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[vsnet-grb-info 40310] Swift GRB 251014A: Global MASTER-Net observations report
by GCN Circulars 14 Oct '25

14 Oct '25

TITLE: GCN CIRCULAR NUMBER: 42239 SUBJECT: Swift GRB 251014A: Global MASTER-Net observations report DATE: 25/10/14 00:47:01 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 GRB 251014A ( E. Ambrosi et al., GCN 42238) errorbox 26 sec after notice time and 361 sec after trigger time at 2025-10-14 00:34:31 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 68 deg. The sun altitude is -39.4 deg. The galactic latitude b = 11 deg., longitude l = 212 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3014236 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 391 | MASTER-SAAO | C | 60 | 18.5 | 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/42239. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40309] GRB 251014A: Swift detection of a possibly-short burst
by GCN Circulars 14 Oct '25

14 Oct '25

TITLE: GCN CIRCULAR NUMBER: 42238 SUBJECT: GRB 251014A: Swift detection of a possibly-short burst DATE: 25/10/14 00:42:58 GMT FROM: David Palmer at LANL <palmer(a)lanl.gov> E. Ambrosi (INAF-IASFPA), V. D'Elia (SSDC & INAF-OAR), R. Gupta (NASA GSFC) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team: At 00:28:30 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 251014A (trigger=1403878). Swift did not slew immediately due to an observation constraint. The BAT on-board calculated location is RA, Dec 111.732, +6.415 which is RA(J2000) = 07h 26m 56s Dec(J2000) = +06d 24' 54" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single peak structure with a duration of about 1.5 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to a Moon observing constraint, Swift cannot slew to the BAT position until 21:52 UT on 2025 October 14. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is E. Ambrosi (elena.ambrosi AT inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/) View this GCN Circular online at https://gcn.nasa.gov/circulars/42238. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40308] GRB 251014A: Fermi GBM Final Real-time Localization
by GCN Circulars 14 Oct '25

14 Oct '25

TITLE: GCN CIRCULAR NUMBER: 42237 SUBJECT: GRB 251014A: Fermi GBM Final Real-time Localization DATE: 25/10/14 00:39:10 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely SHORT GRB At 00:28:30 UT on 14 Oct 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251014A (trigger 782094515.336852 / 251014020). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 114.7, Dec = 7.4 (J2000 degrees, equivalent to J2000 07h 38m, 7d 24'), with a statistical uncertainty of 8.3 degrees. The angle from the Fermi LAT boresight is 45.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251014020/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251014020/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251014020/… View this GCN Circular online at https://gcn.nasa.gov/circulars/42237. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40307] Fermi trigger No 782044789: Global MASTER-Net observations report
by GCN Circulars 14 Oct '25

14 Oct '25

TITLE: GCN CIRCULAR NUMBER: 42236 SUBJECT: Fermi trigger No 782044789: Global MASTER-Net observations report DATE: 25/10/14 00:15:33 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 (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB251013.44 (trigger No 782044789,16h 21m 00.00s , -23d 58m 58.8s, R=50) errorbox 46947 sec after notice time and 46980 sec after trigger time at 2025-10-13 23:42:44 UT, with upper limit up to 19.5 mag. Observations started at twilight. The observations began at zenith distance = 6 deg. The sun altitude is -13.0 deg. The galactic latitude b = 18 deg., longitude l = 353 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3013722 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 47010 | 2025-10-13 23:42:44 | MASTER-OAFA | (20h 11m 08.20s , -31d 38m 07.6s) | C | 60 | 19.5 | 47086 | 2025-10-13 23:44:00 | MASTER-OAFA | (20h 11m 08.28s , -31d 39m 50.4s) | C | 60 | 19.3 | 47162 | 2025-10-13 23:45:15 | MASTER-OAFA | (20h 11m 12.39s , -31d 38m 20.4s) | C | 60 | 19.5 | 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/42236. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40306] Fermi GRB 251013C: Global MASTER-Net observations report
by GCN Circulars 13 Oct '25

