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

[vsnet-grb-info 36837] GRB 250103B: REM optical/NIR upper limits
by GCN Circulars 06 Jan '25

06 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38832 SUBJECT: GRB 250103B: REM optical/NIR upper limits DATE: 25/01/06 15:59:56 GMT FROM: Matteo Ferro at INAF-OAB <matteo.ferro(a)inaf.it> M. Ferro, R. Brivio, P. D’Avanzo, S. Covino, D. Fugazza (INAF-OAB) report on behalf of the REM team: We observed the field of GRB 250103B detected by Swift (Eyles-Ferris et al., GCN 38796), also detected by SVOM (Bouchet et al., GCN 38797) with the REM 60cm robotic telescope located at the ESO observatory of La … [View More]

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[vsnet-grb-info 36836] GRB 250101A: REM optical/NIR counterpart detection
by GCN Circulars 06 Jan '25

06 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38831 SUBJECT: GRB 250101A: REM optical/NIR counterpart detection DATE: 25/01/06 15:58:24 GMT FROM: Matteo Ferro at INAF-OAB <matteo.ferro(a)inaf.it> M. Ferro, R.Brivio, P. D’Avanzo, S. Covino, D. Fugazza (INAF-OAB) report on behalf of the REM team: We observed the field of GRB 250101A, detected by Swift (Page et al., GCN 38752) with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in … [View More]

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[vsnet-grb-info 36835] GRB 250106A: Swift-XRT observations
by GCN Circulars 06 Jan '25

06 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38830 SUBJECT: GRB 250106A: Swift-XRT observations DATE: 25/01/06 14:45:52 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> J.P. Osborne (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. A. Williams (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has … [View More]performed follow-up observations of the SVOM/ECLAIRs-detected burst GRB 250106A (Zhao et al., GCN Circ. 38826), collecting 2.9 ks of Photon Counting (PC) mode data between T0+19.9 ks and T0+27.1 ks. Four uncatalogued X-ray sources have been detected, however none of them is above the RASS limit or shows definitive signs of fading. However, Source 2 was reported by Qiu et al. (GCN Circ. 38829) to be consistent with the position of a SVOM/VT optical candiate. Details of the Swift-XRT sources are given below: Source 1: RA (J2000.0): 117.2387 = 07:48:57.28 Dec (J2000.0): +63.8123 = +63:48:44.3 Error: 3.0 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: 0.0209 +/- 0.0032 ct s^-1 Distance: 205 arcsec from SVOM/ECLAIRs position. Flux: (5.99 +/- 0.91)e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 2: RA (J2000.0): 117.3686 = 07:49:28.47 Dec (J2000.0): +63.7079 = +63:42:28.6 Error: 5.9 arcsec (radius, 90% conf.) Count-rate: (5.7 [+2.1, -1.7])e-3 ct s^-1 Distance: 411 arcsec from SVOM/ECLAIRs position. Flux: (4.1 [+1.5, -1.2])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 3: RA (J2000.0): 116.9049 = 07:47:37.18 Dec (J2000.0): +63.9115 = +63:54:41.5 Error: 6.5 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: (4.5 [+1.9, -1.5])e-3 ct s^-1 Distance: 642 arcsec from SVOM/ECLAIRs position. Flux: (3.1 [+1.3, -1.0])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 4: RA (J2000.0): 117.2096 = 07:48:50.31 Dec (J2000.0): +63.8218 = +63:49:18.4 Error: 7.1 arcsec (radius, 90% conf.) Count-rate: (2.4 [+1.4, -1.0])e-3 ct s^-1 Distance: 207 arcsec from SVOM/ECLAIRs position. Flux: (7.3 [+4.2, -3.1])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV) 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/ToO_GRBs/00021753. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/38830. --- 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 36834] GRB 250106A: SVOM/VT optical candidate
by GCN Circulars 06 Jan '25

