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/*****************************************************************************
* Johns Hopkins University
* Center For Astrophysical Sciences
* FUSE
*****************************************************************************
*
* Synopsis: cf_modify_hist_times (fitsfile *infits, long nevents,
* float *time, GTI *gti);
*
* Description: For histogram data, set photon-arrival times to the midpoint
* of the longest good-time interval.
*
* Arguments: fitsfile *infits Input FITS file pointer
* long nevents Number of photon events
* float *time Time array for photon list
* GIT *gti Good time interval(s)
*
* Calls:
*
* Returns: TRUE if time array is changed.
* FALSE if time array is not changed.
*
* History: 06/02/04 1.1 wvd Initial coding
* 06/07/04 1.2 wvd Use standard return values.
* 02/17/05 1.3 wvd Initalize jmax to 0.
*
****************************************************************************/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "calfuse.h"
int
cf_modify_hist_times (fitsfile *infits, long nevents, float *time, GTI *gti)
{
char CF_PRGM_ID[] = "cf_modify_hist_times";
char CF_VER_NUM[] = "1.3";
int errflg=0, status=0;
long j, jmax=0;
float exptime, gti_time, max_time, photon_time, rawtime;
cf_error_init(CF_PRGM_ID, CF_VER_NUM, stderr);
cf_timestamp(CF_PRGM_ID, CF_VER_NUM, "Begin Processing");
/* If data were not taken in HIST mode, exit now. */
if ((errflg = cf_proc_check(infits, CF_PRGM_ID))) return errflg;
/* Read header keywords. */
FITS_read_key(infits, TFLOAT, "EXPTIME", &exptime, NULL, &status);
FITS_read_key(infits, TFLOAT, "RAWTIME", &rawtime, NULL, &status);
/*
* If the entire exposure was rejected by the screening routines,
* we don't bother changing photon-arrival times. If no time was
* lost to screening, the default arrival times are OK. Exit now.
*/
if (exptime < 1. || exptime > rawtime - 1.) {
cf_proc_update(infits, CF_PRGM_ID, "COMPLETE");
cf_timestamp(CF_PRGM_ID, CF_VER_NUM, "Done processing");
return -1;
}
/* Determine which is the longest good-time interval. */
max_time = 0.;
for (j = 0; j < gti->ntimes; j++) {
if ((gti_time = gti->stop[j] - gti->start[j]) > max_time) {
max_time = gti_time;
jmax = j;
}
}
/* Set all photon-arrival times to midpoint of longest GTI. */
photon_time = (gti->start[jmax] + gti->stop[jmax]) / 2.;
for (j = 0; j < nevents; j++)
time[j] = photon_time;
cf_verbose(1, "Setting photon-arrival times to %.1f", photon_time);
cf_proc_update(infits, CF_PRGM_ID, "COMPLETE");
cf_timestamp(CF_PRGM_ID, CF_VER_NUM, "Done processing");
return status;
}
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