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

[vsnet-grb-info 36372] Swift GRB 241128A: Global MASTER-Net observations report
by GCN Circulars 29 Nov '24

29 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38380 SUBJECT: Swift GRB 241128A: Global MASTER-Net observations report DATE: 24/11/29 10:38:36 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, 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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB 241128A ( R. Brivio et al., GCN 38367) errorbox 65606 sec after notice time and 65649 sec after trigger time at 2024-11-29 10:28:43 UT, with upper limit up to 19.3 mag. Observations started at twilight. The observations began at zenith distance = 43 deg. The sun altitude is -12.6 deg. The galactic latitude b = 21 deg., longitude l = 61 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2687409 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 65694 | MASTER-Tunka | C | 90 | 19.1 | 65798 | MASTER-Tunka | C | 90 | 19.2 | 65887 | MASTER-Tunka | C | 60 | 19.3 | 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/38380. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36371] Fermi-LAT gamma-ray observations of IceCube-241127A
by GCN Circulars 29 Nov '24

29 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38379 SUBJECT: Fermi-LAT gamma-ray observations of IceCube-241127A DATE: 24/11/29 10:03:28 GMT FROM: Leo Pfeiffer at University of Würzburg <pfeiffer.leo(a)gmail.com> L. Pfeiffer (Univ. of Wuerzburg), S. Buson (DESY, Univ. of Wuerzburg), C. Bartolini (INFN Bari), S. Garrappa (Weizmann Institute of Science) and J. Sinapius (DESY) and P. M. Veres (Ruhr University Bochum) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the high-energy IC241127A neutrino event (GCN 38349) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 2024-11-27 14:11:14.42 UTC (T0) with J2000 position RA = 164.09 (+0.46, -0.52) deg, Decl. = 5.38 (+0.58, -0.55) deg 90% PSF containment. No cataloged gamma-ray sources are found within the 90% IC241127A localization error (The Fourth Fermi-LAT catalog, 4FGL-DR4, The Fermi-LAT collaboration 2023, arXiv:2307.12546). We searched for the existence of intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (>5sigma) new excess emission (> 100 MeV) within the IC241127A 90% confidence localization. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IceCube best-fit position, the >100 MeV flux upper limit (95% confidence) is <3.09e-10 ph cm^-2 s^-1 for ~16-years (2008-08-04 / T0), <1.67e-08(<9.31e-08) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0. Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this source will continue. For this source, the Fermi-LAT contact person is L. Pfeiffer (leonard.pfeiffer at stud-mail.uni-wuerzburg.de). The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. View this GCN Circular online at https://gcn.nasa.gov/circulars/38379. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36370] EP241126a: SVOM/VT observations
by GCN Circulars 29 Nov '24

29 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38378 SUBJECT: EP241126a: SVOM/VT observations DATE: 24/11/29 03:41:17 GMT FROM: Huali Li at at NAOC, SVOM <lhl(a)nao.cas.cn> SVOM/VT commissioning team: Y. L. Qiu, L. P. Xin, C. Wu, H. L. Li, 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, (NAOC), J. Zhang, L. J. Dan, G. Y. Zou, C. J. Wang, Y. F. Du, C. Huang (XIOPM), H. Zhou (PMO), L. Zhang (IHEP), Y.D. Hu(GXU), X.L. Chen (YNU), K. Chatterjee (YNU) SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand 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: VT started to observe the fast X-ray transient EP241126a (EP-WXT，Hu et al., GCN 38335；EP-FXT，Zheng et al., GCN 38339; SVOM/GRM, Zheng et al., GCN 38342) in ToO mode from 2024-11-28T02:02:37.5 UT, about 30.38 hours after the burst. The VT conducted observations in VT_B band (400-650nm) and VT_R band (650-1000nm) simultaneously. The optical counterpart (TRT, Fu et al., GCN 38337; GSP, Li et al., GCN 38338; WFST, Geng et al, GCN 38357) was detected in VT_R combined image with the brightness of 22.95 +/- 0.15 mag at the midtime of 33.27 hours after the burst. It was not detected in VT_B combined image, with the 3 sigma limit magnitudes of VT_B~24.1 mag. The exposure time of images in VT_R and VT_B are 5670 sec and 5760 sec respectively. 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/38378. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36369] LIGO/Virgo/KAGRA S241129aa: Identification of a GW compact binary merger candidate
by GCN Circulars 29 Nov '24

