[vsnet-alert 22833] SDSS J014823.30-004807.5 bright outburst

[Denis Denisenko d.v.denisenko@gmail.com via vsnet-alert]

The blue star in SDSS stripe 82 is in bright outburst by ~6 mag.

SDSS J014823.30-004807.5
u=20.43(7) g=20.21(2) r=20.29(3) i=20.40(4) z=20.23(13)

Discovered by Ground Wide Angle Cameras (GWAC) on 2018-12-11 at 12:34:53 UT
as GWAC 181211A (TNS name: AT 2018jsm) and by ASAS-SN as ASASSN-18abn.

SDSS J014823.30-004807.5
  20181130.543  <165C  GWAC (X. Han et al.)
  20181211.19   16.9g  ASAS-SN (Shappee et al., 2014; Kochanek et al., 2017)
  20181211.524  13.7C  GWAC (X. Han et al.)
  20181213.15   14.4g  ASAS-SN (Shappee et al., 2014; Kochanek et al., 2017)

https://wis-tns.weizmann.ac.il/object/2018jsm
http://www.astronomy.ohio-state.edu/~assassin/transients.html

Gaia DR2 parallax: 2.223+/-1.637 mas (formal distance modulus m-M=8.3)
Gmag=20.54(1) BPmag=20.32(12) RPmag=19.72(17)
pmRA=21.9+/-1.5 mas/yr pmDE=8.95+/-1.83 mas/yr

Located 16.6" from radiogalaxy PGC 144345 (14.5" east, 8" north).
UV source GALEX J014823.2-004807 (FUV=22.61+/-0.46 NUV=21.60+/-0.26)
Pan-STARRS: g=20.44(3) r=20.456(2) i=20.52(3) z=20.51(9) y=20.04(10)

Good candidate for SU UMa or AM CVn-type dwarf nova. Time resolved
photometry is encouraged.

Denis Denisenko