August 2024 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 34925] GRB 240805B: BTA optical afterglow candidate
by GCN Circulars 06 Aug '24

06 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37055 SUBJECT: GRB 240805B: BTA optical afterglow candidate DATE: 24/08/06 00:45:23 GMT FROM: Moskvitin Alexander at SAO RAS <mosk(a)sao.ru> A. Moskvitin, D. Oparin, A Vinokurov (SAO RAS), N. Pankov (HSE, IKI) and A. Pozanenko (IKI) report: We observed the field of the GRB 240805B (Williams et al., GCN 37043) with the BTA 6-meter telescope of SAO RAS equipped with the focal reducer Scorpio-I. We obtained 7 x 120 + 30 sec images on August 5, 2024-08-05T19:31:44 -- 2024-08-05T20:10:44 (t_mid - T0 = 8.372 hours). Within the enhanced XRT error circle (Goad et al., GCN 37053) close to its edge we detected a single source with the coordinates (J2000): R. A. = 16:56:51.20 Dec. = +18:19:11.7 +/- 0".5 and brightness of R = 21.62 +/- 0.04 (calibrated against nearby SDSS stars, magnitudes converted with Lupton 2005 equations) and not corrected for Galactic extinction. This source is located near SDSS object J165651.21+181914.0 but significantly brighter, thus it may be GRB OT. View this GCN Circular online at https://gcn.nasa.gov/circulars/37055. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34924] GRB 240805A: SVOM/GRM observation
by GCN Circulars 06 Aug '24

06 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37054 SUBJECT: GRB 240805A: SVOM/GRM observation DATE: 24/08/06 00:04:37 GMT FROM: Chenwei Wang at IHEP <cwwang(a)ihep.ac.cn> SVOM/GRM team: Chen-Wei Wang, Yong-Wei Dong, Jiang-Tao Liu, Shi-Jie Zheng, Jian-Chao Sun, Wen-Jun Tan, Jiang He, Min Gao, Hao-Xuan Guo, Yue Huang, Lu Li, Yong-Ye Li, Hong-Wei Liu, Xin Liu, Hao-Li Shi, Li-Ming Song, You-Li Tuo, Hao-Xi Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Rui-Jie Wang, Yu-Xi Wang, Bo-Bing Wu, Shao-Lin Xiong, Jian-Ying Ye, Yi-Tao Yin, Wen-Hui Yu, Fan Zhang, Li Zhang, Peng Zhang, Shuang-Nan Zhang, Wen-Long Zhang, Yan-Ting Zhang, Shu-Min Zhao, Xiao-Yun Zhao, Chao Zheng (IHEP), Maria-Grazia Bernardini (LUPM/INAF-OAB), Laurent Bouchet (IRAP), David Corre (CEA), Patrick Maeght (LUPM), Frédéric Piron (LUPM) , Stéphane Schanne (CEA), Jingwei Wang (IAP) SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (IHEP), Stéphane Basa (LAM), JeanLuc Attéia (IRAP), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Frédéric Daigne (IAP), Jin-Song Deng (NAOC), 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), Bing Zhang (UNLV) report on behalf of the SVOM team: During the commissioning phase, the SVOM/GRM was triggered by a long GRB 240805A at 2024-08-05T02:02:21.400 UT (T0), which also triggered Fermi/GBM (GCN 37031), Swift/BAT (GCN 37032), INTEGRAL (GCN 37037), and Fermi/LAT (GCN 37042). With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of multiple pulses with a duration of about 12 s. The GRM light curve can be found here: https://www.bursthub.cn/admin/static/svgrb240805A.png At the time of this burst ECLAIRs was not in operational mode. 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. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM point of contact for this burst is: Chen-Wei Wang (IHEP)(cwwang(a)ihep.ac.cn) View this GCN Circular online at https://gcn.nasa.gov/circulars/37054. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34923] GRB 240805B: Enhanced Swift-XRT position
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37053 SUBJECT: GRB 240805B: Enhanced Swift-XRT position DATE: 24/08/05 23:15:38 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 1007 s of XRT Photon Counting mode data and 3 UVOT images for GRB 240805B, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 254.21255, +18.31958 which is equivalent to: RA (J2000): 16h 56m 51.01s Dec (J2000): +18d 19' 10.5" with an uncertainty of 3.1 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/37053. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34922] GRB 240805B: LCOGT Optical Upper Limits
