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Four OT's detected by MASTER

ATel #5201; S. Shurpakov, V. Shumkov, D. Denisenko, V. Lipunov, E. Gorbovskoy, P. Balanutsa, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov (Moscow State University, SAI), 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), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), P. Podvorotny, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (OAFA)
on 10 Jul 2013; 09:57 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Supernovae, Transient

MASTER OT J181751.42+594937.6 - new flare star of UV Ceti type

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 18h 17m 51.42s +59d 49m 37.6s on 2013-07-08.77560 UT. The OT unfiltered magnitude is 15.9m (limit 19.6m). The object has faded to 16.9m on the image obtained on 2013-07-08.80325 UT (40 minutes later). The OT is seen in 9 images. There is no minor planet at this place. We have unfiltered reference image with the object at 17.9m on 2013-06-25.88003 UT (limiting magnitude 18.6).

The object is identical to the red star USNO-B1.0 1498-0251445 (18 17 51.370 +59 49 37.26 R1=18.86 B2=20.54 R2=18.91 I=15.98). It also has an IR countepart 2MASS 18175142+5949371 (J=14.52+/-0.04 H=13.97+/-0.04 K=13.65+/-0.04). Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J181751+594937-BRIR.jpg (10x10' FOV). There is nothing at this position in 1RXS, GALEX, GCVS and AAVSO VSX. This area of sky in Draco is not covered by SDSS and Catalina Sky Survey.

Based on the red color (J-K=0.87+/-0.06), flare amplitude and duration we conclude that MASTER OT J181751.42+594937.6 is the new variable star of UV Ceti type (flaring red dwarf).

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/181751.42594937.6.png Follow up observations are encouraged.

MASTER OT J000028.33+013632.9 - PSN in SDSS J000028.30+013630.7

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 00h 00m 28.33s +01d 36m 32.9s on 2013-07-06.98731 UT. The OT unfiltered magnitude is 18.8m (limit 19.2m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-09-26.99810 UT with unfiltered magnitude limit 19.9m. Thre is SDSS J000028.30+013630.7 galaxy with 2.1 arcsec offset.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/000028.33013632.9.png

MASTER OT J183915.11+141656.4 - CV?

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 18h 39m 15.11s +14d 16m 56.4s on 2013-07-08.82010 UT. The OT unfiltered magnitude is 16.9m (limit 18.4m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-07-29.83873 UT with unfiltered magnitude limit 18.9m. Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/183915.11141656.4.png

MASTER OT J012016.45+301055.7 - PSN in SDSS galaxy

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 01h 20m 16.45s +30d 10m 55.7s on 2013-07-09.97456 UT. The OT unfiltered magnitude is 16.9m (limit 19.6m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2010-07-19.94009 UT with unfiltered magnitude limit 20.4m. There is galaxy SDSSJ012016.94+301049. The PSN offset are 6.4W and 6.6N arcsecs.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/012016.45301055.8.png

List of Optical Transients discovered by MASTER

Global MASTER Net