Subject: BTI and bad SCWs Dear All, as most of you already know, we have had two recent events with JEM-X1 in which the high voltage supply was suddenly switched down a step without any preceeding STANDBY period. Unfortunately, j_cor_gain which fits the gain over a whole revolutions, was not able to fit these two revolutions correctly (239 and 260) which means we have some bad time intervals around the switching points. This change in procedure (i.e. sudden high voltage switches without using standby) will be covered in the version of j_cor_gain delivered for OSA 5.0, and people using rev_2 or other archived data will have to re-perform the gain corrections for JEM-X1 data in these revolutions. Until then, the following time periods should be regarded as bad: 1731.92 to 1732.69 (IJD) Rev. 239 1733.86 to 1734.00 (IJD) Rev. 239 1796.31 to 1796.43 (IJD) Rev. 260 These time periods correspond to the following science windows: 023900190010 023900190021 023900200010 023900200021 023900210010 023900210021 023900220010 023900220021 023900230010 023900230021 023900240010 023900240021 023900250010 023900250021 023900260010 023900260021 023900270010 023900270021 023900280010 023900280021 023900290010 023900290020 023900290030 023900290041 023900300010 023900300021 023900310010 023900310021 023900320010 023900320021 023900330010 023900330021 023900340010 023900340021 023900350010 023900350021 023900360010 023900360021 023900370010 023900370021 023900380010 023900380021 023900390010 023900390021 023900400010 023900400021 023900410010 023900410021 023900420010 023900420021 023900430010 023900430021 023900440010 023900440021 023900450010 023900450021 023900460010 023900460021 023900470010 023900470021 023900950021 023900960010 023900960021 023900970010 023900970021 023900980010 023900980021 023900990010 023900990021 023901000010 023901000021 023901010010 023901010021 023901020010 023901020020 023901020031 023901030010 023901030021 023901040010 026000610021 026000620010 026000620021 026000630010 026000630021 026000640010 026000640021 Best wishes, Carol Anne .DANISH.SPACE.RESEARCH.INSTITUTE.DANISH.SPACE.RESEARCH.INSTITUTE.DANISH. Dr. Carol Anne Oxborrow Email: oxborrow@dsri.dk Homepage: http://www.dsri.dk/~oxborrow Telephone (direct): +45 35 32 57 33 Telephone (secretary): +45 35 32 57 01 Fax: +45 35 36 24 75