Continued optical follow-up of AT2018cow/ATLAS18qqn using SAO 1m telescope
ATel #11772; Myungshin Im (SNU), Gu Lim (SNU), Jinguk Seo (SNU), Gregory S. Paek (SNU), on behalf of a larger collaboration
on 24 Jun 2018; 02:15 UT
Credential Certification: Myungshin Im (myungshin.im@gmail.com)
Subjects: Optical, Gamma-Ray Burst, Supernovae, Transient
Referred to by ATel #: 11796
At 2018-06-21 UT, we continued our observation of the transient, AT2018cow/ATLAS18qqn (Smartt et al. ATel #11727) using various telescopes including the SNU Astronomical Observatory (SAO) 1m telescope, the LOAO 1m telescope, the McDonald 0.8 m telescope, and the Lee Sang Gak Telescope (LSGT) at SSO.
BVRI images and optical spectra were taken with the SAO 1m telescope, starting at 2018-06-21 11:49:57 UT. We report the following magnitudes (host light is not subtracted) from the SAO 1m observation, which confirm earlier reports about the fading of this source by ~0.3mag/day (Zheng et al. ATel #11743, Ahumada et al. ATel #11752, Im et al. ATel #11750, Watson et al. ATel #11751, Smartt et al. ATel #11742, Fremling et al. ATel #11738, Chen et al. #11734, #11729, Wu et al. ATel #11758). The magnitudes are in Vega system, and calibrated against APASS stars in the vicinity.
V = 14.66 +- 0.02 UT: 2018-06-21 12:26
R = 14.55 +- 0.02 UT: 2018-06-21 12:14
The observation of this object is continuing.
