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

[vsnet-grb-info 34593] GRB 240619A: detection of a radio counterpart with AMI-LA
by GCN Circulars 24 Jun '24

24 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36744 SUBJECT: GRB 240619A: detection of a radio counterpart with AMI-LA DATE: 24/06/24 10:36:50 GMT FROM: Lauren Rhodes at Oxford <lauren.rhodes(a)physics.ox.ac.uk> Lauren Rhodes, Rob Fender (Oxford), Dave Green, Dave Titterington (Cambridge) report: We observed the field of GRB 240619a (GCN 36694) with the Arcminute Microkelvin Imager - Large Array (AMI-LA) at 15.5 GHz beginning at UT 13:45:34 on 22-June-2024 for a total of 4 hours. The flux standard 3c286 was used to calibrate the bandpass response and flux scale of the AMI-LA and J1051+2119 was used as an interleaved complex gain calibrator. We detected an unresolved radio source at the position of the afterglow candidate (GCN 36715) with a flux density of about 1.5mJy/beam. The rms noise in the field is about 60uJy/beam. More observations are ongoing. We thank the staff at the Mullard Radio Astronomy Observatory for carrying out these observations and operating the AMI-LA. View this GCN Circular online at https://gcn.nasa.gov/circulars/36744. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34592] GRB 240624A: Swift detection of a burst
by GCN Circulars 24 Jun '24

24 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36743 SUBJECT: GRB 240624A: Swift detection of a burst DATE: 24/06/24 06:10:39 GMT FROM: David Palmer at LANL <palmer(a)lanl.gov> N. J. Klingler (GSFC/UMBC/CRESSTII), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team: At 06:01:09 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 240624A (trigger=1238732). Swift did not slew to the location due to an observing constraint. The BAT on-board calculated location is RA, Dec 102.444, -6.543 which is RA(J2000) = 06h 49m 47s Dec(J2000) = -06d 32' 36" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 5 sec. The peak count rate was ~2200 counts/sec (15-350 keV), at ~1 sec after the trigger. Due to a Sun observing constraint, Swift cannot slew to the BAT position until 10:01 UT on 2024 August 15. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is N. J. Klingler (noelklin AT umbc.edu). 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/36743. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34591] LIGO/Virgo/KAGRA S240623dg: Retraction of GW compact binary merger candidate
by GCN Circulars 24 Jun '24

24 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36742 SUBJECT: LIGO/Virgo/KAGRA S240623dg: Retraction of GW compact binary merger candidate DATE: 24/06/23 23:47:57 GMT FROM: Young-Min Kim at KASI <young-min.kim(a)ligo.org> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: The trigger S240429an is no longer considered to be a candidate of interest. This candidate was initially identified by one or more early-warning analyses by matching partial signal templates to the data. Analysis of additional data up to the putative merger time, with full signal templates, did not make a significant detection, indicating that the initial candidate was likely due to transient noise. View this GCN Circular online at https://gcn.nasa.gov/circulars/36742. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34590] EP240618a: NOT further optical observations
by GCN Circulars 23 Jun '24

23 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36741 SUBJECT: EP240618a: NOT further optical observations DATE: 24/06/23 02:56:10 GMT FROM: Dong Xu at NAOC/CAS <dxu(a)nao.cas.cn> X. Liu, S.Y. Fu, J. An, Z.P. Zhu, S.Q. Jiang, D. Xu (NAOC), M. Turkki (NOT) report on behalf of a large collaboration: Following the first epoch of the observations of EP240618a (Sun et al., GCN 36690) at the the 2.56-m Nordic Optical Telescope (NOT, Liu et al., GCN 36736), we have carried out the second epoch at the NOT. Observations started at 2024-06-23T00:13:37, i.e., ~ 4.8 day after the EP trigger, and again 12x120 s Sloan z-filter images were obtained. The candidate in the 1st epoch is clearly detected in the 2nd epoch with comparable brightness in z-band. Specifically, it has z = 21.03 +/- 0.05 in the 1st epoch and z = 21.05 +/- 0.06 mag in the 2nd epoch, more or less affected by the nearby bright star ~1.3 arcsec away and the photometric method. As the candidate is probably mixed with the bright star in the Pan-STARRS image, we also measure the candidate+star in the NOT images. Both NOT epochs yield the same magnitude of z ~ 18.4 mag, being consistent with the value by Pan-STARRS. Hence, we conclude that the candidate is likely not the counterpart of EP240618a. Meanwhile, we searched for other possible candidates by image subtraction of the two NOT epochs within the 30-arcsec EP/FXT error circle (Sun et al., GCN 36690). Neither uncatalogued optical transient nor apparent brightening of catalogued source is found. View this GCN Circular online at https://gcn.nasa.gov/circulars/36741. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34589] GRB 240619A: J-band detection with WINTER
by GCN Circulars 23 Jun '24

