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Swift X-ray detection of PNV J06270375+3952504, a candidate WZ Sge-type dwarf nova

ATel #4954; Kirill V. Sokolovsky (ASC Lebedev/SAI MSU), Stanislav A. Korotkiy (Ka-Dar)
on 5 Apr 2013; 17:31 UT
Credential Certification: Kirill Sokolovsky (kirx@scan.sai.msu.ru)

Subjects: Ultra-Violet, X-ray, Cataclysmic Variable

A flaring object in Auriga (06:27:03.78 +39:52:48.7, J2000) was discovered by S. Kaneko on 2013 March 3.44 UT and later confirmed by D. Denisenko, E. Gorbovskoy, V. Lipunov, A. Mantero, E. Guido, A. Ruocco, N. Howes. Further observations by R. Koff and A. Oksanen indicated the presence of early superhumps that together with the outburst amplitude of about eight magnitudes suggest a WZ Sge-type dwarf nova outburst.

A 3ks Swift observation of PNV J06270375+3952504 was performed on March 4.27 UT resulting in detection of a new X-ray source at the optical transient position. The Swift/XRT net count rate is 0.015+/-0.003 cts. The spectrum is consistent with kT = 3 keV thermal bremsstrahlung (integrated 0.2-10 keV flux of 4.5x10^-13 ergs/cm^2/s) with no absorption, however the number of collected photons is insufficient for a detailed spectral analysis. A bright ultraviolet counterpart of the flaring source is detected by Swift/UVOT having M2=10.55+/-0.05 (Vega system). Overall, the object might resemble a fainter version of GW Lib, another WZ Sge-type flare observed by Swift (Byckling et al. 2009, MNRAS, 399, 1576).

We thank the Swift team for rapid scheduling of this observation.

PNV J06270375+3952504 at CBAT Transient Objects Confirmation Page