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[vsnet-grb-info 43671] GRB 260818B: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
by GCN Circulars 26 Aug '26

26 Aug '26

TITLE: GCN CIRCULAR NUMBER: 45450 SUBJECT: GRB 260818B: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate DATE: 26/08/26 16:27:03 GMT FROM: J.-G. Ducoin at CPPM <ducoin(a)cppm.in2p3.fr> Jean-Grégoire Ducoin (CPPM), Marion Guelfand (CPPM), Diego López-Cámara (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (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), Francis Fortin (IRAP), Leonardo García-García (UNAM), Ramandeep Gill (UNAM), Noémie Globus (UNAM), Asuka Kuwata (UNAM), Massimiliano Lincetto (CPPM), Nikos Mandarakas (LAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), Margarita Pereyra (UNAM), Fredd Sánchez Álvarez (UNAM), Benjamin Schneider (LAM), Antonio de Ugarte Postigo (LAM), Alan M. Watson (UNAM) and Clare Plasse (HKU) report: We continued imaging the field of the SVOM GRB 260818B (Cordier et al., GCN Circ. 45398) using the DDRAGO two-channel wide-field imager on the SVOM/COLIBRÍ (FM-GFT) telescope. We observed from 2026-08-25T07:59:01 to 11:12:53.575 UTC (from 155.80 to 158.95 hours after the trigger) and obtained 144 minutes of simultaneous exposure in the r and z filters. The data were reduced and coadded with the COLIBRÍ ASU pipeline and analysed with STDWeb/STDPipe (Karpov 2025). The photometry was calibrated using nearby stars from the PanSTARRS DR1 catalog, is in the AB system, and is not corrected for Galactic extinction. We detect a possible optical transient (revealed by image subtraction using Legacy Survey as template) consistent with the ECLAIRs 4.6 arcmin error circle (Cordier et al., GCN Circ. 45398) at: RA(J2000) = 02:59:54.374 = 44.97656 degrees Dec(J2000) = 07:25:28.24 = 7.424511 degrees with an uncertainty of 0.5 arcsec. The preliminary photometry of the transient candidate, measured on the unsubtracted images, is: First epoch, 2026-08-19, 13.20 hr after the trigger: r = 24.24 +/- 0.15 mag z > 23.81 mag (3-sigma upper limit) Second epoch, 2026-08-25, 157.38 h after the trigger: r = 24.60 +/- 0.29 mag z = 22.84 +/- 0.15 mag At the first epoch, the transient candidate is brighter than the reference Legacy Survey source in the r band. At the second epoch, it is also brighter in the z band, showing a clear brightening relative to the first epoch. The source is located 11.1 arcseconds from the X-ray source EPF_J025955.0+072535 reported by Wu et al. (GCN Circ. 45407), and 1.9 arcseconds from the radio source S10 reported by Schroeder et al. (GCN Circ. 45418). We also retrieved an r-band template image from the Hyper Suprime-Cam Legacy Archive. A source is visible at the position of the optical transient candidate and may correspond to its host galaxy. At this stage, we cannot draw firm conclusions regarding the nature of the transient or a possible association with GRB 260818B. Further observations are ongoing. We encourage additional follow-up, particularly at redder wavelengths, to better constrain the nature of this source and assess its possible association with GRB 260818B. We thank the staff of the Observatorio Astronómico Nacional at Sierra de San Pedro Mártir, as well as the technical and engineering teams at CEA, CPPM, IRAP, LAM, OHP, OSU Pytheas, and UNAM. 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/45450. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43670] GRB 260808B: SAO RAS observations of the optical rebrightening
by GCN Circulars 26 Aug '26

26 Aug '26

TITLE: GCN CIRCULAR NUMBER: 45449 SUBJECT: GRB 260808B: SAO RAS observations of the optical rebrightening DATE: 26/08/26 16:26:53 GMT FROM: Alexander Moskvitin at SAO RAS <mosk(a)sao.ru> A. Moskvitin (SAO RAS), O. Spiridonova (SAO RAS), A. Pozanenko (IKI), A. Volnova (IKI), N. Pankov (IKI) report on behalf of GRB follow-up team We observed the field of the GRB 260808B discovered by the SVOM (Bouchet et al., GCN 45316; Brunet et al., GCN 45333), and also detected by EP-FXT (Wang et al., GCN 45322) with the Zeiss-1000, SAO RAS telescope + CCD photometer. A set of 7 x 300 sec images in Rc band were obtained on August 12, 22:44:17 -- August 13, 00:05:06 UT. The OT (Turpin et al., GCNs 45317; 45318; Li et al. GCN 45320; Adami et al., GCN 45323; Saccardi et al., GCN 45328; Schneider et al., GCN 45329; Bochenek and Perley, GCN 45330; Basa et al., GCN 45341; Burkhonov et al., GCN 45352; Li et al. GCN 45359; Moskvitin et al., GCN 45360; Guelfand et al., GCN 45364; de Ugarte Postigo et al. GCN 45379; Bochenek and Perley, GCN 45380) is clearly detected in our stacked image. Details of the observation are the following. Date, UTstart, t-T0, Exp., Filter, Mag, Err., UL (mid,d) (n*s) (3-sigma) 2026-08-12 22:44:17 4.37759 7*300 Rc 21.52 +/- 0.06 23.6 In comparison with our first epoch of observations (~0.42 days, see Moskvitin et al., GCN 45360) OT became 0.9 mag brighter. We can confirm rebrightening reported by Li et al. GCN 45359 and Guelfand et al., GCN 45364. The preliminary photometry (Vega) is based on nearby SDSS stars (Lupton 2005 transformation) and not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/45449. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43669] EP260822a: Global MASTER-Net observations report
by GCN Circulars 26 Aug '26