13 Oct '25

TITLE: GCN CIRCULAR NUMBER: 42235 SUBJECT: Fermi GRB 251013C: Global MASTER-Net observations report DATE: 25/10/13 23:46:00 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 GRB 251013C ( Fermi GBM team, GCN 42221) errorbox 10000 sec after notice time and 10034 sec after trigger time at 2025-10-13 20:26:56 UT, with upper limit up to 20.4 mag. The observations began at zenith distance = 32 deg. The sun altitude is -41.1 deg. The galactic latitude b = -59 deg., longitude l = 72 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3013941 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 10064 | 2025-10-13 20:26:56 | MASTER-SAAO | (23h 02m 39.24s , -00d 30m 39.4s) | C | 60 | 18.6 | 10158 | 2025-10-13 20:28:29 | MASTER-SAAO | (23h 02m 46.41s , -00d 31m 36.1s) | C | 60 | 18.7 | 10251 | 2025-10-13 20:30:02 | MASTER-SAAO | (23h 02m 40.37s , -00d 32m 32.6s) | C | 60 | 18.9 | 10345 | 2025-10-13 20:31:37 | MASTER-SAAO | (23h 02m 47.55s , -00d 32m 05.9s) | C | 60 | 18.8 | 10441 | 2025-10-13 20:33:12 | MASTER-SAAO | (23h 02m 45.46s , -00d 30m 49.0s) | C | 60 | 18.7 | 10539 | 2025-10-13 20:34:50 | MASTER-SAAO | (23h 02m 46.25s , -00d 32m 02.3s) | C | 60 | 18.6 | 10664 | 2025-10-13 20:36:25 | MASTER-SAAO | (23h 02m 49.67s , -00d 30m 22.6s) | C | 120 | 18.9 | 10817 | 2025-10-13 20:38:58 | MASTER-SAAO | (23h 02m 45.08s , -00d 31m 17.6s) | C | 120 | 18.8 | 10980 | 2025-10-13 20:41:42 | MASTER-SAAO | (23h 02m 47.31s , -00d 30m 13.8s) | C | 120 | 19.0 | 11135 | 2025-10-13 20:44:17 | MASTER-SAAO | (23h 02m 52.66s , -00d 31m 09.8s) | C | 120 | 19.0 | 11292 | 2025-10-13 20:46:54 | MASTER-SAAO | (23h 02m 47.94s , -00d 32m 05.5s) | C | 120 | 19.2 | 11446 | 2025-10-13 20:49:27 | MASTER-SAAO | (23h 02m 55.30s , -00d 32m 00.3s) | C | 120 | 19.2 | 11630 | 2025-10-13 20:52:01 | MASTER-SAAO | (23h 02m 53.52s , -00d 30m 03.7s) | C | 180 | 19.2 | 11847 | 2025-10-13 20:55:39 | MASTER-SAAO | (23h 02m 54.71s , -00d 31m 32.8s) | C | 180 | 19.2 | 12064 | 2025-10-13 20:59:15 | MASTER-SAAO | (23h 02m 58.96s , -00d 29m 55.7s) | C | 180 | 19.4 | 12247 | 2025-10-13 21:02:48 | MASTER-SAAO | (23h 02m 53.36s , -00d 30m 39.0s) | C | 120 | 19.4 | 12399 | 2025-10-13 21:05:21 | MASTER-SAAO | (23h 02m 55.07s , -00d 29m 35.0s) | C | 120 | 19.4 | 12519 | 2025-10-13 21:05:21 | MASTER-SAAO | (23h 02m 55.07s , -00d 29m 35.0s) | C | 360 | 20.1 | Coadd 12554 | 2025-10-13 21:07:55 | MASTER-SAAO | (23h 03m 01.04s , -00d 30m 30.6s) | C | 120 | 19.4 | 12722 | 2025-10-13 21:10:43 | MASTER-SAAO | (23h 02m 55.49s , -00d 31m 25.3s) | C | 120 | 19.7 | 12875 | 2025-10-13 21:13:16 | MASTER-SAAO | (23h 03m 01.00s , -00d 31m 12.9s) | C | 120 | 19.4 | 12995 | 2025-10-13 21:13:16 | MASTER-SAAO | (23h 03m 01.00s , -00d 31m 12.9s) | C | 360 | 20.4 | Coadd 13030 | 2025-10-13 21:15:51 | MASTER-SAAO | (23h 02m 59.29s , -00d 29m 35.6s) | C | 120 | 19.7 | 13194 | 2025-10-13 21:18:36 | MASTER-SAAO | (23h 02m 59.68s , -00d 30m 53.7s) | C | 120 | 19.6 | 13347 | 2025-10-13 21:21:09 | MASTER-SAAO | (23h 03m 02.87s , -00d 29m 15.8s) | C | 120 | 19.9 | 13502 | 2025-10-13 21:23:44 | MASTER-SAAO | (23h 02m 57.06s , -00d 30m 00.8s) | C | 120 | 19.8 | 16491 | 2025-10-13 22:14:02 | MASTER-SAAO | (23h 07m 20.08s , -06d 42m 29.2s) | C | 60 | 18.9 | 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/42235. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40305] Fermi GRB 251013C: Global MASTER-Net observations report
by GCN Circulars 13 Oct '25

