Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PSN J23274086+2335214

PSN J23274086+2335214   2014 08 09.517 *  23 27 40.86 +23 35 21.4  17.0 U    3W   1N  N7673     L 0

2014 08 08.426

The target was not detected just one night before with limiting mag of ~17.5 after subtraction in KAIT image. This indicates that the target is probably young if it is real (considering it is only detected once).

2014 08 09.9663

This transient was observed on 2014 08 09.9663 by G. Masi, P. Catalano and P. Schmeer, remotely using the 17"-f/6.8 robotic unit part of the Virtual Telescope Project facility, at Bellatrix Astronomical Observatory in Ceccano, Italy. 120-seconds exposures, unfiltered, show a possible source, like a denser knot, where reported in the original discovery claim. The source is strongly embedded in the galaxy light, with a mag. around 16.5/17.0 (R mags for the reference stars from UCAC-4). We also performed astrometry, getting the following end figures: 40.82; 21.3 (J2000.0, mean residuals of 0.2" on both axes). An image is available here http://www.virtualtelescope.eu/psnPSNJ23274086+2335214.jpg

2014 08 11.369

KAIT image shows that the target has brightened for about 0.6 mag in two days, supporting that this is a very young SN candidate. Spectroscopic observations are encouraged.

2014 08 12.9147

This transient was observed again on 2014 08 12.9147 by G. Masi, P. Catalano and P. Schmeer, remotely using the 14"-f/8.7 robotic unit part of the Virtual Telescope Project facility, at Bellatrix Astronomical Observatory in Ceccano, Italy. 120-seconds exposures, unfiltered, show the source much better than on 9.966 Aug., around mag. 16.0 (R mags for the reference stars from UCAC-4). We also performed astrometry, getting the following end figures: 40.86; 21.3 (J2000.0, mean residuals of 0.2" on both axes).

2014 08 18.02

A. Klotz (IRAP/CNRS, France), reports the sprectral observation of PSN J23274086+2335214 using the 94 cm telescope located at Saint-Caprais (France). The spectrum is 10 min exposure using an Alpy 600 spectrometer obtained at 2014 Aug. 18.02. H-beta, [OIII]-5007 and H-alpha lines are seen in emission at a redshift z = 0.01148 +/- 0.0015 which is compatible with the redshift of NGC 7673 (z = 0.011368 according to NED). The feet of H-beta and H-Alpha lines are spreader than that of [OIII]. The broad Balmer component and the absence of blue absorption of the Balmer lines suggests a typical young SN II supernova. More details available here http://cador.obs-hp.fr/sn_tarot/PSN_J23274086+2335214