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Optical Nova Candidate in M81

ATel #3735; K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), A. F. Valeev, A. N. Sarkisyan, O. N. Sholukhova, S. N. Fabrika (Special Astrophysical Observatory, Russia), J. Gorosabel (IAA-CSIC, Spain), and P. Kubanek (IAA-CSIC/U, Valencia, Spain)
on 4 Nov 2011; 20:34 UT
Credential Certification: Sergei Fabrika (fabrika@sao.ru)

Subjects: Optical, Nova, Variables

Referred to by ATel #: 3770, 3871, 3888, 4181

We report the discovery and photometric observations of the M81 nova candidate designated PNV J09553266+6906072. The transient was discovered by K. Hornoch on co-added 4320-sec unfiltered CCD frame taken by himself using the 0.65-m telescope at Ondrejov on 2011 Nov. 1.142 UT. The new object is located at R.A. = 9h55m32s.66, Decl. = +69o06'07".2 (equinox 2000.0), which is 2.7" west and 132.1" north of the center of M81. The object was confirmed on BVR images taken with the Russian 6-m BTA telescope equipped with the SCORPIO spectral camera. We measured following magnitudes of the PNV J09553266+6906072: 2011 Oct. 11.196 UT, [21.8 (J. Gorosabel and P. Kubanek, 1.23-m telescope at Calar Alto, R-band); Nov. 1.142, 20.5 +/- 0.2 (0.65-m telescope at Ondrejov, unfiltered, using R-band magnitudes from comparison stars); 4.118, R = 19.7 +/- 0.1 (6-m BTA); 4.120, B = 20.7 +/- 0.1 (6-m BTA); 4.167, V = 20.0 +/- 0.1 (6-m BTA). A finding chart of the PNV J09553266+6906072 (north is to upper left) is posted at URL http://www.asu.cas.cz/~asteroid/PNV_J09553266+6906072-finding.png . Spectroscopic confirmation/classification is encouraged.