January 2025 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 37007] ATCA detection of possible radio counterpart to GRB 250114A
by GCN Circulars 20 Jan '25

20 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38999 SUBJECT: ATCA detection of possible radio counterpart to GRB 250114A DATE: 25/01/20 14:14:16 GMT FROM: lauren.rhodes(a)mcgill.ca L. Rhodes (TSI/McGill), G. E. Anderson (Curtin), A. J. van der Horst (GWU), J. K. Leung (UofT/HUJI), A. Gulati (USyd), S. Chastain (UNM) on behalf of the PanRadio GRB collaboration We observed the position of GRB 250114A (Klingler et al., GCN 38927) starting at 2025-01-16 15:53UT for 7.5 hours with the Australia Telescope Compact Array (ATCA), as part of the “PanRadio GRB” Large ATCA follow-up programme C3542 (PI. Anderson). We detect a radio source at the reported position (Klingler et al., GCN 38927) of the afterglow with a preliminary flux density of 70uJy/beam. The rms noise in our observation is 13 uJy/beam at 7GHz. We thank the CSIRO Space and Astronomy staff for supporting these observations. We acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO. View this GCN Circular online at https://gcn.nasa.gov/circulars/38999. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37006] EP250108a / SN2025kg: Non-detection from ATCA radio follow-up observations
by GCN Circulars 20 Jan '25

20 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38998 SUBJECT: EP250108a / SN2025kg: Non-detection from ATCA radio follow-up observations DATE: 25/01/20 11:59:13 GMT FROM: Tao An at SHAO, CAS <antao(a)shao.ac.cn> Tao An, Yuanqi Liu (SHAO), Jinjun Geng, Xuefeng Wu (PMO) and Francesco Carotenuto (INAF/OAR) report on behalf of the Einstein Probe radio follow-up team. EP250108a / SN2025kg was initially discovered and reported by the EP team (Li et al., GCN 38861), followed by the optical conterpart AT2025kg identified (“the kangaroo”; Eyles-Ferris, GCN 38878; Zhu et al., GCN 38885; Malesani et al., GCN 38902; Kumar et al., GCN 38907; Zhu et al, GCN 38908; Levan et al., GCN 38909; Izzo, GCN 38912; Zou et al., GCN 38914; Moskvitin & Spiridonova, GCN 38925; Song et al., GCN 38972; Eyles-Ferris et al., GCN 38983; Xu et al., GCN 38984, Levan et al., GCN 38987). In the images produced using natural weighting, no significant emission was detected at 5.5 GHz or 9 GHz, with 3σ upper limits of 24 μJy and 18 μJy, respectively. After combining the data from both spectral windows, no signal was detected, resulting in a lower 3σ upper limit of 15 μJy at a central frequency of 7.25 GHz. We thank the ATCA team for their rapid scheduling and excellent support. View this GCN Circular online at https://gcn.nasa.gov/circulars/38998. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37005] GRB 250119B: INTEGRAL/SPI-ACS detection
by GCN Circulars 20 Jan '25

20 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38997 SUBJECT: GRB 250119B: INTEGRAL/SPI-ACS detection DATE: 25/01/20 11:35:31 GMT FROM: Aishwarya L Thakur at INAF-IAPS, Rome <aishth(a)outlook.com> Patrizia Barria(a,b), Giulia Gianfagna(a), James Craig Rodi(a), Aishwarya Linesh Thakur(a), Luigi Piro(a), Lorenzo Natalucci(a,b) report: GRB 250119B was discovered by Fermi/GBM (GCN 38979, 38980) at time 2025-01-16T08:27:01 (UTC). We searched for any corresponding counterpart in the INTEGRAL/SPI-ACS data. In a SPI-ACS light curve above 80 keV we find a signal temporally coincident with the GBM detection having an approximate duration of ~ 60 sec.The signal consists of several pulses over this duration. The approximate peak count rate in SPI-ACS is 90,000 cts/s for E>80 keV, over a median background rate of 65,400 cts/s. This work is based on observations with INTEGRAL, an ESA project with instruments and a science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, and Spain), and with the participation of Russia and the USA. The SPI-ACS detector system has been provided by MPE Garching/Germany. ----- (a) INAF/IAPS-Rome (b) ICSC National Research Centre for High-Performance Computing View this GCN Circular online at https://gcn.nasa.gov/circulars/38997. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37004] LIGO/Virgo/KAGRA S250119cv: GLADEnet Completeness: Potential Host Galaxies in the 90% Credible Volume
by GCN Circulars 20 Jan '25

