http://gcn.gsfc.nasa.gov/ web site. The HEASARC table will be updated on a twice-per-week basis whenever the original tables are updated.
For more information about HETE-2 please see the HETE-2 archive website: http://heasarc.gsfc.nasa.gov/docs/hete2/
S/C_Alert - An S/C alert notifies that HETE has detected a burst, but does not guarantee that the trigger was due to a valid burst, or that a localization will be forthcoming. Strength of burst and timescale are supplied. This is the first Notice for a given trigger; it appears only once for each trigger. On rare occasions when the s/c is out of contact with the Secondary Ground Stations, the S/C will create the S/C_Alert before contact is re-established. This S/C_Alert will have the position determination and so it is possible to have an S/C_Alert with a position. This will happen <10% of the time. S/C_Update - These contain any new burst information and, most importantly, the best localizations to date from the WXM and/or SXC, along with "goodness" indicators for each. Zero to N messages of this type are possible (the 0 case is possible if the burst is over before a Secondary Ground Station comes into view and so only the S/C_Last would be transmitted -- this is rare). It is also possible to have these Updates without any position information. The operations team can (and has) commanded off the position content; this is happening while the s/c is looking at the very active Galactic Center which is producing a high rate of X-ray Burster triggers of very low detection significance (and therefore large position error). S/C_Last - These give a summary of the on-board analyses of the burst. This includes the timescale of the burst, peak brightness, best (if any) localizations by the WXM and SXC, and, if appropriate a "never mind" indicator and the reason for the burst's invalidation (ie a non-GRB trigger). This is the last of the real-time Notices; it appears only once for each trigger. GndAnalysis - contains the best positions available from ground post-processing at the time of the message. Multiple messages of this type are possible, if the ground team conducts even further analysis. Please note that it is possible for a trigger to be classified as "definite GBR" but contain no position. This happens when a burst does not have a large enough signal-to-noise ratio to calculate a reliable position, or when a burst is outside the FOV of the two imaging instruments and is determined to be a burst by looking at the FREGATE light curve or from some external information e.g information from another mission.
The numerical values have the following meanings:
GRB 10 Possible or Probable GRB 9 SGR 8 GRB or XRB 7 Possible GRB or XRB 6 XRB 5 Not a GRB 4 Invalid Trigger 3 Particle Event 2 Unclear 1
HEASARC User Hotline.