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OISTER follow-up optical and near-infrared observations of Swift J0243.6+6124

ATel #10815; M. Yamanaka, M. Uemura, T. Nakaoka, N. Kawahara, and T. Abe (Hiroshima Univ.)
on 4 Oct 2017; 12:10 UT
Credential Certification: Masayuki Yamanaka (masyamanaka@hiroshima-u.ac.jp)

Subjects: Infra-Red, Optical, Transient

Referred to by ATel #: 10907

We performed optical and near-infrared imaging observations of Swift J0243.6+6124 (Kennea et al., ATEL #10809; Sugita et al., ATEL #10803) using the Hiroshima Optical and Near-InfraRed camera (HONIR; Akitaya et al. 2014, Proc. SPIE 9147, 91474) installed to the 1.5-m Kanata telescope at the Higashi-Hiroshima Observatory (HHO) on Oct 3.6 (UT) through the Optical and Infrared Synergetic Telescopes for Education and Research (OISTER) Target-of-opportunity observations. The optical counterpart of this object was already identified as USNO-B1.0 1514-0083050 (Kennea et al., ATEL #10809). The imaging data were obtained in the I, J and Ks bands. Our preliminary point-spread-function (PSF) photometry was performed using IRAF/DAOPHOT. We measured Swift J0243.6+6124 and a neighbor star located at the R.A.=02h43m29s.426, Decl.=+61d26m25s.95 (I=12.45 from the AAVSO Photometric All Sky Survey (APASS) DR9 catalog; Henden et al. 2016, J=10.59, and Ks=9.96 from 2MASS All-Sky Catalog of Point Sources; Cutri et al. 2003) as a reference star. The magnitudes of Swift J0243.6+6124 were obtained to be I=11.2, J=10.3, and Ks=9.4. This object is recorded in 2MASS with J=10.589 and Ks=9.961. Our measurements may be affected by the closest star. Further follow-up observations should be encouraged.