GK Persei (NA+UG+NLDQ) Orbital period: 1.996803 d White dwarf spin period: 0.0040625 d = 5.85 min = 351 s https://www.aavso.org/vsx/index.php?view=detail.top&oid=25717
Beginning of the brightening noticed yesterday during my regular check of ASAS-SN Sky Patrol data. https://asas-sn.osu.edu/sky-patrol/coordinate/485c8c41-e472-4da9-ab5c-c42c04...
I then checked the latest AAVSO data, but the latest observation was (and still is) from 2021 Sept. 30.935 UT: https://app.aavso.org/webobs/results/?star=000-BBG-044
No visual confirmation by me due to bad weather last night.
The latest ZTF observation is from 2021 Sept. 14.384 UT: https://lasair.roe.ac.uk/object/ZTF18abnzukj/
The beginning outburst was also noted by Y. Maeda (Oct. 2.613 UT, mag. 126cG; see vsnet-outburst 27777).
The previous dwarf nova outburst of GK Per was observed from 2018 August 23 to October 28 (optical peak on Sept. 24, V= 10.1).
Follow-up observations (e.g. spectroscopy) are encouraged.
Clear skies, Patrick ------- References: All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol: - Shappee et al., 2014ApJ...788...48S - Kochanek et al., 2017PASP..129j4502K Lasair: - Smith et al., 2019RNAAS...3...26S Zwicky Transient Facility (ZTF): - Masci et al., 2019PASP..131a8003M