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

[vsnet-grb-info 35235] GRB 240828A: KAIT Optical Afterglow Candidate
by GCN Circulars 29 Aug '24

29 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37339 SUBJECT: GRB 240828A: KAIT Optical Afterglow Candidate DATE: 24/08/29 16:28:18 GMT FROM: Weikang Zheng at UC Berkeley <weikang(a)berkeley.edu> WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, observed the field of GRB 240828A (The Fermi GBM team, GCN 37317; Srijan et al., GCN 37328) around the Fermi/LAT position (… [View More]

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[vsnet-grb-info 35234] GRB 240825A: SVOM/VT optical detection
by GCN Circulars 29 Aug '24

29 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37338 SUBJECT: GRB 240825A: SVOM/VT optical detection DATE: 24/08/29 14:56:40 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> SVOM/VT commissioning team: Y. L.Qiu, L. P. Xin, H. L. Li, C. Wu, X. H. Han, H. B. Cai, Y. Xu, Y. J. Xiao, P. P. Zhang, L. Lan, W. J. Xie, X. M. Lu, R. S. Zhang, D. W. Xu, G. W. Li (NAOC), J. Zhang, L. J. Dan, G. Y. Zou, C. J. Wang, Y. F. Du, C. Huang (XIOPM) and P.Jesse (CEA). SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier … [View More](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 of SVOM mission, we observed the field of the GRB 240825A (The Fermi GBM team,GCN 37273; Gupta et al., GCN 37274; Lalla et al., GCN 37288; Evans et al., 37290; Gropp et al., GCN 37294; Joshi et al., GCN 37298; Sharma et al., GCN 37301; Frederiks et al., GCN 37302; Wang and Xiong, GCN 37315) with SVOM/VT telescope started at 2024-08-26T18:16:41.50 UT (about 26.4 hours after the burst) in ToO mode. VT made the observations with two channels simultaneously, VT_B (400nm-650nm) and VT_R (650nm-1000nm). The optical afterglow (Gupta et al., GCN 37274; Jiang et al., GCN 37275; Dutton et al., GCN 37276; Odeh et al., GCN 37277, Zhang et al., GCN 37278; Li et al., GCN 37280, Izzo et al., GCN 37287; Lipunov et al., GCN 37289; Leonini et al., GCN 37291; Wu et al., GCN 37292; Martin-Carrillo et al., GCN 37293; Brivio et al., GCN 37295; Kuin et al., GCN 37296; Odeh et al., GCN 37299; Le Floc'h et al., GCN 37300; Guiffreda et al., GCN 37303, Zheng et al., GCN 37304, Wang et al., GCN 37306, Maksut et al., GCN 37307; Melandri et al., GCN 37310, Romanov, GCN 37335, Moskvitin et al., GCN37336) was detected in the VT stacked images, the magnitudes obtained by VT were: VT_B = 22.39 +/-0.2 mag, and VT_R = 21.12 +/-0.1 mag in AB magnitude. More detailed analysis is ongoing. 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 is an optical telescope on board SVOM with an aperture of 44 cm, designed to automatically follow the Eclairs triggers. It has two channels: VT_B and VT_R, covering wavelengths from 400 nm to 650 nm and 650 nm to 1000 nm, respectively. The two bands are observed simultaneously. 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/37338. --- 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 35233] GRB 240828A: Swift-XRT afterglow detection
by GCN Circulars 29 Aug '24

