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

[vsnet-grb-info 36548] LIGO/Virgo/KAGRA S241210fu: Updated Sky localization
by GCN Circulars 13 Dec '24

13 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38549 SUBJECT: LIGO/Virgo/KAGRA S241210fu: Updated Sky localization DATE: 24/12/13 08:58:43 GMT FROM: Marie Anne Bizouard at ARTEMIS/CNRS <marieanne.bizouard(a)oca.eu> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S241210fu (GCN Circular 38521). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S241210fu For the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 3326 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3603 +/- 1378 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] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040 View this GCN Circular online at https://gcn.nasa.gov/circulars/38549. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36547] Swift GRB 241213A: Global MASTER-Net observations report
by GCN Circulars 13 Dec '24

13 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38548 SUBJECT: Swift GRB 241213A: Global MASTER-Net observations report DATE: 24/12/13 02:56:33 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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 241213A ( R. Gupta et al., GCN 38547) errorbox 1183 sec after notice time and 1208 sec after trigger time at 2024-12-13 02:39:08 UT, with upper limit up to 17.8 mag. The observations began at zenith distance = 38 deg. The sun altitude is -20.1 deg. The galactic latitude b = 26 deg., longitude l = 185 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2708197 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 1289 | MASTER-Kislovodsk | P- | 160 | 17.6 | 1469 | MASTER-Kislovodsk | P- | 520 | 17.8 | Coadd 1467 | MASTER-Kislovodsk | P- | 180 | 16.9 | 1667 | MASTER-Kislovodsk | P- | 180 | 16.4 | The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/38548. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36546] GRB 241213A: Swift detection of a burst
by GCN Circulars 13 Dec '24

13 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38547 SUBJECT: GRB 241213A: Swift detection of a burst DATE: 24/12/13 02:39:47 GMT FROM: K.L. Page at U Leicester <klp5(a)leicester.ac.uk> R. Gupta (NASA GSFC), C. Gronwall (PSU), K. L. Page (U Leicester) and T. Sakamoto (AGU) report on behalf of the Neil Gehrels Swift Observatory Team: At 02:19:00 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 241213A (trigger=1274039). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 116.148, +35.280 which is RA(J2000) = 07h 44m 35s Dec(J2000) = +35d 16' 49" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a bright peak with a duration of about 15 sec. The peak count rate was ~9500 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 02:25:36.0 UT, 395.9 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 116.17145, 35.27944 which is equivalent to: RA(J2000) = 07h 44m 41.15s Dec(J2000) = +35d 16' 46.0" with an uncertainty of 1.9 arcseconds (radius, 90% containment). This location is 68 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (6.66 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 5 (+2.07/-1.84) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 250 seconds with the U filter starting 318 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.060. Burst Advocate for this burst is R. Gupta (rahulbhu.c157 AT gmail.com). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/) View this GCN Circular online at https://gcn.nasa.gov/circulars/38547. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36545] GRB 241212A : SVOM/C-GFT optical upper limit at early phase
by GCN Circulars 13 Dec '24

13 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38546 SUBJECT: GRB 241212A : SVOM/C-GFT optical upper limit at early phase DATE: 24/12/13 00:58:36 GMT FROM: Chao Wu at NAOC <cwu(a)nao.cas.cn> SVOM/C-GFT team: Zhe Kang (CHO), Chao WU (NAOC), Liping Xin(NAOC), Xuhui Han(NAOC), Pinpin Zhang (NAOC), Xiaomeng Lu (NAOC), Zhenwei Li (CHO), You Lv (CHO), Ruosong Zhang (NAOC), Yujie Xiao(NAOC) 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) We observed the field of GRB 241212A (Zhang et. al, GCN 38541; Fermi team GCN 38540;Joshi et al. GCN 38544) starting at 2024-12-12T09:22:45 UT, ~53 sec after the burst trigger with C-GFT. A series of g, r and i band images were obtained with exposure time of 10s. Due to bad observation condition(not good weather, low altitude and ~13.8 deg to the moon), the optical counterpart reported by Qiu et al. (GCN 38545) was not detected in the images. The upper limit at early phase are, (T-T0)_mid(sec) limiting_mag(3sigma) ------------------------------------- 58 15.80 91 16.80 The photometry was calibrated with nearby stars in ucac4. We thank the observation assistant Bowen Li and Chunlei Guo at Jilin observatory for their excellent support. Chinese Ground Follow-up Telescope of SVOM mission is located at Jilin, Changchun Observatory, National Astronomical Observatories, CAS. It has FOV of 1.28 deg x 1.28 deg with a 4k*4k CMOS detector mounted on the primary focus of 1.2-meter-aperure telescope. View this GCN Circular online at https://gcn.nasa.gov/circulars/38546. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36544] GRB 241212A : SVOM/VT bright optical afterglow
by GCN Circulars 12 Dec '24

