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Continued public INTEGRAL Target of Opportunity observations of V404 Cyg (GS2023+338)

ATel #7695; Erik Kuulkers (INTEGRAL Project Scientist, ESA/ESAC, Spain), on behalf of a larger collaboration
on 23 Jun 2015; 11:46 UT
Credential Certification: Erik Kuulkers (Erik.Kuulkers@sciops.esa.int)

Subjects: Optical, X-ray, Gamma Ray, Request for Observations, Binary, Black Hole, Transient, Variables

Referred to by ATel #: 7702, 7708, 7717, 7718, 7721, 7722, 7731, 7734, 7740, 7758, 7959

The black-hole X-ray transient V404 Cyg (GS 2023+338) recently entered a new outburst (e.g., GCN #17929, ATels #7646, #7647).

The extreme brightness of the transient in (hard) X-rays (GCNs #17929, #17932, #17935, #17938, #17943, #17944, #17945, #17946, #17948, #17949; ATels #7646, #7647, #7662, #7665, #7693, #7694) makes this a unique event, and INTEGRAL is the only observatory currently capable of doing high-resolution gamma-ray spectroscopy. Therefore, INTEGRAL will continue to observe V404 Cyg as long as the source remains bright.

INTEGRAL already performed a public observation from June 17-20 (Revolution 1554; see ATels #7662, #7693), and is now performing a pre-approved ToO programme from June 20-25 (Revolutions 1555-1556; PI: Rodriguez). The PI has kindly agreed to make the consolidated data publicly available, about a month after the observations have been performed. INTEGRAL observations after June 25 will be made immediately publicly available again, to maximise the scientific returns.

The exact observing strategy will depend on the evolution of the transient. We refer to the INTEGRAL Science Operations Centre webpages for further information: http://integral.esac.esa.int.

We encourage coordinated observations at all wavelengths along with the INTEGRAL observations.