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

[vsnet-grb-info 37446] EP250223a: Global MASTER-Net observations report
by GCN Circulars 23 Feb '25

23 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39434 SUBJECT: EP250223a: Global MASTER-Net observations report DATE: 25/02/23 18:36:57 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.… [View More]

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[vsnet-grb-info 37445] GRB 250221A: VLA radio detection
by GCN Circulars 23 Feb '25

23 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39433 SUBJECT: GRB 250221A: VLA radio detection DATE: 25/02/23 18:32:23 GMT FROM: Roberto Ricci at INAF-IRA <ricci(a)ira.inaf.it> R. Ricci (U Rome), E. Troja (U Rome) report on behalf of a larger collaboration: We observed the GRB 250221A discovered by Swift/BAT (Caputo et al. GCN 39396) with the Very Large Array at the centre frequency of 10 GHz (X-band) with a bandwidth of 4 GHz at a mid time of 1.95 days after the trigger. A weak source is … [View More]

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[vsnet-grb-info 37444] Fermi GRB 250223A: Global MASTER-Net observations report
by GCN Circulars 23 Feb '25

23 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39432 SUBJECT: Fermi GRB 250223A: Global MASTER-Net observations report DATE: 25/02/23 18:31:10 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta,… [View More] R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), 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 250223A ( Fermi GBM team, GCN 39430) errorbox 6037 sec after notice time and 6071 sec after trigger time at 2025-02-23 18:17:23 UT, with upper limit up to 17.8 mag. Observations started at twilight. The observations began at zenith distance = 81 deg. The sun altitude is -12.4 deg. The galactic latitude b = -61 deg., longitude l = 358 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2788279 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 6101 | 2025-02-23 18:17:23 | MASTER-SAAO | (21h 30m 33.95s , -55d 53m 54.3s) | C | 60 | 16.5 | 6180 | 2025-02-23 18:18:42 | MASTER-SAAO | (21h 44m 51.61s , -55d 55m 08.8s) | C | 60 | 16.9 | 6260 | 2025-02-23 18:20:01 | MASTER-SAAO | (21h 48m 30.70s , -54d 02m 03.5s) | C | 60 | 16.9 | 6339 | 2025-02-23 18:21:20 | MASTER-SAAO | (22h 02m 01.64s , -54d 00m 54.6s) | C | 60 | 17.2 | 6419 | 2025-02-23 18:22:40 | MASTER-SAAO | (21h 57m 39.63s , -55d 54m 33.4s) | C | 60 | 17.4 | 6498 | 2025-02-23 18:23:59 | MASTER-SAAO | (22h 11m 47.32s , -55d 55m 37.0s) | C | 60 | 17.8 | 6577 | 2025-02-23 18:25:18 | MASTER-SAAO | (22h 06m 14.56s , -52d 07m 28.6s) | C | 60 | 17.5 | 6656 | 2025-02-23 18:26:38 | MASTER-SAAO | (22h 19m 06.47s , -52d 08m 45.6s) | C | 60 | 17.8 | 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/39432. --- 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 37443] Fermi trigger No 762020305: Global MASTER-Net observations report
by GCN Circulars 23 Feb '25

23 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39431 SUBJECT: Fermi trigger No 762020305: Global MASTER-Net observations report DATE: 25/02/23 16:46:54 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, … [View More]F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), 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 (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB250223.68 (trigger No 762020305,17h 30m 28.80s , +41d 02m 24.0s, R=5.1) errorbox 569 sec after notice time and 603 sec after trigger time at 2025-02-23 16:28:23 UT, with upper limit up to 16.6 mag. The observations began at zenith distance = 74 deg. The sun altitude is -47.4 deg. The galactic latitude b = 32 deg., longitude l = 66 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2788242 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 632 | 2025-02-23 16:28:23 | MASTER-Tunka | (17h 31m 26.47s , +40d 50m 52.7s) | C | 55 | 15.9 | 687 | 2025-02-23 16:28:23 | MASTER-Tunka | (17h 31m 26.50s , +40d 50m 52.7s) | C | 165 | 16.5 | Coadd 691 | 2025-02-23 16:29:22 | MASTER-Tunka | (17h 31m 26.58s , +40d 50m 54.0s) | C | 55 | 16.1 | 749 | 2025-02-23 16:30:21 | MASTER-Tunka | (17h 31m 26.76s , +40d 50m 55.4s) | C | 55 | 16.6 | 810 | 2025-02-23 16:31:19 | MASTER-Tunka | (17h 31m 27.02s , +40d 50m 55.5s) | C | 60 | 14.9 | 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/39431. --- 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 37442] GRB 250223A: Fermi GBM Final Real-time Localization
by GCN Circulars 23 Feb '25

23 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39430 SUBJECT: GRB 250223A: Fermi GBM Final Real-time Localization DATE: 25/02/23 16:46:39 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 16:36:11 UT on 23 Feb 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250223A (trigger 762021376.807148 / 250223692). The on-ground calculated location, using the Fermi GBM trigger data, is RA … [View More]

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[vsnet-grb-info 37441] EP250223a: Einstein Probe detection of an X-ray transient
by GCN Circulars 23 Feb '25

