TITLE: GCN CIRCULAR NUMBER: 7002 SUBJECT: GRB 071025A: Complex Early-Time IR Behavior, Simultaneous with Gamma- and X-rays DATE: 07/10/25 20:40:25 GMT FROM: Josh Bloom at UC Berkeley J. S. Bloom, N. R. Butler, D. A. Perley, D. L. Starr, R. Foley (UC Berkeley) report: "We obtained simultaneous J, H, and Ks band images with fine time sampling (7.8s cadence) of the afterglow (Rykoff et al. 6987; Covino et al. 6988) of GRB 070125A (Pagani et al. 6986) with PAIRITEL (*) beginning ~200s after the BAT trigger. The beginning of the observations coincides with the fading tale of the prompt emission. The IR light curve initially rises, then exhibits two prominent peaks (at T+~500s and T+~1500s) before fading as a powerlaw t^{-1.5+/-0.1}, after t ~ 2000s. A refined data reduction and a search for potential color variations are in progress." This message may be cited. (*) http://pairitel.org ***************************************************** Joshua Bloom Assistant Professor, UC Berkeley 601 Campbell Hall, Berkeley, CA 94720 (510) 643-3839 [Office] 447 Campbell (510) 643-4621 [Lab] 260 Evans http://astro.berkeley.edu/~jbloom *****************************************************