1. XMM-Newton 1 M.Stuhlinger, ESAC MOS1 Timing Mode noise echo of the meteorite column Madrid, 23. March 2009

2. XMM-Newton 2 M.Stuhlinger, ESAC Discovery history: During analyses of MOS1 timing mode exposures. My MOS1 timing mode spectrum of highly absorbed source 1E1740.7- 2942 looks very different to MOS2/pn at low energies. Same spectrum extracted by Carlos Gabriel agrees with MOS2 and does not show low energy features.

3. XMM-Newton 3 M.Stuhlinger, ESAC Different spectra extractions cause different appearance

4. XMM-Newton 4 M.Stuhlinger, ESAC Discovery history: During analyses of MOS1 timing mode exposures. My MOS1 timing mode spectrum of highly absorbed source 1E1740.7- 2942 looks very different to MOS2/pn at low energies. Same spectrum extracted by Carlos Gabriel agrees with MOS2 and does not show low energy features. Where do “my” low energy counts come from? Columns 320-327 show noise component shifted to lower energies with increasing RAWX.

5. XMM-Newton 5 M.Stuhlinger, ESAC 1E1740.7-2942

6. XMM-Newton 6 M.Stuhlinger, ESAC 1E1740.7-2942 RAWX320RAWX321RAWX323RAWX324RAWX325RAWX322

7. XMM-Newton 7 M.Stuhlinger, ESAC Discovery: During analyses of MOS1 timing mode exposures. My MOS1 timing mode spectrum of highly absorbed source 1E1740.7- 2942 looks very different to MOS2/pn at low energies. Same spectrum extracted by Carlos Gabriel agrees with MOS2 and does not show low energy features. Where do “my” low energy the counts come from? Columns 322-325 show noise component shifted to lower energies with increasing RAWX. Why the difference? We both exclude the hot column RAWX=319. Carlos used RAWX [300:316] (left PSF wing only), I used RAWX [300:317] or [321:330] (both PSF wings with gap).

8. XMM-Newton 8 M.Stuhlinger, ESAC 1E1740.7-2942 6 pixels to be ignored

9. XMM-Newton 9 M.Stuhlinger, ESAC MOS1 1E1740.7-2942 (rev.1065): PI versus RAWX RAWX 323 RAWX 322 RAWX 324 RAWX 325 RAWX 321 RAWX 319 RAWX 320 RAWX PI

10. XMM-Newton 10 M.Stuhlinger, ESAC MOS1 Swift J1753.5-0127 (rev.1152): PI versus RAWX RAWX 323 RAWX 322 RAWX 324 RAWX 325 RAWX 321 RAWX 319 RAWX 320 RAWX PI

11. XMM-Newton 11 M.Stuhlinger, ESAC MOS1 4U0142+61 (rev.1300): PI versus RAWX RAWX 323 RAWX 322 RAWX 324 RAWX 325 RAWX 321 RAWX 319 RAWX 320 RAWX PI

12. XMM-Newton 12 M.Stuhlinger, ESAC Conclusions: Noise echo of meteorite column in RAWX [320:325] is common feature in MOS1 timing modes. Most probable noise echo is created within serial readout process. For extraction of MOS1 timing mode spectra (Rev.>961): Better ignore RAWX [318:325] Large fraction of the right (higher RAWX values) PSF wing is lost! Already recommended: Avoid MOS1 observations in timing mode.