13 Oct '25

TITLE: GCN CIRCULAR NUMBER: 42235 SUBJECT: Fermi GRB 251013C: Global MASTER-Net observations report DATE: 25/10/13 23:46:00 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 GRB 251013C ( Fermi GBM team, GCN 42221) errorbox 10000 sec after notice time and 10034 sec after trigger time at 2025-10-13 20:26:56 UT, with upper limit up to 20.4 mag. The observations began at zenith distance = 32 deg. The sun altitude is -41.1 deg. The galactic latitude b = -59 deg., longitude l = 72 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3013941 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 10064 | 2025-10-13 20:26:56 | MASTER-SAAO | (23h 02m 39.24s , -00d 30m 39.4s) | C | 60 | 18.6 | 10158 | 2025-10-13 20:28:29 | MASTER-SAAO | (23h 02m 46.41s , -00d 31m 36.1s) | C | 60 | 18.7 | 10251 | 2025-10-13 20:30:02 | MASTER-SAAO | (23h 02m 40.37s , -00d 32m 32.6s) | C | 60 | 18.9 | 10345 | 2025-10-13 20:31:37 | MASTER-SAAO | (23h 02m 47.55s , -00d 32m 05.9s) | C | 60 | 18.8 | 10441 | 2025-10-13 20:33:12 | MASTER-SAAO | (23h 02m 45.46s , -00d 30m 49.0s) | C | 60 | 18.7 | 10539 | 2025-10-13 20:34:50 | MASTER-SAAO | (23h 02m 46.25s , -00d 32m 02.3s) | C | 60 | 18.6 | 10664 | 2025-10-13 20:36:25 | MASTER-SAAO | (23h 02m 49.67s , -00d 30m 22.6s) | C | 120 | 18.9 | 10817 | 2025-10-13 20:38:58 | MASTER-SAAO | (23h 02m 45.08s , -00d 31m 17.6s) | C | 120 | 18.8 | 10980 | 2025-10-13 20:41:42 | MASTER-SAAO | (23h 02m 47.31s , -00d 30m 13.8s) | C | 120 | 19.0 | 11135 | 2025-10-13 20:44:17 | MASTER-SAAO | (23h 02m 52.66s , -00d 31m 09.8s) | C | 120 | 19.0 | 11292 | 2025-10-13 20:46:54 | MASTER-SAAO | (23h 02m 47.94s , -00d 32m 05.5s) | C | 120 | 19.2 | 11446 | 2025-10-13 20:49:27 | MASTER-SAAO | (23h 02m 55.30s , -00d 32m 00.3s) | C | 120 | 19.2 | 11630 | 2025-10-13 20:52:01 | MASTER-SAAO | (23h 02m 53.52s , -00d 30m 03.7s) | C | 180 | 19.2 | 11847 | 2025-10-13 20:55:39 | MASTER-SAAO | (23h 02m 54.71s , -00d 31m 32.8s) | C | 180 | 19.2 | 12064 | 2025-10-13 20:59:15 | MASTER-SAAO | (23h 02m 58.96s , -00d 29m 55.7s) | C | 180 | 19.4 | 12247 | 2025-10-13 21:02:48 | MASTER-SAAO | (23h 02m 53.36s , -00d 30m 39.0s) | C | 120 | 19.4 | 12399 | 2025-10-13 21:05:21 | MASTER-SAAO | (23h 02m 55.07s , -00d 29m 35.0s) | C | 120 | 19.4 | 12519 | 2025-10-13 21:05:21 | MASTER-SAAO | (23h 02m 55.07s , -00d 29m 35.0s) | C | 360 | 20.1 | Coadd 12554 | 2025-10-13 21:07:55 | MASTER-SAAO | (23h 03m 01.04s , -00d 30m 30.6s) | C | 120 | 19.4 | 12722 | 2025-10-13 21:10:43 | MASTER-SAAO | (23h 02m 55.49s , -00d 31m 25.3s) | C | 120 | 19.7 | 12875 | 2025-10-13 21:13:16 | MASTER-SAAO | (23h 03m 01.00s , -00d 31m 12.9s) | C | 120 | 19.4 | 12995 | 2025-10-13 21:13:16 | MASTER-SAAO | (23h 03m 01.00s , -00d 31m 12.9s) | C | 360 | 20.4 | Coadd 13030 | 2025-10-13 21:15:51 | MASTER-SAAO | (23h 02m 59.29s , -00d 29m 35.6s) | C | 120 | 19.7 | 13194 | 2025-10-13 21:18:36 | MASTER-SAAO | (23h 02m 59.68s , -00d 30m 53.7s) | C | 120 | 19.6 | 13347 | 2025-10-13 21:21:09 | MASTER-SAAO | (23h 03m 02.87s , -00d 29m 15.8s) | C | 120 | 19.9 | 13502 | 2025-10-13 21:23:44 | MASTER-SAAO | (23h 02m 57.06s , -00d 30m 00.8s) | C | 120 | 19.8 | 16491 | 2025-10-13 22:14:02 | MASTER-SAAO | (23h 07m 20.08s , -06d 42m 29.2s) | C | 60 | 18.9 | 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/42235. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40304] Fermi GRB 251013B: Global MASTER-Net observations report
by GCN Circulars 13 Oct '25

