MASTER prediscovery observations of SSS130101:122222-311525

ATel #4700; H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA), D. Denisenko, V. Lipunov, E. Gorbovskoy, P. Balanutsa, V. Yecheistov, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov (Moscow State University, SAI), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov, A. Punanova (Ural Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov (Blagoveshchensk Educational University), V. Shumkov, S. Shurpakov, P. Podvorotny (MASTER team members),
on 4 Jan 2013; 14:31 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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Following the announcement of a bright transient SSS130101:122222-311525 detected by CRTS (Drake et al., ATel #4699) we have checked the archival observations of this field by MASTER-ICATE very wide field camera (72-mm f/1.2 lens + 11 Mpx CCD, FOV=24x16 sq. deg.) located at OAFA near San Juan, Argentina. The object is present on two combined images obtained on 2012 Dec. 16.357 UT (total exposure time 122 sec) and 2012 Dec. 17.248 UT (292 sec). The magnitude on both dates is 11.8+/-0.2m (unfiltered with Tycho-2 V zero point).

On Dec. 16 image the OT was located at 102 pixels from the edge of 4008x2672 CCD field of view. 200x200 crop of Dec. 16 MASTER-WFC image (zoomed at 200%) is posted at http://master.sai.msu.ru/static/OT/J122222-311525-MASTER-Arg-Dec16.jpg

MASTER-ICATE observations are showing that this OT was already in outburst at least 10 days before the Kyoto/Kiso Wide-field Survey images reported by H. Maehara in [vsnet-alert 15240] and 16 days before Siding Spring Survey detection. The last MASTER-WFC image of this area of sky without OT was taken on 2012 July 11.946 UT (combined exposure 280 sec, limiting mag 12.6).

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