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Swift/UVOT upper limits on SN 2017eaw before explosion

ATel #10382; S. Campana (INAF-Brera), P. Kuin (MSSL/UCL)
on 16 May 2017; 20:48 UT
Credential Certification: Sergio Campana (campana@merate.mi.astro.it)

Subjects: Optical, Ultra-Violet, Supernovae

We report on historical Swift/UVOT observations of SN 2017eaw in NGC 6946 (Dong & Stanek ATel #10372). Swift/UVOT observed several times NGC 6946 over the years. Summing up all the images on a filter basis, we never detected the progenitor star. We were able to derive 3sigma upper limit as below:

 
Filter    |  m_vega | m_AB   | Exposure (s) 
    v     |  20.27  | 20.26  | 1529 
    b     |  21.22  | 21.10  | 1679 
    u     |  21.03  | 22.05  | 2334 
    w1    |  21.61  | 23.14  | 5530 
    m2    |  21.69  | 23.37  | 5030 
    w2    |  21.91  | 23.60  | 6067 
Upper limits were derived using a 3 arcsec aperture centred on SN 2017eaw position. No correction has been made for the reddening of E(B-V)=0.29 (Schlafly & Finkbeiner 2011 ApJ 737, 103).