26 Aug '26

TITLE: GCN CIRCULAR NUMBER: 45448 SUBJECT: EP260822a: Global MASTER-Net observations report DATE: 26/08/26 16:05:11 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> D.Buckley (SAAO), M. Segura, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA) O.Gress, N.Budnev(ISU) 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 (Lomonosov MSU) A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) A.Sosnovskij (CrAO RAS) A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory) L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) R.Rebolo (The Instituto de Astrofisica de Canarias) MASTER-SAAO robotic telescope [1] located in South Africa (South African Astronomical Observatory) was pointed to the EP260822a ( EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> et al., GCN 45428) errorbox 1748 sec after notice time and 1 days 28395 sec after trigger time at 2026-08-23 23:09:17 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 54 deg. The sun altitude is -67.7 deg. MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP260822a errorbox 15766 sec after notice time and 1 days 42413 sec after trigger time at 2026-08-24 03:02:55 UT, with upper limit up to 16.5 mag. The observations began at zenith distance = 76 deg. The sun altitude is -59.9 deg. MASTER-Tunka robotic telescope located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the EP260822a errorbox 55384 sec after notice time and 1 days 82031 sec after trigger time at 2026-08-24 14:03:13 UT, with upper limit up to 18.9 mag. Observations started at twilight. The observations began at zenith distance = 80 deg. The sun altitude is -15.5 deg. The galactic latitude b = -51 deg., longitude l = 126 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3488802 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 114825 | 2026-08-23 23:09:17 | MASTER-SAAO | (00h 55m 15.84s , +10d 52m 14.5s) | C | 60 | 19.0 | 126463 | 2026-08-24 02:23:15 | MASTER-SAAO | (00h 54m 54.50s , +10d 57m 32.8s) | C | 60 | 19.2 | 128844 | 2026-08-24 03:02:55 | MASTER-OAFA | (00h 56m 29.45s , +11d 07m 24.6s) | C | 60 | 16.5 | 168461 | 2026-08-24 14:03:13 | MASTER-Tunka | (00h 55m 09.14s , +10d 51m 17.3s) | C | 60 | 18.4 | 168539 | 2026-08-24 14:04:30 | MASTER-Tunka | (00h 55m 16.07s , +10d 50m 17.1s) | C | 60 | 18.4 | 168617 | 2026-08-24 14:05:48 | MASTER-Tunka | (00h 55m 10.04s , +10d 49m 14.1s) | C | 60 | 18.6 | 168694 | 2026-08-24 14:07:06 | MASTER-Tunka | (00h 55m 14.92s , +10d 49m 15.7s) | C | 60 | 18.5 | 168772 | 2026-08-24 14:08:23 | MASTER-Tunka | (00h 55m 12.23s , +10d 50m 60.0s) | C | 60 | 18.5 | 168849 | 2026-08-24 14:09:40 | MASTER-Tunka | (00h 55m 12.23s , +10d 49m 13.1s) | C | 60 | 18.7 | 168926 | 2026-08-24 14:10:58 | MASTER-Tunka | (00h 55m 14.76s , +10d 51m 03.7s) | C | 60 | 18.7 | 169004 | 2026-08-24 14:12:15 | MASTER-Tunka | (00h 55m 09.13s , +10d 50m 02.4s) | C | 60 | 18.7 | 169083 | 2026-08-24 14:13:35 | MASTER-Tunka | (00h 55m 09.51s , +10d 51m 00.1s) | C | 60 | 18.8 | 169161 | 2026-08-24 14:14:53 | MASTER-Tunka | (00h 55m 15.19s , +10d 49m 58.1s) | C | 60 | 18.8 | 169238 | 2026-08-24 14:16:10 | MASTER-Tunka | (00h 55m 10.13s , +10d 48m 55.8s) | C | 60 | 18.8 | 169315 | 2026-08-24 14:17:26 | MASTER-Tunka | (00h 55m 15.87s , +10d 49m 04.0s) | C | 60 | 18.9 | 169392 | 2026-08-24 14:18:43 | MASTER-Tunka | (00h 55m 12.23s , +10d 50m 34.5s) | C | 60 | 18.8 | 169469 | 2026-08-24 14:20:01 | MASTER-Tunka | (00h 55m 12.26s , +10d 48m 50.4s) | C | 60 | 18.9 | 169548 | 2026-08-24 14:21:20 | MASTER-Tunka | (00h 55m 15.11s , +10d 50m 40.8s) | C | 60 | 18.9 | 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/45448. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43668] EP Alert 260820.31: Global MASTER-Net observations report
by GCN Circulars 26 Aug '26

26 Aug '26

TITLE: GCN CIRCULAR NUMBER: 45447 SUBJECT: EP Alert 260820.31: Global MASTER-Net observations report DATE: 26/08/26 16:05:04 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> D.Buckley (SAAO), 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 (Lomonosov MSU) A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) A.Sosnovskij (CrAO RAS) A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory) L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) R.Rebolo (The Instituto de Astrofisica de Canarias) O.Gress, N.Budnev(ISU) M. Segura, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA) MASTER-SAAO robotic telescope [1] located in South Africa (South African Astronomical Observatory) was pointed to the EP Alert 260820.31 (trigger No 1709285030,17h 38m 19.20s , -26d 59m 49.2s, R=0.0502714) errorbox 37247 sec after trigger time at 2026-08-20 17:48:21 UT, with upper limit up to 18.2 mag. The observations began at zenith distance = 8 deg. The sun altitude is -21.2 deg. The galactic latitude b = 2 deg., longitude l = 1 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3492243 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 37278 | 2026-08-20 17:48:21 | MASTER-SAAO | (17h 35m 55.49s , -27d 12m 58.5s) | C | 60 | 16.5 | 37372 | 2026-08-20 17:49:54 | MASTER-SAAO | (17h 36m 00.40s , -27d 12m 40.8s) | C | 60 | 16.5 | 37465 | 2026-08-20 17:51:28 | MASTER-SAAO | (17h 35m 57.43s , -27d 11m 21.3s) | C | 60 | 16.4 | 37559 | 2026-08-20 17:53:02 | MASTER-SAAO | (17h 35m 57.32s , -27d 12m 44.7s) | C | 60 | 17.4 | 37653 | 2026-08-20 17:54:35 | MASTER-SAAO | (17h 35m 59.43s , -27d 11m 12.0s) | C | 60 | 18.2 | 37748 | 2026-08-20 17:56:10 | MASTER-SAAO | (17h 35m 54.30s , -27d 11m 50.0s) | C | 60 | 18.0 | 37842 | 2026-08-20 17:57:44 | MASTER-SAAO | (17h 35m 53.56s , -27d 10m 48.2s) | C | 60 | 15.5 | 37936 | 2026-08-20 17:59:18 | MASTER-SAAO | (17h 35m 59.98s , -27d 11m 46.6s) | C | 60 | 17.4 | 38030 | 2026-08-20 18:00:53 | MASTER-SAAO | (17h 35m 54.51s , -27d 12m 44.4s) | C | 60 | 18.2 | 38124 | 2026-08-20 18:02:27 | MASTER-SAAO | (17h 35m 58.81s , -27d 12m 18.5s) | C | 60 | 17.3 | 38219 | 2026-08-20 18:04:02 | MASTER-SAAO | (17h 35m 57.00s , -27d 10m 57.2s) | C | 60 | 18.2 | 38313 | 2026-08-20 18:05:35 | MASTER-SAAO | (17h 35m 56.93s , -27d 12m 14.4s) | C | 60 | 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/45447. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43667] IceCube-260825A: No transient candidates from the Zwicky Transient Facility
by GCN Circulars 26 Aug '26

