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

[vsnet-grb-info 36362] LIGO/Virgo S241127aj: GRANDMA/FRAM-CTA-N Observations
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38370 SUBJECT: LIGO/Virgo S241127aj: GRANDMA/FRAM-CTA-N Observations DATE: 24/11/28 19:18:52 GMT FROM: Thomas Hussenot-Desenonges at IJCLab <thomas.hussenot(a)ijclab.in2p3.fr> T. Hussenot-Desenonges (IJCLAB), D. Akl (AUS), M. Coughlin (UMN), M. Molham (NRIAG), S. Agayeva (Shamakhy Obs.), S. Antier (OCA), C. Andrade (UMN), S. Karpov (FZU), I. Tosta e Melo (UniCT-DFA), P. Hello (IJCLAB), P-A Duverne (APC), T. Pradier (Unistra/IPHC), N. Guessoum (AUS), M. Masek (FZU), on behalf of the GRANDMA collaboration: We performed tiled observations of the LIGO/VIRGO event S241127aj (GCN 38336) with the 25 cm f/6.3 FRAM-CTA-N telescope located at Observatorio del Roque de los Muchachos, La Palma, Spain. Observations were conducted from 2024-11-28T06:05:22 to 2024-11-28T08:21:54, 1.0 day after the GW trigger time. We obtained a total of 23 images in the Johnson R band, acquiring 2 consecutive 2-minute long exposures at the individual pointings in the table below, for a total of 2760 seconds. The observation plan was constructed to cover 11.8 degrees of the bayestar.multiorder.fits,1 localization, corresponding to ~3.1% of the enclosed probability. The regions of highest localization probability were unfortunately unobservable because of constraints of proximity to the Sun. Our low latency analysis (Karpov et al. 2021) did not reveal any significant candidate down to the limits listed in the table below (5 sigma, Vega system): | Start time (UTC) | RA | DEC | Lim.Mag. | Exposure (seconds) | 2024-11-28T06:05:22.573 | 189.11392 | -31.62162 | 17.04 | 120 | 2024-11-28T06:07:34.140 | 189.11392 | -31.62162 | 17.03 | 120 | 2024-11-28T06:09:56.133 | 188.46395 | -30.64865 | 16.96 | 120 | 2024-11-28T06:12:07.703 | 188.46395 | -30.64865 | 17.02 | 120 | 2024-11-28T06:14:26.822 | 187.97468 | -31.62162 | 17.19 | 120 | 2024-11-28T06:16:38.420 | 187.97468 | -31.62162 | 17.13 | 120 | 2024-11-28T06:19:00.368 | 189.66443 | -36.48649 | 17.45 | 120 | 2024-11-28T06:21:11.958 | 189.66443 | -36.48649 | 17.46 | 120 | 2024-11-28T06:23:43.572 | 195.42857 | -73.45946 | 17.74 | 120 | 2024-11-28T06:25:55.193 | 195.42857 | -73.45946 | 17.76 | 120 | 2024-11-28T06:28:16.041 | 198.85714 | -73.45946 | 17.73 | 120 | 2024-11-28T06:30:27.649 | 198.85714 | -73.45946 | 17.73 | 120 | 2024-11-28T06:32:48.431 | 192 | -73.45946 | 17.76 | 120 | 2024-11-28T07:11:24.897 | 188.9441 | -29.67568 | 17.72 | 120 | 2024-11-28T07:13:36.499 | 188.9441 | -29.67568 | 17.65 | 120 | 2024-11-28T07:15:56.104 | 189.59248 | -30.64865 | 17.67 | 120 | 2024-11-28T07:18:07.696 | 189.59248 | -30.64865 | 17.53 | 120 | 2024-11-28T07:20:31.567 | 190.25316 | -31.62162 | 17.57 | 120 | 2024-11-28T07:22:43.183 | 190.25316 | -31.62162 | 17.53 | 120 | 2024-11-28T07:25:14.770 | 192 | -73.45946 | 17.64 | 120 | 2024-11-28T07:27:26.342 | 192 | -73.45946 | 17.65 | 120 | 2024-11-28T08:17:43.339 | 188.45638 | -36.48649 | 16.07 | 120 | 2024-11-28T08:19:54.951 | 188.45638 | -36.48649 | 15.87 | 120 All the data have been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2022), and calibrated using the Gaia DR3 SynPhot catalogue. The data are not corrected from Galaxy extinction. We use the SkyPortal application (skyportal.io) to monitor our observational campaign (Coughlin et al. 2023) 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). View this GCN Circular online at https://gcn.nasa.gov/circulars/38370. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36361] Fermi trigger No 754492985: Global MASTER-Net observations report
