Constraining the outburst time of PNV J00424097+4116171

ATel #6281; R. Sturm, W. Pietsch, J. Greiner (MPE, Germany)
on 30 Jun 2014; 14:32 UT
Credential Certification: Richard Sturm (rsturm@mpe.mpg.de)

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We confirm the discovery of the apparent nova PNV J00424097+4116171 in the Andromeda Galaxy (M 31) reported by Hornoch et al. (ATel #6278, ATel #6279). The source is detected as a UV transient in monitoring observations of the central region of M 31 with the Ultra-Violet/Optical Telescope (UVOT) on board the Swift satellite.
Light curve information for filter uvw1 (central wavelength: 260 nm) is given in the table below (Vega system, 1σ statistical uncertainty or 3σ upper limit, respectively). All magnitudes are on the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) and have not been corrected for extinction. The two Swift/UVOT exposures allow us to tightly constrain the outburst time in the UV to be within 2014-06-27 19:23 and 21:26 (UT).

  
ObsID[exp]       MJDstart      Exp     uvw1              
                              [s]     [mag] 
00032702060[2]   56835.808    1564    >19.12 
00032702060[3]   56835.875    1565    15.99±0.07 

Note that the position of PNV J00422866+4114126 (ATel #6278, ATel #6279) was not covered by the Swift observation.

We would like to thank the Swift Team for making these observations possible, in particular N. Gehrels, the duty scientists, as well as the science planners.