:36:32 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 260219A ( Fermi GBM team, GCN 43785) errorbox 8595 sec after notice time and 8760 sec after trigger time at 2026-02-19 16:30:53 UT, with upper limit up to 19.8 mag. The observations began at zenith distance = 44 deg. The sun altitude is -49.0 deg. The galactic latitude b = 61 deg., longitude l = 245 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3145377 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 8790 | 2026-02-19 16:30:53 | MASTER-Tunka | (11h 07m 54.97s , +13d 08m 20.3s) | C | 60 | 19.0 | 8790 | 2026-02-19 16:30:53 | MASTER-Tunka | (11h 07m 34.84s , +13d 15m 31.6s) | C | 60 | 19.0 | 9759 | 2026-02-19 16:47:02 | MASTER-Tunka | (11h 03m 29.25s , +11d 14m 56.3s) | C | 60 | 19.4 | 9759 | 2026-02-19 16:47:02 | MASTER-Tunka | (11h 03m 09.30s , +11d 21m 54.5s) | C | 60 | 19.3 | 10877 | 2026-02-19 17:05:40 | MASTER-Tunka | (11h 18m 34.85s , +11d 21m 16.4s) | C | 60 | 19.7 | 10877 | 2026-02-19 17:05:40 | MASTER-Tunka | (11h 18m 55.04s , +11d 14m 26.8s) | C | 60 | 19.8 | 12397 | 2026-02-19 17:31:00 | MASTER-Tunka | (11h 15m 03.51s , +09d 19m 24.2s) | C | 60 | 17.4 | 12397 | 2026-02-19 17:31:00 | MASTER-Tunka | (11h 14m 42.55s , +09d 26m 02.0s) | C | 60 | 17.4 | 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/43786. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41895] GRB 260219A: Fermi GBM Final Real-time Localization
by GCN Circulars 19 Feb '26

19 Feb '26

TITLE: GCN CIRCULAR NUMBER: 43785 SUBJECT: GRB 260219A: Fermi GBM Final Real-time Localization DATE: 26/02/19 14:18:05 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 14:04:53 UT on 19 Feb 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260219A (trigger 793202698.807012 / 260219587). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 167.4, Dec = 9.6 (J2000 degrees, equivalent to J2000 11h 09m, 9d 35'), with a statistical uncertainty of 2.7 degrees. The angle from the Fermi LAT boresight is 97.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260219587/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260219587/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260219587/… View this GCN Circular online at https://gcn.nasa.gov/circulars/43785. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41894] SVOM alert sb26021801: LAST optical upper limit
by GCN Circulars 19 Feb '26

19 Feb '26

TITLE: GCN CIRCULAR NUMBER: 43784 SUBJECT: SVOM alert sb26021801: LAST optical upper limit DATE: 26/02/19 13:17:44 GMT FROM: Ruslan Konno at Weizmann Institute of Science <ruslankonno(a)gmail.com> R. Konno (WIS), S. Garrappa (WIS), E. A. Zimmerman (WIS), A. Horowicz (WIS), E. O. Ofek (WIS), S. Ben-Ami (WIS), D. Polishook (WIS), O. Yaron (WIS), S. Fainer (WIS), A. Krassilchtchikov (WIS), Y. M. Shani (WIS), E. Segre (WIS), A. Gal-Yam (WIS), and S. Spitzer (WIS) report on behalf of the LAST Collaboration. We report observations of the X-ray transient alert sb26021801, reported by SVOM (Tan et al., GCN 43778). Observations were conducted with the Large Array Survey Telescope (LAST; Ofek et al. 2023, PASP 135, 5001; Ben-Ami et al. 2023, PASP 135, 5002). Observations of sb26021801 were taken over 11 sequential epochs in clear band (similar to the Gaia Bp band). The first epoch began at 2026-02-18 23:06:13 UTC (T-T0 = 0.76d). Each epoch consists of 20x20s exposures. We coadd a total of 160x20s exposure images and perform image subtraction using a reference image of the field. We do not detect any new optical source up to a limiting magnitude of 21.5 (AB) within the error region reported in Tan et al., GCN 43778. See also Fortin et al. GCN 43783 for further optical limits. LAST is a survey telescope array of the Weizmann Astrophysical Observatory (https://www.weizmann.ac.il/wao/) View this GCN Circular online at https://gcn.nasa.gov/circulars/43784. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41893] sb26021801: SVOM/COLIBRÍ (FM-GFT) optical upper limit
by GCN Circulars 19 Feb '26

