Аннотация:On June 1, 2011, a sequence of unfiltered images of M51 was obtained with the 192-mm telescope (hereafter C19), equipped with an FLI PL16803 CCD camera, at Crimean Observatory of the Sternberg Astronomical Institute (SAI). 53 frames were obtained in the 19:25-20:31 UT time interval. 5 days later we started regular monitoring of SN 2011dh and continued observations till 2012 April 4. CCD images in the Johnson-Cousins bands were obtained with the following instruments: the 15-cm and 60-cm telescopes of the Astronomical Institute of Slovak Academy of Sciences at Tatranska Lomnica (S15, S60), equipped, respectively, with SBIG ST-10XME and Princeton Instruments VersArray F512 CCD cameras; the 60-cm reflector of the SAI Crimean Observatory (C60) with an Apogee AP-47p camera; the 70-cm SAI reflector in Moscow (M70) with an Apogee AP-7p camera; the 60-cm reflector of Simeiz Observatory (K60) with a VersArray F512 camera; and the 1-m reflector of Simeiz Observatory, equipped either with VersArray F512 or with VersArray B1300 cameras (K100a, K100b).
(1 data file).