13 Oct '25

TITLE: GCN CIRCULAR NUMBER: 42234 SUBJECT: Fermi GRB 251013B: Global MASTER-Net observations report DATE: 25/10/13 23:31:09 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 GRB 251013B ( Fermi GBM team, GCN 42215) errorbox 48818 sec after notice time and 48841 sec after trigger time at 2025-10-13 21:58:28 UT, with upper limit up to 19.4 mag. The observations began at zenith distance = 41 deg. The sun altitude is -49.5 deg. The galactic latitude b = -52 deg., longitude l = 97 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3013666 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 48872 | 2025-10-13 21:58:28 | MASTER-SAAO | (23h 34m 30.91s , +04d 40m 04.5s) | C | 60 | 19.4 | 48872 | 2025-10-13 21:58:29 | MASTER-SAAO | (23h 32m 43.17s , +04d 55m 22.1s) | C | 60 | 19.2 | 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/42234. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40303] Fermi GRB 251013D: Global MASTER-Net observations report
by GCN Circulars 13 Oct '25

13 Oct '25

TITLE: GCN CIRCULAR NUMBER: 42233 SUBJECT: Fermi GRB 251013D: Global MASTER-Net observations report DATE: 25/10/13 22:31:33 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-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 GRB 251013D ( Fermi GBM team, GCN 42224) errorbox 12470 sec after notice time and 12506 sec after trigger time at 2025-10-13 21:45:26 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 54 deg. The sun altitude is -48.9 deg. The galactic latitude b = -41 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=3013985 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 12536 | 2025-10-13 21:45:26 | MASTER-SAAO | (02h 43m 45.87s , +12d 29m 46.5s) | C | 60 | 18.9 | 12536 | 2025-10-13 21:45:26 | MASTER-SAAO | (02h 45m 35.22s , +12d 14m 30.3s) | C | 60 | 19.0 | 12729 | 2025-10-13 21:48:39 | MASTER-SAAO | (02h 42m 32.93s , +10d 34m 14.1s) | C | 60 | 19.1 | 12729 | 2025-10-13 21:48:39 | MASTER-SAAO | (02h 44m 21.71s , +10d 18m 58.2s) | C | 60 | 19.2 | 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/42233. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40302] GRB 251013C: Swift-XRT counterpart detection
by GCN Circulars 13 Oct '25

