MASTER-Net Prediscovery and Follow-up Observations of SN 2014J in M82

ATel #5795; D. Denisenko, E. Gorbovskoy, V. Lipunov, P. Balanutsa, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, A. Rufanov, V. Vladimirov, V. Yecheistov (Lomonosov Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 23 Jan 2014; 14:09 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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Following the posting of PSN J09554214+6940260 at CBAT TOCP on 2014 Jan. 22 we have obtained confirmation images by MASTER-Amur telescope and also checked our archival database. The area of M82 was observed by MASTER-II telescope (0.40-m f/2.5 reflector + 4Kx4K CCD, FOV 2.1x2.1 deg.) in Kislovodsk with two triplets of unfiltered 60-sec exposures on 2014 Jan. 03.77-03.81 UT. The object is not visible on the combined image (limiting magnitude of the image 20.6). The identical MASTER-II telescope in Blagoveschensk (MASTER-Amur) has observed M82 on 2014 Jan. 13.56-13.59 UT, 2 days before the first prediscovery detection by K. Itagaki (CBET #3792). The object is not present on the combined image to m_lim=18.5, deeper than the limit reported by K. Itagaki (<17.0 on Jan. 13.591 UT). Stacked MASTER images of Jan. 03 and Jan. 13 are uploaded to http://master.sai.msu.ru/static/OT/M82-2014Jan03-13-MASTER.jpg

MASTER-Amur has observed the supernova in the white light on Jan. 22.399 UT and in V and R filters on Jan. 22.425 and 22.447 UT. Our first unfiltered follow up image is available at http://master.sai.msu.ru/static/M82_SN.png The results of our filtered photometry on the combined images are as follows (mid-exposure time is given): 2014 Jan. 22.435 UT, V=11.55, R=10.79. V and R magnitudes of reference stars were taken from AAVSO photometry table. Color-combined image by MASTER-Amur is uploaded toSN2014J-MASTER-Amur-Jan22.jpg"> http://master.sai.msu.ru/static/OT/SN2014J-MASTER-Amur-Jan22.jpg

MASTER-VWF very wide-field camera in Tunka (D=72 mm f/1.4 lens + 11-Mpix CCD, FOV 24x16 sq. deg, scale 21" per pixel) was observing the field of M82 in the routine survey mode with multiple 5-sec unfiltered exposures. We have analysed the combined images on 2014 Jan. 18-22. Supernova is marginally visible starting from Jan. 20. Formal photometry of SN is given in the table below. It shows that the supernova was brightening from Jan. 18.

 
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Date, UT    Exp,  SN mag.  Instrument and 
2014        sec   filter   observatory 
--------------------------------------------- 
Jan. 03.77  360  >20.6 U  MASTER-II-Kislovodsk 
Jan. 13.56  360  >18.5 U  MASTER-II-Amur 
Jan. 18.774 105  >12.0 U  MASTER-VWF-Tunka 
Jan. 19.743 105   11.8 U  MASTER-VWF-Tunka 
Jan. 20.683 110   11.6 U  MASTER-VWF-Tunka 
Jan. 21.635 100   11.3 U  MASTER-VWF-Tunka 
Jan. 22.399  60   10.91U  MASTER-II-Amur 
Jan. 22.425  60   11.55V  MASTER-II-Amur 
Jan. 22.425  60   10.79R  MASTER-II-Amur 
Jan. 22.516 110   10.88U  MASTER-VWF-Tunka 
--------------------------------------------- 
U - unfiltered magnitude calibrated against USNO-B catalog with combined magnitude (0.8R + 0.2B) for MASTER II and calibrated against Tycho V magnitudes for MASTER VWF. 

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