Dear Chandra Users and ISIS Users,
We are pleased to announce some changes in TGCat, the Chandra Gratings
Data Catalog and Archive, and in the ISIS reprocessing software.
- Web Interface:
We have changed the web interface to TGCat, the Chandra Grating Data
Catalog and Archive (<http://tgcat.mit.edu/>).
The new interface
* is menu based;
* supports multiple unified "plug in" back-end interfaces, such as
Virtual Observatory (VO) tables;
* has much smaller web data volume transfer;
* remembers user queries; and
* has an enhanced download package management interface.
For a while, the old interface will be available at
For further details, see the Announcement linked on the main page:
For users of the TGCat ISIS reprocessing scripts: there are two
enhancements in the latest software version:
* automatic application of the HRC-S time-dependent gain in PI
computation, IF CIAO 4.2 and the CALDB 4.2.0 are installed.
This reduces LETGS backgrounds by about a factor of 2. (See the
"HRC-S Imaging and Grating Data" section of the CIAO 4.2 Release
* automatic (or manual) production of Type I PHA files (single
spectrum), which can be more convenient for Xspec users. The Type
II files (multi-order) will still be available.
For software information, see the "Help" menu on the main page.
- Reprocessing plans
In order to provide updated analysis-ready products which include
the HRC-S time-dependent gain-correction, and the latest updates to
ACIS contamination, we intend to reprocess all LETGS observations
and all ACIS observations since 2005 sometime in the next 2 months.
We will also add the split Type I PHA files to the data products.
We will announce completion on the web page and to this
David Huenemoerder, for the Grating Analysis Team.
(Send comments or feedback to firstname.lastname@example.org)
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