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The acquisition of late-time imaging is an important step in the analysis ofpre-explosion observations of the progenitors of supernovae. We presentlate-time HST ACS WFC observations of the sites of five Type IIP SNe: 1999ev,2003gd, 2004A, 2005cs and 2006my. Observations were conducted using the F435W,F555W and F814W filters. We confirm the progenitor identifications for SNe2003gd, 2004A and 2005cs, through their disappearance. We find that a sourcepreviously excluded as being the progenitor of SN 2006my has now disappeared.The late-time observations of the site of SN 1999ev cast significant doubt overthe nature of the source previously identified as the progenitor inpre-explosion WFPC2 images. The use of image subtraction techniques yieldsimproved precision over photometry conducted on just the pre-explosion imagesalone. In particular, we note the increased depth of detection limits derivedon pre-explosion frames in conjunction with late-time images. We use SEDfitting techniques to explore the effect of different reddening componentstowards the progenitors. For SNe 2003gd and 2005cs, the pre-explosionobservations are sufficiently constraining that only limited amounts of dust(either interstellar or circumstellar) are permitted. Assuming only a Galacticreddening law, we determine the initial masses for the progenitors of SNe2003gd, 2004A, 2005cs and 2006my of 8.4+/-2.0, 12.0+/-2.1, 9.5(+3.4,-2.2) and9.8+/-1.7Msun, respectively.

A Late-Time View of the Progenitors of Five Type IIP Supernovae