[vsnet-outburst 27100] ASASSN-21gk: new transient (mag. 13) in Sagittarius

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

ASASSN-21gk
https://www.aavso.org/vsx/index.php?view=detail.top&oid=2217877

Kris Stanek (ASAS-SN) points out that ASASSN-21gk may be a "weird CV":
https://asas-sn.osu.edu/sky-patrol/coordinate/3a8f1983-d90c-4df9-9559-3f36e8923391
 
Complete ASAS-SN Sky Patrol light curve and data:
https://asas-sn.osu.edu/sky-patrol/coordinate/7461c3a2-39d5-4145-acb1-1179efb1b853
 
According to ATLAS data the 'orange magnitude' was 12.67 from 2021 April 17.489
to 17.518 UT, whereas in the years before it had been 13.1-13.2.
 
AAVSO data (currently 65 observations from *one* observer):
https://app.aavso.org/webobs/results/?star=ASASSN-21gk
 
Follow-up observations are urgently required (spectroscopy in particular).
 
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