13 Oct '25

TITLE: GCN CIRCULAR NUMBER: 42232 SUBJECT: GRB 251013C: Swift-XRT counterpart detection DATE: 25/10/13 22:23:39 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P.A. Evans (U. Leicester), J.A. Kennea (PSU), E. Ambrosi (INAF-IASFPA) , A.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB), R. Brivio (INAF-OAB), D.N. Burrows (PSU), S. Campana (INAF-OAB), M. Capalbi (INAF-OAR), A. D'Ai (INAF-IASFPA), P. D'Avanzo (INAF-OAB), V. D'Elia (SSDC & INAF-OAR), S. Dichiara (PSU), M. Ferro (INAF-OAB), A. Melandri (INAF-OAR), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M. Perri (SSDC & INAF-OAR), C. Salvaggio (INAF-OAB), T. Sbarrato (INAF-OAB), B. Sbarufatti (INAF-OAB), M.A. Williams (PSU) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the SVOM/ECLAIRs-detected source GRB 251013C (Rakotondrainibe et al., GCN 42222), collecting 1.8 ks of Photon Counting (PC) mode data between T0+344 s and T0+5.5 ks after the trigger. A bright, fading counterpart has been found, coincident with the VT optical, fading source reported by Palmerio et al. (GCN 42223), which has a redshift of 0.572 (Martin-Carrillo et al., GCN 42227). Thus, we can conclude that this is the XRT counterpart of GRB 251013C. The details of this source are: Source 1 (SWIFT J230320.5-001235): ================================== RA (J2000.0): 345.8358 = 23 03 20.59 Dec (J2000.0): -0.2100 = -00 12 36.0 Error: 3.5 (arcsec, radius, 90% confidence). Detect flag: GOOD Distance: 3.6 arcmin from the SVOM/ECLAIRs position. Mean rate: 2.356 +/- 0.081 ct s^-1 Mean flux: (8.71 +/- 0.30)e-11 erg cm^-2 s^-1 Peak rate: 10.2 +/- 1.9 ct s^-1 Peak flux: (3.76 +/- 0.69)e-10 erg cm^-2 s^-1 ECF: 3.70e-11 erg cm^-2 ct^-1 assuming NH=6.48e+20 cm^-2, gamma=1.78 determined from a spectral fit. XMM UL: 6.3e-13 erg cm^-2 s^-1, (0.3-10 keV) so the source is 5.4-sigma above this 3-sigma upper limit. All fluxes are 0.3-10 keV, observed. For all flux conversions and comparisons with catalogues and upper limits from other missions, we assumed a power-law spectrum with NH=3x10^20 cm^-2 and photon index (Gamma)=1.7 unless otherwise stated. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/SVOM/SVOM_FIELD00041. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/42232. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40301] GRB 251013C: GOTO optical afterglow detection
by GCN Circulars 13 Oct '25

13 Oct '25

TITLE: GCN CIRCULAR NUMBER: 42231 SUBJECT: GRB 251013C: GOTO optical afterglow detection DATE: 25/10/13 22:14:00 GMT FROM: Ben Gompertz at U of Birmingham <b.gompertz(a)bham.ac.uk> B. P. Gompertz, B. Godson, D. O'Neill, R. Starling, K. Ackley, M. J. Dyer, J. Lyman, K. Ulaczyk, D. Steeghs, D. K. Galloway, V. Dhillon, G. Ramsay, P. O'Brien, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, and J. Casares report on behalf of the GOTO collaboration: We report on optical observations with the Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022, Dyer et al. 2024) in response to GRB 251013C (Fermi GBM Team, GCN 42221; Rakotondrainibe et al, GCN 42222). Targeted observations were taken at 2025-10-13 21:40:06 UT (4.1h post trigger). The observations consisted of 4x45s exposures in the GOTO L-band (400-700 nm). Images were processed immediately after acquisition using the GOTO pipeline. Difference imaging was performed using deeper template observations. We detect the optical counterpart (Palmerio et al., GCN 42223; Perez-Garcia et al., GCN 42225; Konno et al., GCN 42226; Martin-Carrillo et al., GCN 42227; Masi, GCN 42228; Palmerio et al., GCN 42229; Moskvitin et al., GCN 42230) with an AB magnitude of L = 17.11 ± 0.02 mag. Magnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction. GOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC). View this GCN Circular online at https://gcn.nasa.gov/circulars/42231. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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