All: GRIM2 has failed for the second time in little more than a month. The failure mode is the same (or similar to) the "missing quadrant" symptom that has been intermittently manifest off-and-on now for several years. Our ability at the site to effect "swap and pray" remedies for this mysterious problem is pretty much exhausted. We have asked Al Harper and the engineering staff at Yerkes to work with us to find out the root cause of these failures. We hope to have more to report on the the diagnosis and prognosis of the instrument in the coming days or weeks. In the meantime, we are taking GRIM2 out of service until further notice. PIs of near-term GRIM2-using programs are being notified separately. If you are a GRIM2 user during November, you may consider using other instruments for TAC-approved observing. If you cannot use your time with another instrument, please contact your institutional scheduler, who should then contact Ed Turner with an alternative program. Users with GRIM2 time in December should not yet replan their programs, but should stay alert for upcoming announcements. Bruce Gillespie (for Ed Turner) APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 719 in the apo35-general archive. You can find APO the archive on http://www.astro.princeton.edu/APO/apo35-general/INDEX.html APO To join/leave the list, send mail to apo35-request@astro.princeton.edu APO To post a message, mail it to apo35-general@astro.princeton.edu APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO