Chaser Field Help

AO
Announcement of opportunity number (proposal round) of which the observation was a part

Approved Exposure Time
Approved exposure time for the observation in ks

Coordinate Display Format
The user may specify whether the output positions in the search results appear in sexagesimal (HMS/DMS) units or in decimal degrees. For equatorial coordinates, if sexagesimal is chosen, the RA will be displayed in hours/minutes/seconds. For ecliptic or galactic coordinates, if sexagesimal format is chosen, the longitude (Long/l) will be displayed in degrees/minutes/seconds.

Coordinate System
Coordinate System of the position. Choices are Equatorial (FK4 and FK5), Ecliptic, and Galactic.

Creation Date
The date on which the file was created

Data Mode
Datamode contains information for ACIS observations on two components of the instrument set-up:

read mode
event format

It follows the same encoding as the keyword DATAMODE in the FITS files:

Read Mode	Event Format	Data Mode
TE	F	FAINT
TE	F+B	FAINT_BIAS
TE	VF	VFAINT
TE	G	GRADED
CC	F or F3	CC33_FAINT
CC	F1	CC_FAINT
CC	G or G3	CC33_GRADED
CC	G1	CC_GRADED

Currently for HRC observations Data Mode is null.

Dec/Lat/b
Declination/Latitude of the position

Data Entry Information: See the section Valid Coordinate Format for information on valid input coordinate formats. A cone search will be performed using the RA, Dec and Radius specified.

Display
Customizations on the display of the search results

Display Format
The two choices for the output display format are:

HTML: Proceeds to Search Results HTML page
Text: Returns text page of results (in rdb format), which can be printed or saved in a file

Equinox
Equinox corresponding to the coordinate system

Data Entry Information: If this field is empty, the default values of 2000 (for Equatorial J2000) or 1950 (for Equatorial B1950 or Bxxxx and for Ecliptic B1950 or Bxxxx) will be used.

Exposure Time
Actual exposure time(s) for the observation in ks

Data Entry Information: This field may consist of a comma delimited list of exposure time ranges. See the section on Valid Range Format for more information.

File Name
Name of a file in the archive for the observations and products selected. The file is usually stored in a gzip-compressed format but the filename does not reflect this.

File Size
Size in bytes of the file. This is the original length, not the length of the compressed version of the file.

Grating
The three choices for the gratings are:

NONE
LETG: Low Energy Transmission Grating (commonly used with HRC)
HETG: High Energy Transmission Grating (commonly used with ACIS)

Data Entry Information: See Multiple Selection Lists for more information on using lists

Grid
Grid name assigned if this observation is part of a user-defined grid

Data Entry Information:

Blank - ignore the grid field
No - all observations that are NOT part of a grid
Yes - all observations that ARE part of a grid

Instrument
The two Chandra instruments are:

ACIS (AXAF CCD Imaging Spectrometer)
HRC (High Resolution Camera)

Each has a spectral (-S) and an imaging (-I) component.

Data Entry Information: See Multiple Selection Lists for more information on using lists

Joint Observatories
Other observatories that were part of this observation (if any)

Data Entry Information: See Multiple Selection Lists for more information on using lists

Name Resolver
Name of the service or services that will be used to resolve the target name when the Resolve Name button is pressed. The services will be chosen in the specified order. For example, "NED/SIMBAD" will first search for the target name in NED and then, if the name was not found, in SIMBAD.

Observation ID
Observation identification number

Data Entry Information: This field may consist of a comma delimited list of obsid ranges. See the section on Valid Range Format for more information.

Observer Name
Last name of the Observer. The Observer is a Co-Investigator designated by the Principal Investigator to be responsible for the observation. Not all observations have such a designated Observer.