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37052 SUBJECT: GRB 240805B: LCOGT Optical Upper Limits DATE: 24/08/05 19:37:57 GMT FROM: Robert Strausbaugh at Eastern Illinois University <rstrausbaugh(a)eiu.edu> R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration: We observed the Swift GRB 240805B field (Williams et al., GCN 37043) with the LCOGT 1-meter Sinistro instrument at the South African Astronomical Observatory site, on August 5, from 18:01 to 18:34 UT (corresponding to 3.55 to 4.10 hours after the GRB trigger time) with the sdss r and i filters. We performed a series of 3x300s exposures in each band. We do not detect an uncataloged source within the XRT error region in either band. This result is consistent with other optcal upper limits (Zhu et al., GCN 37050; Lipunov et al., GCN 37051). The following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference: r > 21.1 i > 20.5 These magnitudes are not corrected for galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/37052. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34921] Swift GRB 240805B: Global MASTER-Net observations report
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37051 SUBJECT: Swift GRB 240805B: Global MASTER-Net observations report DATE: 24/08/05 19:18:29 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 240805B ( M. A. Williams et al., GCN 37043) errorbox 16180 sec after notice time and 16840 sec after trigger time at 2024-08-05 19:09:34 UT, with upper limit up to 17.1 mag. The observations began at zenith distance = 32 deg. The sun altitude is -19.2 deg. The galactic latitude b = 33 deg., longitude l = 38 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2551783 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 16931 | MASTER-Tavrida | C | 180 | 16.5 | 16931 | MASTER-Tavrida | C | 180 | 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/37051. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34920] GRB 240805B: JinShan optical upper limits
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37050 SUBJECT: GRB 240805B: JinShan optical upper limits DATE: 24/08/05 17:34:05 GMT FROM: Zipei Zhu at NAOC <zpzhu(a)nao.cas.cn> Z.P. Zhu, X. Liu, J. An, S.Y. Fu, S.Q. Jiang, L.B. He, D. Xu (NAOC) report on behalf of a large collaboration: We observed the field of GRB 240805B detected by Swift/BAT (Williams et al., GCN 37043), using the JinShan 100cm-C telescope (100C) and 50cm-D telescope (50D) located at Altay, Xinjiang, China.The observation started at 14:55:19 UT on 2024-08-05, ~ 0.44 hr after the BAT trigger. A series of exposures were obtained in the Sloan g-, r-, i-, and z- filters. No uncataloged source is found within or around the XRT error circle (Williams et al., GCN 37043). The obtained upper limits are as follows: Telescope Tmid-T0/hr Filter Exptime Mag(AB) 100C 0.582 r 5x200s >22.0 100C 0.868 i 5x200s >22.2 100C 1.318 z 7x300s >21.5 50D 1.683 g 20x180s >22.0 We acknowledge the excellent support from S.W. Luo, M.M. Yang, Z.K. Feng, Q.C. Zhao and L.F. Huo for enabling these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/37050. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34919] EP240801a: BTA BVRI photometry
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37049 SUBJECT: EP240801a: BTA BVRI photometry DATE: 24/08/05 17:22:19 GMT FROM: Moskvitin Alexander at SAO RAS <mosk(a)sao.ru> A. Moskvitin, D. Oparin (SAO RAS), N. Pankov (HSE, IKI), A. Pozanenko (IKI) report: We observed the field of the fast X-ray transient EP240801a (Zhou et al., GCN 36997) with the BTA 6-meter telescope of SAO RAS equipped with the focal reducer Scoprio-I on August, 3 (t_mid - T0 = 2.629 days) and August, 4 (t_mid - T0 = 3.485 days). The OT (Fu et al., GCN 36998; Li et al., GCN 36999; Zheng et al., GCN 37000; Aryan et al., GCN 37002; An et al., GCN 37004; Perez-Fournon et al., GCN 37007; Malesani et al., GCN 37008; Zhu et al., GCN 37010; Moskvitin et al., GCNs 37012, 37017; Quirola-Vasquez et al., GCN 37013; Moretti et al., GCN 37014; Turpin et al., GCN 