23 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36740 SUBJECT: GRB 240619A: J-band detection with WINTER DATE: 24/06/23 01:24:35 GMT FROM: Geoffrey Mo at MIT <gmo(a)mit.edu> Geoffrey Mo (MIT), Robert Stein (Caltech), Benjamin Schneider (MIT), Viraj Karambelkar (Caltech), Danielle Frostig (MIT), Nathan Lourie (MIT), Tomas Ahumada (Caltech), Robert Simcoe (MIT), and Mansi Kasliwal (Caltech) report: We observed the field of GRB 240619A (Fermi GBM team, GCN 36694; Greiner et al., GCN 36695; Dalessi et al., GCN 36717; Torii et al., GCN 36719; Dafcikova et al., GCN 36724) in the near-infrared J-band with the Palomar 1-m telescope, equipped with the 1-square degree WINTER camera (Lourie et al. 2020). Observations began at 2024-06-21T03:44:09 UTC (~48 hours after the GRB) and consisted of 30 x 120 s exposures. The images were processed using the WINTER data reduction pipeline (https://github.com/winter-telescope/mirar, https://doi.org/10.5281/zenodo.10888436), with image subtraction performed relative to J-band images from the UKIRT Hemisphere survey (Dye et al., 2017). We report the marginal (3-sigma) detection of a source at the position of the GOTO-discovered counterpart (Gompertz et al., GCN 36715; Lipunov et al., GCN 36708; Evans et al., GCN 36720; Capalbi et al., GCN 36721), with magnitude J ~ 19.3 (AB). WINTER (Wide-field INfrared Transient ExploreR) is a partnership between MIT and Caltech, housed at Palomar Observatory, and funded by NSF MRI, NSF AAG, the David and Lucile Packard Foundation, and the MIT Kavli Institute for Astrophysics and Space Research. View this GCN Circular online at https://gcn.nasa.gov/circulars/36740. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34588] GRB 240619A: J-band detection with WINTER
by GCN Circulars 23 Jun '24

23 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36739 SUBJECT: GRB 240619A: J-band detection with WINTER DATE: 24/06/23 01:24:30 GMT FROM: Geoffrey Mo at MIT <gmo(a)mit.edu> Geoffrey Mo (MIT), Robert Stein (Caltech), Benjamin Schneider (MIT), Viraj Karambelkar (Caltech), Danielle Frostig (MIT), Nathan Lourie (MIT), Tomas Ahumada (Caltech), Robert Simcoe (MIT), and Mansi Kasliwal (Caltech) report: We observed the field of GRB 240619A (Fermi GBM team, GCN 36694; Greiner et al., GCN 36695; Dalessi et al., GCN 36717; Torii et al., GCN 36719; Dafcikova et al., GCN 36724) in the near-infrared J-band with the Palomar 1-m telescope, equipped with the 1-square degree WINTER camera (Lourie et al. 2020). Observations began at 2024-06-21T03:44:09 UTC (~48 hours after the GRB) and consisted of 30 x 120 s exposures. The images were processed using the WINTER data reduction pipeline (https://github.com/winter-telescope/mirar, https://doi.org/10.5281/zenodo.10888436), with image subtraction performed relative to J-band images from the UKIRT Hemisphere survey (Dye et al., 2017). We report the marginal (3-sigma) detection of a source at the position of the GOTO-discovered counterpart (Gompertz et al., GCN 36715; Lipunov et al., GCN 36708; Evans et al., GCN 36720; Capalbi et al., GCN 36721), with magnitude J ~ 19.3 (AB). WINTER (Wide-field INfrared Transient ExploreR) is a partnership between MIT and Caltech, housed at Palomar Observatory, and funded by NSF MRI, NSF AAG, the David and Lucile Packard Foundation, and the MIT Kavli Institute for Astrophysics and Space Research. View this GCN Circular online at https://gcn.nasa.gov/circulars/36739. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34587] LIGO/Virgo/KAGRA S240622h: Updated Sky localization and Source Classification
by GCN Circulars 23 Jun '24

23 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36738 SUBJECT: LIGO/Virgo/KAGRA S240622h: Updated Sky localization and Source Classification DATE: 24/06/22 20:13:54 GMT FROM: Michael J. Williams at University of Portsmouth <michael.williams(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 S240622h (GCN Circular 36730). 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/S240622h After parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (99%), Terrestrial (1%), NSBH (<1%), or BNS (<1%). For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 199 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1350 +/- 303 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] Rose et al. (2022) arXiv:2201.05263 and Pankow et al. PRD 92, 023002 (2015) doi:10.1103/PhysRevD.92.023002 View this GCN Circular online at https://gcn.nasa.gov/circulars/36738. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34586] Fermi trigger No 740744838: Global MASTER-Net observations report
by GCN Circulars 23 Jun '24

