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

Objective

To obtain a 24, 70 and 160 micron Routine MEDIUM rate Scan Flatfields and ICs.

Description

We will obtain IOC acceptable routine 24um, 70um and 160um medium rate SCAN mode flatfields and ICs (this task is repeated a number of times in different campaigns) to be used on a regular basis. This activity is a companion to the routine PHOTOMETRY flatfield tasks and routine fast SCAN flatfield tasks. These activities will allow us to determine the relative efficiency and quality of flatfields created using scan and photometry AORs.

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 flatfield or saturation. This task will also be useful for screening regions of the sky to obtain flatfields in SIRTF routine operations.

This task is executed in:

    MIPS Campaign V
    MIPS Campaign X3
    MIPS Campaign M001

Data Collected

A 1 degree long 2 legs) scan map will be obtained using the MEDIUM scan AOT in a region of the sky chosen to avoid bright point sources. The images to be median combined to produce a 24 um flat and 70 and 160um ICs. The map will require about 33 minutes of observing time.



#  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     11:57:42

HEADER: FILE_VERSION=7.0, STATUS = PROPOSAL

      AOT_TYPE:  MIPS Scan Map
     AOR_LABEL:  MIPS-941-Oct28-Dec08-leading
    AOR_STATUS:  new

 MOVING_TARGET:  NO
   TARGET_TYPE:  FIXED SINGLE
   TARGET_NAME:  zodi_29b-offset1
  COORD_SYSTEM:  Equatorial  J2000
      POSITION:  RA_LON=22h32m31.83s,  DEC_LAT=-16d27m23.6s
OBJECT_AVOIDANCE:  EARTH = YES, OTHERS = YES

    REQUIRE_160: YES
      SCAN_RATE: medium
 FAST_RESET_160: NO
      STEP_SIZE: TURNAROUND=302", FORWARD=0"
    N_SCAN_LEGS: 2
   N_MAP_CYCLES: 1
SCAN_LEG_LENGTH: 1.0
MAP_CENTER_OFFSET: CROSS_SCAN = 0, IN_SCAN = 0
SPECIAL: IMPACT = none, LATE_EPHEMERIS = NO,SECOND_LOOK = NO
RESOURCE_EST: TOTAL_DURATION=1961.95, SLEW_TIME=20.6, SETTLE_TIME=45.75, SLEW_OV
ERHEAD=180.0, SPECIAL_OVERHEAD=0.0, UPLINK_VOLUME=691, DOWNLINK_VOLUME=35791334,
 VERSION=S8.9.0
INTEGRATION_TIME: MIPS_24=41.9,MIPS_70=41.9,MIPS_160=4.2

Data Reformatting Requirements

Array Data Desired:

All Arrays

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 region. This may be useful for IRS to select their own flatfield regions.

24micron flatfield and 70 and 160micron ICs obtained in Medium rate SCAN mode.

A star observed at a grid of positions across the array will be flatfield to check the quality of the flatfield. 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.
Produce a mosaics of the observed region using MIPS_ENHANCER. This will be used to look for bright sources and/or saturated regions.
Median combine images obtained at all three wavelengths (with some rejection algorithm) using mips_enhancer to create flatfields and ICs.
Flatfield star observations at different positions across the array.
Aperture photometry on star using the IRAF "phot" task to measure flux
Comparison of star aperture photometry at different positions across the array to determine flatfield accuracy.
Once the task is executed more than once:

we can look for possible flatfield/IC variations with time/region of sky used
we can determine the number of DCEs necessary to construct a 'super' flatfield/IC.

We will carry out a detailed comparison between flatfields/ICs created in photometry and scan (at different rates) modes.

Software Requirements

DAT
IRAF
IDL

Actions Following Analysis

If the flatfield S/N and quality requirements are met, then the flatfield/IC frame will be put in the calibration data archive.

Failure Modes and Responses

If region of the sky used is saturated at one or more wavelengths, this region will be removed from the list of flatfield regions (Jeonghee Rho's list of flatfield regions), as ideally we would like to use the same region of the sky to obtain flatfields and ICs at all three wavelengths.