[vsnet-alert 21423] PNV J20205397+2508145: new transient (12.3 mag) in Vulpecula

[Patrick Schmeer pasc1312-aavso@yahoo.de via vsnet-alert]

PNV J20205397+2508145  (CV:)

RA 20h20m53.97s, DEC +25°08'14.5" (J2000.0)
2017 Sept. 12.5422 UT, 12.3 mag; 12.67 UT, 12.7 mag
(both CCD, unfiltered).
Discoverer: Tadashi Kojima, Gunma-ken, Japan

2017 09 12.542 UT
Discovered by T. Kojima, Gunma-ken, Japan, who found
this on three frames taken by Canon EOS 6D + 135-mm
f3.2 lens and confirmed this (mag.= 12.7) taken on
2017 Sept. 12.67 UT using 200-mm f/3.2 lens.
Nothing is visible at this location on a frame taken
on 2017 Sept. 2.719 UT. An image at
http://www.oaa.gr.jp/~oaacs/image/PNinVul2017.jpg 

Follow up-reports:
http://www.cbat.eps.harvard.edu/unconf/followups/J20205397+2508145.html

Five Gaia DR1 sources in the 18-21 mag range
are within 6 arcsec of the transient's position.
Precise astrometry, spectroscopy and time-resolved
photometry are urgently required.

Clear skies,
Patrick