26 Aug '26

TITLE: GCN CIRCULAR NUMBER: 45446 SUBJECT: IceCube-260825A: No transient candidates from the Zwicky Transient Facility DATE: 26/08/26 15:21:41 GMT FROM: akshay.eranhalodi(a)desy.de Robert Stein (JSI), Cristobal Zilleruelo Cañas (DESY), Jannis Necker (Leiden University), Akshay Eranhalodi (DESY) and Anna Franckowiak (Ruhr University Bochum) report, On behalf of the Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations: As part of the ZTF neutrino follow up program (Stein et al. 2023), we observed the localization region of the neutrino event IceCube-260825A (Zilleruelo et. al, GCN 45438) with the Palomar 48-inch telescope, equipped with the 47 square degree ZTF camera (Bellm et al. 2019, Graham et al. 2019). We started observations in the g- and r-band beginning at 2026-08-25 11:01 UTC, approximately 0.1 hours after event time. We covered 81.2% (0.9 sq deg) of the reported localization region. This estimate accounts for chip gaps. Each exposure was 300s with a typical depth of 21.0 mag. The images were processed in real-time through the ZTF reduction and image subtraction pipelines at IPAC to search for potential counterparts (Masci et al. 2019). AMPEL (Nordin et al. 2019, Stein et al. 2021) was used to search the alerts database for candidates. We reject stellar sources (Tachibana and Miller 2018) and moving objects, and apply machine learning algorithms (Mahabal et al. 2019) . No candidate counterparts were detected. ZTF and GROWTH are worldwide collaborations comprising Caltech/IPAC, USA; University of Maryland, USA; University of California, Berkeley, USA; Cornell University, USA; Drexel University, USA; University of North Carolina at Chapel Hill, USA; Institute of Science and Technology, Austria; National Central University, Taiwan; OKC, Sweden; DZA, Germany. GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019). Alert filtering is performed with the nuztf (Stein et al. 2021, https://github.com/desy-multimessenger/nuztf ). View this GCN Circular online at https://gcn.nasa.gov/circulars/45446. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43666] GRB 260807A: EP-FXT follow-up observations
by GCN Circulars 26 Aug '26

26 Aug '26

TITLE: GCN CIRCULAR NUMBER: 45445 SUBJECT: GRB 260807A: EP-FXT follow-up observations DATE: 26/08/26 11:11:27 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> Ruizhi Li (YNAO), Chao Wu, Huali Li, Wenjin Xie, Donghua Zhao (NAOC), Hui Yang, Laurent Bouchet (IRAP) report: We performed two EP/FXT observations of the possible faint GRB 260807A detected by SVOM/ECLAIRs (Xie et al., GCN 45308). The first EP/FXT observation started at 2026-08-07 12:51:33 UTC, approximately 1.85 hours post-trigger, with an exposure time of 5.8 ks. The second EP/FXT observation started at 2026-08-13 07:44:00 UTC, approximately 5.86 days post-trigger, with an exposure time of 4.3 ks. We analyzed the data from the two EP/FXT observations. None of the X-ray sources within the SVOM/ECLAIRs error circle (Xie et al., GCN 45308) showed significant fading between the two EP/FXT observations, with 90% confidence upper limits on the flux of 2.85 x 10^-14 erg cm^-2 s^-1 and 3.67 x 10^-14 erg cm^-2 s^-1, respectively. We conclude that no credible X-ray source within the SVOM/ECLAIRs error circle can be identified as the X-ray afterglow of the burst. View this GCN Circular online at https://gcn.nasa.gov/circulars/45445. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43665] GRB 260822A: SVOM/ECLAIRs refined analysis
by GCN Circulars 26 Aug '26

26 Aug '26

TITLE: GCN CIRCULAR NUMBER: 45444 SUBJECT: GRB 260822A: SVOM/ECLAIRs refined analysis DATE: 26/08/26 08:53:15 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> H. Yang, O. Godet, S. Guillot (IRAP), S. Schanne, D. Turpin, D. Götz (CEA/Irfu) report on behalf of the SVOM/ECLAIRs team: Using the event-by-event data downloaded through the X-band ground station, we report further analysis of SVOM/ECLAIRs observations of the short burst GRB 260822A (SVOM burst-id sb26082201, GCN 45422, trigger time T0 = 2026-08-22T16:50:36.0 UTC). The ECLAIRs lightcurve shows a multi-peaked structure, with T90(4-120 keV) = 0.18 +/- 0.05 s. No obvious extended emission has been detected. The time-averaged spectrum from T0+ 0.637 s to T0 + 0.817 s in the 5-120 keV range, is well fitted by a power-law model with a photon index of -1.0 +/-0.1, a 4-120 keV photon flux of (6.9 +0.3/-1.4) photons/cm^2/s, and a corresponding 4-120 keV fluence of (6.5 +/-0.9)e-8 erg/cm^2. All the quoted errors are at the 68% confidence level. The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. The SVOM/ECLAIRs point of contact for this burst is: Hui Yang (IRAP) (hui.yang(a)cnrs.fr) View this GCN Circular online at https://gcn.nasa.gov/circulars/45444. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43664] GRB 260809A: SVOM/ECLAIRs refined analysis
by GCN Circulars 26 Aug '26

