Q1: Where are the Webb Office Hours procedures and guidelines?
A1: Webb Office Hours. Type your question into the WebEx chat. We will asynchronously copy questions from the chat to this main page and work through them as a group. If you have images to share please give WebEx permission to share your screen (you may need to log out and log back in again to enable this feature.)
Q2: There is a question about the MIRI MRS PSF and using it to properly subtract the background(?). Imaging vs MRS PSF. Some issues with the dither combination.
A2: No need to apply the PHOTMJYSR correction manually, the data are already calibrated; to convert from surface brightness to flux density, just multiply by the pixel size in steradians. There was a suggestion to use WebbPSF, but it wasn't clear that the MIRI MRS is available (or accurate). Look at the level 2b products instead of the level 3 products (yes, this was sent to the help desk, and they did the combinations themselves, but it didn't make too much of a difference). Pointed to: https://www.aanda.org/articles/aa/pdf/2023/07/aa46489-23.pdf which is the calibration of the MRS and includes aperture correction values over the full MRS wavelength range. Talk again to the help desk; the person before really thought it was a masking issue.
Q3: Are submitted APT proposals available? Wants to know what parameters they used?
A3: If it is an accepted program, you can open in APT using "retrieve from STScI":
File>>Retrieve from STScI >>Retrieve Using Program ID
Q4: Artifacts in NIRCam Data. (Has submitted a help desk ticket). First one is in the F405 filter, 2 (half circular) circular artifacts. Looking at individual exposures subtracted from the median of the exposures. PID 1905 also has these artifacts
A4: NIRCam thinks these are scattered light features. Don't have an answer about the exact light path yet. The team are collecting examples of these and the other artifacts to determine the source. NIRCam will update the JDox known issues pages with more information soon: https://jwst-docs.stsci.edu/known-issues-with-jwst-data/nircam-known-issues/nircam-scattered-light-artifacts#gsc.tab=0
Q5: Question about NIRSpec. Does NSClean work on time series data?
A5: We need to check with the NIRSpec team and also suggested to follow up with a help desk ticket. Please note: NSClean is now implemented in the pipeline (v1.13.4 onwards) as a non-default option. Further details on how to invoke NSClean within the JWST Science Calibration Pipeline and adjust default parameters are described in the 1/f noise workaround notebook. https://jwst-docs.stsci.edu/known-issues-with-jwst-data/nirspec-known-issues/nirspec-ifu-known-issues#NIRSpecIFUKnownIssues-Correlated1/freadnoise.
NSClean can actually be run on NIRSpec BOTS data. Here is the example notebook on JDAT if it is any help https://github.com/spacetelescope/jdat_notebooks/blob/main/notebooks/NIRSpec/NIRSpec_NSClean/BOTS_NSClean_example.ipynb.
There's also a new clean_flicker_noise step in the pipeline (as of jwst v1.16.0 and later) that can be used to clean 1/f noise at the group stage even for BOTS data (https://jwst-pipeline.readthedocs.io/en/stable/jwst/clean_flicker_noise/main.html). Since this step works at the group stage it is a bit slower, but may be more technically correct.
Q6: How do I find papers written with JWST data?
A6: STScI maintains the below list of refereed publications from the professional literature with significant JWST content: https://www.stsci.edu/jwst/science-execution/science-publications
Q7: How do I get started writing a JWST proposal?
A7: Use the documentation, JDox, to learn more. Start here: https://jwst-docs.stsci.edu/jwst-opportunities-and-policies/jwst-call-for-proposals-for-cycle-4/jwst-proposal-workflow#gsc.tab=0