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ANTARES neutrino detection: LSGT B, V, R optical observation

ATel #8002; Myungshin Im, Changsu Choi (Seoul National University)
on 5 Sep 2015; 12:08 UT
Credential Certification: Myungshin Im (myungshin.im@gmail.com)

Subjects: Optical, X-ray, Neutrinos, Star, Transient, Variables

Referred to by ATel #: 8034, 8124

We observed the star USNO-B1.0 0626-0501169 (Smartt et al. ATel #7992) that coincides with the location of the Swift X-ray detection (Dornic et al. GCNC 18231, ATel #7987) within the error circle of the ANTARES neutrino source, using the Lee Sang Gak Telescope (LSGT - Im et al., 2015, JKAS, 48, 207) at the Siding Spring Observatory, Australia. The observation started at 2015 Sep 04, 10:34 UT, and a series of B, V, and R images were taken for about 1.5 hrs. No significant brightness variability was seen in all three bands, with the magnitudes being consistent with a constant value within 0.03 rms level. The lack of significant variability agrees with previous reports (Smartt et al. ATel #7992, Castro-Tirado et al. ATel. #7998, Dornic et al. ATel #8000). The light curve during this period can be found at http://astro.snu.ac.kr/~mim/antares/lc_antares150904.png . The photometry calibration was performed using AAVSO photometric all-sky survey stars within 5 arcmin from the USNO-B1.0 0626-0501169.