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GCN Circular 21736

Subject
LIGO/Virgo G299232/PGWB170825.55: MASTER OT J033744.97+723159.0 inside 25m isophota of the NGC1343 galaxy is reddening
Date
2017-08-28T19:22:37Z (7 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov2007@gmail.com>
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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