06 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38829 SUBJECT: GRB 250106A: SVOM/VT optical candidate DATE: 25/01/06 11:51:02 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> SVOM/VT commissioning team: Y. L. Qiu, H. L. Li, C. Wu, D. H. Zhao, L. P. Xin, X. H. Han, J. Wang, W. J. Xie, H. B. Cai, Y. Xu, Y. J. Xiao, P. P. Zhang, J. S. Deng, L. Lan, X. M. Lu, R. S. Zhang, Z. H. Yao (NAOC), J. Zhang, L. J. Dan, G. Y. Zou, C. J. Wang, Y. F. Du, C. Huang (XIOPM) SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand … [View More]Cordier (CEA), Shuang-Nan Zhang (IHEP), Stéphane Basa (LAM), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Frédéric Daigne (IAP), Jin-Song Deng (NAOC), Olivier Godet (IRAP), Andrea Goldwurm (APC), Diego Götz (CEA), Xu-Hui Han (NAOC), Cyril Lachaud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Paris), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC), Shao-Lin Xiong (IHEP), Bing Zhang (UNLV) report on behalf of the SVOM team: The SVOM/VT conducted observations of GRB 250106A (Zhao et al., GCN 38826) after the automatic slew of the platform. The observations were carried out in VT_B (400nm-650nm) and VT_R (650nm-1000nm) channel simultaneously. In the stacked VT_R image with an exposure time of 14*100 sec, an uncatalogued source was detected in the errorbox of XRT source #2(P. A. Evans et al., GCN 38828), while no any new source was detected within the errorbox of XRT source #1, compared to Pan-STARRS catalog. The brightness of the uncatalogued source was VT_R=22.5+/-0.3 mag in AB miniguide at the mid time of 0.965 hours after the burst. The source was not detected in VT_B stacked image with a 3 sigma limit of 23.3 mag at the mid time of 0.966 hours after the burst. The source is located at RA, Dec = 117.37078 63.70817 deg, which is equivalent to: RA (J2000) : 07:49:28.99 Dec (J2000): +63:42:29.4 with an uncertainty of 0.5 arcsec. More deep follow-ups are encouraged for the nature of the source. 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/38829. --- 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 36833] GRB 250106A: Swift ToO observations
by GCN Circulars 06 Jan '25

06 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38828 SUBJECT: GRB 250106A: Swift ToO observations DATE: 25/01/06 08:03:23 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the SVOM/ECLAIRs GRB 250106A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021753 Any uncatalogued X-ray sources detected in this analysis will be reported … [View More]

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[vsnet-grb-info 36832] GRB 250106A: Swift ToO observations
by GCN Circulars 06 Jan '25

06 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38828 SUBJECT: GRB 250106A: Swift ToO observations DATE: 25/01/06 08:03:23 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the SVOM/ECLAIRs GRB 250106A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021753 Any uncatalogued X-ray sources detected in this analysis will be reported … [View More]

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[vsnet-grb-info 36831] The EP-WXT trigger 01709129925 is likely a flaring star
by GCN Circulars 06 Jan '25

06 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38827 SUBJECT: The EP-WXT trigger 01709129925 is likely a flaring star DATE: 25/01/06 04:00:07 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> W. Chen (NAO, CAS) , Q. C. Shui (IHEP, CAS), H. He, S. K. Yang (WHU), C. C. Jin (NAO, CAS) report on behalf of the Einstein Probe team: The EP-WXT trigger (ID 01709129925) on 2025-01-05 20:53:30 (UTC) is likely a stellar flare associated with a High Proper Motion Star 1RXS J060224.9-163451. The estimated … [View More]

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[vsnet-grb-info 36830] GRB 250106A: SVOM detection of a long burst
by GCN Circulars 06 Jan '25

06 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38826 SUBJECT: GRB 250106A: SVOM detection of a long burst DATE: 25/01/06 03:58:22 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> D.-H. ZHAO, C. WU, W.-J. XIE (NAOC, CAS), D. Turpin (CEA), S. Guillot (IRAP), D. Götz (CEA), C-W. Wang (IHEP) report on behalf of the SVOM team. The SVOM/ECLAIRs telescope triggered and located the long duration GRB 250106A (sb25010601) starting at 2025-01-06T02:29:19.972 UTC (Tb). The following trigger information … [View More]

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[vsnet-grb-info 36829] Fermi trigger No 757753930: Global MASTER-Net observations report
by GCN Circulars 06 Jan '25