23 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39429 SUBJECT: EP250223a: Einstein Probe detection of an X-ray transient DATE: 25/02/23 16:22:43 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> T. Y. Lian, W. J. Zhang (NAOC, CAS), Y. Wang (PMO, CAS), X. Tian (GXU), R. Z. Li(YNAO, CAS), H. W. Pan (NAOC, CAS) report on behalf of the Einstein Probe team: We report on the detection of an X-ray transient by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission, designated … [View More]

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[vsnet-grb-info 37440] LIGO/Virgo/KAGRA S250206dm: Upper limits from IceCube neutrino searches
by GCN Circulars 23 Feb '25

23 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39428 SUBJECT: LIGO/Virgo/KAGRA S250206dm: Upper limits from IceCube neutrino searches DATE: 25/02/23 15:10:32 GMT FROM: Jessie Thwaites at IceCube/U Wisc-Madison <thwaites(a)wisc.edu> IceCube Collaboration (http://icecube.wisc.edu/) reports: IceCube has performed an additional search [1] for track-like muon neutrino events consistent with the sky localization of gravitational-wave candidate S250206dm in a time range of -0.1 day, +14 days from the … [View More]alert event time (2025-02-06 19:01:30.439 UTC to 2025-02-20 21:25:30.439 UTC). During this time period IceCube was collecting good quality data. In this case, we report a p-value of 0.85, consistent with no significant excess of track events. IceCube's sensitivity assuming an E^-2 spectrum (E^2 dN/dE) to neutrino point sources within the locations spanned by the 90% spatial containment of the 7-Update map ranges from 0.028 to 1.010 GeV cm^-2 in this time window. Searches for track-like muon neutrino events detected by IceCube consistent with the 7-Update skymap in a time range of 1000 seconds centered on the alert event time (2025-02-06 21:17:10.436 UTC to 2025-02-06 21:33:50.436 UTC) were also performed using two hypothesis tests. [1,2]. The first search is a maximum likelihood analysis which searches for a generic point-like neutrino source coincident with the given GW skymap. The second uses a Bayesian approach to quantify the joint GW + neutrino event significance, which assumes a binary merger scenario and accounts for known astrophysical priors, such as GW source distance, in the significance estimate [3]. For these searches we report an overall p-value of 0.021 for the generic transient search and 0.044 for the Bayesian search using the 7-Update map. These p-values measure the consistency of the observed track-like events with the known atmospheric backgrounds for this single map (not trials corrected for multiple GW events). These results are updated since GCN 39176 with the updated skymap. Further details are available at https://gcn.nasa.gov/missions/icecube. Additional details and updates will be posted at https://roc.icecube.wisc.edu/public/LvkNuTrackSearch/. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc(a)icecube.wisc.edu. [1] Abbasi et al. Astrophys.J. 944 (2023) 1, 80 [2] M. G. Aartsen et al 2020 ApJL 898 L10 [3] I. Bartos et al. 2019 Phys. Rev. D 100, 083017 View this GCN Circular online at https://gcn.nasa.gov/circulars/39428. --- 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 37439] GRB 250221A: continued Assy optical observations, brightening afterglow confirmation
by GCN Circulars 23 Feb '25

23 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39427 SUBJECT: GRB 250221A: continued Assy optical observations, brightening afterglow confirmation DATE: 25/02/23 11:51:11 GMT FROM: Alexei Pozanenko at IKI, Moscow <grb.alex(a)gmail.com> N. Pankov (HSE, IKI), V. Kim (FAI), M. Krugov (FAI), Y. Aimuratov (FAI), A. Volnova(IKI), A. Pozanenko (IKI) report on behalf of IKI GRB FuN: We observed the optical afterglow (Francile et al., GCN 39395; Watson et al., GCN 39397; Melandri et al., GCN 39406; … [View More]

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[vsnet-grb-info 37438] GRB 250221A: continued Mondy optical observations, brightening afterglow
by GCN Circulars 23 Feb '25

23 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39426 SUBJECT: GRB 250221A: continued Mondy optical observations, brightening afterglow DATE: 25/02/23 11:47:30 GMT FROM: Alexei Pozanenko at IKI, Moscow <grb.alex(a)gmail.com> N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunlo (ISZF), A. Volnova (IKI) report on behalf of IKI GRB FuN: We observed the optical afterglow (Francile et al., GCN 39395; Watson et al., GCN 39397; Melandri et al., GCN 39406; Shilling et al., GCN 39409; Guo et al., GCN 39412;… [View More]

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[vsnet-grb-info 37437] GRB 250221A: Optical counterpart detection by LCO.
by GCN Circulars 22 Feb '25

22 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39425 SUBJECT: GRB 250221A: Optical counterpart detection by LCO. DATE: 25/02/22 15:06:17 GMT FROM: ankur ghosh at CAPP, University of Johannesburg <ghosh.ankur1994(a)gmail.com> Ankur Ghosh, Soebur Razzaque (CAPP, University of Johannesburg), Alexander Moskvitin, Yulia Sotnikova (SAO RAS), Naveen Dukiya (ARIES), Rahul Gupta (NASA GSFC) on behalf of a larger collaboration. We observed the field of the GRB 250221A triggered by Swift (Caputo et al., … [View More]

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