12 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38545 SUBJECT: GRB 241212A : SVOM/VT bright optical afterglow DATE: 24/12/12 20:40:17 GMT FROM: Liping Xin at NAOC, SVOM <xlp(a)nao.cas.cn> SVOM/VT commissioning team: Y. L. Qiu, H. L. Li, L. P. Xin, C. Wu, 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, J. Zhang, L. J. Dan, G. Y. Zou, C. J. Wang, Y. F. Du, C. Huang (XIOPM), H. Zhou (PMO), Li Zhang (IHEP) 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: The GRB 241212A (Zhang et al., GCN 38541; Fermi GBM team et al., GCN 38540) was observed by on-board SVOM/VT after the automatic slew of the platform. The VT conducted observations in VT_B (400nm-650nm) and VT_R (650nm-1000nm) channel simultaneously. With the X band downlinked data, an uncatalogued optical source was detected in VT_B and VT_R band images within the errorbox in both Eclairs and MXT (Zhang et al., GCN 38541) compared to the Desi D10 catalog. The source is located at RA, Dec = 45.08033, 6.71682, which is equivalent to: RA (J2000) : 03:00:19.28 Dec (J2000): +06:43:00.56 with an uncertainty of 0.2 arcsec. Its brightness was fading for 1.1 magnitude in both of VT_B and VT_R images from 0.7 hours to 4.8 hours after the burst. The magnitude was VT_B = 20.60 mag and VT_R = 19.88 mag in AB magnitude,about 1.15 hr post the trigger. 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/38545. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36543] GRB 241212A: AstroSat CZTI detection
by GCN Circulars 12 Dec '24

12 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38544 SUBJECT: GRB 241212A: AstroSat CZTI detection DATE: 24/12/12 15:45:53 GMT FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar(a)iitb.ac.in> J. Joshi (IUCAA), G. Waratkar (IITB), 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 collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 241212A which was also detected by Fermi/GBM (Fermi-GBM Team, GCN Circ. 38540), and SVOM/ECLAIRs (Li et al., GCN Circ. 38541). The source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-12-12 09:21:49.4 UTC. The measured peak count rate associated with the burst is 238 (+71, -38) counts/s above the background in the combined data of all quadrants, with a total of 1473 (+319, -369) counts. The local mean background count rate was 1331 (+6, -7) counts/s. We measure a T90 of 14 (+1, -6) s from the cumulative Veto light curve. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grbs View this GCN Circular online at https://gcn.nasa.gov/circulars/38544. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36542] GRB 241209B: GRANDMA/TRT upper limit
by GCN Circulars 12 Dec '24

12 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38543 SUBJECT: GRB 241209B: GRANDMA/TRT upper limit DATE: 24/12/12 15:00:34 GMT FROM: marion.pillas(a)ligo.org M. Pillas (ULiege), M. Tanasan, K. Noysena (NARIT), S. Antier (OCA), O. Pyshna (Caltech), N. Guessoum (AUS), A. Klotz (IRAP), C. Andrade (UMN) S. Karpov (FZU), M. Coughlin (UMN), , P. Hello (IJCLAB), P-A Duverne (APC), T. Pradier (Unistra/IPHC), D.Turpin (CEA-Saclay/Irfu), on behalf of the GRANDMA collaboration: We observed the field of GRB 241209B, detected by SVOM/ECLAIRs and GRM (GCN 38478) using TRT-SRO. Observations began 0.209 days after ECLAIRs T0. We didn't detect any optical afterglow candidate with an upper limit of 22 mag in Johnson-R (3 sigma, Vega Mag) Further analysis is required to check consistency with the afterglow candidate of SVOM/VT (GCN 38516). All the data have been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2022). GRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/). View this GCN Circular online at https://gcn.nasa.gov/circulars/38543. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36541] GRB 241207A: TSHAO Zeiss-1000 optical observations
by GCN Circulars 12 Dec '24

