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[vsnet-grb-info 38775] Swift GRB250615.93: Global MASTER-Net observations report
by GCN Circulars 15 Jun '25

15 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40735 SUBJECT: Swift GRB250615.93: Global MASTER-Net observations report DATE: 25/06/15 22:32:26 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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB250615.93 (trigger No 1324646,19h 21m 22.56s , +04d 40m 19.2s, R=0.05) errorbox 25 sec after notice time and 42 sec after trigger time at 2025-06-15 22:26:02 UT, with upper limit up to 17.1 mag. The observations began at zenith distance = 46 deg. The sun altitude is -80.9 deg. The galactic latitude b = -5 deg., longitude l = 41 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2903527 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 48 | MASTER-SAAO | C | 10 | 16.9 | 48 | MASTER-SAAO | C | 10 | 17.1 | 77 | MASTER-SAAO | C | 10 | 17.0 | 77 | MASTER-SAAO | C | 10 | 17.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/40735. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38774] Fermi trigger No 771718064: Global MASTER-Net observations report
by GCN Circulars 15 Jun '25

15 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40734 SUBJECT: Fermi trigger No 771718064: Global MASTER-Net observations report DATE: 25/06/15 22:15:32 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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB250615.92 (trigger No 771718064,08h 56m 28.80s , -44d 43m 48.0s, R=9.43) errorbox 119 sec after notice time and 154 sec after trigger time at 2025-06-15 22:10:13 UT, with upper limit up to 17.3 mag. The observations began at zenith distance = 83 deg. The sun altitude is -79.2 deg. The galactic latitude b = 1 deg., longitude l = 266 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2903453 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 170 | 2025-06-15 22:10:13 | MASTER-SAAO | (09h 14m 46.22s , -47d 11m 07.1s) | C | 30 | 17.0 | 170 | 2025-06-15 22:10:13 | MASTER-SAAO | (09h 12m 12.28s , -46d 55m 37.8s) | C | 30 | 15.0 | 224 | 2025-06-15 22:11:03 | MASTER-SAAO | (09h 14m 46.07s , -47d 11m 01.9s) | C | 40 | 17.3 | 224 | 2025-06-15 22:11:03 | MASTER-SAAO | (09h 12m 12.19s , -46d 55m 31.5s) | C | 40 | 15.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/40734. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38773] Fermi Gamma-ray Burst Monitor trigger 771704505/250615765 is not a GRB
by GCN Circulars 15 Jun '25

15 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40733 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 771704505/250615765 is not a GRB DATE: 25/06/15 19:29:24 GMT FROM: rhamburg(a)usra.edu R. Hamburg (USRA) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 771704505/250615765 at 18:21:40.49 UT on 15 June 2025, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to solar flare." View this GCN Circular online at https://gcn.nasa.gov/circulars/40733. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38772] GRID detection of GRB 250612C
by GCN Circulars 15 Jun '25

15 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40732 SUBJECT: GRID detection of GRB 250612C DATE: 25/06/15 16:40:18 GMT FROM: GRID Student Team at Tsinghua University <grid(a)tsinghua.edu.cn> Zirui Yang, Longhao Li and Chenyu Wang report on behalf of the GRID Collaboration: GRID-11B reports the detection of the GRB 250612C, which was also detected by Fermi/GBM (GCN Circular 40704) and SVOM/GRM (GCN Circular 40708). The event was triggered with GRID on 2024-06-12 at 14:53:16 UTC. The measured burst duration (T90) is approximately 2.6 ± 0.9 seconds. The GRID light curve of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB250612C/GRID_GRB…. GRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4. View this GCN Circular online at https://gcn.nasa.gov/circulars/40732. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38771] sb25061207: Mephisto optical upper limits
by GCN Circulars 15 Jun '25

15 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40731 SUBJECT: sb25061207: Mephisto optical upper limits DATE: 25/06/15 03:55:24 GMT FROM: Brajesh Kumar at SWIFAR, YNU <brajesh(a)ynu.edu.cn> Ziwei Li, Guowang Du, Haipeng Lei, Jianhui Lian, Haoyang He, Xingzhu Zou, Yu Pan, Xinlei Chen, Xufeng Zhu, Helong Guo, Tao Wang, Yuan Fang, Jinghua Zhang, Dezi Liu, Chenxu Liu, Shiyan Zhong, Edoardo Lagioia, Brajesh Kumar, Yuanpei Yang, Xiangkun Liu, Xiaowei Liu (all SWIFAR, YNU) report on behalf of the Mephisto Team: We conducted simultaneous multi-band photometric observations of sb25061207 detected by SVOM/ECLAIRs (Zhang et al., GCN 40697) with the Multi-channel Photometric Survey Telescope (Mephisto) of Yunnan University, located at the Lijiang Observatory. Simultaneous u, g and v, r band observations of the field were initiated at 15:52:39 UTC on 2025-06-12 (~5.42 hours after the trigger) and three exposures of 300 seconds were acquired. In the stack images, no credible source was detected at the position of SVOM/VT (Li et al., GCN 40707), Swift/XRT (Evans et al., GCN 40711) and EP-FXT (Song et al., GCN 40718). The preliminary 3-sigma upper limits are listed below which are consistent with SVOM/COLIBRÍ (FM-GFT) (Becerra et. al., GCN 40723). | UT Start |T-T0 (hr)|Band| EXP(s) |Lim-mag (AB) |2025-06-12T15:52:39| 5.42 | u | 300.0*3 | >21.24 |2025-06-12T16:10:13| 5.71 | v | 300.0*3 | >21.31 |2025-06-12T15:52:38| 5.42 | g | 300.0*3 | >21.60 |2025-06-12T16:10:12| 5.71 | r | 300.0*3 | >21.83 ---------------------------------------------------------- Mephisto (Multi-channel Photometric Survey Telescope) is a 1.6-m wide-field multi-channel telescope, the first of its type in the world, capable of imaging the same field of view in three optical bands simultaneously. It provides real-time, high-quality colors of stellar objects. The on-site telescope assemblage and commissioning were carried out in September 2022. The first light in all three channels was achieved on 2023 December 21. ---------------------------------------------------------- View this GCN Circular online at https://gcn.nasa.gov/circulars/40731. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38770] IceCube alert 141029_8144692 retraction
by GCN Circulars 14 Jun '25

