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.