12 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38542 SUBJECT: GRB 241207A: TSHAO Zeiss-1000 optical observations DATE: 24/12/12 14:19:10 GMT FROM: Nicolai Pankov at HSE, IKI RAS <colinsergesen(a)gmail.com> N. Pankov (HSE, IKI), I. Reva (FAI), M. Krugov (FAI), A. Pozanenko (IKI) report on behalf of IKI-GRB-FuN: We performed optical observations of GRB 241207A (Fermi GBM team, GCN 38454; V.Lipunov et. al, GCN 38459; McKenna et. al, GCN 38536) in the R filter with 1-meter Zeiss-1000 telescope of Tien-Shan observatory (TSHAO). The observations began on 2024-12-07 13:04:43 UT, i.e. ~0.17 days since trigger. Using STDWeb (Karpov, 2024) ZOGY-based image subtraction against ZTF DR7 we did not find an optical candidate transient in the median stacked images of the fields: FieldID RA Dec Width Height (hr) (deg) (arcmin) 1 19:15:05 +42:01:05 19.03 19.03 2 19:09:58 +42:29:55 19.03 19.03 The preliminary upper limits are as follows: Date UT start t-T0 Exp. Filter OT Err. UL(3sigma) FieldID (mid, days) (s) 2024-12-07 13:04:43 0.176087 4*90 R n/d n/d 20.3 1 2024-12-07 13:15:56 0.206782 48*90 R n/d n/d 20.8 2 The magnitudes were calibrated using nearby stars from USNO-B1.0 (R2 magnitudes) and are not corrected for the Galactic extinction towards the GRB 241207A. View this GCN Circular online at https://gcn.nasa.gov/circulars/38542. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36540] GRB 241212A: SVOM detection of a bright long burst
by GCN Circulars 12 Dec '24

12 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38541 SUBJECT: GRB 241212A: SVOM detection of a bright long burst DATE: 24/12/12 10:40:13 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> Zhang Li (IHEP), Wenjin Xie (NAOC), Nicolas Dagoneau, Stéphane Schanne (CEA), Maria-Grazia Bernardini (INAF, LUPM), Clara Plasse (CEA), Shaolin Xiong (IHEP) report: At 2024-12-12T09:21:49 (Tb) SVOM/ECLAIRs triggered on GRB 241212A (SVOM burst-id sb24121201), also detected by Fermi GBM (GCN Circular 38540). The following trigger information was received on the ground with low-latency by the SVOM VHF Alert Network. A total of 12 Alerts were received from Count-Rate Trigger (CRT) and Image Trigger (IMT). The best Alert was produced by CRT with a signal-to-noise ratio of 35.5 in the 8-120 keV energy band over a time window of 20.48 s starting at Tb. The light curve shows a single broad peak of duration of about 40 s. The localization of the best Alert is RA, Dec = 45.119, 6.701 (J2000) with a 90% C.L. radius of 2.9 arcmin (including a systematic error of 2 arcmin added in quadrature). GRM light curve showed a broad peak structure with a T90 duration of about 40 s. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb241212A.png SVOM slewed automatically to the burst. MXT began observing the field at 2024-12-12T09:24:05, 133 seconds after Tb, during an exposure of 6 seconds, before SAA entry. Using onboard processed data we found one uncatalogued X-ray source located at RA, Dec 45.087, 6.719 degrees with a 90% C.L. radius of 70 arcseconds, corresponding to: RA = 03h 00m 21s Dec = 06° 43' 08" This location is 2.2 arcminutes from the ECLAIRs onboard position. VT began observing the field after the slew. The analysis of the recorded images will be published in a future circular on the follow-up of the SVOM optical instruments. Burst Advocate for this burst is Zhangli (zhangli(a)ihep.ac.cn). Please contact the BA by email if you require additional information regarding the SVOM follow-up of this burst. View this GCN Circular online at https://gcn.nasa.gov/circulars/38541. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36539] GRB 241212A: Fermi GBM Final Real-time Localization
by GCN Circulars 12 Dec '24

12 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38540 SUBJECT: GRB 241212A: Fermi GBM Final Real-time Localization DATE: 24/12/12 09:32:08 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 09:21:48 UT on 12 Dec 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241212A (trigger 755688113.6612 / 241212390). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 44.3, Dec = 6.5 (J2000 degrees, equivalent to J2000 02h 57m, 6d 30'), with a statistical uncertainty of 3.6 degrees. The angle from the Fermi LAT boresight is 40.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241212390/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241212390/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241212390/… View this GCN Circular online at https://gcn.nasa.gov/circulars/38540. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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