1. XMM-Newton 1 M.Stuhlinger/P.Calderon, ESAC Re-appearance of the MOS1 CCD1 meteorite column during revs. 1792-1801 Madrid, 23. March 2010

2. XMM-Newton 2 M.Stuhlinger/P.Calderon, ESAC Review: Initiation ●Presumably micro-meteorite impact into MOS1 in rev. 0961. Anomaly frame [energy]Subsequent frame [energy]

3. XMM-Newton 3 M.Stuhlinger/P.Calderon, ESAC Review: Impact on hardware ●CCD6 inactive. ●Damaged pixels in CCD1 causing hot column close to boresight. 602 RAWY 539 11 dead pixels: RAWX 323 RAWY 567-577 First diagnostic exposure taken in rev. 0961: CCD1 detail New hot column RAWX 323: 3 (9) pixels next to pn (RGS) prime boresight position

4. XMM-Newton 4 M.Stuhlinger/P.Calderon, ESAC Review: Corrective actions ●Investigated meteorite column offset in FF, LW and SW mode diagnostics: Same increased column offset (by ~19 ADU) measured for all imaging modes. ●Investigated impact of meteorite column offset for science observations: Calibration line energies in calclosed observations were shifted by ~20 ADU. Similar offset as in diagnostic exposures. Thus just an additive offset. ●Correction can be done by changing of onboard-offset table to make the meteorite column available for science again.

5. XMM-Newton 5 M.Stuhlinger/P.Calderon, ESAC Review: Monitoring of column offset ●Regular FF, LW and SW diagnostic exposures in routine calibration. Column offset showed exponential long term decay. ●On-board offset table value decreased by 10 ADU (123 =>113 ADU) after ~600 revolutions (active since rev. 1690). Topic of this talk

6. XMM-Newton 6 M.Stuhlinger/P.Calderon, ESAC Re-appearances since on-board offset table change ●Detections usually by Blanca Juárez (last remaining InsCon). ●During first eclipse phase after correction in single observations. (revs.1122-1130). ●Few single observations, e.g. slew 9152300002. ●Short phase in revs. 1537+1538. Offset in on-board table decreased (~rev.1690). ●After change, column was mostly hot in revs. 1698-1701. ●Longer phase in revs. 1792-1801.

7. XMM-Newton 7 M.Stuhlinger/P.Calderon, ESAC Trend during re-appearance in revs. 1792-1802 ●Diagnostic exposures to measure the column offset during a “hot phase” are only available for latest occurrence due to coincidence with routine calibration observation in rev. 1796 (Capella). 500 sec bins

8. XMM-Newton 8 M.Stuhlinger/P.Calderon, ESAC First diagnostics during re-appearance ●Diagnostics in routine cal. observation 1796-0510780401 (Capella): column offset about 7 ADU higher (119 ADU) than expected by the decay model (112 ADU).

9. XMM-Newton 9 M.Stuhlinger/P.Calderon, ESAC Detection due to telemetry anomaly ●Independent notification of hot meteorite column by Pedro Calderon via strange behaviour of MOS1 telemetry, e.g. in rev.1800. ●MOS1 telemetry showed flares whereas MOS2 telemetry was constant. ●Meteorite column is cause of telemetry anomaly.

10. XMM-Newton 10 M.Stuhlinger/P.Calderon, ESAC Frequency search in SW obs.1800_0412600801 ●Except readout time and its harmonics, no significant frequency was found inside the data. 0.3 s = readout Harmonics of readout frequency

11. XMM-Newton 11 M.Stuhlinger/P.Calderon, ESAC Frequency search in FF obs.1798_0605580601 ●Column modulation at long timescales or feature of harmonics? 2.6s = readout 1000 x readout

12. XMM-Newton 12 M.Stuhlinger/P.Calderon, ESAC Summary ●If the meteorite column appears hot, it is due to increase of the column offset. ●No time correlation was found for frequencies higher f>0.01 Hz. ●Possible correlations at very low frequencies, might be just features in harmonics of light curve binning/readout frequency harmonics(?). Still open questions: ●Why does the meteorite column occasionally re-appears hot for some observations / time periods? ●What causes the (short term) variation of the column offset?

13. XMM-Newton 13 M.Stuhlinger/P.Calderon, ESAC Future…