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Early optical spectroscopy follow-up of V404 Cyg with GTC/OSIRIS

ATel #7699; M. D. Caballero-Garcia (CTU-FEL, Prague), A. J. Castro-Tirado (IAA-CSIC, Spain), S. Oates (IAA-CSIC, Spain), S. Jeong (IAA-CSIC, Spain) on behalf of a larger collaboration.
on 23 Jun 2015; 19:55 UT
Credential Certification: Maria D. Caballero-Garcia (mcaballe@brera.inaf.it)

Subjects: Optical, Binary, Black Hole, Transient

Referred to by ATel #: 7708, 7721, 7722, 7734, 7740, 7772, 7959

We report on our GTC/OSIRIS observations from the renewed activity in the black hole X-ray binary V404 Cyg (GCN#17929). Complementing observations reported previously (ATELs#7655,#7659,#7669) we observed the system on June 16, 2015 (03:31-03:42 UTC) with the OSIRIS spectrograph attached to the GTC-10.4m telescope in La Palma (Spain). We took 3x600s spectra using the R1000B (3650-7500A), R2500V (4500-6000A) and R2500I (7330-10000A) grisms.

We observe strong and single peaked H-alpha line in emission (H-beta and H-gamma are weaker but significant) amongst other possible emission lines we detect. H-beta has a complex double peak structure and HeI (4876A) has a complex profile, with absorption features overlaid.

We encourage further spectroscopic observations. We are thank the GTC team for a fast and efficient response to our ToO trigger.