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| 12 | <meta name="DC.Subject" lang="en" content="pulsar" /> |
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| 13 | <meta name="DC.Description" lang="en" content="Searches the data archives at the ATNF" /> |
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| 19 | <title>ATNF Pulsar Data Archive: Users Guide</title> |
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| 20 | <body> |
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| 21 | <?php include_once("header.html"); ?> |
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| 22 | |
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| 23 | <h1>ATNF Pulsar Data Archive: Users Guide</h1> |
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| 24 | |
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| 25 | <center><i>This page is still under construction!</i></center> |
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| 26 | |
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| 27 | <h2>Introduction</h2> |
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| 28 | |
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| 29 | The ATNF Pulsar Data Archive exists to allow astronomers access to |
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| 30 | observations of pulsars made with the Parkes radio telescope in the |
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| 31 | last two decades. |
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| 32 | |
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| 33 | The data comes either from the Parkes Southern Pulsar Survey (the |
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| 34 | "70cm Survey", Manchester et al. 1996, MN 279, 1235), or from |
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| 35 | observations of known pulsars with one of the Parkes instruments (WBC, |
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| 36 | DFB, CPSR2). We hope to make available data from the Multibeam Survey |
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| 37 | at some point in the near future. |
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| 38 | |
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| 39 | <h2>Using the archive</h2> |
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| 40 | |
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| 41 | <h3>How to make queries</h3> |
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| 42 | |
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| 43 | The data is queried primarily on positional information. The user |
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| 44 | gives either a pulsar name or a RA/Dec position, plus a search |
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| 45 | radius. The pulsar name takes precedence over the RA/Dec position |
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| 46 | given, so to search by RA/Dec, make sure the pulsar name field is |
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| 47 | empty. |
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| 48 | |
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| 49 | <h3>Query options</h3> |
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| 50 | |
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| 51 | The query can be refined according to a number of parameters: |
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| 52 | <ul> |
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| 53 | <li> Time: A time range for the observations can be specified. The |
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| 54 | default values for this are given by the extent of the archive |
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| 55 | (ie. the default "from" date is the earliest observation, and the |
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| 56 | default "to" date is the latest). |
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| 57 | <li> Obs Mode: The query can be restricted to only survey data (just |
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| 58 | the 70cm survey for the moment), or only timing data |
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| 59 | (ie. observations of a particular pulsar). The default is both |
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| 60 | types. |
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| 61 | <li> Data Type: One of the different instruments (WBC, DFB, CPSR2, |
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| 62 | FB_1BIT) can be selected. The default is all of them. |
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| 63 | <li> Frequency range: Multiple frequency bands can be selected from |
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| 64 | the list. |
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| 65 | </ul> |
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| 66 | |
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| 67 | The list of options on the left hand side shows the possible |
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| 68 | parameters that can be returned with your query. Note that not all |
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| 69 | fields will have values for all observations. |
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| 70 | |
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| 71 | The list can be ordered according to a limited range of these |
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| 72 | parameters: distance (from the query position - the default), date of |
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| 73 | observation, frequency, and filename. |
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| 74 | |
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| 75 | Finally, it is possible to search for calibration observations that |
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| 76 | were taken within a given time period of the science observations. To |
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| 77 | do so, check the box under "DISPLAY OTHER DATA" and set the time limit |
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| 78 | in which to search for Cals (the default is 30 minutes). |
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| 79 | |
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| 80 | <h3>Navigating around the archive</h3> |
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| 81 | |
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| 82 | The first page returned when you submit your query is the list of the |
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| 83 | first (up to) 20 observations. Only 20 observations are displayed at a |
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| 84 | time. You can move through the list by clicking on the page numbers |
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| 85 | above or below the table. |
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| 86 | |
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| 87 | Note that a limit of 1000 results is returned for the query -- if you |
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| 88 | are getting more than this, perhaps you can afford to narrow your |
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| 89 | search! |
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| 90 | |
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| 91 | In the top right |
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| 92 | |
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| 93 | <h3>Viewing profiles of pulsars</h3> |
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| 94 | |
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| 95 | For some types of data, it is possible to view a pre-scrunched pulse |
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| 96 | profile. To do so, select the observations using the check boxes in |
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| 97 | the table, and select "View selected profiles" from the drop-down |
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| 98 | menu. This will display profile plots for all selected observations, |
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| 99 | unless they are unable to be pre-scrunched (for instance, survey |
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| 100 | observations). |
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| 101 | |
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| 102 | To return to the results table, click the table icon at top right. |
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| 103 | |
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| 104 | <h3>Downloading data</h3> |
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| 105 | |
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| 106 | |
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| 107 | |
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| 108 | <h3>Caveats</h3> |
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| 109 | |
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| 110 | |
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| 111 | <h2>Acknowledgments</h2> |
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| 112 | |
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| 113 | |
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| 114 | |
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| 117 | </html> |
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