TCP J00590972+3438357: likely a dwarf nova outburst (12.5 mag) in Andromeda

TCP J00590972+3438357 (UGWZ:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=1500041

Discovery details:
R.A. 00h59m09.72s, Decl. +34°38'35.7" (J2000.0)
2019 December 13.4309 UT, 12.4 mag (CCD, unfiltered)
Discoverer: Seiji Ueda (Kushiro, Hokkaido, Japan)

2019 12 13.412 UT
Discovered by Seiji Ueda, Kushiro, Hokkaido, Japan, who found this star on three frames (limit mag.= 14.1) taken by Canon EOS 6D digital camera + 200-mm f/3.2 lens, who writes position was measured on three frames taken 10-cm f/6.3 reflector and this star seems to be identical with a star 1246-0014421 on USNO-B1.0 (position end figures 09s.72, 36".1). Nothing is visible at this location on the frames taken on 2019 December 6 and 9 UT with same instrument.

2019 12 13.3609 UT
Other designations for the (blue) progenitor candidate USNO-B1.0 1246-0014421 are Gaia DR2 362812689406164224 (Gmag. 21.07; J2000.0 position end figures 09.728s, 35.67"), GSC2.3 NBM8004396 (Fmag. 20.46, Bjmag. 20.79), SDSS J005909.73+343835.7 (umag. 20.95, gmag. 20.95, rmag. 21.00), PSO J005909.728+343835.797 (gmag. 20.99, rmag. 21.08), GALEX J005909.7+343834 (FUVmag. 21.03, NUVmag. 20.54), and GALEX J005909.7+343836 (FUVmag 15.78, NUVmag. 15.87 – bright, in outburst?). The transient is confirmed by recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) observations: 2019 December 9.270 UT, gmag. fainter than 15.9; 13.361, gmag. 12.52. No previous outbursts (or eruptions) were recorded since 2012 February 12; complete data and light curve at https://asas-sn.osu.edu/light_curves/6a859229-5bb5-456e-82b2-0af8ef69c9…
--- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

http://www.cbat.eps.harvard.edu/unconf/followups/J00590972+3438357.html

*** Time-resolved and multiband photometry as well as spectroscopy are urgently required. ***

Clear skies,
Patrick