<p>You can get these data from MAST but it's not terribly obvious. Once you have filtered down to the data you want, selecting the data for download will produce a box that allows Uncalibrated file types to be returned. Searching the MAST archive for Hubble Space Telescope(HST) data from the Advanced Camera for Surveys (ACS; which contains the Wide Field Camera (WFC) and High Resolution Camera (HRC) you seek) in the specified filter (F814W; a <code>W</code>ide <code>F</code>ilter, centered at <code>814</code> nm) for galaxy data (<a href="https://mast.stsci.edu/search/hst/ui/#/results?radius=3&amp;radius_units=arcminutes&amp;data_type=image&amp;observations=S&amp;active_instruments=acs&amp;spectral_element=F814W&amp;custom_col_sel_0=sci_status&amp;custom_col_val_0=PUBLIC&amp;custom_col_sel_1=sci_target_descrip&amp;custom_col_val_1=%2AGALAXY%2A&amp;select_cols=ang_sep,sci_aper_1234,sci_central_wavelength,sci_data_set_name,sci_dec,sci_actual_duration,sci_spec_1234,sci_hlsp,sci_instrume,sci_preview_name,sci_pep_id,sci_ra,sci_refnum,sci_release_date,scp_scan_type,sci_start_time,sci_stop_time,sci_targname,sci_status,sci_target_descrip&amp;useStore=false&amp;search_key=6fd2e6cadbcbb" rel="nofollow noreferrer">MAST query URL</a>) should produce a display that looks like:
<a href="https://i.sstatic.net/YCI24.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/YCI24.png" alt="Result of query on the MAST archive" /></a></p>
<p>Selecting data that you want to download (tick boxes on the left side; note this search was for public data so data that is still within its proprietary period after being taken and therefore only available to members of the proposal should not appear in the results) will produce a 'Download Data' button:
<a href="https://i.sstatic.net/lncWH.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/lncWH.png" alt="MAST archive showing selected datasets and download data button" /></a></p>
<p>Clicking the 'Download Data' button will (might take a while if you have lots of datasets selected) bring up a dialog box which allows you to select 'Uncalibrated' and/or 'Reference' to see those file types along with the pipeline processed calibrated images (note the <code>_raw</code> and <code>_spt</code> FITS files options that have now appeared):</p>
<p><a href="https://i.sstatic.net/7pw7Q.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/7pw7Q.png" alt="MAST archive screenshot showing Uncalibrated data" /></a></p>
<p>Selecting these will result in those datafiles being added to your downloadable dataset. HST documentation and the Instrument and Data Handbooks for all the current and past instruments can be found <a href="https://hst-docs.stsci.edu/hom" rel="nofollow noreferrer">here</a>. In particular the <a href="https://hst-docs.stsci.edu/acsdhb" rel="nofollow noreferrer">ACS Data Handbook</a> has a <a href="https://hst-docs.stsci.edu/acsdhb/chapter-2-acs-data-structure/2-1-types-of-acs-files" rel="nofollow noreferrer">Section 2.1 (Types of ACS files)</a> which explains what the many suffixes mean. There are a lot of processing steps that occur to the raw data before pipeline products are delivered to the archive which are outlined in the later chapters of the ACS Data Handbook - it is strongly recommended to read these to understand the processing that was done and the calibration files needed if you are trying to replicate it, particularly for HST data (which has a lot of cosmic rays) and ACS data (which has significant geometric distortion). There is a section on <a href="https://hst-docs.stsci.edu/acsdhb/chapter-3-acs-calibration-pipeline/3-5-manual-recalibration-of-acs-data" rel="nofollow noreferrer">manual recalibration of ACS data</a> which makes use of Python.</p>

CC BY-SA 4.0
2021-11-19T17:18:58.530Z
2023-05-08T22:54:59.513Z
2023-05-08T22:54:59.513Z
astrosnapper
<p>I'm doing a project that requires raw .fits images that contain a certain galaxy from the HST (F814W filter).</p>
<p>I've been able to find the calibrated images of the WFC view using the MAST data portal. However, there is no raw data listed. I would also like to find any of the corresponding HRC data as well if possible.</p>
<p>If anyone out there knows where to find the data, please let me know!</p>

CC BY-SA 4.0
2021-11-19T12:01:07.107Z
For my curiosity: what kind of projects require uncalibrated data with all the instrument artefacts?
planetmaker
CC BY-SA 4.0
2021-11-19T23:42:05.687Z
Using it to generate a noise map for strong lensing ray tracing simulations. Will probably be unnecessary in the long run, but it may be useful to compare it to previous results that have been computed from a raw data pipeline.
hollowhills
<hubble-telescope><raw-data>
Finding raw HST data for WFC or HRC?
hollowhills
# Finding raw HST data for WFC or HRC?

