GCN Circular 4401
S. Barthelmy (GSFC), N. Gehrels (GSFC), J. Norris (GSFC), T. Sakamoto (GSFC/NRC) on behalf of the Swift-BAT team: Continuing the analysis of GRB 051227, we point out the possibility that this is a short burst. We do not have the full data set downloaded for this burst yet (only T-60 to T+120 sec), but we wish to get this speculation out to the follow-up community to facilitate observations as soon as possible (i.e. CA coast and Hawaii big glass). We base this on 2 observations: 1) The spectral lag is negligible, 2+-10 ms (1 sigma), between the 25-50 and 100-350 keV energy bands -- typical of spectral lags in short bursts (Norris & Bonnell, submitted to ApJ). The median lag for long bursts is 50 ms, and only 1% of long bursts have a lag less than 2 ms. 2) The overall shape of the lightcurve of GRB 051227 is similar to the lightcurve of the short hard burst GRB 050724. The initial hard spike is followed by 1 or 2 smaller short peaks at delays of one to several seconds. Then a period of hiatus, followed by a broad low-level soft emission emission that starts at a few tens of seconds out to 100+ seconds. However, we can not rule out that this is a FRED-like profile with a very long low-statistics decay tail.