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One 7 mag amplitude and one peculiar OTs detected by MASTER

ATel #4722; V. Shumkov, D. Denisenko, P. Balanutsa, V. Lipunov, E. Gorbovskoy, 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), P. Podvorotny, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 10 Jan 2013; 17:55 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Supernovae, Transient, Variables

MASTER OT J020106.28+115504.5 - CV?

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 02h 01m 06.28s +11d 55m 04.5s on 2013-01-09.47921 UT. The OT unfiltered magnitude is 16.1m (limit 18.4m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2011-09-06.74266 UT with magnitude limit in 'R' filter 19.1m.

There is an object SDSS J020106.28+115502.4 in 2" from the OT labeled as GALAXY in SDSS DR8. However, its magnitudes are consistent with those of a blue star: u=23.69(83), g=22.73(16), r=23.02(35), i=23.05(51), z=22.56(71). There is also a possible faint UV counterpart within 2" of the OT - GALEX J020106.4+115504 (FUV=N/A, NUV=23.18+/-0.67).

No previous outbursts were detected on more than 100 images by Palomar/NEAT project taken on 39 nights from 1995 Dec. 19 to 2006 Dec. 19, as well as in CRTS data.

Based on the amplitude of variability (~7m) we suggest that MASTER OT J020106.28+115504.5 is most likely a dwarf nova of UGSU or UGWZ type in superoutburst. Spectral and photometric observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/020106.28115504.5.png

MASTER OT J043941.97+291219.7 - peculiar object of unknown nature in PGC 1859062

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 04h 39m 41.97s +29d 12m 19.7s on 2013-01-09.55167 UT. The OT unfiltered magnitude is 17.9m (limit 18.5m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-09-26.79331 UT with unfiltered magnitude limit 19.2m. The OT is located near PGC 1859062 galaxy with 9"W and 8.9"S offset. The OT is also marginally seen on some archival MASTER-Kislovodsk images but was not detected as a transient before.

There are 2 red stars within 5" of the OT, one of them is reported to have a high proper motion which can be spurious (see Vizier query form).

This area of sky is not covered by SDSS. No previous outbursts were detected by CRTS. There are 4 Palomar/NEAT images available at SkyMorph site taken on 2001 Dec. 20 and 2002 Nov. 18. Nothing (except the galaxy background) is visible on the color-combined DSS image and on the sum of 4 NEAT images to the limiting magnitude ~21.5. Comparison of DSS and NEAT images (4'x4' FOV, 200% zoom) is uploaded to http://master.sai.msu.ru/static/OT/J043941+291219-DSS-NEAT.jpg

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/043941.97291219.7.png Follow up observations are required.

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