Confirm GK Per outburst,

PERGK 20211003.9444 10.8 OJR star´s comparison 10.7-11.2 - AAVSO Chart X27176BO

Sincerely, José Ripero M1 Group / CAA Madrid/Spain

El dom, 3 oct 2021 a las 21:11, Patrick Schmeer via groups.io (pasc1312-aavso=yahoo.de@groups.io) escribió:

This is the ASAS-SN Sky Patrol light curve that I generated yesterday:

https://asas-sn.osu.edu/sky-patrol/coordinate/6c22a9f3-e6d0-4e19-9221-2bcf64...

The unusually bright state is obvious. Further brightening in today's data:

https://asas-sn.osu.edu/sky-patrol/coordinate/f6b66e28-d40d-480f-a202-173b86...

Let's see whether the slow rise continues.

Clear skies, Patrick

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Am Sonntag, 3. Oktober 2021, 20:42:24 MESZ hat Pavol A. Dubovsky < var@kozmos.sk> Folgendes geschrieben:

Seems not in outburst yet: PERGK 20211003.776 12.8V DPV

---

Pavol A. Dubovsky Vihorlat Observatory, Humenne, Slovakia var.kozmos.sk

On 2021-10-03 10:07, Patrick Schmeer via vsnet-alert wrote:

...

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

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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

Lasair:

• Smith et al., 2019RNAAS...3...26S

Zwicky Transient Facility (ZTF):

• Masci et al., 2019PASP..131a8003M

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