29 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38377 SUBJECT: LIGO/Virgo/KAGRA S241129aa: Identification of a GW compact binary merger candidate DATE: 24/11/29 03:05:20 GMT FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar(a)iitb.ac.in> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We identified the compact binary merger candidate S241129aa during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2024-11-29 02:18:32.610 UTC (GPS time: 1416881930.610). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], PyCBC Live [5], and SPIIR [6] analysis pipelines. S241129aa is an event of interest because its false alarm rate, as estimated by the online analysis, is 4e-20 Hz, or about one in 1e12 years. The event's properties can be found at this URL: https://gracedb.ligo.org/superevents/S241129aa The classification of the GW signal, in order of descending probability, is BBH (>99%), BNS (<1%), NSBH (<1%), or Terrestrial (<1%). Assuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [7] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [7] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%. Two sky maps are available at this time and can be retrieved from the GraceDB event page: * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [8], distributed via GCN notice about 34 seconds after the candidate event time. * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [8], distributed via GCN notice about 5 minutes after the candidate event time. The preferred sky map at this time is bayestar.multiorder.fits,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 502 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2287 +/- 548 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/. [1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004 [2] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018 [3] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625 [4] Aubin et al. CQG 38, 095004 (2021) doi:10.1088/1361-6382/abe913 [5] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a [6] Chu et al. PRD 105, 024023 (2022) doi:10.1103/PhysRevD.105.024023 [7] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe [8] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013 View this GCN Circular online at https://gcn.nasa.gov/circulars/38377. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36368] GRB 241128A: Swift-XRT refined Analysis
by GCN Circulars 29 Nov '24

29 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38376 SUBJECT: GRB 241128A: Swift-XRT refined Analysis DATE: 24/11/29 01:47:12 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> J.A. Kennea (PSU), D.N. Burrows (PSU), M. A. Williams (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB) and P.A. Evans report on behalf of the Swift-XRT team: We have analysed 6.2 ks of XRT data for GRB 241128A, from 3.9 ks to 28.3 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The light curve can be modelled with a power-law decay with a decay index of alpha=0.51 (+/-0.15). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.07 (+0.31, -0.25). The best-fitting absorption column is 8.9 (+7.5, -2.9) x 10^20 cm^-2, consistent with the Galactic value of 6.0 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 3.2 x 10^-11 (4.0 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 8.9 (+7.5, -2.9) x 10^20 cm^-2 Galactic foreground: 6.0 x 10^20 cm^-2 Excess significance: <1.6 sigma Photon index: 2.07 (+0.31, -0.25) If the light curve continues to decay with a power-law decay index of 0.51, the count rate at T+24 hours will be 0.017 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.6 x 10^-13 (6.9 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/01270999. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/38376. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36367] GRB 241129A: Fermi GBM Final Real-time Localization
by GCN Circulars 29 Nov '24