Data Entry Information: The matching is case insensitive. Any Observer Name that contains the entered value will be returned.
For example, entering smith could match:

SMITH
SMITHERS
BLACKSMITH

Observing Cycle
Announcement of opportunity number (proposal round) of which the observation was a part

Data Entry Information: See Multiple Selection Lists for more information on using lists

Password
Personal archive accounts and proposal accounts both have passwords that can be changed from a link on the archive login page. If the password has been forgotten, a request for a password reminder email to be sent to the account holder can be made from a link on the archive login page.

PI Name
Last name of the Principal Investigator

Data Entry Information: The matching is case insensitive. Any PI Name that contains the entered value will be returned.
For example, entering smith could match:

SMITH
SMITHERS
BLACKSMITH

Primary Products
The package of primary data products. This package contains all products necessary for analysis if the CXC's Automated Processing is deemed satisfactory. If any corrections are to be made, the Secondary Products are required as well.

Product
Data product may be primary or secondary

Proposal Number
8-digit number identifying the proposal for an observation

Data Entry Information: This field may consist of a comma delimited list of proposal number ranges. See the section on Valid Range Format for more information.

Proposal Title
The title of the proposal

Data Entry Information: The matching is case insensitive. Any Proposal Title that contains the entered value will be returned.
For example, entering observ could match:

ASTEROID OBSERVATION
OBSERVATION OF M-DWARF SYSTEM
CHANDRA OBSERVATIONS OF M31

Public Release Date
Public release date(s) of the observation

Data Entry Information: See the section Valid Date Format for legal date formats.

RA/Long/l
Right Ascension/Longitude of the position

Data Entry Information: See the section Valid Coordinate Format for information on valid input coordinate formats. A cone search will be performed using the RA, Dec and Radius specified.

Radius
Radius for the cone search in arcmin

Row Limit
Choose the maximum number of rows to display. The recommended maximum number is 50. This is because early versions of some browsers take a long time to generate the results when much more than 50 results are returned. If "No Limit" is selected and the search criteria do not limit the results sufficiently, the user may experience an unacceptable delay.

Science Category
Science category of the target object of the observation

Data Entry Information: See Multiple Selection Lists for more information on using lists

Secondary Products
The package of secondary data products. If the user needs to make any corrections to the CXC's Automated Processing, this package is required in addition to the Primary products.

Sequence Number
Six-digit sequence number

Data Entry Information: This field may consist of a comma delimited list of sequence number ranges. See the section on Valid Range Format for more information.

Sort Order
The order in which the search results are displayed. The user may choose to sort by any element in the selection list. The user also specifies whether the results should be sorted in ascending or descending order.

Start Date
Start date(s) and time(s) of the first (or only) observation interval of the observation

Data Entry Information: See the section Valid Date Format for legal date formats.

Status
The observation status can be any of the following values:

Archived: Data are publicly released
Observed: Proprietary observation. Data have been released to the PI
Scheduled: Two possibilities- 1) in next week's schedule or later in this week's schedule 2) in last week's schedule or earlier in this week's schedule but Automated Processing and Verification & Validation not complete
Unobserved: Approved but not yet Observed nor Scheduled
Canceled: Observation was canceled and never took place
Discarded: Observation yielded no useful scientific data

Data Entry Information: See Multiple Selection Lists for more information on using lists

Target Name
Name of the observed object

Data Entry Information:

When this field is used in conjunction with the "Search" button, Target Name refers to the name of observed object as specified by the proposal
When this field is used in conjunction with the "Resolve Name" button, Target Name refers to the name of the object searched for in the name resolver

The matching is case insensitive and spaces are ignored. Any Target Name that contains the entered value will be returned.
For example, entering crab will match:

CRAB NEBULA
CRAB PULSAR
XTE J1550-564 (0.05 CRAB)

Type
The observation type can be any of 5 values:

TOO: Target Of Opportunity
CAL: Calibration
GO: Guest Observer
GTO: Guaranteed Time Observation
DDT: Director's Discretionary Time

Data Entry Information: See Multiple Selection Lists for more information on using lists

Username
If you have a personal archive account you may login using its username. Alternatively accounts are set up for the duration of an observation's proprietary period where the username is the observation's proposal number.

