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Principal: Almudena Alonso
Deputy: David Frayer
Data Monkey(s): Almudena Alonso, David Frayer, Eiichi Egami
Priority:
Downlink Priority: Normal
Analysis Time: 24-48hours
Last Updated:

Objective
Determine the illumination correction for the70um NARROW FIELD mode.

Description

We will obtain an IOC acceptable NARROW FIELD 70micron mode ICs to be used on a regular basis.
Since this task is repeated a number of times during IOC, we will observe different regions of the sky each time. The task will check for possible variations of quality of IC or saturation. This task will also be useful for screening regions of the sky to obtain ICs in narrow field mode during SIRTF routine science operations.

This task is executed in:

    MIPS Campaign G
    MIPS Campaign I (twice)
    MIPS Campaign J
    MIPS Campaign K
    MIPS Campaign P
    MIPS Campaign V

Data Collected
A 70micron narrow-field photometry cluster-target AOR (2x3, with 300 arcsec offsets) is specified with 3 second DCEs and 6 pointings in a rectangular pattern for a region of sky free of bright 70micron point-sources. This observation will require about 22.5 minutes of observing time.
This is how the AOR file overlaid on the sky looks.
#  Please edit this file with care to maintain the
#  correct format so that SPOT can still read it.
#  Generated by SPOT on:  8/15/2002     14:39:2

HEADER: FILE_VERSION=6.1, STATUS = PROPOSAL

      AOT_TYPE:  MIPS Photometry
     AOR_LABEL:  MIPS-313-Feb10-Mar25
    AOR_STATUS:  new

 MOVING_TARGET:  NO
   TARGET_TYPE:  FIXED CLUSTER - OFFSETS
   TARGET_NAME:  MIPS-313-Feb10-Mar25
  COORD_SYSTEM:  Equatorial  J2000
     POSITION1:  RA_LON=5h31m20.79s,  DEC_LAT=+3d15m00.6s
     OFFSET_P2:  EAST_ARRAY_V=0.0",     NORTH_ARRAY_W=-300.0"
     OFFSET_P3:  EAST_ARRAY_V=300.0",   NORTH_ARRAY_W=-300.0"
     OFFSET_P4:  EAST_ARRAY_V=300.0",   NORTH_ARRAY_W=0.0"
     OFFSET_P5:  EAST_ARRAY_V=300.0",   NORTH_ARRAY_W=300.0"
     OFFSET_P6:  EAST_ARRAY_V=0.0",     NORTH_ARRAY_W=300.0"
OFFSETS_IN_ARRAY:  NO
OBSERVE_OFFSETS_ONLY:  NO
OBJECT_AVOIDANCE:  EARTH = YES, OTHERS = YES

    MICRON_70: IMAGE_SCALE = FINE, FIELD_SIZE = SMALL, EXPOSURE_TIME = 3, N_CYCL
ES = 1
SPECIAL_OVERHEAD: IMPACT = none, LATE_EPHEMERIS = NO
RESOURCE_EST: TOTAL_DURATION=1107.4648, SLEW_TIME=42.4, SETTLE_TIME=76.76486, SL
EW_OVERHEAD=180.0, SPECIAL_OVERHEAD=0.0, UPLINK_VOLUME=3296, DOWNLINK_VOLUME=858
9372, VERSION=S6.0.0
INTEGRATION_TIME: MIPS_24=0.0,MIPS_70=25.165825,MIPS_160=0.0

COMMENT_START: 

COMMENT_END: 
Data Reformatting Requirements
Array Data Desired:
70 µm
Data Reformatting Option:

NORMAL

1 FITS file per AOR per array.

Special Instructions:

Task Dependencies

CAID and title of Precedent Task #1 (or None)

etc.

Calibration Dependencies

Dark

Output and Deliverable Products
Mosaic of the observed field.
70micron IC obtained in NARROW FIELD mode.

An IC will be applied to a star observed in super-resollution mode at different positions across the array to check the quality of the IC. We will provide an array map showing the location dependences -if any- of the photometric sensitivity.

Data Analysis

Standard Pipeline reduction using the DAT and/or SSC Pipeline. If using the DAT, we will run MIPS_SLOPER and then we will do the dark subtraction with MIPS_CALER.

Produce a mosaic of the observed region using MIPS_ENHANCER.

Median combine images (with some rejection algorithm) using the IRAF "imcombine" task to create an IC. Alternatively, once the IC DCEs are screened for possible saturation, etc, we can use the MIPS_ENHANCER to create the flatfield frame using an appropriate rejection algorithm.

Apply IC to star observations at different positions across the array. We will use observations 70micron NF Focal Plane Survey: MIPS-137 (campaings I and J) and MIPS-138 (campaign V).

Aperture photometry on star using the IRAF "phot" task to measure star flux. We will use the tasks: photpars, fitskypars to set up the photometry parameters (aperture, sky/background estimate). The optimal parameters will be determined once we obtain the data.

Comparison of star aperture photometry at different positions across the array to determine IC accuracy.

Software Requirements

DAT

IRAF

IDL

Actions Following Analysis
If the IC S/N and quality requirements are met, then the IC frame will be put in the calibration data archive.
Failure Modes and Responses
If region of the sky used is saturated, this region will be removed from the list of flatfield/IC regions (Jeonghee Rho's list of flatfield/IC regions). This task is repeated a number of times with different regions of the sky, so it should be possible to obtain 70micron ICs. If regions used are all saturated,we will look for different regions of the sky.
Additional Notes