2011-01-13 M.Suzuki
2011-03-21 Y.Terada
Aya Bamba (ISAS/JAXA)
We made arfs for HXD pin data,
and found several unclear points.
-
The default PIN ID and GSO ID are 64 and 17 in fhelp
(which implies that default is PIN),
whereare they are 65 and 10 in the default pfile
(default is GSO).
They should be consistent with each other.
-
In the default pfile,
the description of point_ra and point_dec is
too difficult to expect,
"Calculation Point".
We should have better description.
-
In the header of the output arf file,
somehow we have two comments on attitude and object point.
Is it correct?
I have checked HEADAS 6.5 to 6.9 and got same results.
*** example ***
COMMENT hxdarfgen: teldef = /usr/local/caldb//data/suzaku/hxd/bcf/ae_hxd_tel
COMMENT def_2006 hxdarfgen: attitude = ae401099010.att
COMMENT hxdarfgen: attitude = ae401099010.att
COMMENT hxdarfgen: arf db = /usr/local/caldb//data/suzaku/hxd/bcf/ae_hxd_pin
COMMENT art_2007 hxdarfgen: Object Point (RA, DEC) = (262.6, -34.5)
COMMENT hxdarfgen: Object Point (RA, DEC) = (262.6, -34.5)
COMMENT hxdarfgen: calculation for PIN(0 -- 63, merged)
COMMENT hxdarfgen: PI file = ../../401099010hxd_pin_sr.pi
COMMENT hxdarfgen: out fname = 10_pin.arf
-
Even when we used very accurate value for point_ra and point_dec,
the accuracy level of pointing becomes only 0.1 deg
in the comment of output arf (see above).
Is it only in the comment or really calculated with this less accurate
value ?
Y.Terada (HXD team)
2011-03-25 (for question 1,2,3)
Thanks again for helpful comments.
We will update the help file and pfile of hxdarfgen
in the next release (HEADAS 6.11), which is planed
to be released in April 2011.
2011-11-15(for question 4)
No, The accuracy in the calculation of
hxdarfgen is the double floating, 2^64.
In order to reduce the space in the FITS
header, the tool only displays 0.1 deg
accuracy of RA and DEC.
2011-01-13 Accept
2011-03-21 Resolved (question 1,2,3)
2011-03-25 HEADAS commtted (Done for 1,2,3)
2011-11-15 Done
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Question ID = 0135