Homework 12 (due Apr 22) · Homework 12 (Upper Limits) You observe 19 counts in a source region. You have also observed 100 counts in a background region that is 10 times the area of the source region. ... Is a source detected? ... Use two different ways to set the detection threshold: first, using only the nominal distribution of the background counts, and second, using a S/N measure. ... Use any threshold level to decide on the detection that you like, but describe how you chose it. ...