INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE SERVICE DE LA ROTATION TERRESTRE OBSERVATOIRE DE PARIS 61, Av. de l'Observatoire 75014 PARIS (France) Tel. 33 (0) 1 40 51 23 35 http://iers.obspm.fr email: services.iers@obspm.fr Paris, 18 August 2018 Bulletin D 138 ANNOUNCEMENT OF DUT1 From the 21 September 2018, 0h UTC until further notice, the value of DUT1 to be disseminated with the time signals will be DUT1 = +0.0 s Bulletin D 139 should be issued in January 2019 To unsubscribe: http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletin_registration.html