[daip] UTC for VLBA data?

[Vivek Dhawan]

Hi Bill and co.

I believe CLCOR does its correction based on the difference between
the "correct EOP" in the USNO file which it fetches from the web (or
the user fetches from USNO) and the actual numbers used by the correl-
ator and recorded in the AIPS CT table. So if your data have a CT
table they should be fixable.

And (though I cannot actually remember) the CT table probably was
written as far back as 1995, but you can check that easily if you
have the data loaded.

yes VLBA times are UTC but I cant' say offhand if that is start, mid,
or end of integration.

Vivek.

Leonia Kogan wrote:
> Hello,
> 
> I created the EOPS option in CLCOR. This option was created especially 
> for the time intervals when UTC-UT1 was not calculated correctly by the 
>  VLBA correlator. Vivek Dhawan may give you a better answer on your 
> question about the times.
> 
> Leonid Kogan
> Bill Peterson wrote:
>> Hello,
>>
>> Is VLBA data by default timestamped in UTC? As I understand it, 
>> VLBAEOPS (or CLCOR run with the EOPS parameter) will perform 
>> corrections for errors in UTC-UT1, but I assume that the corrections 
>> are estimated by the VLBA correlator, as are the Earth Orientation 
>> Parameters.
>>
>> Further, was there a period of time during which the corrections for 
>> UTC-UT1 might not be calculated correctly for some archive data 
>> (specifically data from November 1995)?
>>
>> Thanks!
>>
>> Bill Peterson
>>
>>
>>
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