20 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38996 SUBJECT: LIGO/Virgo/KAGRA S250119cv: GLADEnet Completeness: Potential Host Galaxies in the 90% Credible Volume DATE: 25/01/20 10:28:32 GMT FROM: Maria Lisa Brozzetti at Università degli Studi di Perugia <marialisa.brozzetti(a)ligo.org> M. L. Brozzetti (UniPG/INFN), G. Dálya (L2IT/EotvosU), G. Greco (INFN), M. Bawaj (UniPG/INFN), T. Matcovich (UniPG/INFN), S. Cutini (INFN) , R. De Pietri (UniPR/INFN), Marica Branchesi (GSSI) On behalf of the GLADEnet Team. We analyzed the completeness of the GLADE+ [1] catalog within the 90% credible localization volume of the S250119cv event from the 4-Update alert from the GCN Circular 38986. The completeness value is 5.0e-1 in the B-band using the last released skymap : Bilby.multiorder.fits,0, which means that the catalogue contains 50% of the total light in the B-band expected from galaxies in the localization volume. A total of 1469 galaxies are identified within the 90% gravitational volume. The complete list of galaxies can be downloaded from the GLADEnet webpage [2] : https://virgo.pg.infn.it/gladenet/catalogs/ GLADEnet allows for the interactive visualization of the 90% localization area and its intersection with regions of high extinction as defined in GLADE+. Furthermore, the first 1000 galaxies can be explored interactively, enabling users to filter galaxies based on their 3D probability density or their absolute B magnitude. The ligo.skymap cross-match method [3,4] is used to obtain the list of galaxies. References: [1]GLADE+: An Extended Galaxy Catalogue for Multimessenger Searches with Advanced Gravitational-wave Detectors G. Dálya et al. MNRAS, 514,1, pp.1403-1411, 2022 [2] GLADEnet: A progressive web app for multi-messenger cosmology and electromagnetic follow-ups of gravitational-wave sources M. L. Brozzetti, G. Dálya, G. Greco, M. Bawaj, T. Matcovich, M. Branchesi, T. Boch, M. Baumann, S. Cutini, R. De Pietri et al. (4 more) A&A, 684, A44 (2024) [3] Singer, L. P., Chen, H.-Y., Holz, D. E., et al. 2016, Astropys. J. Lett., 829, L15. doi:10.3847/2041-8205/829/1/L15 [4] Singer, L. P., Chen, H.-Y., Holz, D. E., et al. 2016, Astropys. J. Supp., 226, 10. doi:10.3847/0067-0049/226/1/10 View this GCN Circular online at https://gcn.nasa.gov/circulars/38996. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37003] EP 250108A: Late-time optical observation by LCO
by GCN Circulars 20 Jan '25

20 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38995 SUBJECT: EP 250108A: Late-time optical observation by LCO DATE: 25/01/20 06:12:24 GMT FROM: ankur ghosh at CAPP, University of Johannesburg <ghosh.ankur1994(a)gmail.com> Ankur Ghosh, Soebur Razzaque (CAPP, University of Johannesburg), Rahul Gupta (NASA GSFC), Alexander Moskvitin, Yulia Sotnikova (SAO RAS), Naveen Dukiya (ARIES) on behalf of a larger collaboration. We observed the field of the EP 250108A triggered by Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) (Li et al., GCN 38861) in V filter of the 1-meter Sinistro telescope at the Las Cumbres Observatory Global Telescope (LCOGT) node located at South African Astronomical Observatory (SAAO). The 1-m Sinistro telescope is equipped with a 4K x 4K CCD (FOV: 26 x 26 arcmin, scale: 0.39 arcsec/pixel). Observations began on January 19, 2025, starting 11.4 days after the GRB trigger. We clearly detect the optical transient (OT) reported by GCNs ( Zhu et al., GCN 38885; Malesani et al., GCN 38902; Kumar et al., GCN 38907; Zhu et al, GCN 38908; Levan et al., GCN 38909; Izzo, GCN 38912; Zou et al., GCN 38914; Moskvitin & Spiridonova, GCN 38925; Song et al., GCN 38972, Eyles-Ferris et al., GCN 38983) in our V, r band image. There is a confirmation of the Ic-BL supernova connection with EP 250108A (Xu et al., GCN 38984, Levan et al., GCN 38987). Observations are still ongoing in other filters. |Date| |UTstart| |t-T0 (days)| |Exp (sec)| |Filter| |Magnitude| 2025-01-19 21:59:26.59 11.4 1 x 1200 V V = 20.37 +/- 0.04 The field was calibrated against nearby APASS stars, with magnitudes converted using Lupton (2005) equations, and has not been corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/38995. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37002] GRB 250117A: SVOM/GRM observation of a short burst
by GCN Circulars 20 Jan '25

