THE ASTRONOMER Electronic Circular No 748 1993 Jun 14 19.59UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP,England. Telephone/FAX(0256)471074 Int:+44256471074 TELEX: 9312111261 Answerback: TA G TELECOM GOLD: 10074:MIK2885 GMH at UK.AC.RUTHERFORD.STARLINK.ASTROPHYSICS STARLINK: RLSAC::GMH GMH at UK.AC.CAM.ASTRONOMY.STARLINK STARLINK: CAVAD::GMH ------------------------------------------------------------------- SUPERNOVA 1993R IN NGC 7742 R. R. Treffers, B. Leibundgut, and A. V. Filippenko, University of California at Berkeley; and M. W. Richmond, Princeton University, report the discovery of a probable supernova in NGC 7742 (R.A. = 23h41m43s, Decl. = +10 29'.3, equinox 1950.0). The object was found during the Leuschner Observatory Supernova Search (LOSS), which uses an automated 0.76-m telescope equipped with the Lawrence Berkeley Laboratory CCD camera. SN 1993R was detected in an image obtained on June 2 UT and confirmed on June 3. Inspection of earlier LOSS observations of NGC 7742 reveals the presence of this object since Feb. 15, before it disappeared behind the sun. It was not present in an image obtained on Feb. 2. The supernova is located about 8" east and 5" north of the galaxy nucleus and is estimated to be of magnitude R about 17. IAUC 5812 SUPERNOVAE 1993S AND 1993T IN ANONYMOUS GALAXIES J. Maza, University of Chile; and M. Hamuy, Cerro Tololo Interamerican Observatory, report the discovery of two apparent supernovae by R. Antezana (University of Chile) on 20-min unfiltered IIa-O plates taken by G. Valladares with the CTIO Curtis Schmidt telescope. SN 1993S (mpg about 17.5 on May 26.36 UT) is located 7".5 west and 6".5 north of the nucleus of a spiral galaxy at R.A.= 22h49m33s.4, Decl. = -40 34'40" (equinox 1950.0). Confirmation of SN 1993S was made by R. Aviles on CCD B, V, and I images obtained on June 5.36 with the CTIO 0.9-m telescope. SN 1993T (mpg about 18 on May 26.38 UT) is located about 18".5 west and 13".5 north of the nucleus of a galaxy at R.A. = 23h08m07s.7, Decl. = -45 15'21" (equinox 1950.0). Confirmation of SN 1993T was also made by Aviles from a CCD V image obtained on June 5.38. IAUC 5812 SUPERNOVA 1993J IN NGC 3031 Recently the supernova has been in a plateau phase and there is a possibility that when this ends the decline may be very sharp although given the unique nature of the light curve to date it is by no means certain what will happen next. To date over 700 visual observation have been accepted into the database and we are currently reviewing a further 200 estimates secured from either CCD or conventional photography. Additionally not a single night has been missed since the supernova's discovery. However the present flow of observations has now dropped appreciably just at a time when it is vital intensive coverage is maintained and we are alerted at the earliest possible moment to any change in activity. Please make every effort to observe the supernova on every clear night and send in results frequently.