TITLE:   GCN CIRCULAR
NUMBER:  21782
SUBJECT: LIGO/Virgo G299232/PGWB170825.55: MASTER archive images of the SIWFT/UVOT and MASTER OT J033744.97+723159.0 in NGC1343 galaxy before 25
DATE:    17/09/01 07:49:22 GMT
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, Yu. Ishmuhamedova-Rabinovich,
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

Analyzing MASTER database archive images of MASTER OT J033744.97+723159.0 
(Lipunov et al. GCN 21720, GCN2136) we found 1 image on 2017-08-19 
22:32:24.443 with clearly seen OT with unfiltered m_OT=18.6 .

During Fermi GBM trigger 521687456  inspection MASTER-Kislovodsk observed 
the area  RA(2000)=(18.200 +29.540) +-5.25deg GRB_error (statistical only) 
on 2017-07-14 22:54:12UT with mlim=18.7 .

There is SIWFT/UVOT source (Emery et al., LVC GCN 21733, 21758) from 
LIGO/VIRGO G299232 error-box (Siellez et al., GCN 21693)
with m_OT~18.7 on 2017-07-14 22:54:12UT

The archival image is available at:
http://master.sai.msu.ru/static/OT/MASTERKislovodsk20170714.jpg

We are gratiful all follow up photometry (Im et al. 
GCN21723; Im et al. GCN21738; Butler et al. GCN21742, Roberts et al.
GCN 21752) and spectral (Jonker et al. GCN 21737; Roberts et al. GCN 21752; Copperwheat et al. 
GCN21755; Liming Rui et al. GCN 21780) observations.

This SN IIb is placed very far from  NGC 1343 galaxy center at distance 
~20 kpc. The  massive star progenitor in the no star formation 
area  is very strange.

This message can be citted.