14 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40730 SUBJECT: IceCube alert 141029_8144692 retraction DATE: 25/06/14 15:31:50 GMT FROM: Erik Blaufuss at University of Maryland, College Park <blaufuss(a)umd.edu> The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 14 June 2025 at 09:14:04 UT IceCube issued an alert (https://gcn.gsfc.nasa.gov/notices_amon_icecube_cascade/141029_8144692.amon) reporting the detection of a neutrino cascade candidate event with a high chance of being of astrophysical origin. Upon further examination by the IceCube collaboration, the event was found to be from a non-standard configuration that was intended to be excluded from alert selection At the time of this alert, the detector was operating normally but taking data in a non-standard test configuration. Normally, these periods of operation are excluded from generating alerts, but an alert message was significantly delayed in transit from the detector site at the South Pole and arrived after resuming normal operations We apologize for any confusion this error may have caused. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc(a)icecube.wisc.edu View this GCN Circular online at https://gcn.nasa.gov/circulars/40730. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38769] Fermi Gamma-ray Burst Monitor trigger 771596290/250614513 is not a GRB
by GCN Circulars 14 Jun '25

14 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40729 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 771596290/250614513 is not a GRB DATE: 25/06/14 13:13:42 GMT FROM: Cuán de Barra at UCD <cuan.debarra(a)ucdconnect.ie> C.de Barra (University College Dublin) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 771596290/250614513 at 12:18:05.02 UT on 14 June 2025, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to local particle activity." View this GCN Circular online at https://gcn.nasa.gov/circulars/40729. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38768] GRB 250614A: Fermi GBM Final Real-time Localization
by GCN Circulars 14 Jun '25

14 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40728 SUBJECT: GRB 250614A: Fermi GBM Final Real-time Localization DATE: 25/06/14 12:28:37 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 12:18:05 UT on 14 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250614A (trigger 771596290.023932 / 250614513). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 343.1, Dec = 54.6 (J2000 degrees, equivalent to J2000 22h 52m, 54d 36'), with a statistical uncertainty of 1.0 degrees. The angle from the Fermi LAT boresight is 1.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250614513/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250614513/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250614513/… View this GCN Circular online at https://gcn.nasa.gov/circulars/40728. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38767] EP250612a / GRB 250612B: NOT optical observations of the afterglow candidate
by GCN Circulars 14 Jun '25

14 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40727 SUBJECT: EP250612a / GRB 250612B: NOT optical observations of the afterglow candidate DATE: 25/06/14 08:29:34 GMT FROM: Antonio Martin-Carrillo at UCD,Space Science Group <antonio.martin-carrillo(a)ucd.ie> A. de Ugarte Postigo (LAM), A. Martin-Carrillo (UCD), G. Corcoran (UCD), D. B. Malesani (DAWN/NBI and Radboud), D. Xu (NAOC), L. Cotter (UCD), B. P. Gompertz (U. Birmingham), A. A. Djupvik (NOT), L. Fuglsang (NOT), report on behalf of a larger collaboration. We observed the field of EP250612a / GRB 250612B detected by EP (Hua et al., GCN 40700) and Fermi (Fermi GBM team, GCN 40702), using the ALFOSC camera mounted on the Nordic Optical Telescope (NOT). We obtained 12x100 s exposures in the SDSS r-band, starting at 23:19 UT on 2025-05-13 (1.952 days after the EP trigger). At J2000 coordinates RA:15:18:36.667, DEC: -26:46:03.624 (error 0.5”), consistent with those by Li et al. (GCN 40716), the optical counterpart is detected in our stacked image with a preliminary magnitude: r = 23.59 +/- 0.22 (AB). The photometric calibration was performed using nearby stars from the Pan-STARRS catalog and the magnitudes are not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/40727. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38766] Fermi Gamma-ray Burst Monitor trigger 771547945/250613953 is not a GRB
by GCN Circulars 14 Jun '25

14 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40726 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 771547945/250613953 is not a GRB DATE: 25/06/14 00:57:35 GMT FROM: sumanbala2210(a)gmail.com S. Bala (USRA) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 771547945/250613953 at 22:52:20.54 UT on 13 June 2025, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to local particles." View this GCN Circular online at https://gcn.nasa.gov/circulars/40726. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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