I also had flight radar up almost instantly and there was nothing nearby. Sound source was distinctly traveling to the west, not south towards MHT. FedEx and UPS are very good about always showing up on radar. Whatever the noise came from was traveling much faster, but also lingered far longer. Thought it was thunder initially, but it kept resonating and rumbling. Maybe meteorite or other space debris burning up in atmosphere?
Similar reporting in this thread https://www.reddit.com/r/newhampshire/comments/11sejvx/wtf_just_landed_at_pease/