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Near-Infrared Photometry of V404 Cyg with CIRCE at the GTC

ATel #7663; Alan Garner (University of Florida), S. Eikenberry (UF), R. D. Stelter (UF), S. N. Raines (UF), M. Charcos, M. Edwards(LBTO), N. Lasso-Cabrera (CEFCA), A. Marin-Franch(CEFCA), J. Cenarro (CEFCA), J. G. Bennett (UF), S. Mullin (UF), B. Chinn (UF), K. Ackley(UF), F. Varosi(UF), C. Warner(UF), R. Frommeyer(UF), M. Herlevich(UF), P. Miller(UF), C. Murphey(UF), H. V. Donoso(UF), C. Vega(UF), C. Packham (UTSA), Y. Dallilar (UF), Riccardo Scarpa (Gran Telescopio Canarias), Andreas Gerarts (GTC), Hector de Paz Martin (GTC), Maria Martin Calero (GTC), William Miguel Hernandez Sanchez (GTC), Benjamin Siegel (GTC), Jose Antonio Rodriguez Losada (GTC), Francisco Francisco Perez (GTC), Jordi Molgo Sendra (GTC), Sergio Fernandez Acosta (GTC)
on 18 Jun 2015; 22:47 UT
Credential Certification: Stephen Eikenberry (eiken@astro.ufl.edu)

Subjects: Infra-Red, X-ray, Binary, Black Hole, Transient, Variables

Referred to by ATel #: 7667, 7671, 7674, 7677, 7681, 7686, 7694, 7702, 7721, 7722, 7734, 7959

In response to previous telegrams (ATELs #7646, #7647, #7650, #7655, #7658, #7659, #7661) concerning the activity in V404 Cyg, we observed the black hole X-ray binary on June 17, 2015 (04:51 UT to 5:06 UT) with the Canarias InfraRed Camera Experiment (CIRCE) instrument ( http://www.astro.ufl.edu/CIRCE ) on the Gran Telescopio Canarias 10.4-meter in La Palma, Spain during final commissioning observations. We used a single five-point dither pattern in each of J, H, and Ks, with a total 45-second exposure in each band. We calibrated the images using 2MASS point-source catalog photometry of other sources in the field to derive the following photometry for V404 Cyg.

J-band: 11.027 +/- 0.031

H-band: 11.185 +/- 0.029

Ks-band: 10.602 +/- 0.026

Photometric errors are dominated by the uncertainties in the reference star photometry.

This indicates that V404 Cyg was not only in outburst (2.5 mag brighter in J than the 2MASS value), but was much bluer in the NIR than during its nominal quiescent state (current J-Ks = 0.425 mag versus J-Ks=1.25 mag in 2MASS).

These observations were made possible due to the hard work of the engineers and astronomers at the GTC, who have been instrumental in CIRCE's installation and commissioning.