XMM-Newton Data Files Handbook

6.1 Event list structure in the MOS Imaging Mode

The MOS Imaging Mode event file produced by emproc is named

REVN_OBSID_EMOS$[$1,2$]$_SEEE_ImagingEvts.ds

with REVN the 4-digit revolution number, OBSID the 10-digit observation ID, and EEE the exposure number. It has the following extensions:

• 1 PRIMARY extension, which contains no data

• 1 EVENT extension, which contains all the events which have passed the non-destructive filters of the reduction procedures/algorithms

• 1 OFFSETS extension, which contains column and row offset values of patched offsets (as applied through the on-board offset table) or anomalous offsets (e.g., as a result of bit flips in the EDU memory or other serendipitous events) as determined by the SAS event processing.

• 7 EXPOSU$0n$ extensions (one for each chip; $n\,=\,1, 2, ..., 7$), which contain the exposure fractions (0-1) for each chip as a function of time. In timing mode, chip #1 is used for timing, and only extensions $n\,=\,2, ..., 7$ are present.

• 7 BADPIX$0n$ extensions (one for each chip; same as for EXPOSU$0n$), which contain a map of the bad pixels, with some associated properties

• 1 CALINDEX extension, which contains the CIF employed to reduce the data

• 7 STDGTI$0n$ extensions, which contain the Good Time Intervals (GTIs) applied to produce the event list. $n$ as for EXPOSU$0n$

• In addition, any number of extensions GTI$00n$ZZ may be included in the evens file, written by any non-standard time filtered expression, mainly in evselect. $n$ is the same as for EXPOSU$0n$ but starting at 0, thus $n\,=\,0, 1, ..., 6$.
  ZZ is a sequence number in the Data Subspace corresponding to a TIME filter expression. If the event list was filtered using more than one TIME expression, consecutive GTI extensions are added starting with ZZ=02, thus $00n$02, $00n$03, etc...

An overview of the columns in each of the above extensions is given in Table 31.

Table 31: MOS Imaging Mode event list column

Name	Units	Description
BINTABLE EVENT
TIME	SECONDS
RAWX	PIXELS	Event X coordinate as measured by the detector
RAWY	PIXELS	Event Y coordinate as measured by the detector
DETX	0.05 ARCSECONDS	Linearised X detector coordinate
DETY	0.05 ARCSECONDS	Linearised Y detector coordinate
X	0.05 ARCSECONDS	Sky X detector coordinate
Y	0.05 ARCSECONDS	Sky Y detector coordinate
PHA	CHANNELS	Pulse-Height-Analyser (uncalibrated spectral channel)
PI	CHANNELS	Pulse-Invariant (calibrated spectral channels)
FLAG
PATTERN		Event pattern
CCDNR		CCD identifier (1-7)
BINTABLE OFFSETS
RAWX	PIXELS	Row/Column# of offset (if OFFSET-Y/X$> 0$)
OFFSETX	CHANNEL	Column offset value (0 if row offsets) in ADU
OFFSETY	CHANNEL	Row offset value (0 if column offsets) in ADU
CCDNR		CCD identifier (1-7)
BINTABLE EXPOSU$0n$
TIME	SECONDS	Frame central time
TIMEDEL	SECONDS	Frame integration time
FRACEXP	FRACTION	Effective time fraction
BINTABLE BADPIX$0n$
RAWX	PIXEL	Bad pixel X-coordinate
RAWY	PIXEL	Bad pixel Y-coordinate
TYPE		1: Hot 2: Flickering 3: Dead
YEXTENT	PIXEL	# of pixel in y column
BADFLAG		1: uplinked bad pixels; 2: CCF origin; 3: file origin
BINTABLE CALINDEX
TELESCOP		XMM
SCOPE		EMOS[1,2], EPN, RGS[1,2], OM, XRT[1,2,3], XMM
TYPEID		CCF constituent type
ISSUE		Issue number
VALDATE		Start of validity date
VALDATE-END		End of validity date
FNAME		Name of applied calibration file
DATE		Production date of calibration file
FSIZE		File size (bytes)
SUBDATE		Submission date
EXTSEQU		Extension sequence
EXTSEQUID		Extension sequence identifiers
MD5		MD5 signature of constituents
CREATOR		CCF constituent creator
BINTABLE STDGTI$0n$
START		GTI start time
STOP		GTI stop time
BINTABLE GTI$00n$ZZ		only if additional time filters applied
START		GTI start time
STOP		GTI stop time