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Two long gamma-ray bursts, GRB 060505 and GRB 060614, occurred in nearbygalaxies at redshifts of 0.089 and 0.125 respectively. Due to their proximityand durations, deep follow-up campaigns to search for supernovae (SNe) wereinitiated. However none were found in either case, to limits more than twoorders of magnitude fainter than the prototypical GRB-associated SN, 1998bw. Itwas suggested that the bursts, in spite of their durations (4 and 102 s),belonged to the population of short GRBs which has been shown to be unrelatedto SNe. In the case of GRB 060614 this argument was based on a number ofindicators, including the negligible spectral lag, which is consistent withthat of short bursts. GRB 060505 has a shorter duration, but no spectral lagwas measured. We present the spectral lag measurements of GRB 060505 usingSuzakus Wide Area Monitor and the Swift Burst Alert Telescope. We find that thelag is 0.36+/- 0.05 s, inconsistent with the lags of short bursts andconsistent with the properties of long bursts and SN-GRBs. These resultssupport the association of GRB 060505 with other low-luminosity GRBs also foundin star-forming galaxies and indicates that at least some massive stars may diewithout bright SNe.

The Spectral Lag of GRB060505: A Likely Member of the Long Duration Class