MASTER detection of CSS 140222:112037+302809 - possible Super-luminous Supernova

ATel #6045; V. Shumkov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), 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), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 6 Apr 2014; 06:12 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J112037.10+302808.9 = CSS140222:112037+302809 - possible Superluminous Supernova

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 11h 20m 37.10s +30d 28m 08.9s on 2014-04-03.75184 UT. The OT unfiltered magnitude is 17.1m (limit 18.9m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2013-12-30.96622 UT with unfiltered magnitude limit 19.2m.

The OT is identical to Catalina Sky Survey transient (Drake et al. 2009, ApJ, 696, 870) CSS140222:112037+302809. CSS light curve shows the following unfiltered magnitudes: 2014-01-10, <20.9 (latest non-detection); 2014-02-22, 18.8; 2014-03-07, 18.0; 2014-04-01, 17.5.

There is nothing at the position of the OT in any catalogs, on digitized Palomar plates and on SDSS color image to the limiting magnitude 23.5. No previous outbursts were detected by NEAT, CSS and MASTER. The nearest object in SDSS is 8.8" away SDSS J112036.76+302801.1 (g=22.60 r=21.82 i=22.00) listed as Galaxy but with a remark (too few good detections). There is another brighter galaxy 34.2" away SDSS J112039.40+302825.8 (g=19.81 r=18.84 i=18.42). We also note an infrared object AllWISE J112037.41+302810.7 (W1=17.34+/-0.15 W2=16.87+/-0.35) offset by 4.5".

Based on the slow rise to maximum (more than 40 days), OT J112037.10+302808.9 is likely a super-luminous Supernova (SLSN). Spectral confirmation is required. Discovery and reference images are available at: http://master.sai.msu.ru/static/OT/112037.10302808.9.png

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