[vsnet-newvar 8108] NSV 3240 likely superoutburst (since Mar. 9)

Sun Mar 14 05:01:20 JST 2021

 NSV 3240 (UGSU:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=41864

Complete ASAS-SN Sky Patrol light curve and data:
https://asas-sn.osu.edu/sky-patrol/coordinate/047e9ce8-804b-412c-8d84-7512391d3302

ZTF light curve, data, and images (via Lasair):
https://lasair.roe.ac.uk/object/ZTF17aabziqr/

The previous long outburst (superoutburst?) of NSV 3240 was
recorded from 2019 November 8 to 20. All outbursts recorded since
then (found by me in ASAS-SN Sky Patrol, ATLAS, and ZTF data):
2019 Dec. 29-31 (short)
2020 Feb. 2-4 (short)
2020 Mar. 29
2020 Nov. 22-24 (short)
2021 Jan. 14-16 (short)
2021 Mar. 9- (long)
The duration of long outbursts of NSV 3240 is almost two weeks,
whereas short outbursts last only about three days. These are
the typical durations of superoutbursts and normal outbursts in
(standard) SU UMa-type dwarf novae.

Time-resolved photometry during the current outburst is 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 Samstag, 13. März 2021, 07:23:31 MEZ hat Taichi Kato <tkato at kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  

 NSV 3240 outburst

http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21bgy/
Gaia21bgy    AT2021fff    2021-03-09 18:48:36    103.05559    30.95616    15.59    19.80    0.30    CV    2021-03-10 10:20:03    outburst in known CV NSV 3240

  Long and short outbursts in the ZTF data.
Possible SU UMa star.

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