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Flare of OH maser OH 63.3 -10.2 detection by MASTER

ATel #4560; P. Podvorotny, D. Denisenko, V. Lipunov, N. Tiurina, P. Balanutsa, E. Gorbovskoy, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov, V. Echeistov (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), V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 9 Nov 2012; 09:51 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Infra-Red, Optical, Transient

MASTER OT J202857.00+211533.2 - flare of OH maser OH 63.3 -10.2

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 20h 28m 57.00s +21d 15m 33.2s on 2012-11-06.55238 UT. The OT unfiltered magnitude is 17.3m (limit 18.1m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2011-08-31.52609 UT with magnitude limit in 'R' filter 18.6m.

This OT is located within 4" from the known infrared source IRAS 20267+2105 = 2MASS J20285710+2115370 (J=8.79 H=6.31 K=4.34). The object is not listed as a variable in GCVS or AAVSO VSX. However, it is showing the variability on the 2nd epoch Palomar red plates. Namely, it was below the plate limit on 1990 Sep. 15 plate (fainter than R~20.0), but clearly visible on 1992 Aug. 31 plate (R=18.56, according to GSC 2.3.2).

We have at least 6 unfiltered MASTER-Amur images of this area on four nights in the past with the object not seen to the limiting magnitude 17.5-18.0. We suggest that OH 63.3 -10.2 is currently in active phase. Follow up observations in optical and IR bands are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/202857.00211533.2_1.png

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