TITLE: GCN CIRCULAR NUMBER: 6529 SUBJECT: GRB 070612A: spectral lag DATE: 07/06/13 19:28:21 GMT FROM: Jay Norris at Stanford U J.P. Norris (U.Denver), S.D. Barthelmy (GSFC), N. Gehrels (GSFC): Spectral lag analysis of the two main emission episodes in GRB 070612A, described in GCN Circ. 6522 (Barthelmy et al.) indicate that this burst has relatively long lags, comparable to and longer than that of GRB 980425 (~ 2-3 s), the first burst associated with a supernova. For the first, brighter FRED-like pulse structure, the lag measurement between BAT energy bands 15-25 keV and 50-100 keV (25-50 and 100-350 keV) is 2.5 s +2.1-1.8 s (2.5 +0.7-0.5 s). For the second, dimmer pulse structure, the 15-25 keV to 50-100 keV lag is 5.8 s +2.6-1.9 s. The flux in the 100-350 keV band for this second episode was too low to make a useful measurement. Spectral lags of several seconds indicate a relatively low luminosity burst, consistent with the nearby host (z ~ 0.1) described in GCN Circ. 6525 (Cenko et al.).