20 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38994 SUBJECT: GRB 250117A: SVOM/GRM observation of a short burst DATE: 25/01/20 04:00:03 GMT FROM: Chenwei Wang at IHEP <cwwang(a)ihep.ac.cn> SVOM/GRM team: Chen-Wei Wang, Yue Huang, Shi-Jie Zheng, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) report on behalf of the SVOM team: During the commissioning phase, SVOM/GRM was triggered in-flight by a short burst GRB 250117A (SVOM trigger reference: sb25011705) at 2025-01-17T20:21:58.300 UTC (T0), which was also detected by GECAM (GCN #38982), Swift/BAT (GCN #38988), Fermi/GBM, Konus-Wind and INTEGRAL/SPI-ACS. With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of multi-pulses with a T90 of 0.91 +0.43/-0.28 s. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb250117A.png 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. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM/GRM point of contact for this burst is: Chen-Wei Wang (IHEP) (cwwang(a)ihep.ac.cn) View this GCN Circular online at https://gcn.nasa.gov/circulars/38994. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37001] LIGO/Virgo/KAGRA S250105bn: 1 counterpart neutrino candidate event from an IceCube neutrino search
by GCN Circulars 20 Jan '25

20 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38993 SUBJECT: LIGO/Virgo/KAGRA S250105bn: 1 counterpart neutrino candidate event from an IceCube neutrino search DATE: 25/01/20 02:12:05 GMT FROM: Zsuzsa Marka at IceCube/Columbia University <zsuzsa(a)astro.columbia.edu> IceCube Collaboration (http://icecube.wisc.edu/) reports: We have performed a search for track-like muon neutrino candidate events detected by IceCube consistent with the sky localization of the low-significance gravitational-wave candidate event S250105bn in a time range of 1000 seconds centered on the alert event time (2025-01-05 08:07:30 UTC to 2025-01-05 08:24:10 UTC) [1,2]. During this time period, IceCube was collecting good quality data. The results are released with a delay due to software misconfiguration. A single hypothesis test was conducted using a Bayesian approach to quantify the joint GW + neutrino event significance, which assumes a binary merger scenario and accounts for known astrophysical priors, such as GW source distance, in the statistical significance estimation [3]. One track-like event was found in spatial and temporal coincidence with the gravitational-wave candidate S250105bn calculated from the map circulated in the S250105bn-2-Preliminary notice. This represents an overall p-value of 0.0051 for the Bayesian search. The p-value measures the consistency of the observed track-like event with the known atmospheric backgrounds for this single map (not accounting for statistical trials from multiple GW events). Further details are available at https://gcn.nasa.gov/missions/icecube and at https://roc.icecube.wisc.edu/public/LvkNuTrackSearch. Properties of the coincident event are shown below: dt(s) RA(deg) Dec(deg) Angular uncertainty(deg) p-value(Bayesian) ------------------------------------------------------------------------------------- 107.15 352.11 -16.39 4.87 0.0051 where: dt = Time of track event minus time of GW trigger (sec) Angular uncertainty = Angular uncertainty of track event: the radius of a circle representing 90% CL containment by area. p-value = the p-value for this specific track event from this search. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc(a)icecube.wisc.edu [1] M. G. Aartsen et al 2020 ApJL 898 L10 [2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80 [3] I. Bartos et al. 2019 Phys. Rev. D 100, 083017 View this GCN Circular online at https://gcn.nasa.gov/circulars/38993. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37000] LIGO/Virgo/KAGRA S250119cv: Updated NED Galaxies in the Localization Volume
by GCN Circulars 20 Jan '25