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38369 SUBJECT: Fermi trigger No 754492985: Global MASTER-Net observations report DATE: 24/11/28 19:01:02 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-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 GRB241128.56 (trigger No 754492985,20h 05m 12.00s , -50d 37m 01.2s, R=32.43) errorbox 18760 sec after notice time and 18796 sec after trigger time at 2024-11-28 18:36:17 UT, with upper limit up to 19.6 mag. Observations started at twilight. The observations began at zenith distance = 37 deg. The sun altitude is -13.3 deg. The galactic latitude b = -33 deg., longitude l = 348 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2687320 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 18886 | 2024-11-28 18:36:17 | MASTER-SAAO | (21h 51m 11.04s , -56d 55m 07.0s) | C | 180 | 19.3 | 19086 | 2024-11-28 18:39:36 | MASTER-SAAO | (21h 51m 14.31s , -56d 55m 53.2s) | C | 180 | 19.6 | 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/38369. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36360] GRB 241128A: Swift-XRT afterglow detection
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38368 SUBJECT: GRB 241128A: Swift-XRT afterglow detection DATE: 24/11/28 18:34:25 GMT FROM: K.L. Page at U Leicester <klp5(a)leicester.ac.uk> K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team: Immediately following the BAT trigger on GRB 241128A, Swift entered the South Atlantic Anomaly, during which time no XRT data were taken. The field of the GRB became visible to the XRT at 17:16 UT, 3.9 ks after the trigger, at which point the XRT afterglow of the burst was detected at a position of RA, Dec = 273.72454, 33.43853 which is equivalent to: RA (J2000): 18:14:53.89 Dec(J2000): +33:26:18.9 with an uncertainty of 3.5 arcsec (radius, 90% confidence). This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/38368. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36359] GRB 241128A: Swift detection of a burst
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38367 SUBJECT: GRB 241128A: Swift detection of a burst DATE: 24/11/28 16:37:44 GMT FROM: K.L. Page at U Leicester <klp5(a)leicester.ac.uk> R. Brivio (INAF-OAB), M. Ferro (INAF-OAB), C. Gronwall (PSU), R. Gupta (NASA GSFC), A. Y. Lien (U Tampa), K. L. Page (U Leicester), D. M. Palmer (LANL), C. Salvaggio (INAF-OAB) and T. Sbarrato (INAF-OAB) report on behalf of the Neil Gehrels Swift Observatory Team: At 16:14:34 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 241128A (trigger=1270999). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 273.724, +33.435 which is RA(J2000) = 18h 14m 54s Dec(J2000) = +33d 26' 07" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). Although a telemetry gap prevented the download of a BAT lightcurve, the trigger duration of 4 s indicates that this is a long burst. The XRT began observing the field at 16:16:32.2 UT, 118.0 seconds after the BAT trigger. No source was detected in the 2.5-s promptly available image. We are waiting for the full dataset to detect and localise the XRT counterpart. There are no prompt UVOT data available at this time. Although this source has not been confirmed during the short XRT observation (truncated by entrance into the SAA) or by the non-availability of the BAT lightcurve, the strength of peak (8.4 sigma) in the BAT image indicates that this is an astrophysical source. Burst Advocate for this burst is R. Brivio (riccardo.brivio AT inaf.it). 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/38367. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36358] GRB 241127A: GRANDMA and Kilonova-Catcher optical afterglow detections
