NASA has never been known to give more than a few days notice prior to big announcements, and they have never set up a custom domain to give out the knowledge before. Here is the email that announced that Voyager 1 left the Solar System, which is one of the biggest announcements that NASA has made in some time. Note that this was done only a day in advance. The only way that anyone would know about something sooner is if they worked for NASA, or reviewed a big paper it was about to publish, in which case they would not be permitted to do anything about it.
JPL/NASA News
News advisory: 2013-276b Sept. 12, 2013
NASA News Conference Today to Discuss Voyager Spacecraft
The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.php?release=2013-276&cid=release_2013-276
PASADENA, Calif. - NASA will host a news conference today at 11 a.m. PDT (2 p.m. EDT), to discuss NASA's Voyager mission. It is related to a paper to be published in the journal Science, which is embargoed until 11 a.m. PDT (2 p.m. EDT).
The briefing will be held at NASA Headquarters in Washington and air live on NASA Television and the agency's website.
During the news conference, the public may send questions via Twitter to #AskNASA.
For NASA TV streaming video, scheduling and downlink information, visit: http://www.nasa.gov/ntv .
The event will also be streamed live on Ustream at: http://www.ustream.tv/nasajpl2 .
For information about the Voyager mission, visit: http://www.nasa.gov/voyager .
DC Agle/Jia-Rui Cook 818-393-9011/818-354-0850
Jet Propulsion Laboratory, Pasadena, Calif.
agle@jpl.nasa.gov/jccook@jpl.nasa.gov
Dwayne Brown 202-358-1726
NASA Headquarters, Washington
dwayne.c.brown@nasa.gov
Furthermore, let's look at the domain registry information for the site:
[Querying whois.verisign-grs.com]
[Redirected to whois.enom.com]
[Querying whois.enom.com]
[whois.enom.com]
=-=-=-=
Registration Service Provided By: Namecheap.com
Contact: support@namecheap.com
Visit: http://namecheap.com
Registered through: eNom, Inc.
Domain name: rememberthe13th.com
Registrant Contact:
WhoisGuard, Inc.
WhoisGuard Protected ()
Fax:
P.O. Box 0823-03411
Panama, Panama NA
PA
Administrative Contact:
WhoisGuard, Inc.
WhoisGuard Protected (b8bd1b7f7bdf45ed942317298e44f729.protect@whoisguard.com)
+507.8365503
Fax: +51.17057182
P.O. Box 0823-03411
Panama, Panama NA
PA
Technical Contact:
WhoisGuard, Inc.
WhoisGuard Protected (b8bd1b7f7bdf45ed942317298e44f729.protect@whoisguard.com)
+507.8365503
Fax: +51.17057182
P.O. Box 0823-03411
Panama, Panama NA
PA
I have no idea why someone from Panama would possibly know anything about the workings of NASA, especially during a government shutdown. The odds of this being legitimate are epilon.