[vsnet-alert 25585] ASASSN-19dm likely superoutburst (since Mar. 10)

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

 ASASSN-19dm (UGSU:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=684320

Complete ASAS-SN Sky Patrol light curve and data:
https://asas-sn.osu.edu/sky-patrol/coordinate/d75524e9-26ca-4e64-b224-f5f7c3435f97

ZTF light curve, data, and images (via Lasair):
https://lasair.roe.ac.uk/object/ZTF21aapecgx/

- A long outburst (= superoutburst?) was recorded by ATLAS from
2018 January 17 to 29 (followed by a rebrightening on February 4).
(unfortunately there is a gap in ASAS-SN Sky Patrol data between
2017 December 29 and 2018 February 8)
- A very short (= normal?) outburst was recorded by the ASAS-SN Sky Patrol
and by ATLAS from 2019 February 24 to 25.
- The current (long) outburst began between 2021 March 7 and 10 -
and should be almost over.

*** 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
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     Am Dienstag, 23. März 2021, 01:18:19 MEZ hat Taichi Kato <tkato at kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  
 
 ASASSN-19dm outburst

  Subtype unknown.

  YYYYMMDD(UT)  mag  observer
  20210319.2386 16.114zr  (Zwicky Transient Facility Lasair (Masci+ 2019))
  20210321.1684 15.925zg  (Zwicky Transient Facility Lasair (Masci+ 2019))