[vsnet-alert 25517] ZTF21aaoiaer: a large-amplitude (>~7 mag) CV candidate

[Kenta TAGUCHI]

 From the public ZTF data, I've just found ZTF21aaoiaer out as a CV 
candidate being in a large-amplitude (> ~7 mag) outburst.
Its position is (RA, Dec) = (07:28:18.595, -04:51:5.209).
Lasair: https://lasair.roe.ac.uk/object/ZTF21aaoiaer/
Alerce: https://alerce.online/object/ZTF21aaoiaer

There are no counterpart and no detections by PS1 (limiting mag ~ 23).
No known minor planets are found by the Minor Planet Checker 
(https://www.minorplanetcenter.net/cgi-bin/checkmp.cgi).

Last non-detections by ZTF:
g > 20.5 on 2021-03-03.21 UT
r > 19.6 on 2021-03-03.29 UT

First detections by ZTF:
r = 15.6 on 2021-03-07.15
g = 15.4 on 2021-03-07.19

This is the result of ASAS-SN Sky Patrol: 
https://asas-sn.osu.edu/sky-patrol/coordinate/573a3f4d-789c-4a46-9dbb-b2574f7b2ec2
Please be careful that it has been contaminated by another star (g ~ 15) 
nearby.
However, the result says g = 14.2 on 2021-03-04.27, which is a bit 
brighter for the contaminating star.
(ZTF21aaoiaer may have already outbursted then, and the sky patrol might 
report the magnitude summing up the flux of it and its contaminating star).

Best Regards,
Kenta
________________________________________________________________
  田口 健太　(TAGUCHI, Kenta)
  京都大学大学院理学研究科宇宙物理学教室
  (Department of Astronomy, Graduate School of Science, Kyoto University)
kentagch at kusastro.kyoto-u.ac.jp <mailto:kentagch at kusastro.kyoto-u.ac.jp>
  09090536980