2011-05-18
===========

In response to the ticket issued today (see attached) about problem
with ISAAC detector I checked the data from previous nights (and
daytime calibrations). Here is a quick report:

Checking data from 2011-05-17/18 night
-------------------------------------

So far (~1 pm local Garching time) only LW observations

Checking data from 2011-05-16/17 night
-------------------------------------
ISAAC.2011-05-17T06:09:17.083.fits SP_FLAT  OK
ISAAC.2011-05-17T06:11:07.659.fits    ''    OK
ISAAC.2011-05-17T06:52:24.524.fits    ''    OK

Random check on the science data (SW spectroscopy only) shows no apparent problem

ISAAC.2011-05-17T10:35:05.912.fits    IM_DARK (first SW daytime) OK
ISAAC.2011-05-17T10:37:23.896.fits    IM_DARK (first SW daytime) OK
ISAAC.2011-05-17T10:39:41.882.fits    IM_DARK (first SW daytime) OK

ISAAC.2011-05-17T10:42:04.772.fits    IM_DARK  (daytime) OK

ISAAC.2011-05-17T11:04:50.470.fits    IM_DARK (daytime) full, but strange bright ray-like structure in the upper-left corner
ISAAC.2011-05-17T11:15:31.304.fits    IM_DARK (daytime) full, but strange bright ray-like structure in the upper-left corner
ISAAC.2011-05-17T11:26:12.097.fits    IM_DARK (daytime) full, but strange bright ray-like structure in the upper-left corner
ISAAC.2011-05-17T11:36:59.686.fits    IM_DARK full, but some ray-like structure in the upper-left corner
ISAAC.2011-05-17T11:40:54.639.fits    IM_DARK full, but some ray-like structure in the upper-left corner

ISAAC.2011-05-17T11:42:58.914.fits    IM_DARK full, but some ray-like structure in the upper-left (UL) corner
ISAAC.2011-05-17T12:06:05.967.fits    IM_DARK full, but some ray-like structure in the upper-left (UL) corner

ISAAC.2011-05-17T12:18:38.671.fits    SLIT_IMG BAD, whole UL quadrant missing; bright sources at the edges
ISAAC.2011-05-17T12:20:33.733.fits  SP_FLAT (daytime) BAD
ISAAC.2011-05-17T12:32:30.942.fits  SP_ARC (daytime)  BAD


Checking data from 2011-05-15/16 night
-------------------------------------

ISAAC.2011-05-16T20:29:27.592.fits    SLIT_IMG  OK
ISAAC.2011-05-16T20:33:03.333.fits    SW_CHECK_FLAT  OK

It looks like the first case when the signal in the whole upper-left
(UL) quadrant of the SW array was lost happened at around
011-05-17T12:18, i.e. during day-time calibrations of previous night,
when observations were switched from darks to slit image. It was
proceeded by appearance of a strange ray-like structure in the UL
corner.

We are still waiting for the full set of the frames from last night to
be transferred here, to Garching.  Once they arrive I will check them
too.

################################################################
 Entry-Id                  : USD-35935
 Email Address             : melipal@eso.org
 Status                    : Open
 First Name                : Fernando
 Last Name                 : Selman
 Priority                  : 3
 Short-Description         : ISAAC SW detector woes
 Problem Description       :
     05/18/11 00:58:32     esoarspl
        Dear ISAAC QC scientist,

           This morning, at approxinately 08AM chile time, the SW
           Hawaii detector of ISAAC showed 0 signal in one of the
           quadrants. We could not complete the day calibrations. It
           appears to be a serious problem. Although the problem
           became obvious this morning we are not sure if it was
           present, in a more subtle form before. Please check
           carefully the data quality of the last few nights to make
           sure that they have not been affected.

           Thanks!

           Fernando J. Selman
 Task                      : Paranal Operations
 inst/sub task             : General
 Assignee                  : qc_isaac
 Worklog                   :
 Create-date               : 05/18/11 00:58:32
 Last-modified-by          : smysore