[vsnet-alert 23593] ASASSN-19xw - large amplitude 15m transient in Vulpecula

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

ASAS-SN team (K. Z. Stanek, C. S. Kochanek et al.) has reported this
15m object in Vulpecula to Transient Name Server on September 29th:

ASASSN-19xw = AT 2019rki
https://wis-tns.weizmann.ac.il/object/2019rki

Position (J2000.0): 19 19 00.34 +25 03 32.5
Discovery magnitude: 14.9g on 2019-09-29.23 UT

Light curve from ASAS-SN Sky Patrol (Shappee et al., 2014, Kochanek et
al., 2017):

https://asas-sn.osu.edu/light_curves/961090e0-307f-4896-9957-f91168474e08

ASASSN-19xw
  20190927.2316  >168g   ASAS-SN  Last non-detection
  20190928.2281  16.46g  ASAS-SN  First detection
  20190929.2336  14.87g  ASAS-SN
  20190929.2349  14.83g  ASAS-SN
  20190929.2361  14.80g  ASAS-SN  Maximum
  20190930.0636  15.11g  ASAS-SN
  20190930.3105  15.17g  ASAS-SN

There is nothing at this position in PanSTARRS-1 images (limiting
magnitude about 23). Outburst amplitude is at least 8 mag. Galactic
latitude is +5.5 deg. The object is either a WZ Sge-type dwarf nova or
a classical Nova. Multi-color photometry and time series are
desirable.

Denis Denisenko