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

[vsnet-grb-info 34865] EP240801a: TRT optical counterpart detection
by GCN Circulars 01 Aug '24

01 Aug '24

TITLE: GCN CIRCULAR NUMBER: 36998 SUBJECT: EP240801a: TRT optical counterpart detection DATE: 24/08/01 14:58:20 GMT FROM: Dong Xu at NAOC/CAS <dxu(a)nao.cas.cn> S.Y. Fu, J. An (NAOC), S. Tinyanont, R. Anutarawiramkul, P. Butpan (NARIT), X. Liu, S.Q. Jiang, Z.P. Zhu, D. Xu, Z. Fan, W.X. Li, N.C. Sun, Y.N. Wang (NAOC) report on behalf of a large collaboration: We observed the field of EP240801a detected by Einstein Probe (EP, Zhou et al., GCN 36997), using the 0.7-m telescope of … [View More]

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[vsnet-grb-info 34864] EP240801a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
by GCN Circulars 01 Aug '24

01 Aug '24

TITLE: GCN CIRCULAR NUMBER: 36997 SUBJECT: EP240801a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient DATE: 24/08/01 14:46:45 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> H. Zhou (PMO, CAS), W. X. Wang, J. W. Hu, Z. X. Ling, C. C. Jin, Y. Liu, C. Zhang, H. Q. Cheng, W. Chen, C. Z. Cui, D. W. Fan, H. B. Hu, M. H. Huang, D. Y. Li, H. Y. Liu, M. J. Liu, Z. Z. Lv, T. Y. Lian, X. Mao, H. W. Pan, X. Pan, H. Sun, Y. L. Wang, Q. Y. Wu, X. P. Xu, Y. F. Xu,… [View More] H. N. Yang, W. Yuan, M. Zhang, W. D. Zhang, W. J. Zhang, Z. Zhang, D. H. Zhao (NAOC, CAS), Y. Chen, S. M. Jia, 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 (trigger ID: 01709015181), designated EP240801a, by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission. The transient event started at 2024-08-01T09:06:03 (UTC). The position of the source is R.A. = 345.140 deg, DEC = 32.610 deg (J2000) with an uncertainty of 2.4 arcmin in radius (90% C.L. statistical and systematic). The transient event lasts for more than 80 seconds. The lightcurve of the transient observed by the WXT exhibits a rapid brightening profile. The average 0.5-4 keV spectrum can be fitted by an absorbed power law with a photon index of 1.9(+/-0.9) (with a free column density value of 3.1(+/-3.1) x 10^21 cm^-2). The derived average unabsorbed 0.5-4 keV flux is 4.8(+/-3.1) x 10^-10 erg/s/cm^2. The uncertainties are at the 90% confidence level for the above parameters. The autonomous EP-FXT follow-up observation started about 180s after the WXT trigger, and the observation clearly shows an uncatalogued X-ray source located at R.A. = 345.1630 deg, DEC = 32.5927 deg (J2000) with an uncertainty of 10 arcsec in radius (90% C.L. statistical and systematic). The 0.5-10 keV light curve of the transient decays smoothly and lasts about 200s since the start time of the autonomous follow-up observation. The average 0.5-10 keV spectrum can be fitted by an absorbed power law with a photon index of 3.2(+/-0.4) (with a free column density value of 1.5(+/-0.7) x 10^21 cm^-2), giving an average unabsorbed flux of 1.5(+/-0.3) x 10^-11 erg/s/cm^2. 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/36997. --- 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 34863] EP240801a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
by GCN Circulars 01 Aug '24

