{
  "bibcode": "2005GCN..4401....1B",
  "body": "S. Barthelmy (GSFC), N. Gehrels (GSFC), J. Norris (GSFC),\nT. Sakamoto (GSFC/NRC)\non behalf of the Swift-BAT team:\n\nContinuing the analysis of GRB 051227, we point out the possibility\nthat this is a short burst.  We do not have the full data set downloaded\nfor this burst yet (only T-60 to T+120 sec), but we wish to get this\nspeculation out to the follow-up community to facilitate observations\nas soon as possible (i.e. CA coast and Hawaii big glass).\nWe base this on 2 observations: \n\n1) The spectral lag is negligible, 2+-10 ms (1 sigma), between the\n25-50 and 100-350 keV energy bands -- typical of spectral lags\nin short bursts (Norris & Bonnell, submitted to ApJ).  The median lag\nfor long bursts is 50 ms, and only 1% of long bursts have a lag less than 2 ms.\n\n2) The overall shape of the lightcurve of GRB 051227 is similar\nto the lightcurve of the short hard burst GRB 050724.  The initial hard spike\nis followed by 1 or 2 smaller short peaks at delays of one to several seconds.\nThen a period of hiatus, followed by a broad low-level soft emission emission\nthat starts at a few tens of seconds out to 100+ seconds.  However, we can not\nrule out that this is a FRED-like profile with a very long low-statistics\ndecay tail.",
  "circularId": 4401,
  "createdOn": 1135734831000,
  "email": "Scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 051227:  Further analysis of the Swift-BAT burst",
  "submitter": "Scott Barthelmy at NASA/GSFC  <Scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 051227"
}