Extended Data Figure 3 : Pre-explosion nondetection limits for iPTF14hls.

From: Energetic eruptions leading to a peculiar hydrogen-rich explosion of a massive star

Extended Data Figure 3

Data from P48 (R band, 3σ nondetections), CSS (unfiltered, obtained via the CSS website), and ASAS-SN (V band, 3σ nondetections—the dark-blue arrow is a deep coadd of the three images taken during the time range denoted by the horizontal line in the marker) are shown. The dashed line indicates the discovery magnitude and the shaded region shows the 1954 outburst magnitude and its uncertainty.