Valid Coordinate Format
Target coordinates may be specified in decimal degrees or in sexagesimal format (hours/minutes/seconds or degrees/minutes/seconds) using either colons or spaces as separators. If the user enters decimal values for RA and Dec, they are assumed to be in decimal degrees. To specify decimal hours, add "h" or "H" after the number.

Examples:

RA	Dec	System	Translation
20h 51m 06s	+30d 41' 00"	J2000	20 51 06.00 +30 41 00.00
20 51 06	+30 41	J2000	20 51 06.00 +30 41 00.00
20:51:06.0	+30:41:00.0	J2000	20 51 06.00 +30 41 00.00
23.7654	+0.6857	J2000	01 35 03.70 +00 41 08.52
23.7654h	+0.6857	J2000	23 45 55.44 +00 41 08.52
18 12.5	-12 8.5	J2000	18 12 30.00 -12 08 30.00
355 51 06	+30 41	Galactic	355 51 06.00 +30 41 00.00

For equatorial coordinates, if the RA is in sexagesimal format it is assumed to be in hours/minutes/seconds. For ecliptic or galactic coordinates, if the RA is in sexagesimal format it is assumed to be in degrees/minutes/seconds.

Valid Date Format

date = YYYY-MM-DD [hh:mm]

dateRange = date[/date] or /date or date/

valid date format = dateRange[,dateRange][,dateRange][...]

A valid date consists of a 4 digit year, followed by 2 digit month, followed by a 2 digit day, separated by dashes, followed by an optional time
A valid time consists of a 2 digit hour (00-23), followed by a 2 digit minute(00-59)
The separator "/" is used when specifying a date range
A date range beginning with a "/" means all dates up to and including the date specified
A date range ending with a "/" means all dates after and including the date specified
A date field may consist of a comma delimited list of date ranges.

Examples:

Example Date(s)	Description
2002-01-27	select all observations with a date occurring during the 24 hours of January 27, 2002
2002-01-26, 2002-01-29	select all observations with a date occurring on either January 26, 2002 or January 29, 2002
2001-11-28/2001-11-30	select all observations with a date occurring between November 28, 2001 and November 30, 2001 (inclusive)
2001-06-15 04:00/2001-06-18 23:25	select all observations with a date occurring between June 15, 2001 4:00AM and June 18, 2001 11:25PM
2001-05-20,2001-05-25 14:00/2001-05-28 17:00	select all observations with a date occurring on May 20, 2001 or between May 25, 2001 2:00PM and May 28, 2001 5:00PM (note that the comma delimited list may contain ranges)
/2000-07-01	select all observations with a date occurring on or before July 1, 2000
/2000-07-01 19:00	select all observations with a date occurring at or before 7:00PM July 1, 2000
2000-07-01/	select all observations with a date occurring on or after July 1, 2000
2000-07-01 19:00/	select all observations with a date occurring at or after 7:00PM July 1, 2000

Valid Range Format

range = value[-value] or value- or -value

valid range format = range[,range][,range][...]

A range is either a single value, two values separated by a hyphen, or an open-ended range starting or ending with a hyphen. All spaces are ignored.
A valid range format entry is a comma delimited list of ranges

Examples:

Example Range(s)	Description
1000	the range is simply the single value 1000
1000, 2000	the range is the value 1000 and also the value 2000
3000-5000	the range is all values between 3000 and 5000 (inclusive)
1000, 2000, 3000-5000, 7000-8000, 9000	the range is 1000, 2000, 3000 to 5000 (inclusive), 7000 to 8000 (inclusive), and 9000
350-	the range is all values greater than or equal to 350
-1000, 2000-3000	the range is all values less than or equal to 1000, along with all values between 2000 and 3000 (inclusive)