26 Aug '26

TITLE: GCN CIRCULAR NUMBER: 45443 SUBJECT: GRB 260809A: SVOM/ECLAIRs refined analysis DATE: 26/08/26 08:39:21 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> M. Brunet, H. Yang, O. Godet (IRAP), F. Piron (LUMP) report on behalf of the SVOM/ECLAIRs team: Using the event-by-event data downloaded through the X-band ground station, we report further analysis of SVOM/ECLAIRs observations of the faint burst GRB 260809A (SVOM burst-id sb26080907, GCN 45331, trigger time T0 = 2026-08-09T14:57:33 UTC), also detected as a sub-threshold event by Fermi/GBM (GCN 45366). The burst that triggered ECLAIRs shows a multiple peak light curve, and is detected from T0-24 s to T0+19 s in the 4-120 keV energy band. The time-averaged spectrum from T0-24 s to T0+19 in the 5-120 keV is well fitted by a power-law model with a photon index of -1.3+/-0.2, a 4-120 keV photon flux of 0.76 +0.06/-0.20 photons/cm^2/s, and a corresponding 4-120 keV fluence of (1.4 +/-0.3)e-6 erg/cm^2. All the quoted errors are at the 68% confidence level. The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. The SVOM/ECLAIRs point of contact for this burst is: Marius Brunet (IRAP) (marius.brunet(a)utoulouse.fr) View this GCN Circular online at https://gcn.nasa.gov/circulars/45443. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43663] GRB 260822A: SVOM/VT optical upper limits
by GCN Circulars 25 Aug '26

25 Aug '26

TITLE: GCN CIRCULAR NUMBER: 45442 SUBJECT: GRB 260822A: SVOM/VT optical upper limits DATE: 26/08/25 18:13:04 GMT FROM: Huali Li at at NAOC, SVOM <lhl(a)nao.cas.cn> H. L. Li, L. P. Xin, C. Wu, Y. N. Ma, Y. L. Qiu, Z. H. Yao, J. R. Xu, X. H. Han, J. Wang, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, J. S. Deng, J. Y. Wei (NAOC) and J. T. Palmerio (CEA/Irfu) report on behalf of the SVOM/VT team. SVOM/VT performed two additional ToO observations of GRB 260822A (sb26082201, Schanne et al., GCN 45422) at mid-times of 18.9 h and 23.8 h in the VT_B (400-650 nm) and VT_R (650-1000 nm) channels simultaneously. No credible candidate was found in the stacked images of each epoch from both the earlier VT observations (Li et al., GCN 45430) and the present ToO observations, within the SVOM/ECLAIRs error box (Schanne et al., GCN 45422) and the Einstein Probe positions (Turpin et al., GCN 45436). The typical 5-sigma upper limits are 23.0 mag in both channels. Our measurements are in AB magnitudes and are not corrected for Galactic extinction. This non-detection is consistent with the reports from GOTO (O'Neill et al., GCN 45423), GROWTH-India (Saikia et al., GCN 45424), LCO (Turpin et al., GCN 45427) and PRIME (Durbak et al., GCN 45437). 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/45442. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43662] IceCube Alert 260825A: Global MASTER-Net observations report
by GCN Circulars 25 Aug '26

