## ACS Jupyter Notebooks

ACS CTE Forward Modeler

This example provides guidelines for simulating the effects of CTE losses on synthetic images or existing CTE-corrected WFC images.

ACS Pixel Area Maps

This example demonstrates how to create pixel area maps (PAMs) to account for the effects of geometric distortion in distorted images. This enables users to perform photometry on distorted images (FLTs or FLCs) if desired.

ACS Reduction

This example demonstrates how to use the CALACS pipeline to re-process raw ACS data retrieved from MAST.

ACS SBC Dark Analysis

This example demonstrates how to account for dark current in ACS/SBC observations. The temperature of the SBC detector increases steadily over time while it is in use, and the dark current is proportional to temperature. At temperatures above 25 ºC, the dark current is no longer negligible and must be subracted.

ACS Subarrays

This example demonstrates how to calibrate, de-stripe, and correct ACS subarray observations for charge transfer efficiency (CTE). Also included are instructions for updating the OCSNTAB reference file to subtract the bias level from the prescan columns in user-defined subarray observations.

ACS Saturation Trails

The notebook demonstrates how to obtain accurate relative photometry of saturated sources using custom apertures.

## ACS Webtools

### ACS Zeropoint Calculator

This webtool is designed to provide users with an interface for computing time-dependent zeropoint information (e.g PHOTFLAM, STmag, VEGAmag, etc..). It uses the most recent component and throughput files to compute the zeropoints for all filters or one specified by the user. The results are displayed in an table and if an extraploation warning is raised by pysynphot, it is displayed beneath the table. For programmatic access to this webtool, please see the ACSZPT module in acstools.

### ACS Photometric CTE Calculator

This webtool is designed to provide users with an interface for computing CTE corrections using the photometric CTE model described on the Photometric CTE Corrections webpage.

hst1pass is a software routine, written in Fortran, that has been optimized for PSF-fiting photometry on HST images. hst1pass currently supports WFPC2, ACS/HRC, ACS/WFC, WFC3/UVIS, and WFC3/IR images. For a user's manual, see ACS ISR 2022-02.

LAST UPDATED: 12/07/2022