[IGSMAIL-7392] igs08_1927.atx: Update including reactivated GLONASS-M satellite R723

[Ralf Schmid]

Dear IGS colleagues!

The absolute IGS antenna correction file (igs08_wwww.atx) has been 
updated. The new release is called 'igs08_1927.atx'. It contains the 
following changes:

1) According to the Information and Analysis Center for Positioning, 
Navigation and Timing (IAC), GLONASS-M satellite R723 replaced GLONASS-M 
satellite R737 in almanac slot 12. Therefore, the following satellite 
has been added:

R12 (R723)

sources:
> 12 	2 	-1 	723 	25.12.07 	  	  	107.8 	- 	- 10:08 15.12.16 	Commissioning Phase
https://www.glonass-iac.ru/en/GLONASS/

> According to GLONASS System Control Centre, the SC Glonass-M #723 at 00:00 MT (UTC+3) 15.12.2016 in commissioning phase
https://www.glonass-iac.ru/en/content/news/?ELEMENT_ID=1799

2) According to the IGS tracking statistics provided by CODE 
(ftp://ftp.unibe.ch/aiub/igsdata/odata_gnss_day.txt), R737 stopped 
signal transmission on 21 November 2016 (DOY 326). Therefore, a 
decommission date for the following satellite has been added:

R12 (R737): 21 November 2016

source:
> According to GLONASS System Control Centre, the SC Glonass-M #737 at 00:00 MT (UTC+3) 15.12.2016 under check by the Satellite Prime Contractor
https://www.glonass-iac.ru/en/content/news/?ELEMENT_ID=1798

3) The start date of the reactivated Block IIA satellite G034/G04 was 
corrected:

7 December 2016  -->  9 December 2016


The updated antenna correction model is available at
ftp://ftp.igs.org/pub/station/general/igs08_1927.atx
or
ftp://ftp.igs.org/pub/station/general/igs08.atx

With best regards,
Ralf Schmid
on behalf of the IGS Antenna Working Group