====================================================================== Computer-readable version of General Catalogue of Variable Stars, Vol.V. Extragalactic Variable Stars. III. STRUCTURE OF THE CATALOGUE OF EXTRAGALACTIC SUPERNOVAE (Files : sn_cat, sn_rem, sn_ref) -------------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- sn.txt 80 158 Extragalactic supernovae. Description sn_cat.dat 123 984 Extragalactic supernovae. Catalogue sn_rem.dat 80 278 Extragalactic supernovae. Remarks sn_ref.dat 158 674 Extragalactic supernovae. References -------------------------------------------------------------------------------- The total number of objects in the Catalogue of extragalactic supernovae is 984. We have compiled the Catalogue of extragalactic supernovae using the GCVS card catalogue. We paid attention mainly to positional and photometric information on stars themselves. The catalogue includes supernovae that appeared before the end of 1993. To improve information on parent galaxies, we used in some cases a computer version of the Third Reference Catalogue of Bright Galaxies by G. de Vaucouleurs, A. de Vaucouleurs, H.G. Corwin, Jr., R.J. Buta, G. Paturel, P. Fouque, 1991, New York: Springer and the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, Caltech, under contract with the National Aeronautics and Space Administration. The catalogue is arranged in chronological order of the SN designations. Table 3. Byte-per-byte description of file sn_cat.dat: -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 6 A6 --- SN Supernova designation 7 A1 --- n_SN [-?] Doubtful (?), or rejected (-) SN 8 A1 --- RemFlag [*] The '*' indicates a remark in sn_rem.dat 10- 19 A10 --- Gal Parent galaxy designation 21- 22 I2 h RAh Right Ascension 1950 of Parent galaxy 23- 24 I2 min RAm Right Ascension 1950 (minutes) 25- 28 F4.1 s RAs Right Ascension 1950 (seconds) 29 A1 --- DE- Declination 1950 (sign) 30- 31 I2 deg DEd Declination 1950 of Parent galaxy 32- 33 I2 arcmin DEm Declination 1950 (minutes) 34- 35 I2 arcsec DEs Declination 1950 (seconds) 36 A1 --- u_DEs [":'] Accuracy flags 37- 42 A6 --- MType Type of the parent galaxy 43- 47 F5.2 mag BT Integrated magnitude of parent galaxy 48 A1 --- u_BT Uncertainty flag (:) on BT 49 A1 --- n_BT [BJV] Band indicator, blank for photographic 51- 58 A8 --- maxDate Date of the SN's maximum or of discovery 60- 64 F5.2 mag magMax Magnitude at maximum (light) of SN 65 A1 --- u_magMax Uncertainty flag (:) on magMax 66 A1 --- n_magMax [BJVRIKr] Band indicator, blank for photographic 67 A1 --- f_magMax [*] '*' if maximum not observed 69- 71 I3 arcsec dRA Distance of SN from galaxy nucleus 72- 73 A2 arcsec oRA [NSEW:? ] Orientation of dRA 74- 76 I3 arcsec dDE Distance of SN from galaxy nucleus 77- 78 A2 arcsec oDE [NSEW:? ] Orientation of dDE 79- 80 I2 h RAhSN Right Ascension 1950 of SN 81- 82 I2 min RAmSN Right Ascension 1950 (minutes) 83- 86 F4.1 s RAsSN Right Ascension 1950 (seconds) 87 A1 --- DE-SN Declination 1950 (sign) 88- 89 I2 deg DEdSN Declination 1950 of SN 90- 91 I2 arcmin DEmSN Declination 1950 (minutes) 92- 93 I2 arcsec DEsSN Declination 1950 (seconds) 94 A1 --- u_DEsSN [":'] accuracy flags on SN position 95-100 A6 --- SNType SN classification 102-117 A16 --- Discov Name of the SN discoverer 118-120 A3 --- snRef1 Reference for study of the star, see file sn_ref.dat 121-123 A3 --- snRef2 Reference for chart or photograph, see file sn_ref.dat -------------------------------------------------------------------------------- THE SUPERNOVA'S DESIGNATION followed by a question mark (?) refers to doubtful or insufficiently confirmed supernovae. Sign (-) marks objects presently rejected as supernovae. If an asterisk (*) follows the designation, there is a remark for this object. Remarks (see file sn_rem) indicate other cases of supernova outbursts in the same galaxy, contain