[vsnet-alert 23371] MASTER OT J210622.20+252120.4 superoutburst (May 13-23) with precursor (May 9)

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

MASTER OT J210622.20+252120.4  (UGSU:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=359744

Complete ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S
and Kochanek et al. 2017PASP..129j4502K) data and light curve:
https://asas-sn.osu.edu/light_curves/22dda28c-680f-4a45-88cc-b489bdeccedd

The mean interval between superoutbursts seems to be ~320 days.

Quote from vsnet-outburst 23698 (Yutaka Maeda, 2019 May 12):
"MASTER_OT_J210622.20+252120.4 20190510.79727 157c Mdy.VSOLJ"
http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-outburst/23698

Quote from vsnet-alert 22351 (Taichi Kato, 2018 July 30):
"MASTER OT J210622.20+252120.4 long outburst
Past long outbursts resemble superoutbursts."
http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/22351

Time-resolved photometry during the May 2019 superoutburst
would have been strongly recommended.

Regards,
Patrick