07/11/2013 BOSTON, MA Amanda Mastroberti (cq) (left) 23, of Fitchburg, talked with Rob Gronkowski (cq) during a signing for the book titled "Growing Up Gronk: A Family's Story of Raising Champions" (cq) held at Barnes and Noble (cq) in the Prudential Center (cq). (Aram Boghosian for The Boston Globe)
Amanda Mastroberti spoke with Patriots tight end Rob Gronkowski during a signing for the book titled "Growing Up Gronk: A Family's Story of Raising Champions" held at Barnes and Noble in the Prudential Center. (Aram Boghosian for The Boston Globe)
The Boston Globe

BOSTON – Patriots tight end Rob Gronkowski visited the Barnes and Noble in the Prudential Center on Thursday with his father, Gordie, and his four brothers, to autograph copies of “Growing Up Gronk: A family’s story of raising champions.”

But before he faced the eager New England fans, he was pressed about the arrests of former Patriots tight end Aaron Hernandez and cornerback Alfonzo Dennard.

“I’ve got no reaction at all,” Gronkowski said. “I have no reaction at all, I’m just here about the book.”

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On June 26, Hernandez was charged with first-degree murder in the slaying of Odin Lloyd, and also charged with several gun violations. He was released by the New England Patriots shortly after.

On Thursday morning, Dennard was arrested for suspicion of driving under the influence in Nebraska, according to Lincoln police.

After he offered little about his teammates, Gronkowski was asked if he believed the NFL had an issue regarding players and their off-field activities and deferred to the commissioner.

“Ask Roger Goodell,” Gronkowski said. “You got to ask Roger. He’s been in the business for a while. Roger that.”

Gronkowski, who underwent back surgery on June 18 to repair a herniated disk, appeared at the book signing sporting a t-shirt and jeans, and it appeared he was not wearing a back brace.

It is unclear when he will return to the field, but it is estimated that the surgery will require 12 weeks to heal.

“I got no reaction about that now either,” Gronkowski said. “I can tell you this, I’m in great spirits and I’m enjoying life a lot more. I can tell you that right there.”