TITLE: GCN CIRCULAR NUMBER: 11728 SUBJECT: Swift GRB110213A: interesting behaviour DATE: 11/02/14 17:27:41 GMT FROM: Massimiliano de Pasquale at MSSL-UCL M. De Pasquale (MSSL-UCL), V. D'Elia (ASDC) and P. Kuin (MSSL-UCL) report, on behalf of the Swift team: GRB110213A (D'Elia et al., GCN circ 11705) exhibits an interesting behaviour both in the X-ray and optical bands. After a broad peak and phase of normal decline, the lightcurves show achromatic breaks at about T0+10 ks, after which the slopes in both bands becomes about -2. These data strongly indicate that we are seeing a very early jet break. We encourage observations from ground facilities. The predicted magnitudes for 00:00 UT of 15/2/2011 are R ~ 22.6, v ~ 21.7, b ~ 23.8, u ~ 21.7.