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Further multiwavelength observations of Nova Cyg 2014

ATel #6108; T. Nelson (U. Minnesota), J. Linford, L. Chomiuk, T. Finzell (MSU), K. Mukai (UMBC & NASA/GSFC), J. L. Sokoloski, J. Weston (Columbia), M. Rupen & A. Mioduszewski (NRAO)
on 29 Apr 2014; 18:33 UT
Credential Certification: Thomas Nelson (tnelson@physics.umn.edu)

Subjects: Radio, Ultra-Violet, X-ray, Nova

We have continued to monitor Nova Cyg 2014 (ATels #6051, #6060) at multiple wavelengths since its discovery on 2014 March 31. We obtained radio observations of the nova with the Karl J. Jansky VLA at C- and Ka-bands on 2014 April 05 and April 22 (5 and 22 days after discovery). The Ka-band observations were carried out in the VLA's 3-bit mode with 8 GHz of bandwidth split between two sidebands. For the C-band observations, we used the standard 8-bit mode with 2 GHz of bandwidth split between two sidebands. The VLA did not detect radio emission at the position of the nova in either set of observations; 3-sigma upper limits are presented below.

Date Frequency (GHz) Flux Density (mJy)
2014-04-05 4.55 <0.028
2014-04-05 7.84 <0.040
2014-04-05 29.5 <0.12
2014-04-05 35.0 <0.12

2014-04-22 4.55 <0.036
2014-04-22 7.38 <0.039
2014-04-22 29.5 <0.063
2014-04-22 35.0 <0.070

We also obtained a second epoch of X-ray and UV observations of Nova Cyg 2014 with the Swift satellite on 2014 April 15 (Day 15; see ATel #6051 for details of the first Swift observation). The nova remains undetected in X-rays. The XRT exposure was 3871 seconds, resulting in a 3-sigma upper limit to the count rate of <0.002 cts/s in the 0.3-10 keV energy range.

A UV image was obtained with the UVOT instrument in the UVM2 filter (central wavelength 2246 Angstroms). Nova Cyg 2014 brightened by 0.6 magnitudes since the first observation to a UVM2 magnitude of 15.39 +/- 0.04.

Further radio and X-ray observations are planned, including a monitoring campaign with XMM-Newton. Observations at other wavelengths, especially optical and infrared, are encouraged.