UVIS Grism Sky Images

These are the sky images for the WFC3/UVIS G280 grism for both the calibrated, flat-fielded individual FLT exposures, as well as their corresponding CTE-corrected FLC frames. The observations used for generating the G280 sky are public on-orbit science exposures retrieved from MAST as of July 2023. The sky frames are created by stacking exposures with sources aggressively masked. The full procedure is described in ISR 2023-06.

The calibration frames linked here are included directly in slitlessutils and can used during pre-processing with the Background() class. For a step-by-step tutorial on downloading, pre-processing (including background subtraction), and extracting spectra from UVIS grism frames with slitlessutils, please see the G280 extraction notebook.

The files included on this page can also be used with the deprecated HSTaXe software; however, users should consider moving to slitlessutils.

FITS versions of the images are linked below. 

Change history:

v1.0 - 12/30/24 - Images were generated largely following the process described in ISR 2023-06. The only difference in the process consisted in weighting the co-adds by exposure time instead of a straight average. 

v0.5 - 11/21/23 - First release