The Power-Law Rag (to the tune of "The Vatican Rag", by Tom Lehrer) First you get down on your knees, fiddle with your indices, trot out your best Blandford-McKee, and squiggle Gamma! sguiggle r! squiggle t! The electrons' E's as minus p, Gamma is r to the minus g. To model afterglow or burst choose internal, forward, or reverse! Light curve data on log-log plots, time to play connect-the-dots! If the cooling break has just ploughed by a spectral index drop is neigh! Radiative or adiabatic the result is automatic, doin' the Power-Law Rag! (c) Carlo Graziani, 1999