37015; Pankov et al., GCNs 37016, 37040) is clearly detected in stacked frames. Preliminary photometry of OT in the both epochs as is follows. Filter, exp, t_start t_end (UTC) OT, mag s, (UT) (UT) B 620 2024-08-03T23:44:36 -- 2024-08-04T00:37:41 23.88 +/- 0.13 V 600 2024-08-03T23:50:17 -- 2024-08-04T00:33:45 23.13 +/- 0.09 Rc 510 2024-08-03T23:47:46 -- 2024-08-04T00:35:28 22.82 +/- 0.07 Ic 510 2024-08-03T23:52:56 -- 2024-08-04T00:30:14 22.05 +/- 0.10 V 900 2024-08-04T20:28:02 -- 2024-08-04T21:01:52 23.55 +/- 0.08 Rc 930 2024-08-04T20:23:36 -- 2024-08-04T21:03:41 22.91 +/- 0.06 The magnitudes were calibrated against nearby Pan-STARRS stars and not corrected for Galactic extinction. We note significant reddening (V-Rc) between the two epochs. View this GCN Circular online at https://gcn.nasa.gov/circulars/37049. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34918] Fermi GRB 240805A: Global MASTER-Net observations report
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37048 SUBJECT: Fermi GRB 240805A: Global MASTER-Net observations report DATE: 24/08/05 17:15:29 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) 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 240805A ( Fermi GBM team, GCN 37031) errorbox 53052 sec after notice time and 53084 sec after trigger time at 2024-08-05 16:47:04 UT, with upper limit up to 18.5 mag. Observations started at twilight. The observations began at zenith distance = 33 deg. The sun altitude is -9.3 deg. The galactic latitude b = 10 deg., longitude l = 303 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2551244 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 53174 | 2024-08-05 16:47:04 | MASTER-SAAO | (12h 43m 20.61s , -53d 36m 01.3s) | C | 180 | 16.1 | 53354 | 2024-08-05 16:47:04 | MASTER-SAAO | (12h 43m 20.63s , -53d 36m 01.3s) | C | 540 | 17.2 | Coadd 53373 | 2024-08-05 16:50:23 | MASTER-SAAO | (12h 43m 15.26s , -53d 36m 55.1s) | C | 180 | 16.9 | 53573 | 2024-08-05 16:53:42 | MASTER-SAAO | (12h 43m 23.40s , -53d 36m 25.3s) | C | 180 | 17.4 | 53772 | 2024-08-05 16:57:02 | MASTER-SAAO | (12h 43m 20.45s , -53d 34m 46.4s) | C | 180 | 17.9 | 53971 | 2024-08-05 17:00:21 | MASTER-SAAO | (12h 43m 21.17s , -53d 36m 24.1s) | C | 180 | 18.2 | 54171 | 2024-08-05 17:03:41 | MASTER-SAAO | (12h 43m 24.63s , -53d 34m 49.4s) | C | 180 | 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/37048. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34917] Swift GRB 240805A: Global MASTER-Net observations report
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37047 SUBJECT: Swift GRB 240805A: Global MASTER-Net observations report DATE: 24/08/05 16:56:41 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) 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 240805A ( S. Dichiara et al., GCN 37032) errorbox 53063 sec after notice time and 53081 sec after trigger time at 2024-08-05 16:47:04 UT, with upper limit up to 16.1 mag. Observations started at twilight. The observations began at zenith distance = 33 deg. The sun altitude is -9.3 deg. The galactic latitude b = 9 deg., longitude l = 302 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2551196 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 53172 | MASTER-SAAO | C | 180 | 16.1 | 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/37047. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34916] Fermi Gamma-ray Burst Monitor trigger 744558410/240805574 is not a GRB
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37046 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 744558410/240805574 is not a GRB DATE: 24/08/05 16:17:41 GMT FROM: Matt Godwin <msg0028(a)uah.edu> M. Godwin (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 744558410/240805574 at 13:46:45.32 UT on 05 August 2024, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to a Solar Flare" View this GCN Circular online at https://gcn.nasa.gov/circulars/37046. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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