06 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38825 SUBJECT: Fermi trigger No 757753930: Global MASTER-Net observations report DATE: 25/01/06 01:45:37 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-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 GRB250105.30 (trigger No 757753930,15h 29m 04.08s , -16d 52m 58.8s, R=34.18) errorbox 1051 sec after notice time and 1074 sec after trigger time at 2025-01-05 07:30:00 UT, with upper limit up to 23.5 mag. The observations began at zenith distance = 42 deg. The sun altitude is -22.7 deg. MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB250105.30 errorbox 62179 sec after notice time and 62203 sec after trigger time at 2025-01-06 00:28:48 UT, with upper limit up to 18.3 mag. The observations began at zenith distance = 76 deg. The sun altitude is -30.0 deg. The galactic latitude b = 31 deg., longitude l = 349 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2734281 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 1105 | 2025-01-05 07:30:00 | MASTER-OAFA | (13h 16m 13.38s , -34d 52m 57.3s) | C | 60 | 20.4 | 1165 | 2025-01-05 07:30:00 | MASTER-OAFA | (13h 16m 13.37s , -34d 52m 57.4s) | C | 180 | 23.5 | Coadd 1180 | 2025-01-05 07:31:15 | MASTER-OAFA | (13h 16m 16.70s , -34d 51m 22.8s) | C | 60 | 20.4 | 1257 | 2025-01-05 07:32:32 | MASTER-OAFA | (13h 16m 10.26s , -34d 52m 03.5s) | C | 60 | 20.4 | 2047 | 2025-01-05 07:45:43 | MASTER-OAFA | (13h 16m 15.75s , -34d 51m 34.1s) | C | 60 | 20.4 | 2107 | 2025-01-05 07:45:43 | MASTER-OAFA | (13h 16m 15.75s , -34d 51m 34.0s) | C | 180 | 23.5 | Coadd 2123 | 2025-01-05 07:46:58 | MASTER-OAFA | (13h 16m 10.78s , -34d 52m 32.3s) | C | 60 | 20.4 | 2198 | 2025-01-05 07:48:13 | MASTER-OAFA | (13h 16m 15.88s , -34d 52m 10.2s) | C | 60 | 20.5 | 3048 | 2025-01-05 08:02:23 | MASTER-OAFA | (13h 16m 12.72s , -34d 52m 04.6s) | C | 60 | 20.5 | 3108 | 2025-01-05 08:02:23 | MASTER-OAFA | (13h 16m 12.72s , -34d 52m 04.6s) | C | 180 | 23.5 | Coadd 3126 | 2025-01-05 08:03:41 | MASTER-OAFA | (13h 16m 14.60s , -34d 50m 31.0s) | C | 60 | 20.5 | 3202 | 2025-01-05 08:04:57 | MASTER-OAFA | (13h 16m 09.57s , -34d 51m 26.5s) | C | 60 | 20.5 | 62208 | 2025-01-06 00:28:48 | MASTER-SAAO | (15h 54m 02.18s , -48d 37m 26.9s) | C | 10 | 17.2 | 62242 | 2025-01-06 00:29:17 | MASTER-SAAO | (15h 54m 02.27s , -48d 37m 24.0s) | C | 20 | 17.7 | 62281 | 2025-01-06 00:29:56 | MASTER-SAAO | (15h 54m 02.28s , -48d 37m 21.9s) | C | 20 | 17.6 | 62325 | 2025-01-06 00:30:35 | MASTER-SAAO | (15h 54m 02.35s , -48d 37m 19.8s) | C | 30 | 17.8 | 62379 | 2025-01-06 00:31:24 | MASTER-SAAO | (15h 54m 02.34s , -48d 37m 18.9s) | C | 40 | 18.0 | 62443 | 2025-01-06 00:32:23 | MASTER-SAAO | (15h 54m 02.28s , -48d 37m 17.6s) | C | 50 | 18.1 | 62596 | 2025-01-06 00:34:51 | MASTER-SAAO | (15h 54m 02.21s , -48d 37m 17.2s) | C | 60 | 18.3 | 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/38825. --- 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 36828] GRB 241229A: SVOM/VT optical upperlimit
by GCN Circulars 05 Jan '25

05 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38824 SUBJECT: GRB 241229A: SVOM/VT optical upperlimit DATE: 25/01/05 15:07:00 GMT FROM: Liping Xin at NAOC, SVOM <xlp(a)nao.cas.cn> SVOM/VT commissioning team: Y. L. Qiu, H. L. Li (NAOC), Y. F. Liang (PMOC), A. Li, Z. M. Wang (BNU), L. P. Xin, C. Wu, X. H. Han, J. Wang, W. J. Xie, H. B. Cai, Y. Xu, Y. J. Xiao, P. P. Zhang, J. S. Deng, L. Lan, X. M. Lu, R. S. Zhang, Z. H. Yao (NAOC), J. Zhang, L. J. Dan, G. Y. Zou, C. J. Wang, Y. F. Du, C. Huang (… [View More]

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