2004IAUC.8325....2R

G. Richards, D. Johnston, and J. Hennawi, Princeton University Observatory, report that an emission-line enhancement has been observed for the second time in component A of the wide-separation, quadruply imaged quasar SDSS J100434.82+411239.5 (component A, R.A. = 10h04m34s.82, Decl. = +41o12'39".5, equinox 2000.0; magnitude i = 18.4; Inada et al. 2003, Nature 426, 810). Specifically, the blue wings of several high ionization emission lines were enhanced in component A on Mar. 26 and Apr. 10 with respect to observations made in 2003 Nov./Dec., based on data taken with the ARC 3.5-m telescope at Apache Point Observatory. This second epoch of enhancement follows that of 2003 May, confirming the time-dependent nature of this possible microlensing event as reported by Richards et al. (2004, Ap.J., in press; http://xxx.lanl.gov/abs/astro-ph/?0402345). No enhancement has been seen in component B (position end figures 34s.94, 43".0), despite the short A-B time delay (< 30 days) and good time sampling. Follow-up observations of components A and B are needed to confirm the microlensing nature of the event and to probe both the microlens distribution and the structure of the broad emission-line region.