[vsnet-chat 7848] PSN J18250198+2731537: a supernova or a different object?

[Gianluca Masi]

Dear All,

the CBAT's TOCP shows this object:

http://www.cbat.eps.harvard.edu/unconf/followups/J18250198+2731537.html

to date, a spectroscopical observation is missing.

I see that there is a NOMAD entry about 2" off in RA (with
almost coincident declination), so I was wondering if the
reported suspect is a SN or a different outbursting object.
Of course, the NOMAD entry can be a HII knot in the hosting
galaxy (or the NOMAD source astrometry can be contaminated
by a HII region), unfortunately I cannot check this in
detail right now. It looks like that there is a difference
in magnitude between the PSN and the NOMAD entry of about 6
mags.

http://www.virtualtelescope.eu/2013/04/07/possible-supernova-psn-j182501982731537-in-ngc-6632-3-apr-2013/

A few days ago, the transient was around mag. 16.2,
unfiltered:


Best
Gianluca