*CIAO 4.5 and CALDB 4.5.5 released 13 December 2012*
==================================================
The Chandra X-ray Center (CXC) is pleased to announce that version 4.5
of CIAO ("Chandra Interactive Analysis of Observations") and version
4.5.5 of CALDB ("Calibration Database") are available for download from:
http://cxc.harvard.edu/ciao/download/
Notable changes and improvements in CIAO 4.5:
* The new*tg_findzo* tool helps users locate the zeroth order location for heavily
piled sources and in the observations that have intentionally masked out the zero order events.
* Various updates related to creating merged datasets, especially larger mosaics that exceed
the standard image sizes. This includes updates to*reproject_events* and*dmmerge* to
adjust the limits based on the data and to*dmextract* to keep a consistent definition of
BACKSCAL regardless of image size.
**Sherpa* updates includes a comprehensive review of how grouping and
filtering interact when both source and background datasets are in use.
Also, a new sample_flux routine is available to allow users to compute
the flux due to a sub-component of a Sherpa model; and the*modelflux*
tool has been upgraded to calculate unabsorbed as well as absorbed flux.
* In*ChIPS* it is now possible annotate plots directly either via the GUI or by right-clicking on
plots; text, points, lines, ellipses, boxes, polygon, and even color bars can be added.
* Numerous bug fixes and enhancements were made to many parts of the system including
speed enhancements to wavdetect, fixes to ChIPS clobbering existing files,
and Obsvis upgrades for number of allowed CCDs.
**NOTE*: as previously announced,*the mkpsf tool has been withdrawn* from CIAO; users
should use ChaRT and MARX to simulate 2D models of the point spread function.
Read the complete CIAO 4.5 release notes, including the section "How
CIAO 4.5 and CALDB 4.5.5 Affect Your Analysis" at:
http://cxc.harvard.edu/ciao/releasenotes/ciao_4.5_release.html
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CIAO 4.5 is distributed for the following platforms:
* Linux 32-bit and 64-bit
* Mac OS X Intel 10.6 (Snow Leopard), 10.7 (Lion) and 10.8 (Mountain Lion) 64-bit
More details athttp://cxc.harvard.edu/ciao/download/platforms.html
-----------------------------------
In tandem with CIAO 4.5 is the release of the Chandra Calibration
Database version 4.5.5
CalDB 4.5.5 includes the following new items:
1. ACIS T_GAIN Epoch 51
2. ACIS time-dependent QEU files version N0007
3. HRC-I GMAP and PIBGSPEC for Sept 2012
4. HRC-S QE versions N0012
5. PIMMS Effective Area CY15 files
6, Header correction for ACIS Group E BKGRND files
7. Header changes to specific ACIS CTI and DET_GAIN files for optimized file selection.
Detailed information can be found in the Chandra
Calibration Database website athttp://cxc.harvard.edu/caldb/
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As always please send questions and requests for enhancements to the CXC
HELPDESK (http://cxc.harvard.edu/helpdesk/).
CIAO 4.5 is a collaborative effort between the SAO/CXC Science Data
Systems, the SAO/CXC Data Systems, and MIT/CXC personnel.
Antonella Fruscione (for the CIAO development team)
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