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38366 SUBJECT: GRB 241127A: GRANDMA and Kilonova-Catcher optical afterglow detections DATE: 24/11/28 16:24:29 GMT FROM: Thomas Hussenot-Desenonges at IJCLab <thomas.hussenot(a)ijclab.in2p3.fr> T. Hussenot-Desenonges (IJCLAB), D. Akl (AUS), M. Coughlin (UMN), M. Molham (NRIAG), S. Agayeva (Shamakhy Obs.), S. Antier (OCA), C. Andrade (UMN), S. Karpov (FZU), I. Tosta e Melo (UniCT-DFA), P. Hello (IJCLAB), P-A Duverne (APC), T. Pradier (Unistra/IPHC), N. Guessoum (AUS), M. Masek (FZU), A. Klotz (IRAP), D. Turpin (CEA-Saclay/Irfu), M. Freeberg (KNC), on behalf of the GRANDMA and Kilonova-Catcher collaborations: We observed the field of GRB 241127A, detected by SWIFT (GCN 38354) and SVOM (GCN 38363) with the GRANDMA network and its citizen science project Kilonova-catcher (KNC). Our observations were performed with the TAROT-TCH, FRAM-Auger and the KNC-CHI-1, 60cm telescopes. We detect the afterglow already observed by Swift/XRT and UVOT (GCN 38354, 38362, 38364, 38365), MASTER (GCN 38353, 38358) and LCOGT (GCN 38359) and obtain the following magnitudes: | Tstart (UTC) | Telescope | Exposure | Filter | Magnitude | | 2024-11-28T00:33:05 | FRAM-Auger | 20x120s | R | 18.78 +- 0.20 (Vega)| | 2024-11-28T00:50:45 | TAROT-TCH | 4x180s | R | 19.14 +- 0.17 (Vega)| | 2024-11-28T01:16:26 | KNC-CHI-1 | 2x120s | r' | 19.4 +- 0.1 (AB) | | 2024-11-28T01:20:52 | KNC-CHI-1 | 2x120s | g' | 19.74 +- 0.09 (AB) | All the data have been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2022). TCH and KNC images were calibrated using the SkyMapper DR4 catalogue, the FRAM-Auger image used Gaia DR3 Synphot. The data are not corrected from Galaxy extinction. Our magnitudes are consistent with those reported by LCOGT in GCN 38359. We use the SkyPortal application (skyportal.io) to monitor our observational campaign (Coughlin et al. 2023) A report of the observations of GRANDMA for this source can be seen at: https://skyportal-icare.ijclab.in2p3.fr/public/sources/GRB241127 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/38366. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36357] GRB 241127A: Swift/UVOT Detection
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38365 SUBJECT: GRB 241127A: Swift/UVOT Detection DATE: 24/11/28 13:21:45 GMT FROM: Alice Breeveld at MSSL-UCL <a.breeveld(a)ucl.ac.uk> A. A. Breeveld (UCL-MSSL) and C. Salvaggio (INAF-OAB) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 241127A 484 s after the BAT trigger (Salvaggio et al., GCN Circ. 38354). The optical counterpart seen in the UVOT at the position given in that circular, and also reported by Ortega-Cass et al., (GCN Circ. 38359) and MASTER (Buckley et al., GCN circular 38352 and Francile et al., GCN circular 38358) is detected in all the filters used for the initial UVOT exposures and is fading. Preliminary magnitudes using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white 484 634 147 17.04 ± 0.03 white 16459 16862 393 19.81 +/1 0.09 b 15547 16453 885 20.3 ± 0.3 u 21787 22629 821 19.1 ± 0.1 v 10002 10870 847 19.7 ± 0.2 uvw1 20881 21780 886 19.5 ± 0.3 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.034 in the direction of the burst (Schlegel et al. 1998). View this GCN Circular online at https://gcn.nasa.gov/circulars/38365. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36356] GRB 241127A: Swift-XRT refined Analysis
