This image released by NBC shows Tina Fey as Liz Lemon, left, and Jane Krakowski as Jenna Maroney in a scene from the series finale of "30 Rock," airing Thursday, Jan. 31, 2013 on NBC. (AP Photo/NBC, Ali Goldstein)

Here’s what’s being talked about today in pop culture:

• If you’re still in mourning over the end of “30 Rock,” grief counselors are standing by online. [Vulture, The Huffington Post]

• Sure, you’re going to see it during the Super Bowl — but if you can’t wait, the “World War Z” trailer is online. [Entertainment Weekly]

• Ed Koch, the irascible former mayor of New York, died this morning at the age of 88. [CNN]