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Pre-discovery detection of SN 2017eaw by CRTS-II

ATel #10397; A. J. Drake, S. G. Djorgovski, A. A. Mahabal, M. J. Graham (Caltech); M. Catelan (PUC Chile); E. Christensen, S. M. Larson (LPL/UA)
on 18 May 2017; 19:50 UT
Credential Certification: Andrew J. Drake (ajd@cacr.caltech.edu)

Subjects: Optical, Supernovae

Following the discovery of supernova SN 2017eaw by Patrick Wiggins (Dong and Stanek 2017, ATel#10372), we inspected archival Catalina Survey images covering the location. CSS observations taken starting at UT 2017-05-07 10:15:01 show the presence of a faint object at the location. Based on comparison with archival PS1 photometry, we estimate this source had a magnitude of V_CSS=19.8+/-0.6 at the time.