25 Aug '26

TITLE: GCN CIRCULAR NUMBER: 45441 SUBJECT: IceCube Alert 260825A: Global MASTER-Net observations report DATE: 26/08/25 15:39:19 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), M. Segura, 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) was pointed to the IceCube Alert 260825A (trigger No 44905242,06h 07m 48.00s , +45d 43m 48.0s, R=0.52) errorbox 7565 sec after notice time and 7608 sec after trigger time at 2026-08-25 13:00:21 UT, with upper limit up to 17.1 mag. Observations started at twilight. The observations began at zenith distance = 82 deg. The sun altitude is -7.9 deg. The galactic latitude b = 13 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=3491246 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 7609 | 2026-08-25 13:00:21 | MASTER-Tunka | (06h 06m 04.15s , +46d 13m 20.5s) | P- | 1 | 12.1 | 7615 | 2026-08-25 13:00:27 | MASTER-Tunka | (06h 06m 04.13s , +46d 13m 20.5s) | P- | 1 | 12.1 | 7632 | 2026-08-25 13:00:44 | MASTER-Tunka | (06h 06m 04.10s , +46d 13m 21.5s) | P- | 1 | 12.2 | 7643 | 2026-08-25 13:00:55 | MASTER-Tunka | (06h 06m 04.04s , +46d 13m 21.6s) | P- | 1 | 12.1 | 7662 | 2026-08-25 13:01:14 | MASTER-Tunka | (06h 06m 04.04s , +46d 13m 21.8s) | P- | 1 | 12.0 | 7666 | 2026-08-25 13:01:18 | MASTER-Tunka | (06h 06m 04.02s , +46d 13m 21.6s) | P- | 1 | 12.0 | 7671 | 2026-08-25 13:01:24 | MASTER-Tunka | (06h 06m 04.05s , +46d 13m 22.3s) | P- | 1 | 12.1 | 7677 | 2026-08-25 13:01:29 | MASTER-Tunka | (06h 06m 04.00s , +46d 13m 22.4s) | P- | 1 | 12.1 | 7683 | 2026-08-25 13:01:35 | MASTER-Tunka | (06h 06m 04.01s , +46d 13m 22.0s) | P- | 1 | 12.1 | 7688 | 2026-08-25 13:01:40 | MASTER-Tunka | (06h 06m 03.99s , +46d 13m 22.8s) | P- | 1 | 12.1 | 7694 | 2026-08-25 13:01:46 | MASTER-Tunka | (06h 06m 04.01s , +46d 13m 22.7s) | P- | 1 | 12.1 | 7700 | 2026-08-25 13:01:52 | MASTER-Tunka | (06h 06m 04.04s , +46d 13m 22.9s) | P- | 1 | 12.3 | 7705 | 2026-08-25 13:01:57 | MASTER-Tunka | (06h 06m 04.01s , +46d 13m 22.8s) | P- | 1 | 12.2 | 7710 | 2026-08-25 13:02:02 | MASTER-Tunka | (06h 06m 03.98s , +46d 13m 23.6s) | P- | 1 | 12.3 | 7716 | 2026-08-25 13:02:08 | MASTER-Tunka | (06h 06m 03.98s , +46d 13m 23.6s) | P- | 1 | 12.4 | 7721 | 2026-08-25 13:02:13 | MASTER-Tunka | (06h 06m 03.95s , +46d 13m 24.2s) | P- | 1 | 12.4 | 7727 | 2026-08-25 13:02:19 | MASTER-Tunka | (06h 06m 03.96s , +46d 13m 23.3s) | P- | 1 | 12.2 | 7732 | 2026-08-25 13:02:24 | MASTER-Tunka | (06h 06m 03.95s , +46d 13m 23.7s) | P- | 1 | 12.4 | 7738 | 2026-08-25 13:02:30 | MASTER-Tunka | (06h 06m 03.92s , +46d 13m 23.7s) | P- | 1 | 12.4 | 7743 | 2026-08-25 13:02:35 | MASTER-Tunka | (06h 06m 03.89s , +46d 13m 24.1s) | P- | 1 | 12.4 | 7749 | 2026-08-25 13:02:41 | MASTER-Tunka | (06h 06m 03.87s , +46d 13m 24.3s) | P- | 1 | 12.4 | 7754 | 2026-08-25 13:02:46 | MASTER-Tunka | (06h 06m 03.88s , +46d 13m 24.3s) | P- | 1 | 12.4 | 7760 | 2026-08-25 13:02:52 | MASTER-Tunka | (06h 06m 03.87s , +46d 13m 24.9s) | P- | 1 | 12.6 | 7765 | 2026-08-25 13:02:57 | MASTER-Tunka | (06h 06m 03.89s , +46d 13m 24.4s) | P- | 1 | 12.4 | 7771 | 2026-08-25 13:03:03 | MASTER-Tunka | (06h 06m 03.84s , +46d 13m 24.8s) | P- | 1 | 12.4 | 7776 | 2026-08-25 13:03:08 | MASTER-Tunka | (06h 06m 03.81s , +46d 13m 24.7s) | P- | 1 | 12.5 | 7782 | 2026-08-25 13:03:14 | MASTER-Tunka | (06h 06m 03.79s , +46d 13m 25.9s) | P- | 1 | 12.6 | 7787 | 2026-08-25 13:03:19 | MASTER-Tunka | (06h 06m 03.80s , +46d 13m 24.6s) | P- | 1 | 12.4 | 7793 | 2026-08-25 13:03:25 | MASTER-Tunka | (06h 06m 03.80s , +46d 13m 25.3s) | P- | 1 | 12.5 | 7799 | 2026-08-25 13:03:31 | MASTER-Tunka | (06h 06m 03.73s , +46d 13m 26.0s) | P- | 1 | 12.6 | 7804 | 2026-08-25 13:03:36 | MASTER-Tunka | (06h 06m 03.77s , +46d 13m 25.1s) | P- | 1 | 12.4 | 7809 | 2026-08-25 13:03:42 | MASTER-Tunka | (06h 06m 03.73s , +46d 13m 26.1s) | P- | 1 | 12.6 | 7815 | 2026-08-25 13:03:47 | MASTER-Tunka | (06h 06m 03.76s , +46d 13m 26.4s) | P- | 1 | 12.5 | 7821 | 2026-08-25 13:03:53 | MASTER-Tunka | (06h 06m 03.73s , +46d 13m 26.1s) | P- | 1 | 12.4 | 7826 | 2026-08-25 13:03:58 | MASTER-Tunka | (06h 06m 