Closing in on a Short-Hard Burst Progenitor Constraints from Early-Time Optical Imaging and(8)

Near-infraredimageswereobtainedwiththe1.3mPAIRITELintheJ,H,andKsbands(seeBlakeetal.2005).Observationsconsistedofa1130sintegrationcomprisedof7.8sditheredexposuresbeginningat04.1375hr.Thesedatawerereducedbymedian-combiningsetsofindividualexposureswithinamoving5-minutewindow.Theresultingmedianwasusedtosubtractthebrightskyfromtheindividualimages.Finally,alloftheindividualimageswerecombinedtomakehigh-resolutionmosaicsusingamodi edversionofdrizzle(Fruchter&Hook1997).Zero-pointsweredetermined2MASSstarsinthe eld.UpperlimitsintheJ,H,KsmosaicswereestimatedusingthesametechniqueasfortheWIYNdata.TheWIYNand