Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PSN J12304185+4137498

PSN J12304185+4137498   2011 08 16.8300*  12 30 41.85 +41 37 49.8  16.7 U   57E  37S  N4490     8 0

2011 08 16.8300

POSSIBLE DISCOVERY BY : CORTINI GIANCARLO AND ANTONELLINI STEFANO AT MONTE MAGGIORE OBS.- PREDAPPIO (ITALY) - C14 - STARLIGHT SXVR H9 - SEVERAL IMAGES FROM 40 T0 80 SEC. OF EXPOSURE - LIMIT. MAG. ABOUT +18.0 - OUR PRECEDENT IMAGES SHOWED NOTHING AT THE POSITION OF THE PSN , AND IT DOESN'T APPEAR ON POSS (RED AND BLUE PLATES). NO KNOWN MINOR PLANET IS MARKED IN THE POSITION OF THE PSN . BEST REGARDS.

2011 08 17.80

Transient is confirmed on a median-combined 3x60 sec unfiltered CCD frame taken with the BART telescope at Baja Observatory, Hungary by T.Borkovits and R.Szakats. Transient brightness: 17.5 mag (tied to USNO-R). The confirmation image is posted at the following URL: http://titan.physx.u-szeged.hu/~sn/psn_j12304185+4137498_bajaobs.jpg

2011 08 20.168

This possible supernova in NGC 4490 was seen with 68 x 30 sec images using a clear filter. Astrometry: RA 12 30 41.87 Dec 41 37 49.3 Photometry: Mag 16.8 +/- 0.1 C These data were collected by Joseph Brimacombe, Cairns, Australia. Link to image and further information: http://www.flickr.com/photos/43846774@N02/6062934887/