April 2025 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 38316] SVOM/sb25043004: SVOM detection of a X-ray transient
by GCN Circulars 30 Apr '25

30 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40287 SUBJECT: SVOM/sb25043004: SVOM detection of a X-ray transient DATE: 25/04/30 11:39:06 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> Y. Liang (PMO), W. Zheng (Berkeley), O. Godet, S. Guillot (IRAP), C. Plasse, J. T. Palmerio (CEA) on behalf of the SVOM mission team. SVOM/ECLAIRs triggered and located the X-ray transient sb25043004 (SVOM burst-id sb25043004) starting at 2025-04-30T10:40:57.1 UTC (Tb). The following trigger information was … [View More]

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[vsnet-grb-info 38315] Fermi trigger No 767623859: Global MASTER-Net observations report
by GCN Circulars 30 Apr '25

30 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40286 SUBJECT: Fermi trigger No 767623859: Global MASTER-Net observations report DATE: 25/04/30 09:31:00 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. … [View More]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 GRB250429.54 (trigger No 767623859,22h 03m 43.92s , -05d 28m 01.2s, R=31.13) errorbox 73850 sec after notice time and 73884 sec after trigger time at 2025-04-30 09:22:19 UT, with upper limit up to 19.5 mag. The observations began at zenith distance = 42 deg. The sun altitude is -22.3 deg. The galactic latitude b = -45 deg., longitude l = 55 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2856527 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 73905 | 2025-04-30 09:22:19 | MASTER-OAFA | (21h 58m 38.65s , -10d 46m 32.6s) | C | 40 | 17.6 | 73915 | 2025-04-30 09:22:19 | MASTER-OAFA | (22h 07m 54.27s , -10d 23m 06.7s) | C | 60 | 19.2 | 73983 | 2025-04-30 09:23:37 | MASTER-OAFA | (22h 01m 48.50s , -14d 36m 44.5s) | C | 40 | 17.8 | 73993 | 2025-04-30 09:23:37 | MASTER-OAFA | (22h 11m 12.61s , -14d 13m 10.4s) | C | 60 | 19.5 | 74058 | 2025-04-30 09:24:53 | MASTER-OAFA | (22h 13m 36.90s , -16d 29m 55.1s) | C | 40 | 18.0 | 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/40286. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 38314] EP250428b: refined analysis of the EP-FXT follow-up observation
by GCN Circulars 30 Apr '25

30 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40285 SUBJECT: EP250428b: refined analysis of the EP-FXT follow-up observation DATE: 25/04/30 09:16:55 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Q. Y. Wu, M. J. Liu, T. Zhao, Y. J. Song (NAO, CAS), H. Z. Wu (HUST), C. C. Jin (NAO, CAS) on behalf of the Einstein Probe (EP) team: After the EP-WXT detection of the fast X-ray transient EP250428b (Liu et al., GCN 40277), a follow-up observation was performed by EP-FXT at 2025-04-29T14:04:00 (UTC), … [View More]

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[vsnet-grb-info 38313] EP250428b: GROWTH-India telescope optical upper limit
by GCN Circulars 30 Apr '25

30 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40284 SUBJECT: EP250428b: GROWTH-India telescope optical upper limit DATE: 25/04/30 07:54:42 GMT FROM: anirudhsalgundi(a)gmail.com A. Salgundi (IITB), V. Swain (IITB), D. Eappachen (IIA), A.P. Saikia (IITB), V. Bhalerao (IITB), G.C. Anupama (IIA), S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team: We observed the field of the EP250428b (Liu et al., GCN #40277) with the 0.7m GROWTH-India Telescope (GIT). Observation started at 2025-04-… [View More]

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[vsnet-grb-info 38312] EP250428b: SVOM/VT upper limit
by GCN Circulars 30 Apr '25

