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Three PSN detected by MASTER

ATel #4509; S. Shurpakov, P. Balanutsa, D. Denisenko, P. Podvorotny, E. Gorbovskoy, V. Lipunov, 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), V. Shumkov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 22 Oct 2012; 11:29 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Supernovae

MASTER OT J023052.04+222845.9 - PSN

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 02h 30m 52.04s +22d 28m 45.9s on 2012-10-20.74223 UT. The OT unfiltered magnitude is 16.7m (limit 18.9m). The OT is seen in 2 images. There is no minor planet at this place. There are three SDSS galaxies J023051.42+222839.2, J023052.08+222832 and J023052.08+222832.3 with 10.9, 13.5 and 13.6 arcsec offsets correspondingly. We have reference image without OT on 2011-09-06.72325 UT with magnitude limit in 'V' filter 18.8m. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/023052.04222845.9.png

MASTER OT J060401.40+482508.9 - PSN

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 06h 04m 01.40s +48d 25m 08.9s on 2012-10-19.76872 UT. The OT unfiltered magnitude is 17.4m (limit 18.7m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-08-21.75833 UT with unfiltered magnitude limit 18.7m. The object was present on the MASTER-Amur images taken on 2012 Sep. 30, but it was fainter than the limit required for the automatic transient detection. The following magnitudes (unfiltered with the red zero point) are reported:

2012-09-30 15:24:34.942 17.44+/-0.24
2012-09-30 16:09:51.191 17.98+/-0.29
2012-10-19 17:42:39.644 17.82+/-0.22
2012-10-19 18:26:57.752 17.40+/-0.17

There is nothing at this position in USNO-B1.0, GSC 2.3.2, 2MASS, 1RXS and GCVS catalogs as well as in AAVSO VSX. However, there is a faint object at the limit of digitized Palomar plates (~21m) which appears diffuse. Color combined (BRIR) image is posted at http://master.sai.msu.ru/static/OT/J060401+482508-BRIR-5x5.jpg (5'x5' FOV). There is nothing at this position on 3 NEAT images obtained on 2001 Dec. 23. This area is not covered by SDSS, GALEX and CSS.

The nearest catalogued object is the non-star object N21100214639 in the GSC 2.2 catalogue with 18.6 arcsec offset. But OT as a supernova can not belong to this possible galaxy because of the large distance for massive star progenitor. On the other hand, this OT can not be SN Ia because of the constant brightness during ~ 20 days. The OT can be a luminous SN in the faint host galaxy or a CV in the prolonged high state.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/060401.40482508.9.png

MASTER OT J020108.88+504815.6 - PSN

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 02h 01m 08.88s +50d 48m 15.6s on 2012-10-21.57875 UT. The OT unfiltered magnitude is 17.8m (limit 18.6m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-10-10.66506 UT with unfiltered magnitude limit 19.0m.

There is nothing at this position in USNO-B1.0, GSC 2.3.2, 2MASS, 1RXS and GCVS catalogs. There is a faint diffuse object at the limit of digitized Palomar plates (~21m).

Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/020108.88504815.6.png

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