MAGNITUDES AND COLORS OF SN 1993J COMPARISON STARS

A catalog and finding chart with cross-identifications to other charts and catalogs, are provided for 36 comparison stars of SN 1993J within 16' from the center of M81. Revised V-band magnitudes and-where available-U-B, B- V, V-R(c), and V-I-c colors are listed for 35 stars with 9.5 less than or equal to V less than or equal to 15.5, and a fainter one (''a'') at V=17.8. For stars more than 6' from the nucleus of M81, the GSC photovisual magnitudes, m(pv), can be converted to the V system, through V-*=m(pv)+0.40+0.15(B-V), with a mean error of 0.03 mag when the color index is known and, less precisely, V-*=m(pv)+0.50+/-0.1 mag, when it is not.