Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PSN J13443367+0446535

PSN J13443367+0446535   2015 04 09.89  *  13 44 33.67 +04 46 53.5  17.8 U    5W  22N  U8690     9 1

2015 04 09.89

F. Ciabattari, E. Mazzoni and S. Donati report the discovery of an apparent supernova (unfiltered magnitude = 17.8) on images (limiting magnitude 19.5) obtained on April 09.89 UT and April 10.81 UT with a 0.5m Newtonian telescope + CCD FLI Proline 4710 camera at Borgo a Mozzano - Italy, in the course of the Italian Supernovae Search Project. The new object is located at A.R. = 13h44m33s.67, Decl. = +04°46'53".5 (equinox 2000.0, astrometry with respect to UCAC-2 stars) which is 5 arcsec west and 22 arcsec north of the centre of Galaxy UGC 8690.

2015 04 12.05970

This transient was observed on 2015 04 12.05970 by M.Caimmi (C92 Valdicerro Observatory) in the course of the Italian Supernovae Search Project (ISSP) using 0.24-m f/6.5 SCT - CCD Atik 314L. Stack of 30 unfiltered b2x2 frames x 30 sec unguided exposures show the source at 18.6 mag. End figures for astrometry were AR. 33,69s DEC. 52,4" position measured from reference stars UCAC-4 catalogue. The image of this observation is available http://www.oav.name/public/PSN_J13443367+0446535_20150412.jpg

2015 04 11.97411

This transient was observed on 2015 04 11.97411 by R. Furgoni and A. Righelli (San Benedetto Po Astronomical Observatory MPC 434) using a 0.4m f5.5 Ritchey-Chrétien equipped with a FLI-ML1603 CCD. A stack of 3 image (180-sec exposures bin 2X2) show the source at mag 18.1 (R mags from UCAC4 reference star). Astrometry end figures were AR 33.70s and DEC 52.4” (J2000.0, mean residual 0.10” on both axes, UCAC4 catalog). Image available at https://astrofilimantovani.files.wordpress.com/2015/04/psn-j134433670446535.jpg

2015 04 12.85043

This transient was observed on 2015 04 12.85043 by G. Masi and P. Catalano, remotely using the 17"-f/6.8 robotic unit part of the Virtual Telescope Project facility, at Bellatrix Astronomical Observatory in Ceccano, Italy. 180-seconds exposures, unfiltered, show the source at mag. 17.9 (R mags for the reference stars from UCAC-4). We also performed astrometry, getting the following end figures: 33.70; 52.9 (J2000.0, mean residuals of 0.1" on both axes).

2015 04 09.0069

Fabio Briganti report the pre-discovery of this supernova on image obtained on April 09.0069 UT with a 0,28m C11 telescope + CCD SBIG-ST8 at Cortina d'ampezzo - Italy, in the course of the Italian Supernovae Search Project. The object is barely visible to the limit instrumental at magnitude around +18.