Difference: GCNCIRCULAR21738 ( vs. 1)

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META TOPICPARENT	name="LVCGCNs"

TITLE: GCN CIRCULAR
NUMBER: 21738
SUBJECT: LIGO/Virgo G299232: Continued observation of the transient near NGC 1343
DATE: 17/08/29 02:11:20 GMT
FROM: Myungshin Im at Seoul National U <myungshin.im@gmail.com>

M. Im, C. Choi, G. Lim, J. Kim, H. M. Lee (SNU), M. J. Kim, H. J. Lee (KASI) on behalf of the KU collaboration

At 2017-08-28 11:00 (UT), we continued the observation of MASTER OTJ033744.97+723159.0 near NGC 1343 (Lipunov et al. GCN 21719, 21720) with the SQUEAN instrument on the McDonald Observatory’s 2.1m telescope. AB magnitudes before and after the Galactic extinction correction are given below.

Before | Extinction | After

g 16.97 1.125 15.85

r 16.49 0.778 15.71

i 16.56 0.578 15.98

The object has brightened by ~0.2 mag in one day and stayed blue in r-i but has a redder color in g-r (c.f. Lipunov et al. GCN 21736). The brightening is consistent with the report that this is a type IIb SN before maximum (Jonker et al. GCN 21737).

-- ShaonGhosh - 29 Aug 2017

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