Subject: [SLR-Mail] No.2505: Succesfull Grace Follow On 1 and 2 pass from Potsdam station From: Sven Bauer Author: Sven BauerDear ILRS colleagues,we just had our first succesfull Grace Follow On Pass (24th of May 2018 @ 22:17 UTC) and even received returns from both satellites as they were passing over Potsdam station. As the GPS receivers are now switched on, the predicitions are already quite accurate, even so shortly after the launch. So the timebiases were very small and around-0.3 ms for GFO1and+0.5 ms for GFO2.Since the orbit quality is so good already, laser tracking shoud be feasible now. Good luck with that!BestSven Bauer-- Dr.-Ing. Sven BauerSection 1.2 Global Geomonitoring and Gravity Field,Earth System Parameters and Orbit Dynamics,POT3 Satellite Laser Ranging StationPhone:          +49 331 288 1738Fax:            +49 331 288 1169E-mail:         sven.bauer@gfz-potsdam.de___________________________________Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences Foundation under public law of the federal stateof BrandenburgTelegrafenberg, D-14473 Potsdam