Questions about IRAF and STSDAS

Questions about GASP

Questions on HST Data Tapes

Questions about Publications

Frequently Asked Questions about IRAF and STSDAS:

Q: Who do I contact with questions about STSDAS?

A: You can call (410) 516-5100 or send an e-mail message to hotseat@stsci.edu.

Q: Who do I contact with questions about IRAF?

A: You can send a message to iraf@noao.edu .

Q: How can I obtain IRAF?

A: IRAF has to be requested from NOAO. You can obtain it electronically by anonymous ftp from noao.edu, or request a tape by sending a message to iraf-request@noao.edu, or writing to:

        IRAF Release 
	P.O. Box 26732 
	Tucson, AZ 85726 

Q: How can I obtain STSDAS?

A: You can obtain the latest release of STSDAS (or any of the updates) from stsci.edu by anonymous ftp, by sending a message to stsdas@stsci.edu, or by mail to:

	3700 San Martin Drive
	Baltimore, MD 21218

Q: Will IRAF/STSDAS run on my machine?

A: There are releases of IRAF/STSDAS for the following systems: HP Apollo, DECstation, DG/AOSVS, SUN (386i, 3 and 4), VAX/BSD, VAX/ULTRIX, VAX/VMS Silicon Graphics and Macintosh under A/UX. There is a port but limited support for the versions running on Alliant Convex and other HP systems.

Q: What do I do if it does not run?

A: Contact NOAO or STScI at the addresses given above. In the case of STSDAS you can also call (410) 516-8400 or send e-mail to hotseat@stsci.edu.

For further information, visit the STSDAS home page.

Frequently Asked Questions about GASP:

Q: Is GASP available to anyone for any kind of projects?

A: We are presently unable to support GASP requests for non-HST related work. We have neither the personnel nor the resources to do so. If you plan to visit STScI you can do the work yourself on a non-interference basis with other ongoing GASP activities. This will usually involve working at night or on weekends. STScI cannot offer any financial support for this activity.

Q: I need some GASP information. How and where do I send the request?

The format for submitting GASP request coordinates is :

         1         2         3         4         5         6         7         8
 OBJECTNAME1      11 22 33.456  0.00000 +12 34 56.78  0.0000 1950.0
 OBJECTNAME2      22 33 44.567  0.00000 - 1 01 02.34  0.0000 1950.0
All values must be in the columns as shown above. There should be a space before the first letter of the object id, as shown. The object id should not contain invalid characters for VMS filenames (such as '+' or '$'). There should not be any tabs. The columns with 0.00000 are proper motion columns, and they should remain 0.00000. The minus signs should remain in the same columns as shown. The seconds for both RA and DEC must contain a decimal point in the proper column. Be sure to include the equinox. If known, please include the value of the magnitude in your message. Please send your requests to: gasp@stsci.edu.

Frequently Asked Questions about HST's Data Tapes:

Q: What am I going to receive?

A: You will receive FITS tapes with your data, a summary of the observations (if it exists) which complements the information in the trailer (.trl) files, hard copies of the data (plots for the spectra), a listing of the contents of the tape and a copy of the HST Data Handbook.

Q: What is on the tape?

A: The tape will have the raw, uncalibrated data, plus all the files generated by the calibration pipeline. The tapes containing FOS or GHRS spectra will also include the reference files used by the pipeline to calibrate the data.

Q: How do I know what happened during the observation?

A: This information is usually stored in the trailer file that is included on the tape. Please contact the Science Support Branch at help@stsci.edu for more details.

Q: When I am going to receive the tape?

A: The data are received by the Data Archive Operations Group (DAOG) approximately one day after it is taken. About 8 hours later the tape is written and sent to the PI (or to the person indicated in the Data Distribution Form). The tapes are sent via UPS.

Q: Can I pick up the tape at STScI?

A: Tapes, hardcopies and summaries are shipped to the users. If you need to pick them up, please contact the Archive hotseat at (410) 338-4547 or archive@stsci.edu.

Q: How do I read the tape?

A: If your FITS tape was written in group format you can use the `strfits' task in the STSDAS' fitsio package. Set the parameters "xdimtogf" and "oldirafname" to "yes". You will then recreate a group format file on disk with the same name that the pipeline gave to your dataset. This is a must for most of the instrument specific tasks in STSDAS.

The tape can also be read by any FITS reader. However, only FITS readers capable of reading tables will read in the group parameter keywords that are stored in the associated table.

Q: What are those strange file names in the listing of the tape?

A: If you requested the tape to be written in group format, the listing will look strange. In order to write the group formatted files on tape, the group information is written in a table (extension ``tab") and the data have a ``_cvt" attached to it.

Q: Do I need to ask for the data in group format?

A: If you plan to recalibrate the data using the tasks in STSDAS, it has to be in group format. It is also a very convenient way of storing many separate observations in a single file.

Frequently Asked Questions about Publications:

Q: How should I acknowledge in my papers that the data were taken with HST?

A: All research papers based on HST data must carry the following footnote:

  ``Based on observations with the NASA/ESA Hubble Space 
    Telescope, obtained at the Space Telescope Science 
    Institute, which is operated by the Association of 
    Universities for Research in Astronomy, Inc., under
    NASA contract NAS 5-26555.''

Q: How should I acknowledge the GO grant in my publications?

At the end of the text you should add the following:

  ``Support for this work was provided by NASA through grant 
    number ______ from the Space Telescope Science Institute, 
    which is operated by the Association of Universities for 
    Research in Astronomy, Inc., under NASA contract NAS 5-26555.''

Q: Is there a repository of HST-related publications?

The library of the Space Telescope Science Institute would like to receive a preprint of any research paper based on HST data. The address is:

     Space Telescope Science Institute
     3700 San Martin Drive
     Baltimore, MD 21218

Q: How should I acknowledge the use of GASP?

A: We request the acknowledgment of the use of GASP in your resulting publications (as well as sending us a preprint/reprint of them using the following phrase:

  ``[Astrometry/Finder Chart(s)/Photometry] obtained using 
    the Guide Stars Selection System Astrometric Support
    Program developed at the Space Telescope Science 
    Institute (STScI is operated by the Association of 
    Universities for Research in Astronomy, Inc., for NASA).''

The WFPC2 Instrument Handbook contains detailed information on the WFPC2 instrument and it's calibration.

STScI Home Page . WFPC2 Home Page. WFPC2 Group.

Copyright Notice (May 14, 1997) help@stsci.edu