Analysis of startup, shutdown and middle sequences, Campaign 21b

Abstract:  We processed this short piece of Campaign 21 as a 
separate campaign.  The results are much like Campaign 21a
(and previous campaigns), with all SRSRN results within limits,
SL exceeding its SURN limit half the time, and LH exceeding
its SURN limit all of the time (18.3-19.7 DN).  SL showed some
variation in read-noise stability, but the other modules were
well behaved.  The photoresponse stability test revealed the
following misbehaving pixels:  In LL: (52,4), (76,13); and in
LH:  (120,41), (62,65), (67,66), (15,74), (84,114).

Analysts:  Lei Hao & Greg Sloan
Procedure version:  2.7
Campaign 21b, Startup, shutdown and middle anneal
YEAR 2005 DOY 148
CE1 used for all data collection
AORKEY =   13797888  for startup
AORKEY =   15347968  for shutdown
Number of files = 64 for each
No known errors.

Steps 2 through 5 run OK.

Unruly.pro results for startup (IRS-001):

    Noise characteristics of the modules (in DN)

            SUR data                SRS data
            noise   pre     post    noise   pre     post
    Module  limit   anneal  anneal  limit   anneal  anneal

    SL     8.8      8.0      9.5    15.0     12.4     12.3
    SH     8.8      6.8      6.7    15.0     12.9     12.8
    LL    14.5     13.6     12.0    15.0     13.0     13.1
    LH    17.6     18.4     18.3    15.0     13.1     13.1

Unruly.pro results for shutdown (IRS-003):

   Noise characteristics of the modules (in DN)

            SUR data                SRS data
	    noise   pre     post    noise   pre     post
    Module  limit   anneal  anneal  limit   anneal  anneal

    SL     8.8      7.2      9.0    15.0     12.2     12.4
    SH     8.8      6.8      6.7    15.0     12.7     12.9
    LL    14.5     13.5     12.7    15.0     12.9     12.9
    LH    17.6     19.7     18.7    15.0     13.2     13.2

    The analysis applied the PIRAT procedure unruly.pro to
    FITS files generated by MIPL.

    For SUR data, the quoted values are the standard deviation
    of the read noise map.  For SRS data, these are the median
    of the standard deviation map.

    Comments: The SRS noise results are all within the limit, 
    as usual.  All SH and LL SURN results are alsow within
    limits.  Two of the four SL SURN tests exceeded the limit,
    in both cases in the post-anneal data, and LH exceeded its
    SURN limit every time, with results between 18.3 and 19.7
    DN.
    
Changes in read noise from startup to shutdown 

            SUR data                        SRS data
	    pre-ann.  post-ann.  IRS-003/   pre-ann.  post-ann.  IRS-003/
    Module  IRS-003   IRS-001    IRS-001    IRS-003   IRS-001    IRS-001
                                                                     
      SL       7.25      9.54      0.76      12.23     12.26      1.00
      SH       6.77      6.72      1.01      12.72     12.79      0.99
      LL      13.54     11.97      1.13      12.89     13.12      0.98
      LH      19.65     18.26      1.08      13.25     13.15      1.01

    Comments:  The SRSRN tests all show stability within 2%.  
    The SL SURN stability result exceeds the yellow limit with a
    24% value, and LL showed a 13% variation.  The other modules
    were better behaved, with SH at 1% and LH at 8%.

Photoresponse stability:

             all pixels      masking dead    mask dead/warm
    module   yellow  red     yellow  red     yellow  red
    SL          6     6         0     0         0     0
    SH          4     1         0     0         0     0
    LL        366     7       361     2       358     2
    LH         22    13        15     6        12     5

    Comments:  Both SL and SH behaved well, with no pixels exceeding 
    yellow or red.  This hasn't happened to SL before and probably
    reflects the fact that the campaign was too short to accumulate
    any latent images.  In LL, the orders are clearly visible, as
    usual, and in LH, only the middle orders can be seen. 

    The pixels exceeding the red limit are:
    LL:  (52,4), (76,13)
    LH:  (120,41), (62,65), (67,66), (15,74), (84,114)