Martí Ribas, JosepZamanov, R. K.Paredes i Poy, Josep MariaRibó Gomis, Marc2013-09-172013-09-1720010374-0676https://hdl.handle.net/2445/46025In this note we report high time resolution V Johnson photometry of the microquasar V4641 Sgr (SAX J1819.3-2525 - XTE J1819-254). This source was discovered as an X-ray transient by BeppoSAX and RossiXTE satellites (In't Zand et al. 1999; Markwardt et al. 1999). On 1999 September, a very fast transient optical and X-ray outburst was observed, reaching up to ...4 p.application/pdfeng(c) Martí Ribas, Josep et al., 2001Fotometria astronòmicaForats negres (Astronomia)EspectroscòpiaQuàsarsEstelsRaigs XAstrometriaAstronomical photometryBlack holes (Astronomy)Spectrum analysisQuasarsStarsX-raysAstrometryinfo:eu-repo/semantics/article1865002013-09-17info:eu-repo/semantics/openAccess