descriptions of behavior for some stars, etc. For supernovae entering also our catalogue of extragalactic variables, there may be a reference to Remarks of the catalogue of extragalactic variables (see file evs_rem). PARENT GALAXY'S DESIGNATION. Here "N" means NGC catalogue numbers, "I" refers to the IC catalogue, "U", to the UGC catalogue, "M", to the MCG catalogue, and "E", to ESO survey lists. The symbol "An" means an anonymous galaxy (i.e., a galaxy absent in major catalogues of bright galaxies), and the symbol "Intergal" is for cases when the supernova cannot be reliably attributed to a particular galaxy and is considered intergalactic. EQUATORIAL CO-ORDINATES OF THE PARENT GALAXY (EQUINOX 1950.0) are given. The standard accuracy of presented coordinates is to 0.1 s in right ascension and to 1" in declination, but in many cases we had to give coordinates of lower accuracy. In such cases, the column following the coordinates contains a flag similar to those described above, in the section devoted to the Catalogue of extragalactic variables. GALAXY'S MORPHOLOGICAL TYPE and its INTEGRATED MAGNITUDE taken from available sources. The integrated magnitude may be followed by a symbol indicating the photometric band (MAGNITUDE CODE); we preferred B magnitudes. If the photometric system symbol is missing, the magnitude is a photographic one. MAXIMUM MAGNITUDE (LIGHT) OF SN - the supernova's maximum brightness date and its apparent magnitude in maximum. If a value is followed by an asterisk (*), it means that the date and/or the magnitude refer not to the maximum (not covered with observations), but to the EPOCH OF DISCOVERY or to an isolated observation at high brightness. As a rule, we did not include information about maxima if it was based on considerable extrapolation. Lack of photometric band symbol (MAGNITUDE CODE) indicates photographic magnitudes. If the magnitude is given with two digits after the decimal point, it is based on photoelectric or CCD photometry. The positional information on the supernova itself follows. It consists in the DISTANCE FROM THE GALAXY'S NUCLEUS TO THE SUPERNOVA in right ascension and declination, in arcseconds, or immediately in the SUPERNOVA'S EQUATORIAL CO-ORDINATES FOR THE EQUINOX 1950.0. The standard accuracy of equatorial co-ordinates is the same as in the case of parent galaxies. For a number of supernovae, information on rectangular and on equatorial co-ordinates is not in complete agreement if we take into account published co-ordinates of parent galaxies. To remove such contradictions completely, it would be necessary to determine anew and independently the co-ordinates for supernovae and their parent galaxies. The equatorial coordinates may also have lower accuracy flags (see above). SUPERNOVA'S CLASSIFICATION - The system of classification for supernovae is being permanently improved; however, we are not able to extend the application of some recently introduced and already frequently used types, like I-C, to supernovae discovered in earlier years. So we have limited ourselves to the use of types I (I-A, I-B) and II (II-l, II-pl), with possible indications of peculiarities (pec). NAME OF THE SUPERNOVA'S DISCOVERER is given next. In cases of several discoverers, we give the name of the first author of the discovery followed by "+" symbol. As a rule, we did not present information on independent rediscoveries in the remarks, for the sake of brevity. The abbreviation "BASST" in this column means that the supernova was discovered by the Berkeley Automated Supernova Search Team. BIBLIOGRAPHIC REFERENCES - three-digit numbers corresponding to the reference list (sn_ref). The first reference is usually to the source of photometric information. The second one is to a paper where the galaxy's photograph with the supernova or a finding chart was published.