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38364 SUBJECT: GRB 241127A: Swift-XRT refined Analysis DATE: 24/11/28 11:07:18 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> A. Melandri (INAF-OAR), S. Dichiara (PSU), J.A. Kennea (PSU), D.N. Burrows (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB) and P.A. Evans report on behalf of the Swift-XRT team: We have analysed 5.0 ks of XRT data for GRB 241127A, from 443 s to 27.9 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=0.66 (+0.05, -0.06). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.97 (+0.18, -0.17). The best-fitting absorption column is 8.0 (+4.5, -3.9) x 10^20 cm^-2, in excess of the Galactic value of 2.7 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 3.4 x 10^-11 (4.0 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 8.0 (+4.5, -3.9) x 10^20 cm^-2 Galactic foreground: 2.7 x 10^20 cm^-2 Excess significance: 2.2 sigma Photon index: 1.97 (+0.18, -0.17) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01270788. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/38364. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36355] GRB 241127A: SVOM/GRM observation
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38363 SUBJECT: GRB 241127A: SVOM/GRM observation DATE: 24/11/28 09:08:34 GMT FROM: zhengchao_astro(a)foxmail.com SVOM/GRM team: Chao Zheng, Chen-Wei Wang, Shi-Jie Zheng, Yong-Wei Dong, Jiang-Tao Liu, Jian-Chao Sun, Yue Huang, Jiang He, Min Gao, Hao-Xuan Guo, Lu Li, Yong-Ye Li, Hong-Wei Liu, Xin Liu, Hao-Li Shi, Li-Ming Song, You-Li Tuo, Wen-Long Zhang, Wen-Jun Tan, Hao-Xi Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Rui-Jie Wang, Yu-Xi Wang, Bo-Bing Wu, Shao-Lin Xiong, Jian-Ying Ye, Yi-Tao Yin, Wen-Hui Yu, Fan Zhang, Li Zhang, Peng Zhang, Shuang-Nan Zhang, Yan-Qiu Zhang, Yan-Ting Zhang, Shu-Min Zhao, Xiao-Yun Zhao (IHEP), Maria-Grazia Bernardini (LUPM/INAF-OAB), Laurent Bouchet (IRAP), David Corre (CEA), Tais Maiolino (LUPM), Frédéric Piron (LUPM), Stéphane Schanne (CEA), Jingwei Wang (IAP), JeanLuc Attéia (IRAP) 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: During the commissioning phase, SVOM/GRM detected GRB 241127A at 2024-11-27T21:43:16.230 UT (T0), which was also observed by Swift/BAT (C. Salvaggio, et al., GCN 38354). With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of a single pulse with a duration of about 3 s. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb241127A.png This burst is located at about 75.6 degrees from the SVOM optical axis. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), the 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. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM/GRM point of contact for this burst is: Chao Zheng (IHEP)(zhengchao97(a)ihep.ac.cn) View this GCN Circular online at https://gcn.nasa.gov/circulars/38363. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36354] GRB 241127A: Enhanced Swift-XRT position
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38362 SUBJECT: GRB 241127A: Enhanced Swift-XRT position DATE: 24/11/28 07:55:25 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team. Using 2379 s of XRT Photon Counting mode data and 9 UVOT images for GRB 241127A, 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 = 327.88543, -56.66544 which is equivalent to: RA (J2000): 21h 51m 32.50s Dec (J2000): -56d 39' 55.6" with an uncertainty of 2.1 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/38362. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36353] LIGO/Virgo/KAGRA S241127aj: Updated Sky localization
by GCN Circulars 28 Nov '24

28 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38361 SUBJECT: LIGO/Virgo/KAGRA S241127aj: Updated Sky localization DATE: 24/11/28 05:18:19 GMT FROM: ethan.payne(a)ligo.org The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further offline analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S241127aj (GCN Circular 38336). 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/S241127aj For the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 105 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1100 +/- 99 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/38361. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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