[vsnet-campaign-dn 15368] ASASSN-21br: rapid fading, might also be an AM CVn star

[Taichi Kato]

ASASSN-21br: rapid fading, might also be an AM CVn star

   Josch Hambsch recorded this object at 16.8 mag
on Feb. 17.  Nearly 3 mag fading in one day.

  YYYYMMDD(UT)   mag  observer
  20210212.319  <171g  (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017))
  20210213.310  137g  (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017))
  20210214.390  138g  (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017))
  20210216.653   139  (Rod Stubbings)
  20210217.623  <150  (Rod Stubbings)

   This object might also be an AM CVn-type outburst
just like ZTF20acyxwzf = ASASSN-21au.  If this is
the case, the object would brighten again.
Intensive time-resolved photometry is encouraged
(the orbital period is short if it is an AM CVn star).