Optical follow-up observation of AT2018cow/ATLAS18qqn
Myungshin Im (SNU), Gu Lim (SNU), Jinguk Seo (SNU), Gregory S. Paek (SNU), Hwara Kim (SNU), Joonho Kim (SNU), Changsu Choi (SNU), Hyun-Il Sung (KASI), on behalf of a larger collaboration
At 2018-06-20 UT, we observed 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. A series of BVRI and griz data were obtained. From the SAO 1m telescope image taken at 2018-06-20 12:34:26 UT, we find the following magnitudes (host light is not subtracted) for the object. The magnitudes are in Vega system, and calibrated against APASS stars in the vicinity. V = 14.21 +- 0.02, R = 14.29 +- 0.03. The observation of this object is continuing. We thank the operators of the LOAO 1m telescope, Jae-Hyuk Yoon and In-Kyung Baek for their assistance with the observation.
optical,gamma ray,cataclysmic variable,gamma-ray burst,star,supernovae,transient,variables