(Asked by: username_0 on 2021-11-19)

I'm doing a project that requires raw .fits images that contain a certain galaxy from the HST (F814W filter).

I've been able to find the calibrated images of the WFC view using the MAST data portal. However, there is no raw data listed. I would also like to find any of the corresponding HRC data as well if possible.

If anyone out there knows where to find the data, please let me know!

**Tags:** hubble-telescope, raw-data

> **Comments:**
> **username_1**: For my curiosity: what kind of projects require uncalibrated data with all the instrument artefacts?  
> **username_0**: Using it to generate a noise map for strong lensing ray tracing simulations. Will probably be unnecessary in the long run, but it may be useful to compare it to previous results that have been computed from a raw data pipeline.  

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## 1 answers

### Answer by username_2 on 2021-11-19. Score: 5

You can get these data from MAST but it's not terribly obvious. Once you have filtered down to the data you want, selecting the data for download will produce a box that allows Uncalibrated file types to be returned. Searching the MAST archive for Hubble Space Telescope(HST) data from the Advanced Camera for Surveys (ACS; which contains the Wide Field Camera (WFC) and High Resolution Camera (HRC) you seek) in the specified filter (F814W; a `W`ide `F`ilter, centered at `814` nm) for galaxy data ([MAST query URL](https://mast.stsci.edu/search/hst/ui/#/results?radius=3&radius_units=arcminutes&data_type=image&observations=S&active_instruments=acs&spectral_element=F814W&custom_col_sel_0=sci_status&custom_col_val_0=PUBLIC&custom_col_sel_1=sci_target_descrip&custom_col_val_1=%2AGALAXY%2A&select_cols=ang_sep,sci_aper_1234,sci_central_wavelength,sci_data_set_name,sci_dec,sci_actual_duration,sci_spec_1234,sci_hlsp,sci_instrume,sci_preview_name,sci_pep_id,sci_ra,sci_refnum,sci_release_date,scp_scan_type,sci_start_time,sci_stop_time,sci_targname,sci_status,sci_target_descrip&useStore=false&search_key=6fd2e6cadbcbb)) should produce a display that looks like:
[![Result of query on the MAST archive](https://i.sstatic.net/YCI24.png)](https://i.sstatic.net/YCI24.png)

Selecting data that you want to download (tick boxes on the left side; note this search was for public data so data that is still within its proprietary period after being taken and therefore only available to members of the proposal should not appear in the results) will produce a 'Download Data' button:
[![MAST archive showing selected datasets and download data button](https://i.sstatic.net/lncWH.png)](https://i.sstatic.net/lncWH.png)

Clicking the 'Download Data' button will (might take a while if you have lots of datasets selected) bring up a dialog box which allows you to select 'Uncalibrated' and/or 'Reference' to see those file types along with the pipeline processed calibrated images (note the `_raw` and `_spt` FITS files options that have now appeared):

[![MAST archive screenshot showing Uncalibrated data](https://i.sstatic.net/7pw7Q.png)](https://i.sstatic.net/7pw7Q.png)

Selecting these will result in those datafiles being added to your downloadable dataset. HST documentation and the Instrument and Data Handbooks for all the current and past instruments can be found [here](https://hst-docs.stsci.edu/hom). In particular the [ACS Data Handbook](https://hst-docs.stsci.edu/acsdhb) has a [Section 2.1 (Types of ACS files)](https://hst-docs.stsci.edu/acsdhb/chapter-2-acs-data-structure/2-1-types-of-acs-files) which explains what the many suffixes mean. There are a lot of processing steps that occur to the raw data before pipeline products are delivered to the archive which are outlined in the later chapters of the ACS Data Handbook - it is strongly recommended to read these to understand the processing that was done and the calibration files needed if you are trying to replicate it, particularly for HST data (which has a lot of cosmic rays) and ACS data (which has significant geometric distortion). There is a section on [manual recalibration of ACS data](https://hst-docs.stsci.edu/acsdhb/chapter-3-acs-calibration-pipeline/3-5-manual-recalibration-of-acs-data) which makes use of Python.


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