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

[vsnet-grb-info 37928] GRB 250328A: SVOM detection of a burst
by GCN Circulars 28 Mar '25

28 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39910 SUBJECT: GRB 250328A: SVOM detection of a burst DATE: 25/03/28 17:32:16 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> M. Brunet, J. Malzac, L. Bouchet, O. Godet (IRAP), C. Plasse (CEA), L.P. Xin (NAOC) on behalf of the SVOM mission team. SVOM/ECLAIRs triggered on the gamma-ray burst GRB 250328A (SVOM burst-id sb25032803) starting at 2025-03-28T16:56:56.3 UTC (Tb). The following trigger information was received on the ground with low latency by … [View More]

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[vsnet-grb-info 37927] FRB 20250316A: FTW optical observations
by GCN Circulars 28 Mar '25

28 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39909 SUBJECT: FRB 20250316A: FTW optical observations DATE: 25/03/28 16:50:28 GMT FROM: Malte Busmann at Ludwig-Maximilians-Universität München <m.busmann(a)physik.lmu.de> Malte Busmann, Jennifer Fabà, Daniel Gruen, Mathias Mucke, Xiaoxiong Zuo (LMU), Brendan O'Connor, and Antonella Palmese (CMU) report on behalf of a larger collaboration: We observed the localization of FRB 20250316A (Ng et al., ATel #17081; Andrew et al., GCN 39886). With the … [View More]Three Channel Imager (3KK) at the Fraunhofer Telescope at Wendelstein Observatory (FTW) in the g and i band on multiple nights. Observations started 2.53d after the FRB or 5.8h after the discovery of an uncataloged X-ray source EP J120944.2+585060 by Einstein Probe (GCN 39834). | Time (UT) | t - t0 (d) | Band | Exposures | Depth (3 sigma, AB mag) | Depth Diff (3 sigma, AB mag) | |---------------------|------------|------|-----------|-------------------------|------------------------------| | 2025-03-18T21:14:03 | 2.53 | g | 10x 180 s | 24.3 | Used as Reference | | 2025-03-18T21:14:03 | 2.53 | i | 10x 180 s | 23.7 | Used as Reference | | 2025-03-22T20:05:28 | 6.48 | g | 16x 180 s | 21.9 | - | | 2025-03-22T20:05:28 | 6.48 | i | 16x 180 s | 21.6 | - | | 2025-03-23T23:11:05 | 7.61 | g | 15x 180 s | 24.4 | 23.5 | | 2025-03-23T23:11:05 | 7.61 | i | 15x 180 s | 23.8 | 23.0 | | 2025-03-28T03:33:48 | 11.79 | g | 10x 180 s | 23.0 | 22.9 | | 2025-03-28T03:33:48 | 11.79 | i | 10x 180 s | 22.5 | 22.5 | We performed difference imaging against templates from the LegacySurvey (g) and PS1 (i). We also used our first observation as a template and do not detect any excess flux at the FRB location in either case. This is consistent with the observations of Becerra et al. (ATel #17082, GCN 39843, 39853), Niino et al.(ATel #17084), Hashimoto (ATel #17095), Yang et al. (ATel #17101), Troja et al. (ATel #17109, GCN 39869), Dong et al. (ATel #17112), Aryan et al. (GCN 39839), Pereyra et al. (GCN 39858), Jiang et al. (GCN 39864), Gillanders et al. (GCN 39883), and Simha et al. (ATel #17116, GCN 39887). The magnitudes are calibrated against the PS1 catalog and are not corrected for galactic extinction. We thank Christoph Ries and Michael Schmidt from the Wendelstein Observatory staff for obtaining these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/39909. --- 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 37926] LIGO/Virgo/KAGRA S250328ae: NED Galaxies in the 4-Update Localization Volume
by GCN Circulars 28 Mar '25

