TTE Data for Short Bursts in ASCII Format
Description of FormatThe ASCII files for TTE data on short bursts have variable-length records, with a maximum record length of 80 bytes. The median file size is ~280K bytes. Four header records precede two large arrays. An example of a 4-record header follows:
-
BATSE burst trigger = 00138
npts = 24569
1st array: "npts" times (unit = 1 microsec)
2nd array: associated energy chan #s (1, 2, 3 or 4)
3rd array: associated detector #s (0=>7)
The first header record lists the burst trigger number as a 5-character string, zero-padded, in columns 25-29.
The second record lists the total number of photon times written into the file. These photons are for all 4 energy channels (~25-55, 55-110, 110-320, >320 keV), but ONLY FOR THE TRIGGERED detectors. In these two characteristics (energy bands and summed detectors), this derivative TTE data type is compatible with the DISCSC data type. Number of photons, npts, is recorded in columns 17-21 of the second record; npts is the size of the two arrays following the header records.
Header record 3 explains that the first array contains the times of the npts photons, where the unit is microseconds (with 2-microsecond precision) and the origin of time is near the time of the first photon. Header records 4 and 5 explain that the second and third arrays give the channel number, respectively, for the associated time in the first array.
Immediately following the header are the two arrays, the first array (photon arrival times) written with (10I8) format and the second (energy channel number) with (40I2) format.
Instructions for Downloading
TTE data for short bursts are available in ASCII files.
Select files for downloading
Also, the entire set of ASCII TTE data for short bursts may be downloaded as follows. Open a connection to cossc.gsfc.nasa.gov via Anonymous FTP:
% ftp cossc.gsfc.nasa.gov
When prompted to enter a username, enter the name "anonymous". When prompted to enter a password, enter your complete e-mail address. Then change default directories to the location of the ASCII TTE data distribution area:
ftp> cd compton/batse_tte/tte_ascii
Turn off file name prompting by entering the "prompt" command:
ftp> prompt
Then, use the FTP mget command to copy all the visible files in that subdirectory:
ftp> mget *
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