ii_skyimage

ii_skyimage deconvolves shadowgrams in the given energy bands. The index of deconvolved and cleaned images is written to ISGR-SKY.-IMA-IDX Data Structure. For each output energy band defined four images are created and attached to this index.The content of this Data Structure is given in the Table .

Table: Content of ISGR-SKY.-IMA-IDX Data Structure.

Column Name	Description
IMATYPE	Type of image. Possible values are: ``IMAGE'' - deconvolved and cleaned sky image ``VARIANCE'' - variance image ``SIGNIFICANCE'' - significance map ``RESIDUAL'' - difference between raw (deconvolved only) and cleaned image. ``EXPOSURE'' - true exposure map can be created.
CHANMIN	Lowest channel of the energy range
CHANMAX	Highest channel of the energy range
E_MIN	Lower bound of the energy range
E_MEAN	Mean energy of the energy range
E_MAX	Upper bound of the energy range
TFIRST	Time of the first data element
TLAST	Time of the last data element
TELAPSE	Total elapsed time of the data
EXPOSURE	Effective exposure time
CRVAL1	LONG at the reference value
CRVAL2	LAT at the reference value

For each deconvolved image the list of found sources is created (Data Structure ISGR-SKY.-RES) and attached to the ISGR-SKY.-RES-IDX Data Structure. See content of these Data Structures in Tables , .

Table: Content of ISGR-SKY.-RES Data Structure.

Column Name	Description
NEW_SOURCE	New source flag (0 if old, 1 if new)
SOURCE_ID	ISDC unique source identifier
RA_OBJ	Source right ascension in degrees
DEC_OBJ	Source declination in degrees
Y_FIN	Y axis fine position of the source in pixels
Z_FIN	Z axis fine position of the source in pixels
FIN_YZ_ERR	Error of the fine position along the Y and Z axis in pixels
RA_FIN	Right Ascension of the fine position of the source
DEC_FIN	Declination of the fine position of the source
FIN_RD_ERR	Error of the fine position of the source in RA and DEC, derived from source S/N (https://arxiv.org/pdf/1302.6915.pdf)
FLUX	Flux values for a given energy band
FLUX_ERR	Flux errors for a given energy band
DETSIG	Source detection significance in ISGRI

Table: Content of ISGR-SKY.-RES-IDX Data Structure.

Column Name	Description
TFIRST	Time of the first data element
TLAST	Time of the last data element
TELAPSE	Total elapsed time of the data
E_MIN	Lower bound of the energy range
E_MAX	Upper bound of the energy range

Search for the sources in the FOV is then performed and a list of sources found is created (Data Structure ISGR-MOSA-RES has the same structure as the ISGR-SKY.-RES, Table). The index of lists of sources found in each map can be found in Data Structure ISGR-MOSA-RES-IDX (structure analogous to the one described in the Table ).

The output catalog containing the sources description is written to the data structure ISGR-SRCL-RES. This Data Structure has structure similar to input catalog ISGR-SRCL-CAT. Each row of this Data Structure contains the description of a source in the OG FOV. If it was present in the input catalog all the input info is copied. For each source found during the analysis the new info is added, see Table

The DETSIG in ISGR-SRCL-RES is calculated from the results of the mosaic image and the results of the analysis at Science Window level as a quadratic summation of individual :

detsig = sqrt(sum detsig_i^2),

where i is for all energy bands and all Science Windows and mosaic image

For the flux and flux_err of ISGR-SRCL-RES you have:

flux = sum(flux_i) / N

flux_err = sum(flux_err_i) / N

where i is for all Science Windows and the mosaic image of a given energy band.

Table: New information added to the ISGR-SRCL-RES Data Structure.

Column Name	Description
RA_FIN	Right Ascension of the fine position of the source
DEC_FIN	Declination of the fine position of the source
FIN_RD_ERR	Error of the fine position of the source in RA and DEC
SCW_NUM_C	number of times that the source was in ScW FOV If SCW_NUM_C = 0 then it is a new source
SCW_NUM_F	number of times that the source was found in ScW image
OG_NUM	number of times that the source was found in OG image

With the help of stand alone program src_collect it si possible to collect results from different science windows. Results are written to the ISGR-OBS.-RES Data Structure, see Table .

Table: Content of the ISGR-OBS.-RES Data Structure.

Column Name	Description
SWID	Science Window identifier
SOURCE_ID	ISDC unique source identifier
NAME	One commonly used name for the source
RA_FIN	Source right ascension in degrees
DEC_FIN	Source declination in degrees
FIN_RD_ERR	Error of the fine position of the source in RA and DEC
Y_FIN	Y axis fine position of the source in pixels
Z_FIN	Z axis fine position of the source in pixels
FIN_YZ_ERR	Error of the fine position along Y and Z axis in pixels
DETSIG	Source detection significance in ISGRI
E_MIN	Lower energy boundaries
E_MAX	Upper energy boundaries
FLUX	Flux values
FLUX_ERR	Flux errors
DEADC	Mean deadtime (and greyfilter) correction factor
EXPOSURE	Mean exposure time over the detector plane
TSTART	Start time of the observation (IJD)
TSTOP	End time of the observation (IJD)