28 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39908 SUBJECT: LIGO/Virgo/KAGRA S250328ae: NED Galaxies in the 4-Update Localization Volume DATE: 25/03/28 15:33:03 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 … [View More]the LVK S250328ae-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 839 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/S250328ae/4 Top 20 List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250328ae/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 J094227.03+110047.4| 145.61266| 11.01318| G| 612.35| null| null| null| 12.661| 0.096| 10.577| 0.006|2.63e-06| 5.47e-08| |WISEA J093435.61+082700.3| 143.64838| 8.45010| G| 507.10| 0.11| null| null| 13.186| 0.203| 10.854| 0.006|3.85e-06| 4.28e-08| |WISEA J093458.83+094902.6| 143.74516| 9.81741| G| 564.56| 0.09| null| null| 14.250| 0.157| 10.944| 0.007|2.12e-06| 2.69e-08| |WISEA J093555.60+093752.8| 143.98169| 9.63134| G| 589.67| 0.08| null| null| 13.465| 0.202| 11.501| 0.007|2.87e-06| 2.37e-08| |WISEA J093938.05+110947.9| 144.90857| 11.16332| G| 482.07| 0.08| null| null| 13.597| 0.141| 12.972| 0.014|1.58e-05| 2.25e-08| |WISEA J094028.13+111733.4| 145.11722| 11.29263| G| 556.24| 0.11| null| null| 13.110| 0.111| 12.941| 0.015|9.93e-06| 1.94e-08| |WISEA J094035.77+103104.6| 145.14905| 10.51795| G| 495.66| 0.07| null| null| 13.045| 0.080| 12.298| 0.012|6.77e-06| 1.90e-08| |WISEA J093657.39+085125.0| 144.23916| 8.85696| G| 557.28| 0.06| null| null| null| null| 11.769| 0.007|3.22e-06| 1.86e-08| |WISEA J094109.87+105038.6| 145.29116| 10.84407| G| 439.67| 0.07| null| null| 12.109| 0.080| 12.120| 0.012|6.55e-06| 1.70e-08| |WISEA J094121.23+112617.1| 145.33849| 11.43811| G| 564.36| 0.09| null| null| 13.311| 0.123| 13.095| 0.017|9.76e-06| 1.70e-08| |WISEA J094025.05+111347.9| 145.10441| 11.23000| G| 557.91| 0.09| null| null| 13.243| 0.108| 13.078| 0.020|9.62e-06| 1.66e-08| |WISEA J093619.16+091944.6| 144.07983| 9.32906| G| 588.58| 0.11| null| null| 13.919| 0.167| 12.015| 0.007|3.16e-06| 1.62e-08| |WISEA J093619.13+091936.4| 144.07971| 9.32680| G| 591.85| 0.08| null| null| 12.365| 0.106| 12.060| 0.010|3.00e-06| 1.49e-08| |WISEA J093747.49+101024.7| 144.44789| 10.17354| G| 432.26| 0.05| null| null| 12.881| 0.108| 12.438| 0.013|7.81e-06| 1.46e-08| |WISEA J093417.20+081006.5| 143.57167| 8.16848| G| 347.36| 0.08| 21.156| 0.071| 13.681| 0.191| 10.002| 0.006|1.22e-06| 1.39e-08| |WISEA J094125.76+110548.3| 145.35737| 11.09678| G| 557.02| 0.07| null| null| 13.696| 0.126| 13.350| 0.021|9.58e-06| 1.28e-08| |WISEA J094051.38+102028.4| 145.21409| 10.34125| G| 444.19| 0.03| null| null| 15.275| 0.145| 12.091| 0.007|4.61e-06| 1.25e-08| |WISEA J094106.66+105024.2| 145.27777| 10.84008| G| 487.71| null| null| null| 14.219| 0.109| 13.198| 0.021|1.00e-05| 1.18e-08| |WISEA J093537.73+091115.6| 143.90721| 9.18768| G| 552.71| 0.11| null| null| 13.648| 0.222| 12.528| 0.013|4.10e-06| 1.16e-08| |WISEA J093620.06+092335.0| 144.08362| 9.39307| G| 582.84| 0.07| 20.401| 0.231| 13.508| 0.189| 12.534| 0.014|3.60e-06| 1.12e-08| Table 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S250328ae 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/39908. --- 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 37925] EP250302a: upper limit of SPI-ACS/INTEGRAL
by GCN Circulars 28 Mar '25

28 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39907 SUBJECT: EP250302a: upper limit of SPI-ACS/INTEGRAL DATE: 25/03/28 13:40:48 GMT FROM: Alexei Pozanenko at IKI, Moscow <grb.alex(a)gmail.com> P. Minaev (IKI), A. Pozanenko (IKI), S. Grebenev (IKI), I. Chelovekov (IKI) and IKI GRB-FuN We searched the INTEGRAL dataset for gamma-ray emission from the X-ray transient EP250302a, detected with WXT EP (Dai et al., GCN 39556). No significant excess above the background was detected during the EP250302a … [View More]

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[vsnet-grb-info 37924] GRB 250327B: CrAO and SAO RAS Optical Observations
by GCN Circulars 28 Mar '25

