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Possible Supernova and new CV detected by MASTER

ATel #5371; P. Balanutsa, V. Yecheistov, V. Lipunov, D. Denisenko, E. Gorbovskoy, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov (Moscow State University, SAI), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress, A. Frolova (Irkutsk State University), 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 and F. Podest (OAFA)
on 6 Sep 2013; 15:10 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Supernovae, Transient

MASTER OT J001502.14+413235.2 - PSN

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 00h 15m 02.14s +41d 32m 35.2s on 2013-08-30.86205 UT. The OT unfiltered magnitude is 17.1m (limit 18.2m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-11-15.76179 UT with unfiltered magnitude limit 20.5m.

The OT is located 3.1" west and 2.6" north of the center of spiral galaxy GALEX J001502.42+413232.6 (it is not present in PGC). Color-combined DSS finder chart with the position of the OT marked is uploaded to http://master.sai.msu.ru/static/OT/J001502+413235-BRIR5x5.jpg

Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/001502.14413235.2.png

MASTER OT J015527.18+474719.2 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 01h 55m 27.18s +47d 47m 19.2s on 2013-09-05.74904 UT. The OT unfiltered magnitude is 17.0m (limit 18.6m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2012-09-24.67877 UT with unfiltered magnitude limit 19.1m.

The OT at minimum is identical to the faint blue star USNO-B1.0 1377-0050829 (01 55 27.199 +47 47 20.77 B1=19.93 B2=20.69) also present in GSC 2.3.2 (01 55 27.223 +47 47 20.47 Fmag=20.18 jmag=21.57). Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J015527+474719-BRIR5x5.jpg (200% zoom).

The object was likely detected in outburst during 2MASS observations on 2000-02-16: 2MASS 01552720+4747206 J=15.79+/-0.08 H=15.73+/-0.15 K=15.48+/-0.18. Nothing is present at this position in 1RXS, GALEX, GCVS and AAVSO VSX. This area of sky in Perseus is not covered by CRTS and SDSS.

We suggest that MASTER OT J015527.18+474719.2 is a new cataclysmic variable, likely dwarf nova in outburst. Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/015527.18474719.2.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net