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GCN Circular 21587

Subject
LIGO/Virgo G298048: MASTER photometry of the SSS17a in NGC 4993
Date
2017-08-19T08:10:30Z (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

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

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

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

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

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

As we reported in LVC GCN 21546 MASTER-OAFA have imaged the BAYESTAR 
localization map of LIGO/Virgo G298048 (GCN 21513).

MASTER-SAAO  have new images of  NGC 4993 galaxy starting 2017-08-18 17:06:55 
UT in B, R and unfiletred with magnitude limit 19.8 (Lipunov et al., LVC 
GCN 21570). We see
object in B, R and unfiltered images detected by Coulter et al. (LVC GCN 
21529), Allam et  al. (LVC GCN 21530), Yang et al. (LVC GCN 21531), 
Melandri et al.  (LVC GCN 21532), Lipunov et al., (LVC GCN 21546).

B = 18.5 +- 0.2
R = 17.5 +- 0.2
W = 18.0 +- 0.2

The unfiltered magnitude not changed with respect to first observations 
(Lipunov et al., LVC GCN 21546)

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