MexSat-1 will be launched by a Proton-M/Briz-M on April 24, 2015.
Tender from the Centre for Operation of Land-Based Space Infrastructure (TsENKI) for insurance to cover various launch sites; for preparation and launch of rockets «Proton», «Soyuz», «Zenit»:-
http://www.zakupki.gov.ru/223/purchase/public/purchase/info/common-info.html?noticeId=1922237Direct link to document, dated 29th December 2014:-
http://www.zakupki.gov.ru/223/purchase/public/download/download.html?id=10741151РКН: КА «Мекссат-1», РН «Протон-М»
Дата запуска: 2 кв. 2015
Страховая сумма (лимит ответственности) млн.руб.: 2 558,10
Страховая премия (максимальный тариф) млн.руб.: 17,9
Launch: satellite Mexsat-1, rocket Proton-M
Launch date: 2nd quarter of 2015
The sum insured (limit of liability), million ruble: 2 558,10
Insurance premium (maximum tariff), million ruble: 17,9
Satellite:
Mexsat-1| Operator: | Secretaria de Communicaciones y Transportes México |
| Nation: | Mexico |
| Contractors: | Boeing Satellite Systems |
| Platform: | BSS-702HP |
| Equipment: | L-band, Ku-band transponders |
| Mass: | 5,325 kilogrammes (at launch), 3,200 kilogrammes (start of operation) |
| Service life: | 15 years |
| | |
| Launch vehicle: | Proton-M 8К82КМ with improved energy-mass characteristics (phase 3) № 93554 |
| Upper stage: | Briz-M 14С43 with improved energy-mass characteristics (phase 3) № 99555 |
| Fairing: | 15,255 millimetre 14С75 with improved energy-mass characteristics (phase 3) |
| Launch site: | Baikonur 8П882К-4Ф (ПУ № 39) |
| | |
| Khrunichev I.L.S. contract: | ILS-SC-1202-686 dated 1st March 2012 |
http://www.boeing.com/boeing/defense-space/space/bss/factsheets/702/mexsat/mexsat.pageWith thanks to Skyrocket:-
http://space.skyrocket.de/doc_sdat/mexsat-1.htm
April 29 – MexSat-1 – Proton-M/Briz-M – Baikonur, 200/39
launch vehicle "Proton-M" and the upper stage "Breeze-M", for the launch of the Mexican satellite Communication «MexSat-1", arrived yesterday to Baikonur Cosmodrome.
tsenki.com
launch vehicle "Proton-M" and the upper stage "Breeze-M", for the launch of the Mexican satellite Communication «MexSat-1", arrived yesterday to Baikonur Cosmodrome.
tsenki.com
So they now deliver the Briz-M upper stage by train along with the Proton-M rocket? In the past they were flown in separately.
I'm still looking for the launch time on April 29 of this one in vain. Anyone knows this?
I'm still looking for the launch time on April 29 of this one in vain. Anyone knows this? 
Hmm this press release from the Mexican Government has this as both midnight Mexican time (from Mexico City I guess, which is UTC-5) and 13:00 in Baikonur (UTC+6), which is inconsistent. Which one is correct?
we should be correct because we are extremely rarely wrong in our info
we should be correct because we are extremely rarely wrong in our info
Looks like the Baikonur time is the correct one - launch will be at 07:07 UTC.
Looks like the Baikonur time is the correct one - launch will be at 07:07 UTC
And the source of this information is...
Μexsat (Centenario) launch poster
PROTON LAUNCH OF CENTENARIO SATELLITE POSTPONED
BAIKONUR COSMODROME, Kazakhstan, April 27, 2015-The launch of a Proton launch vehicle with the Centenario satellite was postponed in order to investigate an anomalous condition discovered on another spacecraft and to re-confirm the flight worthiness of the Centenario satellite.
The vehicle and satellite remain in a safe configuration at the launch site.
The satellite was built by Boeing Satellite Systems International for the Mexican government’s Ministry of Communications and Transportation, the Secretaria de Comunicaciones y Transportes (SCT).
For updated status on the Centenario mission, please check the ILS website,
www.ilslaunch.com.
Currently the team is looking at a new launch date of May 15-16. Boeing et al. will decide on whether processing operations can restart by tomorrow:
http://tass.ru/kosmos/1939439
Some launch information about this mission from Khrunichev...