Pre discovery R band limits for SN 2017aew
ATel #10384; I. A.Steele, A. M.Newsam (Liverpool JMU)
on 17 May 2017; 11:19 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Iain Steele (firstname.lastname@example.org)
Subjects: Optical, Supernovae
Referred to by ATel #: 10385
A 90 second R band image of the galaxy NGC6948 was obtained on 2017 May 06 at 04:13UT using the 2.0m Liverpool Telescope, La Palma. The image was obtained by the National Schools Observatory on behalf of St Anne's Catholic School, Southampton, UK.
Inspection of the image shows no source visible at the co-ordinates of SN 2017aew (ATel #10381) down to a limit of R=21.2 (photometry calibrated with respect to the nearby USNO object 1501-0283085). This is 8 days before the detection of the object by Patrick Wiggins on 2017 May 14 at magnitude 12.8 (ATel #10372).
We also stacked 90 previous R band images of exposure times between 30 and 120 seconds of the galaxy obtained with the same instrumental setup for various users over the period May 2013 - May 2017. We do not detect the progenitor down to a conservative limit of R=22.4.
National Schools Observatory