01 Aug '24

TITLE: GCN CIRCULAR NUMBER: 36997 SUBJECT: EP240801a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient DATE: 24/08/01 14:46:45 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> H. Zhou (PMO, CAS), W. X. Wang, J. W. Hu, Z. X. Ling, C. C. Jin, Y. Liu, C. Zhang, H. Q. Cheng, W. Chen, C. Z. Cui, D. W. Fan, H. B. Hu, M. H. Huang, D. Y. Li, H. Y. Liu, M. J. Liu, Z. Z. Lv, T. Y. Lian, X. Mao, H. W. Pan, X. Pan, H. Sun, Y. L. Wang, Q. Y. Wu, X. P. Xu, Y. F. Xu,… [View More] H. N. Yang, W. Yuan, M. Zhang, W. D. Zhang, W. J. Zhang, Z. Zhang, D. H. Zhao (NAOC, CAS), Y. Chen, S. M. Jia, 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 (trigger ID: 01709015181), designated EP240801a, by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission. The transient event started at 2024-08-01T09:06:03 (UTC). The position of the source is R.A. = 345.140 deg, DEC = 32.610 deg (J2000) with an uncertainty of 2.4 arcmin in radius (90% C.L. statistical and systematic). The transient event lasts for more than 80 seconds. The lightcurve of the transient observed by the WXT exhibits a rapid brightening profile. The average 0.5-4 keV spectrum can be fitted by an absorbed power law with a photon index of 1.9(+/-0.9) (with a free column density value of 3.1(+/-3.1) x 10^21 cm^-2). The derived average unabsorbed 0.5-4 keV flux is 4.8(+/-3.1) x 10^-10 erg/s/cm^2. The uncertainties are at the 90% confidence level for the above parameters. The autonomous EP-FXT follow-up observation started about 180s after the WXT trigger, and the observation clearly shows an uncatalogued X-ray source located at R.A. = 345.1630 deg, DEC = 32.5927 deg (J2000) with an uncertainty of 10 arcsec in radius (90% C.L. statistical and systematic). The 0.5-10 keV light curve of the transient decays smoothly and lasts about 200s since the start time of the autonomous follow-up observation. The average 0.5-10 keV spectrum can be fitted by an absorbed power law with a photon index of 3.2(+/-0.4) (with a free column density value of 1.5(+/-0.7) x 10^21 cm^-2), giving an average unabsorbed flux of 1.5(+/-0.3) x 10^-11 erg/s/cm^2. 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/36997. --- 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 34862] GRB 240801B: AstroSat CZTI detection of a bright long burst
by GCN Circulars 01 Aug '24

01 Aug '24

TITLE: GCN CIRCULAR NUMBER: 36996 SUBJECT: GRB 240801B: AstroSat CZTI detection of a bright long burst DATE: 24/08/01 10:32:32 GMT FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar(a)iitb.ac.in> A. Dasgupta (BITS Pilani, Hyderabad), S. Srijan (IITB), G. Waratkar (IITB), M. Tembhurnikar (IUCAA), J. Joshi (IUCAA), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI … [View More]

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[vsnet-grb-info 34861] Fermi GRB 240801A: Global MASTER-Net observations report
by GCN Circulars 01 Aug '24

01 Aug '24

TITLE: GCN CIRCULAR NUMBER: 36995 SUBJECT: Fermi GRB 240801A: Global MASTER-Net observations report DATE: 24/08/01 03:30:35 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]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 240801A ( Fermi GBM team, GCN 36994) errorbox 85 sec after notice time and 135 sec after trigger time at 2024-08-01 03:20:24 UT, with upper limit up to 18.7 mag. The observations began at zenith distance = 58 deg. The sun altitude is -27.0 deg. The galactic latitude b = -36 deg., longitude l = 138 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2547674 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 150 | 2024-08-01 03:20:24 | MASTER-SAAO | (01h 33m 53.08s , +25d 33m 16.7s) | C | 30 | 18.7 | 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/36995. --- 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 34860] GRB 240801A: Fermi GBM Final Real-time Localization
by GCN Circulars 01 Aug '24

01 Aug '24

TITLE: GCN CIRCULAR NUMBER: 36994 SUBJECT: GRB 240801A: Fermi GBM Final Real-time Localization DATE: 24/08/01 03:28:41 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 03:18:09 UT on 1 Aug 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240801A (trigger 744175094.739542 / 240801138). The on-ground calculated location, using the Fermi GBM trigger data, is RA = … [View More]

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