28 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39906 SUBJECT: GRB 250327B: CrAO and SAO RAS Optical Observations DATE: 25/03/28 13:37:10 GMT FROM: Alexei Pozanenko at IKI, Moscow <grb.alex(a)gmail.com> N. Pankov (HSE, IKI), A. Moskvitin (SAO RAS), V. Rumyantsev (CrAO), O. I. Spiridonova (SAO RAS), A. Pozanenko (IKI) report on behalf of IKI-GRB-FuN: We performed optical observations of the field of GRB 250327A (Bouchet et. al, GCN 39888; Page et. al, GCN 39895) at the redshift of z = 3.035 (… [View More]

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[vsnet-grb-info 37923] GRB 250327B: OHP/T193 spectroscopic observations and redshift confirmation
by GCN Circulars 28 Mar '25

28 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39905 SUBJECT: GRB 250327B: OHP/T193 spectroscopic observations and redshift confirmation DATE: 25/03/28 12:49:52 GMT FROM: Benjamin Schneider at MIT <bschn(a)mit.edu> M. Dennefeld (IAP/CNRS/Sorbonne U.), B. Schneider (LAM), C. Adami (LAM/Pytheas/AMU), E. Le Floc'h (CEA/Irfu), A. Saccardi (CEA/Irfu), S. Vergani (CNRS, Obs. de Paris, LUX), S. Basa (Pytheas/OHP/LAM) report on behalf of the MISTRAL-GRB collaboration: We observed the SVOM/ECLAIRs GRB … [View More]

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[vsnet-grb-info 37922] GRB 250327B: further optical observations by LCOGT
by GCN Circulars 28 Mar '25

28 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39904 SUBJECT: GRB 250327B: further optical observations by LCOGT DATE: 25/03/28 12:22:25 GMT FROM: Amit Kumar at Royal Holloway - UoL/ U of Warwick, UK <amitkundu515(a)gmail.com> Amit Kumar (RHUL/Warwick), Raya Dastidar (UNAB), Giuliano Pignata (UTA), Danny Steeghs, Thomas Killestein (Warwick), David O’Neill (Birmingham), Jonathan Andrés Pineda García (UNAB) and Mauricio Ramirez (UNAB) report on behalf of the wider collaboration: We conducted … [View More]

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[vsnet-grb-info 37921] EP250315a: Pan-STARRS r and i-band imaging and photometry
by GCN Circulars 28 Mar '25

28 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39903 SUBJECT: EP250315a: Pan-STARRS r and i-band imaging and photometry DATE: 25/03/28 10:04:31 GMT FROM: James Gillanders at University of Oxford <jhgillanders.astro(a)gmail.com> J. H. Gillanders (Oxford), M. Huber, K. C. Chambers (IfA, Univ. Hawaii), S. J. Smartt, K. W. Smith, S. Srivastav (Oxford), M. Nicholl, D. Young, M. Fulton (QUB), T.-W. Chen (NCU, Taiwan) A. S. B. Schultz, T. de Boer, J. Fairlamb, G. Paek, C. C. Lin, T. Lowe, E. Magnier, P. … [View More]

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[vsnet-grb-info 37920] GRB 250327b: Liverpool Telescope optical observations
by GCN Circulars 28 Mar '25

28 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39902 SUBJECT: GRB 250327b: Liverpool Telescope optical observations DATE: 25/03/28 09:30:33 GMT FROM: A. Bochenek at Liverpool John Moores University <a.m.bochenek(a)2023.ljmu.ac.uk> D. A. Perley and A.Bochenek (LJMU) report: We observed the field of GRB250327b (Bouchet et al., GCN 39888) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 1x100s exposures in the SDSS g, r, i, and z filters, starting at 2025-03-28 00:17:… [View More]

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[vsnet-grb-info 37919] GRB 250322A: GRANDMA/TNOT optical upper limits
by GCN Circulars 28 Mar '25

28 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39901 SUBJECT: GRB 250322A: GRANDMA/TNOT optical upper limits DATE: 25/03/28 09:01:10 GMT FROM: duverne(a)apc.in2p3.fr E. Elhosseiny (NRIAG), N. Kochiashvili (AbAO), O. Pyshna (Caltech), Haichang Zhu (THU), A. Iskandar(XAO), Xiaofeng Wang (THU), Letian Wang (XAO) C. Andrade (UMN), S. Antier (OCA/IJCLAB), M. Coughlin (UMN), P-A. Duverne (APC), N. Guessoum (AUS), P. Hello (IJCLAB), S. Karpov (FZU), T. Pradier (Unistra/IPHC), D. Turpin (CEA-Saclay/Irfu) on … [View More]

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