WebChaSeR is targeted at the average user: it is easy to use, does not require any setup, but it does not have the full flexibility of ChaSeR.
ChaSeR is a Java-based application that needs to be installed on your host. It has more sophisticated capabilities, both in searching and retrieving. The installation is a simple download-and-install process that is no more complicated than the average application installation on a PC or Mac, particularly if you take the bundled Java installation.
Both are accessible from the CDA home page: http://cxc.harvard.edu/cda
ObsId: single, list, range, list of ranges
Sequence Number: as for ObsId
Target name: the given string will be matched as a substring in target names; blanks are not significant; optional use of name resolver
Coordinates: cone search in equatorial, ecliptic, or galactic coordinates
Type: CAL, GO, GTO, TOO, or DDT observations
Status: unobserved, scheduled, partially observed, observed, archived, canceled, discarded
PI name: substring
The user has some control over the format of the search results: sort order and coordinate system and format. Individual observations may be selected from the search list for data product retrieval and the user has the choice between the primary and/or secondary packages of data products. The user may also log in to a PI or proposal account, in which case WebChaSeR allows retrieval of proprietary data for which the account is authorized. The selected products may be browsed before retrieval. Retrieval of the data products is effected by WebChaSeR's transferring the products to a tar file that is deposited on an ftp staging disk and the user being informed of the exact path/URL; note that this is important: the cryptic path serves as your security to protect proprietary data.
The user can change the order of the search results table interactively (click-and-drag).
ChaSeR provides access to preview images and detailed observation information.
The user has the ability of customizing the retrieval package down to specific filetypes by ObsId, by filling a ``shopping cart".
Retrieval may be via the ftp staging area or through a direct connection.
ChaSeR has been succesfully installed and used on Solaris, Linux, Dec Alpha, Windows, and Mac (OS X) platforms.
Conversely, the ADS links to the CDA: when ADS users browse through the articles, those that are associated with specific Chandra observations will have a link that goes directly to the WebChaSeR retrieval page for those observations.
Needless to say, the maintenance of this database is very labor intensive. It would help us greatly if you could inform us of any papers that are about to be published (or that have been published but are missing from the database), with all ObsIds that were used in these papers. Please send E-mail to email@example.com. Thank you.
The other members of the Archive Operations team: Stephane Paltani, Ed DeLuca, Sherry Winkelman, Padmanabhan Ramadurai, Michael Preciado, and Emily Blecksmith
The database development team: Panagoula Zografou, Peter Harbo, John Moran, Alesha Estes, David Van Stone, and Alex Patz
Processing Status Tool interface: Diane Hall
- Arnold Rots