[vsnet-campaign-dn 15841] ASASSN-21lg superoutburst (since June 13): rebrightening on July 11

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

ASASSN-21lg  (UGSU)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=2223206

Recent ASAS-SN Sky Patrol light curve and data:
https://asas-sn.osu.edu/sky-patrol/coordinate/2d740dce-a767-4f3c-8d7e-ad79442ca1d4

ZTF light curve, data, and images (via Lasair):
https://lasair.roe.ac.uk/object/ZTF21abhrevv/

Gaia Photometric Science Alerts (light curve and data):
http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21dgm/
ASASSN-21lg 20210615.6358 12.75G Gaia
ASASSN-21lg 20210713.0598 18.29G Gaia
ASASSN-21lg 20210713.1338 18.15G Gaia

Some previous VSNET messages:
http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/25995
http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/26004

The superoutburst started on June 13 or shortly before.
A rapid fading occurred on July 3 and a rebrightening on July 11.
The main superoutburst lasted (at least) 20 days, i.e. about 6
days longer than a standard UGSU superoutburst.
 
Follow-up observations (at least snapshots) 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
Asteroid Terrestrial-impact Last Alert System (ATLAS):
- Tonry et al., 2018PASP..130f4505T
Lasair:
- Smith et al., 2019RNAAS...3...26S
Zwicky Transient Facility (ZTF):
- Masci et al., 2019PASP..131a8003M
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Am Mittwoch, 23. Juni 2021, 07:02:16 MESZ hat Taichi Kato Folgendes geschrieben:

ASASSN-21lg superhump period

Sano-san, Kiyota-san and Itoh-san have reported
observations.  The superhump period is 0.06058(5) d
with a mean amplitude of 0.14 mag.