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James Webb Space Telescope User Documentation



JWST's MIRI Anneal Engineering template, available in the Astronomer’s Proposal Tool (APT), is used for calibration observations for the MIRI instrument.   


This parameter is required to obtain Anneal observations. Note that this type of observation can be obtained as a parallel to normal science observations.

Detector anneals will be performed to treat cosmic ray damage. During the anneals, the specified MIRI detector will be heated up to ~15-20K above its nominal operating temperature and MIRI will not be usable.

MIRI Anneal observations should be executed back to back with a follow-on MIRI observation. These observations should be linked with an AFTER OBSERVATION BY special requirement with a MIN INTERVAL of at least 10 minutes longer than the duration of the Anneal, and the EXCLUSIVE USE OF INSTRUMENT flag set. For multiple MIRI Anneal observations, the anneals should be linked with a SEQUENCE OBSERVATION special requirement with the NON INTERRUPTIBLE flag set and a final MIRI observation in the sequence must have the AFTER OBSERVATION BY special requirement as mentioned above.

Note to developer: If MIN INTERVAL of the AFTER OBSERVATION BY special requirement is not at least 10 minutes longer than the duration of the anneal, and the EXCLUSIVE USE OF INSTRUMENT flag is not set, give a warning.

Note to developer: This type of observation is expected to be done in parallel with a slew, so the PARALLEL SLEW ONLY special requirement will be added by default. It can be removed, but that will be a warning. During commissioning this template will likely be executed as a prime.

The MIRI Anneal Engineering template consists of the following parameters:

General Information 
 Observation Numberassign observation numbernumber
 Observation Label provide observation labeltestoptional
 Observations Comments  provide observation commentstestoptional
Special Requirementsspecify special requirementschoose from listif needed
Template Specific Information
Detectorselect detectorchoose from list

General Information 



This parameter specifies the detector that is to be used.

Change log

 Click here to expand...

Version 5 (April 18, 2019)

  1. Editorial change (moved change log to main article).

Version 4 (March 18, 2019)

  1. PROPINSTJWST-91376 - Chapter 19.4: Changes to MIRI Anneal template for JT-assisted anneal

Version 3 (October 2, 2018)

  1. PR 90377 - Updated text in Introduction section to clarify visit duration in AFTER link, and sequence of anneals.

Version 2 (December 27, 2017)

  1. PR 83433 - added text about required follow-on observation
  2. PR 83433 - added developer note about adding NO PARALLEL requirement
  3. PR 83433 - added Temperature Setpoint parameter

Version 1 (November 07, 2016)

This is the converted Word File from Chapter 19.


JWST MIRI Anneal Template

JWST MIRI Anneal template parameters

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Boldface italics type indicates the name of an APT parameter or a value for a parameter.

Green text indicates the name of the parameter used by Commanding. 

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JWST Proposal Parameters

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