GCN Circular 2421
HETE Prompt GRB Light Curves and Color-Color Diagrams The HETE team has implemented software which will automatically post to the HETE web site (http://space.mit.edu/HETE/Bursts) lightcurves from localized GRBs within minutes of the reception of the full burst data set. The lightcurves are in ASCII format and include time since trigger (seconds), and Fregate band A, B, and C counts/second, where band A is 7-40 keV, band B is 7-80 keV, band C is 30-400 keV, and the bin size is 160ms. The lightcurves will typically cover a five-minute time period starting roughly two minutes before the burst trigger time, and so will include ample data for fitting the background. A sample of such a lightcurve file can be found at http://space.mit.edu/HETE/Bursts/GRB030723/GCN_LCs-H2777.dat The burst web page will also include a color-color diagram calculated from the counts fluence in Fregate bands A, B, and C. This color-color diagram, which plots the ratio of band B to band A counts fluence vs. the ratio of band C to band A counts fluence, is useful in distinguishing XRFs from classical GRBs, and X-ray rich GRBs form a bridge between the two distributions: for an example, see http://space.mit.edu/HETE/Bursts/GRB030723 Further improvements in the prompt data to the web page are being implemented and will be announced soon.