29 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37337 SUBJECT: GRB 240828A: Swift-XRT afterglow detection DATE: 24/08/29 12:58:35 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> A.P. Beardmore (U. Leicester), B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB), M. Ferro (INAF-OAB), J.A. Kennea (PSU), D.N. Burrows (PSU), M. A. Williams (PSU), J.P. Osborne (U. Leicester) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations … [View More]of the Fermi/LAT-detected burst GRB 240828A in a series of observations tiled on the sky. The total exposure time is 3.3 ks, distributed over 3 tiles; the maximum exposure at a single sky location was 2.3 ks. The data were collected between T0+42.1 ks and T0+60.2 ks, and are entirely in Photon Counting (PC) mode. Six uncatalogued X-ray sources are detected, of which one ("Source 3") is above the RASS 3-sigma upper limit at this position, and is therefore likely the GRB afterglow. The position of this source is RA, Dec=225.5130, +36.5285 which is equivalent to: RA (J2000): 15:02:3.12 Dec(J2000): +36:31:42.5 with an uncertainty of 3.9 arcsec (radius, 90% confidence). This position is 6.8 arcmin from the Fermi/LAT position. The light curve can be modelled with a power-law decay with a decay index of alpha=3.043 (+0.027, -0.580). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.47 (+0.33, -0.24). The best-fitting absorption column is consistent with the Galactic value of 1.3 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (3.8 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.3 (+/-6.6) x 10^20 cm^-2 Galactic foreground: 1.3 x 10^20 cm^-2 Excess significance: <1.6 sigma Photon index: 1.47 (+0.33, -0.24) If the light curve continues to decay with a power-law decay index of 3.043, the count rate at T+24 hours will be 0.014 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.3 x 10^-13 (5.3 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00021707. The results of the full analysis of the tiled XRT observations are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00127. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/37337. --- 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 35232] GRB 240825A: further SAO RAS optical observations
by GCN Circulars 29 Aug '24

29 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37336 SUBJECT: GRB 240825A: further SAO RAS optical observations DATE: 24/08/29 09:58:26 GMT FROM: Moskvitin Alexander at SAO RAS <mosk(a)sao.ru> A. S. Moskvitin and O. I. Spiridonova (SAO RAS) report on behalf of the GRB follow-up team. We observed the field of the GRB 240825A (The Fermi GBM team, GCN 37273; Gupta et al., GCN 37274; Lalla et al., GCN 37288; Evans et al., 37290; Gropp et al., GCN 37294; Joshi et al., GCN 37298; Sharma et al., GCN … [View More]

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[vsnet-grb-info 35231] GRB 240825A: further SAO RAS optical observations
by GCN Circulars 29 Aug '24

29 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37336 SUBJECT: GRB 240825A: further SAO RAS optical observations DATE: 24/08/29 09:58:26 GMT FROM: Moskvitin Alexander at SAO RAS <mosk(a)sao.ru> A. S. Moskvitin and O. I. Spiridonova (SAO RAS) report on behalf of the GRB follow-up team. We observed the field of the GRB 240825A (The Fermi GBM team, GCN 37273; Gupta et al., GCN 37274; Lalla et al., GCN 37288; Evans et al., 37290; Gropp et al., GCN 37294; Joshi et al., GCN 37298; Sharma et al., GCN … [View More]

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[vsnet-grb-info 35230] GRB 240825A: iTelescope optical observations
by GCN Circulars 29 Aug '24

29 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37335 SUBJECT: GRB 240825A: iTelescope optical observations DATE: 24/08/29 04:47:21 GMT FROM: Filipp Dmitrievich Romanov at Amateur astronomer <filipp.romanov.27.04.1997(a)gmail.com> I observed the field of GRB 240825A (Gupta et al., GCN Circ. 37274) remotely using telescope T73 (0.356-m f/7.2 Corrected Dall-Kirkham + CMOS) of iTelescope.Net (located in Deep Sky Chile at Rio Hurtado Valley, Chile) on 2024-08-26. Five images (exposure times of 300 … [View More]

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[vsnet-grb-info 35229] GRB 240828B: Swift-XRT afterglow detection
by GCN Circulars 29 Aug '24