19 Feb '26

TITLE: GCN CIRCULAR NUMBER: 43783 SUBJECT: sb26021801: SVOM/COLIBRÍ (FM-GFT) optical upper limit DATE: 26/02/19 10:40:16 GMT FROM: F. Fortin at IRAP <ffortin.sci.edu(a)gmail.com> Francis Fortin (IRAP), Noémie Globus (UNAM), Jean-Grégoire Ducoin (CPPM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Alan M. Watson (UNAM), Edilberto Aguilar-Ruiz (UNAM), Jean-Luc Atteia (IRAP), Camila Angulo (UNAM), Dalya Akl (NYUAD), Sarah Antier (IJCLAB), Rosa L. Becerra (UNAM), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Leonardo García García (UNAM), Ramandeep Gill (UNAM), Asuka Kuwata (UNAM), Nikos Mandarakas (LAM), 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), Antonio de Ugarte Postigo (LAM), Wenjin TAN (IHEP) and Chao WU (NAOC) report: We imaged the field of the SVOM trigger sb26021801 (Tan et al., GCN Circ. 43778) using the DDRAGO wide-field imager on the SVOM/COLIBRÍ (FM-GFT) telescope. We observed from 2026-02-19T08:46:59.976 to 2026-02-19T09:30:49.700 UTC (from 1.16 to 1.19 days after the trigger) and obtained 32 minutes of exposure in the r and z filters. The data were reduced, coadded and analysed with the COLIBRÍ 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 the stacked image, we do not detect any new source at the ECLAIRs source position (Tan et al., GCN Circ. 43778) down to the following 5-sigma limit: r > 22.50 z > 21.36 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/43783. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41892] IceCube Alert 260217A: Global MASTER-Net observations report
by GCN Circulars 19 Feb '26

19 Feb '26

TITLE: GCN CIRCULAR NUMBER: 43782 SUBJECT: IceCube Alert 260217A: Global MASTER-Net observations report DATE: 26/02/19 02:52:48 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) was pointed to the IceCube Alert 260217A (trigger No 80851825,05h 03m 33.60s , +14d 37m 48.0s, R=0.68) errorbox 16 sec after notice time and 1 days 73773 sec after trigger time at 2026-02-19 02:24:58 UT, with upper limit up to 20.1 mag. The observations began at zenith distance = 60 deg. The sun altitude is -35.3 deg. The galactic latitude b = -15 deg., longitude l = 187 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3144643 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 160204 | 2026-02-19 02:24:58 | MASTER-OAFA | (05h 03m 45.23s , +14d 51m 29.0s) | C | 60 | 19.8 | 160264 | 2026-02-19 02:24:58 | MASTER-OAFA | (05h 03m 45.23s , +14d 51m 29.0s) | C | 180 | 20.1 | Coadd 160264 | 2026-02-19 02:24:58 | MASTER- | (05h 04m 46.08s , +13d 52m 00.1s) | C | 180 | 18.5 | 160264 | 2026-02-19 02:24:58 | MASTER- | (05h 03m 26.64s , +14d 25m 36.7s) | C | 180 | 17.8 | 160269 | 2026-02-19 02:26:03 | MASTER-OAFA | (05h 03m 45.21s , +14d 51m 29.3s) | C | 60 | 19.8 | 160335 | 2026-02-19 02:27:09 | MASTER-OAFA | (05h 03m 45.18s , +14d 51m 29.4s) | C | 60 | 19.8 | 160453 | 2026-02-19 02:28:07 | MASTER- | (05h 04m 43.62s , +13d 53m 35.3s) | C | 180 | 18.6 | 160453 | 2026-02-19 02:28:07 | MASTER- | (05h 03m 24.11s , +14d 27m 11.9s) | C | 180 | 17.9 | 160461 | 2026-02-19 02:28:15 | MASTER-OAFA | (05h 03m 45.15s , +14d 51m 29.9s) | C | 180 | 20.1 | Coadd 160641 | 2026-02-19 02:31:15 | MASTER- | (05h 04m 43.75s , +13d 51m 54.5s) | C | 180 | 18.5 | 160641 | 2026-02-19 02:31:15 | MASTER- | (05h 03m 24.24s , +14d 25m 30.5s) | C | 180 | 18.1 | 160830 | 2026-02-19 02:34:24 | MASTER- | (05h 04m 46.70s , +13d 53m 29.4s) | C | 180 | 18.4 | 160830 | 2026-02-19 02:34:24 | MASTER- | (05h 03m 27.15s , +14d 27m 05.6s) | C | 180 | 17.9 | 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/43782. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41891] Fermi-LAT Gamma-ray Observations of IceCube-260217A
by GCN Circulars 18 Feb '26

18 Feb '26

TITLE: GCN CIRCULAR NUMBER: 43781 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-260217A DATE: 26/02/18 21:17:41 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 IC260217A neutrino event (GCN 43768) 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 26-02-17 at 05:55:24.52 UTC (T0) with J2000 position RA = 75.89 (+0.52, -0.56) deg, Decl. = 14.63 (+0.45, -0.43 ) deg 90% PSF containment (J2000). No cataloged gamma-ray sources are found within the 90% IC260217A 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 IC260217A 90% confidence localization. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC260217A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 2.0e-10 ph cm^-2 s^-1 for ~17-years (2008-08-04 / T0), <5.5e-09 (<1.7e-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/43781. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 41890] GRB 260217A: Fermi GBM Final Localization
by GCN Circulars 18 Feb '26

18 Feb '26

TITLE: GCN CIRCULAR NUMBER: 43780 SUBJECT: GRB 260217A: Fermi GBM Final Localization DATE: 26/02/18 11:43:01 GMT FROM: Cuán de Barra at UCD <cuan.debarra(a)ucdconnect.ie> The Fermi GBM team reports the detection of a likely LONG GRB At 09:18:12.01 UT on 17 February 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260217A (trigger 793012697/260217388). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 278.43, Dec = -5.30 (J2000 degrees, equivalent to J2000 18h 34m, -5d 18'), with a statistical uncertainty of 11.59 degrees. The angle from the Fermi LAT boresight is 91 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260217388/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260217388/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260217388/… View this GCN Circular online at https://gcn.nasa.gov/circulars/43780. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0