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

[vsnet-grb-info 34905] EP-WXT trigger 00109017646 is not a real source
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37036 SUBJECT: EP-WXT trigger 00109017646 is not a real source DATE: 24/08/05 06:46:13 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Y. Wang (PMO, CAS), H. Sun, Y. L. Wang, W. D. Zhang (NAOC, CAS), on behalf of the Einstein Probe team The EP-WXT trigger 00109017646 at 01:17:15 UTC on 5th August 2024, is not a real source. View this GCN Circular online at https://gcn.nasa.gov/circulars/37036. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34904] EP240804a: NOT optical counterpart detection
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37035 SUBJECT: EP240804a: NOT optical counterpart detection DATE: 24/08/05 05:07:21 GMT FROM: Zipei Zhu at NAOC <zpzhu(a)nao.cas.cn> J. An, S.Y. Fu, S.Q. Jiang, X. Liu, Z.P. Zhu, D. Xu (NAOC), J.P.U. Fynbo (DAWN/NBI), B.N. Hauptmann (NOT) report on behalf of a large collaboration: We observed the field of EP240804a detected by Einstein Probe (EP, Wang et al., GCN 37034), using the ALFOSC instrument mounted on the Nordic Optical Telescope (NOT), with … [View More]

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[vsnet-grb-info 34903] EP240804a: NOT optical counterpart detection
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37035 SUBJECT: EP240804a: NOT optical counterpart detection DATE: 24/08/05 05:07:21 GMT FROM: Zipei Zhu at NAOC <zpzhu(a)nao.cas.cn> J. An, S.Y. Fu, S.Q. Jiang, X. Liu, Z.P. Zhu, D. Xu (NAOC), J.P.U. Fynbo (DAWN/NBI), B.N. Hauptmann (NOT) report on behalf of a large collaboration: We observed the field of EP240804a detected by Einstein Probe (EP, Wang et al., GCN 37034), using the ALFOSC instrument mounted on the Nordic Optical Telescope (NOT), with … [View More]

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[vsnet-grb-info 34902] EP240804a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37034 SUBJECT: EP240804a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient DATE: 24/08/05 04:39:24 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Y. Wang (PMO, CAS), H. Sun, Y. L. Wang, W. D. Zhang, Y. Liu, H. W. Pan, Z. X. Ling, C. C. Jin, C. Zhang, H. Q. Cheng, W. Chen, C. Z. Cui, D. W. Fan, H. B. Hu, J. W. Hu, M. H. Huang, D. Y. Li, H. Y. Liu, M. J. Liu, Z. Z. Lv, T. Y. Lian, X. Mao, X. Pan, W. X. Wang, Y. L. Wang, Q. … [View More]Y. Wu, X. P. Xu, Y. F. Xu, H. N. Yang, W. Yuan, M. Zhang, W. J. Zhang, Z. Zhang, D. H. Zhao (NAOC, CAS), Y. Chen, S. M. Jia, W. W. Cui, D. W. Han, C. K. Li, L. M. Song, X. F. Zhao, J. Zhang, S. N. Zhang (IHEP, CAS), E. Kuulkers, A. Santovincenzo (ESA), P. O'Brien (Univ. of Leicester), K. Nandra, A. Rau (MPE), B. Cordier (CEA) on behalf of the Einstein Probe team We report on the detection of a fast X-ray transient designated EP240804a, by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission. The transient started at 2024-08-04T21:36:53(UTC) and triggered the WXT on-board processing unit (trigger ID: 01709017305). The WXT position of EP240804a is R.A.= 337.644 deg, DEC = -39.121 deg (J2000) with an uncertainty of 4 arcmin (radius, 90% C.L. statistical and systematic). The lightcurve of the transient observed by the WXT lasts more than 100 seconds. The average 0.5-4 keV spectrum can be fitted with an absorbed power law with a photon index of 0.7(-0.4, +1.2) (with a freely fitted column density value of 1.1(-1.0, +37.0) x 10^20 cm^-2). The derived average unabsorbed 0.5-4 keV flux is 6.1(-1.6, +2.6) x 10^(-10) erg/s/cm^2. The EP-FXT automonous follow-up observation started at 2024-08-04T21:41:15 (UTC). The observation clearly shows an uncatalogued X-ray source located at R.A. = 337.6638 deg, DEC = -39.1243 deg (J2000) with an uncertainty of 10 arcsec in radius (90% C.L. statistical and systematic). The FXT light curve shows significant variability. The average 0.5-10 keV spectrum can be fitted by an absorbed power law with a photon index of 1.6(+/-0.1) (with a free column density value of 2.8(+/-2.7) x 10^20 cm^-2), giving an average unabsorbed flux of 2.2(+/-0.1) x 10^(-11) erg/s/cm^2. The uncertainties are at the 90% confidence level for the above parameters. No previously known bright X-ray sources are found within the error circle around the source position. Further follow-up observations are encouraged to identify the nature of this X-ray transient. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). View this GCN Circular online at https://gcn.nasa.gov/circulars/37034. --- 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 34901] EP240802a: correction of EP-WXT trigger time in GCN 37019
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37033 SUBJECT: EP240802a: correction of EP-WXT trigger time in GCN 37019 DATE: 24/08/05 03:42:18 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Y. L. Wang (NAOC, CAS), A. Li (BNU), W. X. Wang, H. W. Pan (NAOC,CAS) on behalf of the Einstein Probe team The trigger time of EP240802a given in GCN 37019 is incorrect. The correct time is 2024-08-02T10:32:52 (UTC). This correction has also been implemented in GCN 37019. We apologize for the mistake. … [View More]