29 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37334 SUBJECT: GRB 240828B: Swift-XRT afterglow detection DATE: 24/08/29 04:13:41 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB), S. Dichiara (PSU), J.A. Kennea (PSU), D.N. Burrows (PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up … [View More]observations of the SVOM/ECLAIRs-detected burst GRB 240828B, collecting 2.9 ks of Photon Counting (PC) mode data between T0+13.5 ks and T0+25.0 ks. Two uncatalogued X-ray sources are detected, of which one ("Source 1") is above the RASS 3-sigma upper limit at this position, and is therefore likely the GRB afterglow. Using 2142 s of PC mode data and 3 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 63.45995, +16.71561 which is equivalent to: RA (J2000): 04h 13m 50.39s Dec(J2000): +16d 42' 56.2" with an uncertainty of 2.6 arcsec (radius, 90% confidence). This position is 5.5 arcmin from the SVOM/ECLAIRs position. The light curve can be modelled with a power-law decay with a decay index of alpha=1.8 (+/-0.9). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.8 (+0.5, -0.4). The best-fitting absorption column is 6.2 (+3.7, -2.7) x 10^21 cm^-2, in excess of the Galactic value of 2.9 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.7 x 10^-11 (7.2 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 6.2 (+3.7, -2.7) x 10^21 cm^-2 Galactic foreground: 2.9 x 10^21 cm^-2 Excess significance: 1.9 sigma Photon index: 1.8 (+0.5, -0.4) If the light curve continues to decay with a power-law decay index of 1.8, the count rate at T+24 hours will be 3.6 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.7 x 10^-13 (2.6 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00021706. The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/ToO_GRBs/00021706. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/37334. --- 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 35228] GRB 240828B: Swift-XRT afterglow detection
by GCN Circulars 29 Aug '24

29 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37334 SUBJECT: GRB 240828B: Swift-XRT afterglow detection DATE: 24/08/29 04:13:41 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB), S. Dichiara (PSU), J.A. Kennea (PSU), D.N. Burrows (PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up … [View More]observations of the SVOM/ECLAIRs-detected burst GRB 240828B, collecting 2.9 ks of Photon Counting (PC) mode data between T0+13.5 ks and T0+25.0 ks. Two uncatalogued X-ray sources are detected, of which one ("Source 1") is above the RASS 3-sigma upper limit at this position, and is therefore likely the GRB afterglow. Using 2142 s of PC mode data and 3 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 63.45995, +16.71561 which is equivalent to: RA (J2000): 04h 13m 50.39s Dec(J2000): +16d 42' 56.2" with an uncertainty of 2.6 arcsec (radius, 90% confidence). This position is 5.5 arcmin from the SVOM/ECLAIRs position. The light curve can be modelled with a power-law decay with a decay index of alpha=1.8 (+/-0.9). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.8 (+0.5, -0.4). The best-fitting absorption column is 6.2 (+3.7, -2.7) x 10^21 cm^-2, in excess of the Galactic value of 2.9 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.7 x 10^-11 (7.2 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 6.2 (+3.7, -2.7) x 10^21 cm^-2 Galactic foreground: 2.9 x 10^21 cm^-2 Excess significance: 1.9 sigma Photon index: 1.8 (+0.5, -0.4) If the light curve continues to decay with a power-law decay index of 1.8, the count rate at T+24 hours will be 3.6 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.7 x 10^-13 (2.6 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00021706. The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/ToO_GRBs/00021706. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/37334. --- 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 35227] GRB 240829A: Swift detection of a burst
by GCN Circulars 29 Aug '24

29 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37333 SUBJECT: GRB 240829A: Swift detection of a burst DATE: 24/08/29 04:05:21 GMT FROM: David Palmer at LANL <palmer(a)lanl.gov> S. Laha (GSFC/UMBC), K. L. Page (U Leicester), D. M. Palmer (LANL) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team: At 03:56:28 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 240829A (trigger=1251252). Swift did not slew to the burst due to an observing … [View More]

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[vsnet-grb-info 35226] Swift GRB240829.16: Global MASTER-Net observations report
by GCN Circulars 29 Aug '24

29 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37332 SUBJECT: Swift GRB240829.16: Global MASTER-Net observations report DATE: 24/08/29 04:02:35 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,… [View More]

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