COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 655 Konkoly Observatory Budapest 1972 April 6 THE SUPERNOVA SERVICE OF THE BYURAKAN ASTROPHYSICAL OBSERVATORY The supernova service at the Byurakan Observatory was commenced in 1966. The observations are carried out with the 21" Schmidt telescope having a field of 25 square degrees. ORWO ZU-2 films were used with standard exposure time of 30 minutes reaching magnitude 18.0. In the Table overleaf the following data are given for 26 patrolling areas: the coordinates RA, D (1950) of the centres of the areas (columns 2 and 3); n - number of observational nights, t - net exposure time in hours and minutes for each year separately (4-15); n - number of observational nights, t - net exposure time for all years together (16-17); the net exposure time expressed in fractions of a day (18). It is necessary to stress that the telescope has been used for the supernova program not regularly because of its employment for other programs. R.G. MNATSAKANIAN Byurakan Astrophysical Observatory No RA 1950 D 1950 1966 1967 1968 1969 1970 1971 n t n t n t n t n t n t n t t 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 1h 18 + 0d 57' 2 1h 00m 1 0h 40m 2 0h 40m 1 0h 30m 2 1h 00m - 8 3h 50m 0.1597 2 2 22 +32 06 1 0 30 1 0 50 1 0 20 5 2 00 1 0 30 - 9 4 10 0.1736 3 2 35 + 0 15 4 2 10 - - 3 1 40 - - 7 3 50 0.1597 4 2 35 - 8 46 1 0 30 1 0 28 - 3 1 10 - - 5 2 08 0.0889 5 2 40 +37 06 - - - 3 0 31 6 2 45 - 9 3 16 0.1361 6 3 02 +42 30 1 0 30 2 1 19 - 1 0 10 1 0 30 - 5 2 20 0.0972 7 3 42 +68 00 - 2 1 00 - 7 3 10 1 0 30 - 10 3 40 0.1528 8 5 14 +68 00 - 2 1 00 - 5 2 20 2 1 00 - 9 4 20 0.1806 9 7 11 +86 00 - - - 5 2 40 3 1 30 - 8 4 10 0.1736 10 7 30 +79 53 - - - 4 2 17 - - 4 2 17 0.0951 11 7 37 +66 00 - - - 4 2 12 - - 4 2 12 0.0917 12 9 17 +50 22 - 3 2 04 1 0 30 2 1 00 1 0 30 - 7 4 04 0.1694 13 10 16 +43 45 - - - 1 0 30 1 0 30 3 1 25 5 2 27 0.1021 14 11 27 +54 45 1 0 30 2 1 00 - 3 0 50 - 2 1 00 8 3 20 0.1389 15 11 56 +43 00 - 1 0 30 - 2 1 00 3 1 30 - 6 3 00 0.1250 16 11 56 +53 06 - - - 2 0 53 4 1 29 2 1 00 8 3 22 0.1403 17 12 00 +52 30 5 3 00 3 1 30 - 3 1 11 - - 11 5 41 0.2368 18 12 14 +40 00 - - - 2 1 00 1 0 30 4 1 47 7 3 17 0.1368 19 12 23 +14 49 - 1 0 06 - - 4 1 56 1 0 40 6 2 42 0.1125 20 12 25 +04 44 - - - - 2 1 00 1 0 30 3 1 30 0.0625 21 13 10 +37 05 - - - 2 1 00 2 1 00 6 3 08 10 5 08 0.2539 22 13 34 +12 00 - - - - 2 1 00 - 2 1 00 0.0417 23 14 03 +54 30 2 1 00 3 1 45 - 6 2 45 9 1 28 4 1 50 24 8 48 0.3667 24 14 31 +54 30 2 1 00 3 1 45 - 5 3 00 4 1 53 6 3 00 15 8 53 0.3701 25 15 06 +55 00 1 0 30 - - 7 4 00 6 2 54 4 2 00 18 9 24 0.3917 26 23 00 +14 00 - 1 0 40 - 5 2 30 4 2 00 1 0 30 11 5 40 0.2361