23 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36737 SUBJECT: Fermi trigger No 740744838: Global MASTER-Net observations report DATE: 24/06/22 19:31:02 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB240622.44 (trigger No 740744838,09h 39m 07.92s , +74d 46m 01.2s, R=35.72) errorbox 29252 sec after notice time and 29284 sec after trigger time at 2024-06-22 18:35:17 UT, with upper limit up to 15.7 mag. Observations started at twilight. The observations began at zenith distance = 75 deg. The sun altitude is -9.8 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB240622.44 errorbox 30316 sec after notice time and 30348 sec after trigger time at 2024-06-22 18:53:02 UT, with upper limit up to 16.6 mag. Observations started at twilight. The observations began at zenith distance = 81 deg. The sun altitude is -16.2 deg. The galactic latitude b = 37 deg., longitude l = 137 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2503268 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 29314 | 2024-06-22 18:35:17 | MASTER-Tavrida | (02h 37m 42.72s , +60d 36m 40.0s) | C | 60 | 13.8 | 30003 | 2024-06-22 18:46:46 | MASTER-Tavrida | (03h 43m 04.34s , +55d 36m 54.3s) | C | 60 | 14.2 | 30103 | 2024-06-22 18:48:26 | MASTER-Tavrida | (02h 37m 38.22s , +60d 38m 07.0s) | C | 60 | 14.8 | 30103 | 2024-06-22 18:48:26 | MASTER-Tavrida | (02h 37m 46.34s , +60d 34m 19.3s) | C | 60 | 15.4 | 30201 | 2024-06-22 18:50:04 | MASTER-Tavrida | (02h 54m 10.92s , +60d 42m 42.9s) | C | 60 | 14.7 | 30201 | 2024-06-22 18:50:04 | MASTER-Tavrida | (02h 53m 53.36s , +60d 47m 24.2s) | C | 60 | 14.8 | 30379 | 2024-06-22 18:53:02 | MASTER-Kislovodsk | (03h 46m 17.11s , +56d 07m 27.5s) | C | 60 | 16.6 | 31280 | 2024-06-22 19:08:03 | MASTER-Tavrida | (03h 43m 14.23s , +55d 27m 38.2s) | C | 60 | 13.3 | 31280 | 2024-06-22 19:08:03 | MASTER-Tavrida | (03h 43m 24.91s , +55d 23m 54.7s) | C | 60 | 14.2 | 31376 | 2024-06-22 19:09:39 | MASTER-Tavrida | (02h 54m 07.26s , +60d 41m 39.2s) | C | 60 | 15.7 | 31376 | 2024-06-22 19:09:39 | MASTER-Tavrida | (02h 53m 51.84s , +60d 46m 50.7s) | C | 60 | 15.3 | 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/36737. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34585] EP240618a: NOT optical counterpart candidate
by GCN Circulars 23 Jun '24

23 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36736 SUBJECT: EP240618a: NOT optical counterpart candidate DATE: 24/06/22 18:53:13 GMT FROM: Dong Xu at NAOC/CAS <dxu(a)nao.cas.cn> X. Liu, S.Y. Fu, J. An, Z.P. Zhu, S.Q. Jiang, D. Xu (NAOC), J. Terwel (NOT) report on behalf of a large collaboration: We observed the field of EP240618a detected by EP/WXT (Sun et al., GCN 36690) using the the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 00:07:28 UT on 2024-06-20, i.e., ~ 1.77 day after the EP trigger, and 12x120 s Sloan z-filter images were obtained. An uncatalogued optical transient (OT), within the 30 arcsec EP/FXT error circle (Sun et al., GCN 36690), is detected in the stacked z-band image at coordinates: R.A. (J2000)= 18:46:35.78 Dec. (J2000)= +23:50:13.17 with an uncertainty of ~ 0.2 arcsec. The OT is 1.3 arcsec away from a nearby 18.4 magnitude star, and its preliminary photometry is z ~ 21 mag at 1.78 day since the EP trigger, calibrated against nearby Pan-STARRS stars and not corrected for Galactic extinction. The OT is not detected by early TRT observation (Tinyanont et al., GCN 36710) down to R ~ 20.3 mag, and not by LCO observation (Li et al., GCN 36731) down to r ~ 21.5 mag. If EP240618a is a GRB, the z-r color might indicate high redshift. A finding chart of the candidate is available at https://drive.google.com/file/d/1pPAKrFyVvk3D7QnpgCfBQHim1ieGQ8zq/view?usp=… A second epoch in z-band at the NOT has been scheduled for the night of June 22. View this GCN Circular online at https://gcn.nasa.gov/circulars/36736. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34584] LIGO/Virgo/KAGRA S240621em: Updated Sky localization and Source Classification
by GCN Circulars 22 Jun '24

22 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36735 SUBJECT: LIGO/Virgo/KAGRA S240621em: Updated Sky localization and Source Classification DATE: 24/06/22 14:26:04 GMT FROM: Nihar.Gupte(a)aei.mpg.de 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 S240621em (GCN Circular 36729). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S240621em After parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (96%), Terrestrial (4%), NSBH (<1%), or BNS (<1%). For the Bilby.offline0.multiorder.fits sky map, the 90% credible region is 3069 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 7458 +/- 2672 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] Rose et al. (2022) arXiv:2201.05263 and Pankow et al. PRD 92, 023002 (2015) doi:10.1103/PhysRevD.92.023002 View this GCN Circular online at https://gcn.nasa.gov/circulars/36735. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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