29 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38375 SUBJECT: GRB 241129A: Fermi GBM Final Real-time Localization DATE: 24/11/29 01:42:13 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 01:31:33 UT on 29 Nov 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241129A (trigger 754536698.4246 / 241129064). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 245.5, Dec = 1.1 (J2000 degrees, equivalent to J2000 16h 22m, 1d 06'), with a statistical uncertainty of 5.0 degrees. The angle from the Fermi LAT boresight is 75.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241129064/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241129064/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241129064/… View this GCN Circular online at https://gcn.nasa.gov/circulars/38375. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36366] GRB 241128A: Enhanced Swift-XRT position
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38374 SUBJECT: GRB 241128A: Enhanced Swift-XRT position DATE: 24/11/28 23:56:21 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team. Using 1910 s of XRT Photon Counting mode data and 3 UVOT images for GRB 241128A, 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 = 273.72356, +33.43915 which is equivalent to: RA (J2000): 18h 14m 53.65s Dec (J2000): +33d 26' 20.9" with an uncertainty of 3.0 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/38374. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36365] GRB 241128A: NOT optical observations
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38373 SUBJECT: GRB 241128A: NOT optical observations DATE: 24/11/28 22:59:25 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University <d.malesani(a)astro.ru.nl> B. Gompertz (Birmingham), D. B. Malesani (DAWN/NBI and Radboud Univ.), L. Izzo (INAF/OACN, DARK/NBI), J. H. Terwel (NOT and TCD) report on behalf of a larger collaboration: We observed the field of GRB 241128A (Brivio et al., GCN 38367; Page, GCN 38368) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations were carried out at large airmass and under a poor seeing of 2.5". A total of 3x300 s and 5x200 s were secured in the SDSS r and z bands, respectively. From a preliminary reduction of the data, the optical afterglow (Hu et al., GCN 38371; Izzo & Malesani, GCN 38372) is well detected in our images. We measure r = 19.52 +- 0.03 AB on Nov 28.80 UT (2.95 hr after the GRB); z = 19.03 +- 0.05 AB on Nov 28.81 UT (3.25 hr after the GRB). Both magnitudes are calibrated against nearby objects from the Pan-STARRS catalog. We note a discrepancy in the r-band magnitude compared to the nearly simultaneous measurement by Izzo & Malesani (GCN 38372), which we are unable to account for at the present time. View this GCN Circular online at https://gcn.nasa.gov/circulars/38373. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36364] GRB 241128A: LCO optical detection
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38372 SUBJECT: GRB 241128A: LCO optical detection DATE: 24/11/28 21:48:43 GMT FROM: luca.izzo(a)inaf.it L. Izzo (INAF-OACn and DARK/NBI), and D. B. Malesani (DAWN/NBI and Radboud Univ.) report: We observed the field of GRB 241128A (Brivio et al., GCN #38367) with the Sinistro instrument mounted on the 1-m telescope of the LCO network, located at the Teide Observatory, Spain. Observations started on 2024 November 28 at 19:04 UT (2.83 hr after the GRB trigger). We obtained a series of 3x300 s images in the SDSS-r filter. The afterglow reported by Hu et al. (GCN #38371; see also Page et al., GCN #38368) is well detected in our images. We measure a preliminary magnitude of r = 19.24 +/- 0.07 mag (AB), calibrated against nearby stars from the Pan-STARRS catalog. This project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 101004719. View this GCN Circular online at https://gcn.nasa.gov/circulars/38372. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36363] GRB 241128A: 1.5m OSN optical afterglow detection
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38371 SUBJECT: GRB 241128A: 1.5m OSN optical afterglow detection DATE: 24/11/28 21:15:38 GMT FROM: Youdong HU at INAF-OAB <huyoudong072(a)hotmail.com> Y.-D. Hu (INAF-OAB), V. Casanova, E. Fernandez-Garcia, A. J. Castro-Tirado, S.-Y. Wu, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy (IAA-CSIC) and G. Garcia-Segura (UNAM), on behalf of a larger collaboration, report: Following the detection of GRB 241128A by Swift (Brivio et al. GCN 38367), we triggered the 1.5m OSN telescope in Granada (Spain) starting on Nov 28, 18:19 UT (~2.1 hrs post burst) in R & I-bands. An uncatalogued object is detected within the XRT error circle (Page et al. GCNC 38368) with R=19.3+-0.1 mag, at coordinates RA(J2000) = 18:14:53.55, DEC(J2000) = +33:26:20.32, which we proposed as the GRB 241128A optical afterglow. Spectroscopic observations are encouraged. We thank the staff at OSN for their excellent support. View this GCN Circular online at https://gcn.nasa.gov/circulars/38371. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0