TITLE: GCN CIRCULAR NUMBER: 24106 SUBJECT: LIGO/Virgo S190408an: Gaia Photometric Alerts transient candidate DATE: 19/04/12 14:24:33 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 --------------------------------------------------------------------------- Gaia19bhc AT2019ddt 2019-04-07 15:17:19 347.68061 47.16521 15.26 http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19bhc/ --------------------------------------------------------------------------- The transient was discovered by the MASTER survey on 2019-04-09.00417 UT (MASTER OT J231043.63+470956.4; Lipunov et al. GCN 24084). However, the transient was observed by Gaia one day before the LIGO/Virgo trigger thereby re-enforcing the conclusion from Onori et al. (GCN 24090) and Valeev et al. (GCN 24092) that it is unrelated to the GW event S190408an. 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.