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KAIT and GRANDMA further follow-up of AT2018cow/ATLAS18qqn

ATel #11743; W. Zheng (UC Berkeley), A. V. Filippenko (UC Berkeley), S. Antier (LAL), M. Boer (Artemis), N. Christensen (Artemis), B. Cordier (CEA), M. Coughlin (Caltech), D. Coward (UWA), B. Gendre (UWA), X. Han (NAOC), A. Klotz (IRAP), W. Jing (NAOC), N. Leroy (LAL), J. Mao (GMG), D. Turpin (NAOC), J. Y. Wei (NAOC), C. Wu (NAOC) for the KAIT and GRANDMA teams
on 20 Jun 2018; 22:19 UT
Credential Certification: Sarah Antier (antier@lal.in2p3.fr)

Subjects: Optical, Gamma-Ray Burst, Supernovae, Transient

Referred to by ATel #: 11749, 11753, 11757, 11758, 11760, 11772, 11796

We observed the field of ATLAS18qqn/AT2018cow (Smartt et al. ATel #11727) consecutively in Bessel filters BVRI (and in clear) with the KAIT telescope at the Lick observatory. Observations began at 2018-06-20 04:25:38 UT and ended at 2018-06-20 09:37:35.990 UT. 15 separate sets of observations were performed. The first set of Vega magnitudes (not corrected for host galaxy background contamination) are as follows: B = 14.38 +/ 0.06 mag, V = 14.20 +/ 0.03 mag, R = 14.25 +/ 0.03 mag, I = 14.41 +/ 0.03 mag, Over the 5 hrs of observations, the object faded 0.06, 0.09, 0.05, and 0.06 mags in B, V, R, I respectively. This fade is consistent with the values reported by GROND (Chen and Schady, Atel #11734).