[vsnet-alert 17819] Minus one PSN, plus one CV

[Denis Denisenko]

Vladislav Shumkov (discoverer of 20 SNe and 16 CVs in MASTER data) has
found a transient in MASTER-Tunka observations on 2014 Oct. 03 which
is identical to Pan-STARRS object PS1-13eet discovered on
2013-11-27.604 UT at 18.2m. It is listed in Bright Supernovae pages by
David Bishop as an object of unknown type. Looks like the spectrum was
not obtained in 2013.

The new outburst has been reported in ATel #6544 (V. Shumkov et al.),
see http://www.astronomerstelegram.org/?read=6544

MASTER OT J031145.65+440919.6
  20141003.815   178C  MASTER-Tunka
  20141003.818   178C  MASTER-Tunka

Checking MASTER database we found that the 2013 outburst was short,
consistent with a dwarf nova rather than a supernova.

PS1-13eet = MASTER OT J031145.65+440919.6
  20131110.685  <187C  MASTER-Kislovodsk
  20131127.604   182C  Pan-STARRS
  20131207.648  <190C  MASTER-Tunka

Moreover, it looks like another outburst was caught on Palomar
infrared plate from 1994-11-30 with Nmag=17.90 in GSC 2.3.2. The
quiescent magnitudes in SDSS (with errors) are as follows:
SDSS J031145.76+440919.8 u=22.95(24) g=23.25(16) r=23.13(19)
i=22.47(16) z=22.03(34)

Thus, the object can be added to AAVSO VSX as a cataclysmic variable
and to the lists of supernova impostors (variable stars near the
galaxies). The offset from the nearest galaxy SDSS J031143.06+440913.8
is 29"E 6"N.

Denis Denisenko
Member of MASTER team at SAI MSU