20 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38992 SUBJECT: LIGO/Virgo/KAGRA S250119cv: Updated NED Galaxies in the Localization Volume DATE: 25/01/20 00:54:50 GMT FROM: David Cook at Caltech/IPAC-NED <dcook(a)ipac.caltech.edu> David O. Cook (Caltech/IPAC), Rick Ebert (Caltech/IPAC), George Helou (Caltech/IPAC), Joseph M. Mazzarella (Caltech/IPAC), Marion Schmitz (Caltech/IPAC), and Leo Singer (NASA/GSFC) On behalf of the NASA/IPAC Extragalactic Database (NED) Team. We spatially cross-matched the LVK S250119cv-4-Update sky localization with the NED Local Volume Sample (NED-LVS; Cook et al. 2023), which is a subset of NED with a redshift or redshift-independent distance less than 1000 Mpc. We find 264 galaxies within the 90% containment volume, and we list here the top 20 galaxies sorted by the joint probability of the 3D localization and the WISE W1 luminosity (an observable proxy for stellar mass). For the full or top 20 list of galaxies in the 90% volume go either to the NED Gravitational Wave Followup service at https://ned.ipac.caltech.edu/uri/NED::GWF/ or click on the following links: Full List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250119cv/4 Top 20 List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250119cv/4/20 The NED-GWF service provides downloadable galaxy lists and visualizations for candidate host galaxies. For each GW alert, these products are automatically generated and made available within minutes to expedite efficient electromagnetic follow-up observations. The NED top 20 list is sorted by the joint probability of the 3D localization and the WISE W1 luminosity, but users can sort on additional pre-computed prioritization metrics (star formation rate, P_3D * P_SFR; and specific star formation rate, P_3D * P_sSFR; etc.) which are available via downloading the entire galaxy list inside the event's probability volume. | objname| ra| dec|objtype| DistMpc|DistMpc_unc| m_NUV| m_NUV_unc| m_Ks| m_Ks_unc| m_W1| m_W1_unc| P_3D|P_3D_LumW1| |-------------------------|--------------|--------------|-------|-----------|-----------|------------|------------|------------|------------|------------|------------|--------|----------| |WISEA J010052.08+272244.7| 15.21700| 27.37903| G| 412.82| null| null| null| 13.063| 0.160| 9.482| 0.006|3.08e-06| 3.18e-07| |WISEA J005607.30+262638.7| 14.03046| 26.44408| G| 494.35| 0.08| null| null| 13.516| 0.147| 13.060| 0.028|1.14e-05| 6.25e-08| |WISEA J005556.23+263010.8| 13.98417| 26.50308| G| 489.28| 0.48| null| null| 13.560| 0.174| 13.311| 0.020|1.27e-05| 5.40e-08| |WISEA J005948.86+263351.3| 14.95367| 26.56428| G| 407.84| null| 20.155| 0.094| 13.132| 0.139| 12.600| 0.011|8.56e-06| 4.88e-08| | UGC 00535| 13.13108| 26.13222| G| 220.59| 0.09| null| null| 11.661| 0.089| 10.301| 0.006|3.48e-06| 4.81e-08| |WISEA J005802.01+274134.0| 14.50842| 27.69286| G| 528.34| null| 21.078| 0.347| 13.493| 0.155| 13.513| 0.018|1.04e-05| 4.28e-08| |WISEA J005607.67+254804.7| 14.03167| 25.80111| G| 471.60| null| 18.108| 0.052| 13.402| 0.132| 12.514| 0.023|5.09e-06| 4.19e-08| |WISEA J005801.84+270201.6| 14.50800| 27.03431| G| 484.58| null| 20.807| 0.258| 13.712| 0.172| 14.040| 0.048|1.93e-05| 4.13e-08| |WISEA J005219.16+261631.6| 13.07933| 26.27567| G| 282.70| null| null| null| 12.640| 0.082| 11.628| 0.007|5.94e-06| 3.97e-08| |WISEA J005612.58+255012.0| 14.05271| 25.83672| G| 584.23| null| null| null| 12.708| 0.120| 12.073| 0.010|2.07e-06| 3.93e-08| |WISEA J005622.27+262812.4| 14.09271| 26.46994| G| 358.94| 0.73| 19.715| 0.146| 13.693| 0.180| 12.830| 0.010|1.07e-05| 3.83e-08| |WISEA J005734.00+265543.4| 14.39158| 26.92878| G| 310.80| null| null| null| 13.442| 0.147| 11.227| 0.007|3.25e-06| 3.81e-08| |WISEA J005737.99+263814.8| 14.40834| 26.63756| G| 636.80| 0.29| null| null| 13.166| 0.116| 12.752| 0.017|3.08e-06| 3.71e-08| |WISEA J005522.22+273458.8| 13.84267| 27.58306| G| 546.38| 0.09| 20.390| 0.291| 13.821| 0.188| 13.423| 0.017|7.75e-06| 3.71e-08| |WISEA J005359.99+271503.0| 13.50000| 27.25086| G| 411.22| 0.10| null| null| 13.288| 0.141| 13.011| 0.017|8.86e-06| 3.51e-08| |WISEA J005611.18+272126.2| 14.04667| 27.35733| G| 420.81| null| null| null| 13.468| 0.140| 13.351| 0.024|1.08e-05| 3.29e-08| |WISEA J005530.30+274200.2| 13.87629| 27.70008| IrS| 545.80| 0.03| null| null| 13.778| 0.164| 13.553| 0.025|7.59e-06| 3.22e-08| |WISEA J005201.48+261645.2| 13.00621| 26.27922| IrS| 390.49| null| null| null| 12.838| 0.104| 12.605| 0.012|6.04e-06| 3.13e-08| |WISEA J005817.42+254530.5| 14.57217| 25.75844| G| 369.84| 0.10| null| null| 13.157| 0.130| 12.920| 0.012|7.85e-06| 2.74e-08| |WISEA J005413.03+271750.3| 13.55433| 27.29731| G| 444.44| null| null| null| 13.625| 0.156| 13.660| 0.025|1.03e-05| 2.63e-08| Table 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S250119cv sorted by the joint probability of 3D position and WISE W1 luminosity (P_3D * P_LumW1). Galaxy is the NED preferred name. RA and Dec are the Equatorial coordinates in degrees (J2000). Objtype is the object type of the galaxy candidate. Distance is the distance to the galaxy in Mpc. m_NUV and mErr_NUV are the apparent magnitude and error from GALEX. m_Ks and mErr_Ks are the apparent magnitude and error from 2MASS. m_W1 and mErr_W1 are the apparent magnitude and error from AllWISE. P_3D is the probability that the galaxy is in the volume given the distance of GW event. P_3D_LumW1 is the joint probability within the volume weighted by the WISE1 luminosity of the galaxy (P_3D * P_LumW1). View this GCN Circular online at https://gcn.nasa.gov/circulars/38992. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36999] LIGO/Virgo/KAGRA S250119cv: Updated Sky localization and EM Bright Classification
by GCN Circulars 20 Jan '25

