Supernova 1999gs in NGC 4725
Abstract
W. D. Li, University of California at Berkeley, on behalf of the Lick Observatory Supernova Search (cf. IAUC 6627, 7126), report the discovery with the 0.8-m Katzman Automatic Imaging Telescope (KAIT) of an apparent supernova in NGC 4725. The new object was discovered at mag about 19.3 on an unfiltered image (limiting mag about 19.5) taken on 1999 Dec. 28.5 UT, and it was confirmed on a 5-min unfiltered image (limiting mag about 21.0) taken on Dec. 30.5. SN 1999gs is located in the southern spiral arm of the galaxy at R.A. = 12h50m26s.28, Decl. = +25o28'16".5 (equinox 2000.0), which is 3" west and 105" south of the nucleus of NGC 4725. Another observation obtained on 2000 Jan. 13.5 showed the new object still at mag about 19.5 (limiting mag 20.5). A template image of NGC 4725, made by combining several observations of the field before 1999 June 7, showed nothing at the position of SN 1999gs (limiting mag about 20.5). The discovery images can be found at http://astron.berkeley.edu/~bait/1999/ngc4725.html. LOSS has not observed this galaxy for about half a year, so SN 1999gs must be a very old supernova.
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- January 2000
- Bibcode:
- 2000IAUC.7345....2L