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Optical Outburst of the Halo Black Hole X-ray Transient XTE J1118+480

ATel #383; C. Zurita (IAC), D. Rodríguez (M-1 group), P. Rodríguez-Gil (IAC), J. Casares (IAC), T. Shahbaz (IAC), J. Acosta (IAC), G. Gómez-Velarde (IAC), C. Abajas (IAC), T. Muñoz-Darias (IAC)
on 12 Jan 2005; 22:03 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Manuel Torres (mtorres@cfa.harvard.edu)

Subjects: Request for Observations, Binary, Black Hole, Transient

Referred to by ATel #: 384, 385, 386, 387, 389, 393, 399, 402, 412, 420, 424, 428

We report the discovery of a new outburst of the black hole X-ray transient XTE J1118+480 (IAUC # 7418 , ATEL#64, #67). Observations carried out with the 0.8m IAC80 telescope at the Observatorio del Teide on UT 2005 Jan 9.26 show J1118+480(=KV UMa) at R=14.02, almost 5 mag brighter than the reported quiescent level (IAUC # 7868 ). On UT Jan 12.12-12.30 J1118+480 brightened to R=13.41 (V-R=0.19) with significant variability of ~0.05 mag amplitude. Observations at all wavelengths urged.