03.72s , +46d 13m 26.1s) | P- | 1 | 12.6 | 7831 | 2026-08-25 13:04:04 | MASTER-Tunka | (06h 06m 03.71s , +46d 13m 26.7s) | P- | 1 | 12.4 | 7837 | 2026-08-25 13:04:09 | MASTER-Tunka | (06h 06m 03.70s , +46d 13m 26.4s) | P- | 1 | 12.7 | 7843 | 2026-08-25 13:04:15 | MASTER-Tunka | (06h 06m 03.68s , +46d 13m 26.9s) | P- | 1 | 12.6 | 7848 | 2026-08-25 13:04:20 | MASTER-Tunka | (06h 06m 03.68s , +46d 13m 26.4s) | P- | 1 | 12.4 | 7853 | 2026-08-25 13:04:26 | MASTER-Tunka | (06h 06m 03.70s , +46d 13m 26.7s) | P- | 1 | 12.7 | 7859 | 2026-08-25 13:04:31 | MASTER-Tunka | (06h 06m 03.70s , +46d 13m 27.1s) | P- | 1 | 12.7 | 7865 | 2026-08-25 13:04:37 | MASTER-Tunka | (06h 06m 03.69s , +46d 13m 27.4s) | P- | 1 | 13.0 | 7870 | 2026-08-25 13:04:42 | MASTER-Tunka | (06h 06m 03.63s , +46d 13m 28.1s) | P- | 1 | 13.0 | 7875 | 2026-08-25 13:04:48 | MASTER-Tunka | (06h 06m 03.63s , +46d 13m 27.7s) | P- | 1 | 12.9 | 7881 | 2026-08-25 13:04:53 | MASTER-Tunka | (06h 06m 03.62s , +46d 13m 27.5s) | P- | 1 | 12.6 | 7886 | 2026-08-25 13:04:58 | MASTER-Tunka | (06h 06m 03.62s , +46d 13m 28.1s) | P- | 1 | 12.9 | 7892 | 2026-08-25 13:05:04 | MASTER-Tunka | (06h 06m 03.58s , +46d 13m 28.1s) | P- | 1 | 12.8 | 7897 | 2026-08-25 13:05:10 | MASTER-Tunka | (06h 06m 03.60s , +46d 13m 28.1s) | P- | 1 | 13.1 | 7903 | 2026-08-25 13:05:15 | MASTER-Tunka | (06h 06m 03.60s , +46d 13m 28.3s) | P- | 1 | 12.9 | 7909 | 2026-08-25 13:05:21 | MASTER-Tunka | (06h 06m 03.55s , +46d 13m 28.5s) | P- | 1 | 12.9 | 7914 | 2026-08-25 13:05:26 | MASTER-Tunka | (06h 06m 03.55s , +46d 13m 29.0s) | P- | 1 | 12.5 | 7919 | 2026-08-25 13:05:32 | MASTER-Tunka | (06h 06m 03.53s , +46d 13m 29.5s) | P- | 1 | 12.8 | 7925 | 2026-08-25 13:05:37 | MASTER-Tunka | (06h 06m 03.56s , +46d 13m 29.3s) | P- | 1 | 12.9 | 7931 | 2026-08-25 13:05:43 | MASTER-Tunka | (06h 06m 03.51s , +46d 13m 29.7s) | P- | 1 | 12.9 | 7936 | 2026-08-25 13:05:49 | MASTER-Tunka | (06h 06m 03.51s , +46d 13m 29.5s) | P- | 1 | 12.6 | 7942 | 2026-08-25 13:05:54 | MASTER-Tunka | (06h 06m 03.48s , +46d 13m 30.1s) | P- | 1 | 12.9 | 7947 | 2026-08-25 13:05:59 | MASTER-Tunka | (06h 06m 03.54s , +46d 13m 29.6s) | P- | 1 | 12.6 | 7953 | 2026-08-25 13:06:05 | MASTER-Tunka | (06h 06m 03.46s , +46d 13m 29.6s) | P- | 1 | 12.7 | 7958 | 2026-08-25 13:06:10 | MASTER-Tunka | (06h 06m 03.48s , +46d 13m 29.2s) | P- | 1 | 12.6 | 7964 | 2026-08-25 13:06:16 | MASTER-Tunka | (06h 06m 03.44s , +46d 13m 30.3s) | P- | 1 | 12.9 | 7969 | 2026-08-25 13:06:21 | MASTER-Tunka | (06h 06m 03.45s , +46d 13m 30.5s) | P- | 1 | 12.9 | 7974 | 2026-08-25 13:06:27 | MASTER-Tunka | (06h 06m 03.40s , +46d 13m 31.4s) | P- | 1 | 12.9 | 7980 | 2026-08-25 13:06:32 | MASTER-Tunka | (06h 06m 03.47s , +46d 13m 30.8s) | P- | 1 | 12.9 | 7985 | 2026-08-25 13:06:37 | MASTER-Tunka | (06h 06m 03.44s , +46d 13m 31.3s) | P- | 1 | 12.6 | 7991 | 2026-08-25 13:06:43 | MASTER-Tunka | (06h 06m 03.37s , +46d 13m 31.1s) | P- | 1 | 12.6 | 7997 | 2026-08-25 13:06:49 | MASTER-Tunka | (06h 06m 03.38s , +46d 13m 31.1s) | P- | 1 | 12.9 | 8002 | 2026-08-25 13:06:55 | MASTER-Tunka | (06h 06m 03.39s , +46d 13m 31.9s) | P- | 1 | 12.9 | 8008 | 2026-08-25 13:07:00 | MASTER-Tunka | (06h 06m 03.35s , +46d 13m 32.2s) | P- | 1 | 12.9 | 8013 | 2026-08-25 13:07:05 | MASTER-Tunka | (06h 06m 03.34s , +46d 13m 32.4s) | P- | 1 | 12.9 | 8019 | 2026-08-25 13:07:11 | MASTER-Tunka | (06h 06m 03.31s , +46d 13m 32.6s) | P- | 1 | 12.9 | 8025 | 2026-08-25 13:07:17 | MASTER-Tunka | (06h 06m 03.28s , +46d 13m 33.1s) | P- | 1 | 12.9 | 8030 | 2026-08-25 13:07:22 | MASTER-Tunka | (06h 06m 03.31s , +46d 13m 33.7s) | P- | 1 | 12.9 | 8036 | 2026-08-25 13:07:28 | MASTER-Tunka | (06h 06m 03.31s , +46d 13m 33.7s) | P- | 1 | 12.9 | 8041 | 2026-08-25 13:07:33 | MASTER-Tunka | (06h 06m 03.28s , +46d 13m 34.0s) | P- | 1 | 12.9 | 8046 | 2026-08-25 13:07:39 | MASTER-Tunka | (06h 06m 03.27s , +46d 13m 33.6s) | P- | 1 | 12.9 | 8052 | 2026-08-25 13:07:44 | MASTER-Tunka | (06h 06m 03.28s , +46d 13m 33.3s) | P- | 1 | 12.6 | 8058 | 2026-08-25 13:07:50 | MASTER-Tunka | (06h 06m 03.25s , +46d 13m 33.7s) | P- | 1 | 