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We derive simple analytic expressions for the continuum lightcurves andspectra of flaring and flickering events that occur over a wide range ofastrophysical systems. We compare these results to data taken from thecataclysmic variable SS Cygni and also with SN 1987A, deriving physicalparameters for the material involved. Fits to the data indicate a nearlytime-independent photospheric temperature arising from the strong temperaturedependence of opacity when hydrogen is partially ionized.Comment: 18 pages, 19 figures, accepted for publication in Ap

Fireballs, Flares, and Flickering: A Semianalytic, LTE, Explosive Model from Accretion Disks to Supernovae