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[vsnet-grb-info 34900] GRB 240805A: Swift detection of a burst
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37032 SUBJECT: GRB 240805A: Swift detection of a burst DATE: 24/08/05 02:26:17 GMT FROM: David Palmer at LANL <palmer(a)lanl.gov> S. Dichiara (PSU), R. Gupta (NASA GSFC) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team: At 02:02:22 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 240805A (trigger=1246907). Swift slewed immediately to the burst but the observations was cut short almost … [View More]

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[vsnet-grb-info 34899] GRB 240805A: Fermi GBM Final Real-time Localization
by GCN Circulars 05 Aug '24

05 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37031 SUBJECT: GRB 240805A: Fermi GBM Final Real-time Localization DATE: 24/08/05 02:12:51 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 LONG GRB At 02:02:20 UT on 5 Aug 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240805A (trigger 744516145.309414 / 240805085). The on-ground calculated location, using the Fermi GBM trigger data, is RA = … [View More]

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[vsnet-grb-info 34898] Fermi GRB 240804A: Global MASTER-Net observations report
by GCN Circulars 04 Aug '24

04 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37030 SUBJECT: Fermi GRB 240804A: Global MASTER-Net observations report DATE: 24/08/04 21:45:40 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]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) started inspect of the Fermi GRB 240804A ( Fermi GBM team, GCN 37028) errorbox 6897 sec after notice time and 6928 sec after trigger time at 2024-08-04 21:01:30 UT, with upper limit up to 18.8 mag. The observations began at zenith distance = 28 deg. The sun altitude is -28.0 deg. The galactic latitude b = 31 deg., longitude l = 88 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2550987 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 6958 | 2024-08-04 21:01:30 | MASTER-Tavrida | (17h 39m 17.27s , +59d 19m 52.2s) | C | 60 | 18.8 | 7031 | 2024-08-04 21:02:43 | MASTER-Tavrida | (17h 55m 03.48s , +59d 20m 47.9s) | C | 60 | 18.8 | 7105 | 2024-08-04 21:03:57 | MASTER-Tavrida | (17h 39m 16.68s , +60d 39m 25.4s) | C | 60 | 18.8 | 7179 | 2024-08-04 21:05:11 | MASTER-Tavrida | (17h 55m 45.65s , +60d 38m 06.5s) | C | 60 | 18.6 | 7252 | 2024-08-04 21:06:24 | MASTER-Tavrida | (17h 39m 49.96s , +58d 01m 30.8s) | C | 60 | 18.6 | 7326 | 2024-08-04 21:07:38 | MASTER-Tavrida | (17h 54m 55.38s , +58d 03m 00.5s) | C | 60 | 18.7 | 8707 | 2024-08-04 21:30:39 | MASTER-Tavrida | (17h 39m 17.26s , +59d 20m 03.8s) | C | 60 | 17.6 | 8781 | 2024-08-04 21:31:52 | MASTER-Tavrida | (17h 55m 06.57s , +59d 18m 47.5s) | C | 60 | 18.0 | 8854 | 2024-08-04 21:33:06 | MASTER-Tavrida | (17h 39m 18.91s , +60d 36m 09.1s) | C | 60 | 17.9 | 8927 | 2024-08-04 21:34:19 | MASTER-Tavrida | (17h 55m 47.90s , +60d 36m 21.2s) | C | 60 | 17.3 | 9001 | 2024-08-04 21:35:33 | MASTER-Tavrida | (17h 39m 48.79s , +58d 02m 10.2s) | C | 60 | 15.9 | 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/37030. --- 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 34897] EP240802a: Montarrenti Observatory optical upper limit
by GCN Circulars 04 Aug '24

04 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37029 SUBJECT: EP240802a: Montarrenti Observatory optical upper limit DATE: 24/08/04 20:41:01 GMT FROM: Simone Leonini at Montarrenti Observatory (Siena, Italy) <s.leonini(a)iol.it> S. Leonini, M. Conti, P. Rosi, L.M. Tinjaca Ramirez (Montarrenti Observatory, Siena, Italy, part of UAI/SSV-GRB section), M.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo University, Institute of Astronomy), K. Kalinowski (Aarhus University, … [View More]

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[vsnet-grb-info 34896] GRB 240804A: Fermi GBM Final Real-time Localization
by GCN Circulars 04 Aug '24

04 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37028 SUBJECT: GRB 240804A: Fermi GBM Final Real-time Localization DATE: 24/08/04 19:16:43 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 LONG GRB At 19:06:02 UT on 4 Aug 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240804A (trigger 744491167.353348 / 240804796). The on-ground calculated location, using the Fermi GBM trigger data, is RA = … [View More]

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