12.9 | 8063 | 2026-08-25 13:07:55 | MASTER-Tunka | (06h 06m 03.27s , +46d 13m 34.0s) | P- | 1 | 12.9 | 8069 | 2026-08-25 13:08:01 | MASTER-Tunka | (06h 06m 03.24s , +46d 13m 34.7s) | P- | 1 | 12.9 | 8074 | 2026-08-25 13:08:06 | MASTER-Tunka | (06h 06m 03.22s , +46d 13m 34.5s) | P- | 1 | 12.9 | 8080 | 2026-08-25 13:08:12 | MASTER-Tunka | (06h 06m 03.22s , +46d 13m 35.0s) | P- | 1 | 12.9 | 8086 | 2026-08-25 13:08:18 | MASTER-Tunka | (06h 06m 03.21s , +46d 13m 35.5s) | P- | 1 | 12.7 | 8091 | 2026-08-25 13:08:23 | MASTER-Tunka | (06h 06m 03.17s , +46d 13m 35.6s) | P- | 1 | 12.7 | 8097 | 2026-08-25 13:08:29 | MASTER-Tunka | (06h 06m 03.15s , +46d 13m 35.7s) | P- | 1 | 12.9 | 8102 | 2026-08-25 13:08:34 | MASTER-Tunka | (06h 06m 03.17s , +46d 13m 35.6s) | P- | 1 | 12.7 | 8108 | 2026-08-25 13:08:40 | MASTER-Tunka | (06h 06m 03.17s , +46d 13m 36.0s) | P- | 1 | 12.9 | 8113 | 2026-08-25 13:08:45 | MASTER-Tunka | (06h 06m 03.15s , +46d 13m 36.0s) | P- | 1 | 12.9 | 8119 | 2026-08-25 13:08:51 | MASTER-Tunka | (06h 06m 03.13s , +46d 13m 36.9s) | P- | 1 | 12.7 | 8124 | 2026-08-25 13:08:57 | MASTER-Tunka | (06h 06m 03.13s , +46d 13m 36.7s) | P- | 1 | 12.6 | 8130 | 2026-08-25 13:09:02 | MASTER-Tunka | (06h 06m 03.11s , +46d 13m 37.1s) | P- | 1 | 12.9 | 8135 | 2026-08-25 13:09:07 | MASTER-Tunka | (06h 06m 03.11s , +46d 13m 37.2s) | P- | 1 | 12.6 | 8140 | 2026-08-25 13:09:12 | MASTER-Tunka | (06h 06m 03.09s , +46d 13m 37.7s) | P- | 1 | 12.9 | 8146 | 2026-08-25 13:09:18 | MASTER-Tunka | (06h 06m 03.11s , +46d 13m 37.5s) | P- | 1 | 12.6 | 8151 | 2026-08-25 13:09:24 | MASTER-Tunka | (06h 06m 03.11s , +46d 13m 36.6s) | P- | 1 | 12.9 | 8157 | 2026-08-25 13:09:29 | MASTER-Tunka | (06h 06m 03.07s , +46d 13m 37.3s) | P- | 1 | 12.9 | 8163 | 2026-08-25 13:09:35 | MASTER-Tunka | (06h 06m 03.05s , +46d 13m 37.5s) | P- | 1 | 12.9 | 8168 | 2026-08-25 13:09:40 | MASTER-Tunka | (06h 06m 03.01s , +46d 13m 37.5s) | P- | 1 | 12.9 | 8174 | 2026-08-25 13:09:46 | MASTER-Tunka | (06h 06m 03.03s , +46d 13m 37.8s) | P- | 1 | 12.9 | 8179 | 2026-08-25 13:09:51 | MASTER-Tunka | (06h 06m 03.04s , +46d 13m 38.2s) | P- | 1 | 13.0 | 8185 | 2026-08-25 13:09:57 | MASTER-Tunka | (06h 06m 03.02s , +46d 13m 38.4s) | P- | 1 | 12.9 | 8190 | 2026-08-25 13:10:02 | MASTER-Tunka | (06h 06m 03.04s , +46d 13m 38.8s) | P- | 1 | 12.9 | 8195 | 2026-08-25 13:10:08 | MASTER-Tunka | (06h 06m 03.01s , +46d 13m 38.6s) | P- | 1 | 12.9 | 8201 | 2026-08-25 13:10:13 | MASTER-Tunka | (06h 06m 02.99s , +46d 13m 38.7s) | P- | 1 | 13.1 | 8207 | 2026-08-25 13:10:19 | MASTER-Tunka | (06h 06m 03.00s , +46d 13m 38.7s) | P- | 1 | 13.3 | 8212 | 2026-08-25 13:10:25 | MASTER-Tunka | (06h 06m 02.95s , +46d 13m 39.5s) | P- | 1 | 13.3 | 8218 | 2026-08-25 13:10:30 | MASTER-Tunka | (06h 06m 02.97s , +46d 13m 39.2s) | P- | 1 | 13.2 | 8223 | 2026-08-25 13:10:35 | MASTER-Tunka | (06h 06m 02.95s , +46d 13m 39.6s) | P- | 1 | 13.2 | 8229 | 2026-08-25 13:10:41 | MASTER-Tunka | (06h 06m 02.96s , +46d 13m 39.0s) | P- | 1 | 13.2 | 8235 | 2026-08-25 13:10:47 | MASTER-Tunka | (06h 06m 02.92s , +46d 13m 39.1s) | P- | 1 | 13.3 | 8240 | 2026-08-25 13:10:52 | MASTER-Tunka | (06h 06m 02.88s , +46d 13m 39.5s) | P- | 1 | 13.3 | 8245 | 2026-08-25 13:10:57 | MASTER-Tunka | (06h 06m 02.85s , +46d 13m 40.0s) | P- | 1 | 13.3 | 8251 | 2026-08-25 13:11:03 | MASTER-Tunka | (06h 06m 02.83s , +46d 13m 39.7s) | P- | 1 | 13.3 | 8257 | 2026-08-25 13:11:09 | MASTER-Tunka | (06h 06m 02.85s , +46d 13m 40.1s) | P- | 1 | 13.3 | 8262 | 2026-08-25 13:11:14 | MASTER-Tunka | (06h 06m 02.82s , +46d 13m 40.7s) | P- | 1 | 13.3 | 8268 | 2026-08-25 13:11:20 | MASTER-Tunka | (06h 06m 02.82s , +46d 13m 40.7s) | P- | 1 | 13.3 | 8273 | 2026-08-25 13:11:25 | MASTER-Tunka | (06h 06m 02.80s , +46d 13m 40.8s) | P- | 1 | 13.3 | 8279 | 2026-08-25 13:11:31 | MASTER-Tunka | (06h 06m 02.79s , +46d 13m 41.1s) | P- | 1 | 13.4 | 8284 | 2026-08-25 13:11:36 | MASTER-Tunka | (06h 06m 02.80s , +46d 13m 40.7s) | P- | 1 | 13.3 | 8290 | 2026-08-25 13:11:42 | MASTER-Tunka | (06h 06m 02.78s , +46d 13m 40.9s) | P- | 1 | 13.5 | 8296 | 2026-08-25 13:11:48 | MASTER-Tunka | (06h 06m 02.80s , +46d 13m 41.4s) | P- | 1 | 13.3 | 8301 | 2026-08-25 13:11:53 | MASTER-Tunka | (06h 06m 02.79s , +46d 13m 41.2s) | P- | 1 | 13.4 | 8306 | 2026-08-25 13:11:59 | MASTER-Tunka | (06h 06m 02.77s , +46d 13m 41.3s) | P- | 1 | 13.4 | 8312 | 2026-08-25 13:12:04 | MASTER-Tunka | (06h 06m 02.76s , +46d 13m 41.2s) | P- | 1 | 13.3 | 8318 | 2026-08-25 13:12:10 | MASTER-Tunka | (06h 06m 02.75s , +46d 13m 42.0s) | P- | 1 | 13.6 | 8323 | 2026-08-25 13:12:15 | MASTER-Tunka | (06h 06m 02.73s , +46d 13m 42.6s) | P- | 1 | 13.3 | 8329 | 2026-08-25 13:12:21 | MASTER-Tunka | (06h 06m 02.74s , +46d 13m 43.1s) | P- | 1 | 13.6 | 8334 | 2026-08-25 13:12:26 | MASTER-Tunka | (06h 06m 02.73s , +46d 13m 43.1s) | P- | 1 | 13.4 | 8340 | 2026-08-25 13:12:32 | MASTER-Tunka | (06h 06m 02.70s , +46d 13m 43.6s) | P- | 1 | 13.4 | 8345 | 2026-08-25 13:12:38 | MASTER-Tunka | (06h 06m 02.68s , +46d 13m 43.4s) | P- | 1 | 13.4 | 8351 | 2026-08-25 13:12:43 | MASTER-Tunka | (06h 06m 02.69s , +46d 13m 43.6s) | P- | 1 | 13.4 | 8356 | 2026-08-25 13:12:48 | MASTER-Tunka | (06h 06m 02.65s , +46d 13m 43.8s) | P- | 1 | 13.4 | 8362 | 2026-08-25 13:12:54 | MASTER-Tunka | (06h 06m 02.69s , +46d 13m 43.9s) | P- | 1 | 13.3 | 8367 | 2026-08-25 13:12:59 | MASTER-Tunka | (06h 06m 02.65s , +46d 13m 44.2s) | P- | 1 | 13.3 | 8373 | 2026-08-25 13:13:05 | MASTER-Tunka | (06h 06m 02.62s , +46d 13m 43.9s) | P- | 1 | 13.3 | 8378 | 2026-08-25 13:13:10 | MASTER-Tunka | (06h 06m 02.59s , +46d 13m 44.3s) | P- | 1 | 13.3 | 8384 | 2026-08-25 13:13:16 | MASTER-Tunka | (06h 06m 02.60s , +46d 13m 44.1s) | P- | 1 | 13.3 | 8389 | 2026-08-25 13:13:21 | MASTER-Tunka | (06h 06m 02.61s , +46d 13m 44.0s) | P- | 1 | 13.4 | 8397 | 2026-08-25 13:13:27 | MASTER-Tunka | (06h 06m 02.61s , +46d 13m 44.4s) | P- | 5 | 14.1 | 8406 | 2026-08-25 13:13:36 | MASTER-Tunka | (06h 06m 02.59s , +46d 13m 44.5s) | P- | 5 | 14.0 | 8412 | 2026-08-25 13:13:44 | MASTER-Tunka | (06h 06m 02.56s , +46d 13m 44.7s) | P- | 1 | 13.3 | 8419 | 2026-08-25 13:13:49 | MASTER-Tunka | (06h 06m 02.56s , +46d 13m 44.9s) | P- | 5 | 14.2 | 8428 | 2026-08-25 13:13:58 | MASTER-Tunka | (06h 06m 02.54s , +46d 13m 44.5s) | P- | 5 | 14.2 | 8437 | 2026-08-25 13:14:07 | MASTER-Tunka | (06h 06m 02.53s , +46d 13m 44.7s) | P- | 5 | 14.3 | 8446 | 2026-08-25 13:14:16 | MASTER-Tunka | (06h 06m 02.49s , +46d 13m 45.0s) | P- | 5 | 14.1 | 8454 | 2026-08-25 13:14:24 | MASTER-Tunka | (06h 06m 02.47s , +46d 13m 44.6s) | P- | 5 | 14.1 | 8463 | 2026-08-25 13:14:33 | MASTER-Tunka | (06h 06m 02.45s , +46d 13m 44.8s) | P- | 5 | 14.2 | 8471 | 2026-08-25 13:14:41 | MASTER-Tunka | (06h 06m 02.44s , +46d 13m 45.2s) | P- | 5 | 14.1 | 8480 | 2026-08-25 13:14:50 | MASTER-Tunka | (06h 06m 02.42s , +46d 13m 45.0s) | P- | 5 | 14.2 | 8489 | 2026-08-25 13:14:59 | MASTER-Tunka | (06h 06m 02.42s , +46d 13m 44.7s) | P- | 5 | 14.1 | 8497 | 2026-08-25 13:15:08 | MASTER-Tunka | (06h 06m 02.40s , +46d 13m 45.8s) | P- | 5 | 14.3 | 8506 | 2026-08-25 13:15:17 | MASTER-Tunka | (06h 06m 02.37s , +46d 13m 47.2s) | P- | 5 | 14.3 | 8515 | 2026-08-25 13:15:25 | MASTER-Tunka | (06h 06m 02.35s , +46d 13m 47.3s) | P- | 5 | 14.4 | 8523 | 2026-08-25 13:15:33 | MASTER-Tunka | (06h 06m 02.36s , +46d 13m 47.4s) | P- | 5 | 14.4 | 8531 | 2026-08-25 13:15:42 | MASTER-Tunka | (06h 06m 02.33s , +46d 13m 47.6s) | P- | 5 | 14.2 | 8540 | 2026-08-25 13:15:50 | MASTER-Tunka | (06h 06m 02.33s , +46d 13m 47.8s) | P- | 5 | 14.3 | 8549 | 2026-08-25 13:15:59 | MASTER-Tunka | (06h 06m 02.31s , +46d 13m 47.6s) | P- | 5 | 14.3 | 8557 | 2026-08-25 13:16:07 | MASTER-Tunka | (06h 06m 02.27s , +46d 13m 48.5s) | P- | 5 | 14.4 | 8566 | 2026-08-25 13:16:16 | MASTER-Tunka | (06h 06m 02.24s , +46d 13m 49.1s) | P- | 5 | 14.5 | 8575 | 2026-08-25 13:16:25 | MASTER-Tunka | (06h 06m 02.21s , +46d 13m 49.0s) | P- | 5 | 14.5 | 12054 | 2026-08-25 14:14:12 | MASTER-Tunka | (06h 05m 54.35s , +46d 16m 08.1s) | C | 30 | 17.1 | 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/45441. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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