[Psrfits] STT_DATE and STT_TIME

[Scott Ransom]

It probably isn't a huge issue, but in PRESTO and psrfits_utils, we 
count the STT_* fields as the _real_ time and compare that with 
DATE_OBS.  So if you get rid of the STT_* fields, we will have to change 
those bits of software.

Scott

On 02/25/2014 07:26 PM, Dick.Manchester at csiro.au wrote:
> Hi all
>
> I've come across a bit of an anomaly in the psrfits files being written
> by the Parkes DFBs. When we first defined the psrfits format, we had
> STT_DATE and STT_TIME in the main header. Then in V2.8 (Feb 2007) these
> were removed from the definition and DATE_OBS was added for
> compatibility with FITS standards. Ever since then  STT_DATE and STT_OBS
> have not been in the header template. However, the PDFBs have continued
> to write these lines in the main header (as well as DATE_OBS).
>
> I propose that we cease writing STT_DATE and STT_TIME with the Parkes
> DFBs. They are redundant and furthermore confusing since the the time
> differs slightly from that in DATE_OBS.
>
> I think this is a Parkes-only issue, but if anyone feels that this is a
> bad move, please let me know. I'll wait a week before asking Warwick to
> make the changes.
>
> Regards
>    Dick
>
>
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Scott M. Ransom            Address:  NRAO
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