The SWIFT BAT Software Guide Version 6.3 30 ... - HEASARC - Nasa

56 CHAPTER 6. BAT ANALYSIS ISSUES
This is a logic error within the batoccultgti script.
The workaround is to supply a minimal partial coding constraint. For example, use the command
line parameter, “pcodethresh=0.011”.
6.2.2 batbinevt: ignores standard 4-channel energy bins
Task: batbinevt
Version: CALDB release on 27 Jun 2007
What builds: Any build with above CALDB release
Problem: Specifying CALDB:4 for standard 4-channel energy bins does not work
Status: Fixed (Swift CALDB release 30 Jul 2007)
Updated: 30 Jul 2007
NOTE: This issue was resolved with the Swift CALDB release on 30 Jul 2007. Users are
advised to download this new CALDB release.
The BAT team maintains “standard” energy bins in the Calibration Database (CALDB). There
are two sets: a 4-channel set, usually for light curves, and an 80-channel set, usually for spectra.
These two sets of energy bins are selected on the command line with energybins=CALDB:4 or
CALDB:80.
An error in a recent CALDB submission has caused this feature to stop working. The problem
is an unrelated file that also has an EBOUNDS extension, which confuses the batbinevt CALDB
access routines. The result is that if the user requests CALDB:4, i.e. standard 4-channel binning,
batbinevt produces 80 energy bins instead.
While the problem appears to be a problem in the software, the true problem is in the CALDB.
A revised CALDB version (dated 30 Jul 2007) is available from HEASARC.
There are two workarounds if it is not possible to use the 30 Jul 2007 CALDB release:
1. Revert to a previous version of CALDB;
2. Specify the four-channel bins explicitly (the bins in keV are ”energybins=15-25,25-50,50-
100,100-350”).
6.2.3 batbinevt: DPH rows with fractional exposure are not accounted for
properly
Task: batbinevt
Version: 1.38 and earlier
What builds: HEASoft 6.2 and earlier
Problem: DPHs made by batbinevt with fractional exposure can’t be fed back into batbinevt
Status: Closed (HEASoft 6.3)
Updated: 17 Jul 2007
NOTE: this bug was fixed in HEASoft version 6.3.
batbinevt can be used to “sum” many different detector plane histograms (DPHs) and produce
a single output DPH. However, this DPH cannot normally be re-input to batbinevt, because the
task makes a fundamental assumption that individual input DPHs are contiguous in time.
For example, consider a file with two DPH entries from two disjoint times.
csh> ftlist file.dph T columns=TIME,EXPOSURE