Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PSN J11532132+2044100

PSN J11532132+2044100   2013 01 05.43  *  11 53 21.32 +20 44 10.0  16.0 U   14E   4N  N3947     D 0

2013 01 04.1792

Simone Leonini, Siena, Italy, report the pre-discovery by S. Leonini, P. Rosi and L.M. Tinjaca Ramirez of a PSN in NGC3947 (mag. about +15.5CR +/- 0.25 – USNO B1) on unfiltered CCD image (limiting mag. about +18.5) taken on 2013 January 04.1792 UT at the Montarrenti Observatory(C88) in the course of an automatic survey of the Italian Supernovae Search Project. Telescope/Detector: RC 0.53m f/8.7 + U47; Astrometry: R.A. 11h53m21.40s, Decl.+20degrees45arcmin07.9arcsec. +/- 0.13 - equinox 2000.0); Offset: 14arcsec E, 4arcsec S. Nothing is visible at this position on POSS images and our past images including one on 2012 December 12 (limiting mag. about +18.5). No known minor planets are marked in that position for the time of our observation. Pre-discovery image: http://www.astrofilisenesi.it/public/Sne/Uploads/pre-discovery_psn_in_NGC3947.jpg

2013 01 08.17548

This object was observed by Federica Luppi and Luca Buzzi from Schiaparelli Observatory, Varese, Italy. In a stack of images totalling 5 minutes of unfiltered exposure time, the object has position end figures 21s.40, 07".8 and magnitude 15.8. Image posted at URL:http://www.astrogeo.va.it/pub/TOCP/PSN_N3947.jpg

2013 01 09.399

This possible supernova in NGC 3947 was detected with 52 x 0.5 min images using a luminance filter Astrometry: RA 11 53 21.41 Dec +20 45 07.9 Photometry: 15.56 +/- 0.17 L (V as ref) These data were collected remotely by Joseph Brimacombe, Cairns, Australia. Link to image and further information http://www.flickr.com/photos/43846774@N02/8368274029/