20 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38991 SUBJECT: LIGO/Virgo/KAGRA S250119cv: Updated Sky localization and EM Bright Classification DATE: 25/01/20 00:39:00 GMT FROM: Soichiro Morisaki at U. of Tokyo <soichiro.morisaki(a)ligo.org> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further 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 S250119cv (GCN Circular 38986). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S250119cv Based on posterior support from parameter estimation [1], under the assumption that the candidate S250119cv is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%. For the Bilby.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 9 deg2 described by the following DS9 region (right ascension, declination, semi-major axis, semi-minor axis, position angle of the semi-minor axis): icrs; ellipse(00h56m, +26d48m, 1.84d, 1.56d, 72.16d) Marginalized over the whole sky, the a posteriori luminosity distance estimate is 472 +/- 112 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. (2023) arXiv:2307.13380 [2] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe View this GCN Circular online at https://gcn.nasa.gov/circulars/38991. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36998] GRB 250119C: Fermi GBM Final Real-time Localization
by GCN Circulars 19 Jan '25

19 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38990 SUBJECT: GRB 250119C: Fermi GBM Final Real-time Localization DATE: 25/01/19 22:52:34 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 SHORT GRB At 22:41:06 UT on 19 Jan 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250119C (trigger 759019271.302184 / 250119945). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 163.9, Dec = 15.1 (J2000 degrees, equivalent to J2000 10h 55m, 15d 05'), with a statistical uncertainty of 8.8 degrees. The angle from the Fermi LAT boresight is 66.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119945/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119945/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119945/… View this GCN Circular online at https://gcn.nasa.gov/circulars/38990. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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