Is PSN J12355230+2755559 actually a SN impostor?

American Association of Variable Star Observers (AAVSO)
Thu, 07/01/2021 - 21:33

PSN J12355230+2755559 was discovered by L. Elenin in 2012.
It was reported as a possible supernova in the faint galaxy SDSSCGB 754.2.

It was then better described as a supernova impostor, an outburst from an LBV:

Also in CBET 2976

Another similar outburst was reported in June 22, 2014:
A previous outburst is mentioned in the same ATel as having occured around February 24, 2014.
They also report SDSS J123551.86+275556.9 as the likely host galaxy.

Another outburst was detected on August 3, 2014 by Gaia.

Am I the only one not understanding why these outbursts with rather fast fadings and lasting only a few days are being interpreted as LBV outbursts?
Isn't it possible that the spectroscopic features are contaminated by the background galaxy?

In 2016, Gaia detected another similar and fast outburst:

The authors of the above ATel compared PSN J12355230+2755559 with SN 2000ch.

It is present in Pan-STARRS1 (g= 19.0; r= 19.4).
And in SDSS (g= 18.2; r= 18.1).
Gaia shows ~1 mag. variability around G= 20.

ZTF also shows rapid brightenings:

So, can it be a foreground dwarf nova? (Gaia shows a negative parallax, but I have seen completely spurious parallax when objects are embedded in nebulosity).
Can an LBV actually show these rapid large amplitude brightenings?