RT @Seb_Guillot@twitter.com
New paper: The 2nd slowest pulsar, 12.1 sec spin period, discovered by the SUPERB radio survey, near the pulsar death-line, close to other known X-ray emitting isolated neutron stars...But no X-ray are seen from this one in NICER or Swift observations. It remains a mystery :-) https://twitter.com/arXiver/status/1182145112807108610