//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24124 SUBJECT: LIGO/Virgo S190408an: Gaia Photometric Alerts transient candidate DATE: 19/04/15 21:41:42 GMT FROM: Zuzanna Kostrzewa-Rutkowska at SRON Z. Kostrzewa-Rutkowska (SRON/RU), S. Hodgkin, A. Delgado, D.L. Harrison, M. van Leeuwen, G. Rixon, A. Yoldas (IoA Cambridge), D. Eappachen, P.G. Jonker (SRON/RU) on behalf of Gaia Alerts team report the discovery of a transient candidate within the probability skymap of S190408an (Singer et al. GCN 24069): --------------------------------------------------------------------------- Name TNSid Date [TCB] RaDeg DecDeg AlertMag URL --------------------------------------------------------------------------- Gaia19bij AT2019dmx 2019-04-10 13:34:31 347.81400 44.91844 18.94 http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19bij/ --------------------------------------------------------------------------- Acknowledgements: This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. ZKR, DE, and PGJ acknowledge support from the European Research Council under ERC Consolidator Grant agreement no 647208. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24134 SUBJECT: LIGO/Virgo S190408an: Gaia Photometric Alerts transient candidates DATE: 19/04/19 21:56:13 GMT FROM: Zuzanna Kostrzewa-Rutkowska at SRON Z. Kostrzewa-Rutkowska (SRON/RU), S. Hodgkin, A. Delgado, D.L. Harrison, M. van Leeuwen, G. Rixon, A. Yoldas (IoA Cambridge), D. Eappachen, P.G. Jonker (SRON/RU) on behalf of Gaia Alerts team report the discovery of transient candidates within the probability skymap of S190408an (Singer et al. GCN 24069): --------------------------------------------------------------------------- Name TNSid Date [TCB] RaDeg DecDeg AlertMag URL --------------------------------------------------------------------------- Gaia19bkj AT2019dpg 2019-04-16T20:07:27 335.67749 19.60641 18.95 http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19bkj/ Gaia19bkd AT2019dma 2019-04-16T13:48:35 343.70771 36.54362 17.34 http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19bkd/ Gaia19bju AT2019dmc 2019-04-12T09:34:12 338.36352 36.07027 16.19 http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19bju/ Gaia19bji AT2019doo 2019-04-12T15:26:12 345.74049 41.71289 18.91 http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19bji/ --------------------------------------------------------------------------- Acknowledgements: This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. ZKR, DE, and PGJ acknowledge support from the European Research Council under ERC Consolidator Grant agreement no 647208. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24139 SUBJECT: LIGO/Virgo S190408an: INTEGRAL follow-up observations DATE: 19/04/21 23:30:53 GMT FROM: Alexander Lutovinov at Space Research Inst.,IKI A. Lutovinov, S. Molkov (IKI, Russia) V. Savchenko, C. Ferrigno, E. Bozzo, T. Courvoisier (ISDC/UniGE, Switzerland) E. Kuulkers (ESTEC/ESA, The Netherlands) C. Sanchez (ESAC/ESA, Spain) S. Mereghetti (INAF IASF-Milano, Italy) D. Götz, Ph. Laurent, S. Schanne, B. Cordier (CEA, France) S.Antier, A. Coleiro, A. Goldwurm (APC, France) J. Rodi, A. Bazzano, L. Natalucci, F. Panessa, F. Onori, P. Ubertini (IAPS/INAF, Italy) J. Chenevez, S. Brandt (DTU, Denmark) R. Diehl, A. von Kienlin (MPE, Germany) A. Domingo, J. M. Mas-Hesse (CAB/CSIC-INTA, Spain) L. Hanlon, A. Martin-Carrillo, M.Doyle (UCD, Ireland) R. Sunyaev (IKI, Russia) J.-P. Roques, E. Jourdain, P. von Ballmoos (IRAP, France) report: The INTEGRAL observatory performed follow-up observations of the LIGO/Virgo compact binary merger candidate S190408an (GCN #24069) in the form of the fast TOO operational test. The observations were carried out from 2019-04-10 11:13:07 to 2019-04-10 17:10:47 in the staring and hexagonal dithering modes with a total observing time of approximately 18 ks. They were centred on the coordinates RA=350.2, Dec=-56.0 and covered ~42% of the LIGO/Virgo localization probability with the highest sensitivity. We do not detect any new sources in the complete IBIS/ISGRI (25-60 keV)  mosaicked image with the best sensitivity of 16.5 mCrab (1.6e-10 erg/cm2/s, 3-sigma upper level) in this energy range. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24154 SUBJECT: LIGO/Virgo S190408an: Liverpool Telescope follow-up imaging observations DATE: 19/04/23 12:17:13 GMT FROM: Peter Jonker at SRON/RU P.G. Jonker (SRON/RU), M. Fraser (UCD), Manuel Torres (IAC), Pablo Rodriguez-Gil (University of La Laguna), Kate Maguire (TCD), Z. Kostrzewa-Rutkowska (SRON/RU), report, on behalf of the International Time Proposal team, on Liverpool Telescope 3x300 sec r'-band imaging observations obtained on 2019-04-21T05:47:58 of the transient candidate(s) Gaia19bij found by the Gaia Alerts team (Kostrzewa-Rutkowska et al. GCN#24124) in the sky localisation region of GW190408 / S190408an (Singer et al. GCN 24069): Gaia19bij was found at r'~19, approximately 1.5" off-nuclear from a faint host galaxy. Acknowledgements: PGJ and ZKR acknowledge support from the European Research Council under ERC Consolidator Grant agreement no 647208. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24189 SUBJECT: LIGO/Virgo S190408an: Gaia Photometric Alerts transient candidates DATE: 19/04/25 16:20:31 GMT FROM: Zuzanna Kostrzewa-Rutkowska at SRON Z. Kostrzewa-Rutkowska (SRON/RU), S. Hodgkin, A. Delgado, D.L. Harrison, M. van Leeuwen, G. Rixon, A. Yoldas (IoA Cambridge), D. Eappachen, P.G. Jonker (SRON/RU) on behalf of Gaia Alerts team report the discovery of transient candidates within the probability skymap of S190408an (Singer et al. GCN 24069): --------------------------------------------------------------------------- Name TNSid Date [TCB] RaDeg DecDeg AlertMag URL --------------------------------------------------------------------------- Gaia19bla AT2019dpy 2019-04-19T01:28:39 357.26858 57.67220 18.66 http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19bla/ Gaia19bmd AT2019dur 2019-04-21T01:28:54 352.58222 60.82017 20.16 http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19bmd/ Gaia19bnd AT2019dyn 2019-04-15T15:47:08 336.45010 25.41967 16.52 http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19bnd/ --------------------------------------------------------------------------- Notes: Gaia19bmd - Gaia source declines by almost 2 mags over 3.5 months Acknowledgements: This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. ZKR, DE, and PGJ acknowledge support from the European Research Council under ERC Consolidator Grant agreement no 647208.