[vsnet-campaign-dn 15845] TCP J00505644+5351524: dwarf nova outburst (since July 17) with precursor

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

TCP J00505644+5351524 = GEOTS-2021-016 (UGSU:) (submitted to VSX)
Gaia EDR3 position: 00 50 56.439 +53 51 51.9 (equinox J2000.0, epoch J2016.0)
 
Discovered by Balaji Shankar Kumar (Golden Ears Observatory Transient Survey), see
http://www.cbat.eps.harvard.edu/unconf/followups/J00505644+5351524.html
https://www.wis-tns.org/object/2021tqb
 
Complete ASAS-SN Sky Patrol light curve and data:
https://asas-sn.osu.edu/sky-patrol/coordinate/2ec47098-6e9b-4d9d-bf9f-be553889a945
 
ZTF light curve, data, and images (via Lasair):
https://lasair.roe.ac.uk/object/ZTF21ablweoo/
 
The current outburst started on 2021 July 17, preceded by a precursor outburst (from July 13 to 14).
A previous (short) outburst was recorded from 2016 July 28 to 30 by ATLAS and the ASAS-SN Sky Patrol.
 
This variable looks like an SU UMa-type dwarf nova with an orbital period above the gap
(if the red source Gaia DR2 417437629669203968 is really the progenitor).
 
Time-resolved photometry is urgently required.
 
Clear skies,
Patrick
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References:
All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol:
- Shappee et al., 2014ApJ...788...48S
- Kochanek et al., 2017PASP..129j4502K
Asteroid Terrestrial-impact Last Alert System (ATLAS):
- Tonry et al., 2018PASP..130f4505T
- Heinze et al., 2018AJ....156..241H
Lasair:
- Smith et al., 2019RNAAS...3...26S
Zwicky Transient Facility (ZTF):
- Masci et al., 2019PASP..131a8003M