Light curves (log of the count rate for AIA, arbitrary units for GOES, log of the count rate for RHESSI, but shifted downward by 2.2 for the 3–12 keV light curve, and 1.65 for the 12–25 keV light curve) from eight wavelength channels on AIA averaged over area B (see Fig. 1) in which the brightening started later during the B4.8 microflare on July 31. Solid vertical lines indicate the start of an increase in EUV emission observed by AIA no later than 05:23:45 UT, the start of a rapid rise in EUV emission no later than 05:26:15 UT, and the start of the second burst recorded by GOES at 05:27:08 UT.