30 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40283 SUBJECT: EP250428b: SVOM/VT upper limit DATE: 25/04/30 01:39:45 GMT FROM: Liping Xin at NAOC, SVOM <xlp(a)nao.cas.cn> L. P. Xin, Y. L. Qiu, H. L. Li, C. Wu, Z. H. Yao(NAOC), M. J. Liu, Q. Y. Wu, T. Zhao, Y. J. Song (NAO, CAS), H. Z. Wu (HUST), C. C. Jin (NAO, CAS), X. H. Han,Y. Xu, J. Wang, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. S. Deng, J. Y. Wei (NAOC) report on behalf of the SVOM team and the Einstein Probe (EP) team: SVOM/… [View More]

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[vsnet-grb-info 38311] EP250428b: SAO RAS optical upper limit
by GCN Circulars 29 Apr '25

29 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40282 SUBJECT: EP250428b: SAO RAS optical upper limit DATE: 25/04/29 23:39:13 GMT FROM: Alexander Moskvitin at SAO RAS <mosk(a)sao.ru> A. S. Moskvitin, O. I. Spiridonova (SAO RAS) report on behalf of the GRB follow-up team. We observed the field of the X-ray transient EP250428b (Liu et al., GCN 40277) with the SAO RAS 1-m telescope Zeiss-1000 on April 29, 20:47:38--21:28:24 UT (t_mid - T0 = 1.6267 days). We obtained 7 x 300 sec. images in Rc band. … [View More]

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[vsnet-grb-info 38310] EP250428b: LAST optical upper limit
by GCN Circulars 29 Apr '25

29 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40281 SUBJECT: EP250428b: LAST optical upper limit DATE: 25/04/29 21:33:20 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), S. Spitzer (WIS), and K. Rybicki (WIS) on behalf of … [View More]

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[vsnet-grb-info 38309] IceCube-250429A - IceCube observation of a high-energy neutrino candidate track-like event
by GCN Circulars 29 Apr '25

29 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40280 SUBJECT: IceCube-250429A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 25/04/29 19:07:06 GMT FROM: Giacomo Sommani at Ruhr-Universität Bochum <gsommani(a)icecube.wisc.edu> The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 25-04-29 at 15:23:15.63 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. The event was selected by the … [View More]

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[vsnet-grb-info 38308] GRB 250427A: Swift/UVOT Detection
by GCN Circulars 29 Apr '25

29 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40279 SUBJECT: GRB 250427A: Swift/UVOT Detection DATE: 25/04/29 18:59:07 GMT FROM: Mike Siegel at PSU/Swift MOC <mhs18(a)psu.edu> M. H. Siegel (PSU) reports on behalf of the Swift UVOT team: Swift/UVOT observed the field of GRB 250427A detected by Einstein Probe (Wang et al., GCN Circ. 40257) starting 22.9 ks after the burst. A fading optical source was detected in the U-band consistent with the position of the uncatalogued X-ray source detected by … [View More]

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[vsnet-grb-info 38307] EP250428b: Global MASTER-Net observations report
by GCN Circulars 29 Apr '25

29 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40278 SUBJECT: EP250428b: Global MASTER-Net observations report DATE: 25/04/29 18:09:39 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.… [View More] 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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the EP250428b ( EP Team et al., GCN 40277) errorbox 285 sec after notice time and 1 days 41608 sec after trigger time at 2025-04-29 17:38:59 UT, with upper limit up to 17.6 mag. Observations started at twilight. The observations began at zenith distance = 64 deg. The sun altitude is -15.2 deg. The galactic latitude b = 53 deg., longitude l = 355 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2856874 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 128038 | 2025-04-29 17:38:59 | MASTER-Kislovodsk | (14h 39m 56.30s , +02d 18m 36.2s) | C | 60 | 17.1 | 128993 | 2025-04-29 17:54:54 | MASTER-Kislovodsk | (14h 39m 58.93s , +02d 19m 39.5s) | C | 60 | 17.5 | 129172 | 2025-04-29 17:57:52 | MASTER-Kislovodsk | (14h 39m 52.83s , +02d 19m 59.5s) | C | 60 | 17.6 | 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/40278. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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