Difference: GCNCIRCULAR21736 ( vs. 1)

V.M.Lipunov, E. Gorbovskoy, V.G.Kornilov, N.Tyurina, V.Shumkov, D.Kuvshinov,
P.Balanutsa, O.Gress, A.Kuznetsov, M.I.Panchenko, A.V.Krylov, I.Gorbunov
Lomonosov Moscow State University, Sternberg Astronomical Institute

R. Rebolo, M. Serra-Ricart, G. Israelian, N.Lodiu
The Instituto de Astrofisica de Canarias

V.Yurkov, Yu.Sergienko, A.Gabovich
Blagoveschensk Educational State University, Blagoveschensk

N.M. Budnev, O. Gress, K. Ivanov, S.Yazev
Irkutsk State University

A. Tlatov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory

R.Podesta, C.Lopez, F.Podesta
Observatorio Astronomico Felix Aguilar (OAFA) , National University of San
Juan, Argentina

H.Levato, C.Saffe
Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),
San Juan, Argentina

D.Buckley, S.Potter, M.Kotze,
South African Astronomical Observatory

MASTER OT J033744.97+723159.0 (lipunov, Gorbovskoy, Kornilov et al., GCN LVC
GCN 21719, 21780) is cheked recently by MASTER-IAC (Tenerife, Spain). Our
photometrical results are:

Date Time JD Filter Mag A* Mag_cor

2017-08-27 22:46:16 2457993.4487963 B 18.12 1.41 16.71
2017-08-27 22:50:10 2457993.4515046 V 16.81 1.07 15.74
2017-08-27 22:50:10 2457993.4515046 R 16.04 0.80 15.24
2017-08-27 22:46:16 2457993.4487963 I 15.94 0.51 15.43

* for E(B-V) = 0.3436 and Av = 3.1 * E(B-V) = 1.065

===========================
Uncorrected magnitude:

B = 18.1226
V = 16.8078
R = 16.0422
I = 15.9435

E(B-V) = 0.3436 (http://irsa.ipac.caltech.edu/applications/DUST/ )

Av = 3.1 * E(B-V) => Av = 1.06516
(http://www.astro.ncu.edu.tw/~wchen/Courses/ISM/11.Extinction.pdf page 17)

=> http://www.astro.ncu.edu.tw/~wchen/Courses/ISM/11.Extinction.pdf (page 22 )

So, MASTER OT J033744.97+723159.0 is reddening (cf, Im et al, LVC GCN 21723).

The spectroscopic observations are requared.

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-- ShaonGhosh - 29 Aug 2017