GammaLib

According to com-rp-rol-drg-057.pdf a TOF corrections needs to be applied to EVP datasets of version 2 and older (see DSD_REP keyword in the EVP file). An example of an old EVP dataset is the one in viewing period 1 of the Crab.

The TOF correction is implemented in TOFCOR in the DAL library DALAAA18 (see dalaaa19.tofcor.f). The correction is automatically implemented when reading an EVP file (see dalaaa19.pevpsr.f):

C    VERNO  integer     data set representation version       PEVPRI   *
C--      De-scale parameter and transform from INTEGER*2 to
C        argument spec
C        Copy data from COMMON PEVPD1 to return variables
         TIMTAG(1) = TIME(1)
         TIMTAG(2) = TIME(2)
         MPAR( 1)   = EN(1)
         MPAR( 2)   = EN(2)
         MPAR( 3)   = EN(1) + EN(2)
         MPAR( 4)   = 0
         MPAR( 5)   = PHI
         MPAR( 6)   = 0
         MPAR( 7)   = LOC(1)/32.
         MPAR( 8)   = LOC(2)/32.
         MPAR( 9)   = LOC(3)/256.
         MPAR(10)   = LOC(4)/32.
         MPAR(11)   = LOC(5)/32.
         MPAR(12)   = LOC(6)/256.
         MPAR(13)   = LOC(7)/128.
         MPAR(14)   = LOC(8)/128.
         CLASS      = CL
         MODCOM     = MC
         REFLAG     = RF
         VETO       = VF
         EVSCT(1)   = CO(1)
         EVSCT(2)   = CO(2)
         EVSCT(3)   = CO(3)
         EVSCT(4)   = CO(4)
         EVSCT(5)   = EH
         CTYP = CLASS(1:3)
C
C Now do the TOF correction for dataset versions < 3
C

         IF(VERNO.LT.3)THEN
C
C   Do not correct for SIM events
C
            IF (CTYP .NE. 'SIM') THEN
              IF (REFLAG .GE. 4) THEN
                CALL TOFCOR(MPAR(1),MPAR(2),MPAR(14),IDUM)
              ENDIF
           ENDIF
         ENDIF

      ELSE