Data Status
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This website is kept for archival purposes only and is no longer updated. |
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OBSERVATION FAQsGALEX's orbital and observational constraints limit observations of most targets to a couple of "seasons" a year. You can use the Visibility Tool to determine when these periods are, and to give you an idea when observations are possible. The actual schedule is determined and uploaded a week or two ahead of the planned observations. Status of completed observations can be found HERE.
HOW CAN I FIND OUT THE STATUS OF A GI OBSERVATION?The observational status files are the latest information we
have. Starting at the Site Home page, click on “Observation
Status Files” (near bottom), which will take you to: You can choose your format under "GI Observations - Recent Observations and Cumulative Exposures." The .csv file usually downloads as Excel, but that will depend on your host computer applications. The .txt file is best for a quick look, so click on that. It contains two separate tables. The top table tells you what was observed in the latest interval (should be weekly), ordered by satellite eclipse number. The bottom table tells you the status of each target. Lately they have been sorted by target name (far right column). The target name is constructed as GI(cycle#)_(program#)(target#)_(yourtargetname) HOW CAN I TELL WHAT OBSERVATIONS ARE CURRENTLY IN THE LONG-TERM GALEX PLAN, AND THE STATUS OF EACH PLANNED OBSERVATION?You can see what is in the mission plan and determine its status by using either of two methods:
If you know your target’s name (GI
target, say), you can just search for it by name. Target names are
constructed as For GI targets, the names are constructed as: (GI)(cycle#)_(program#)(target#)_(yourtargetname) , i.e. they are part of the “GI Survey” Table column explanations are given here. (link to All Obs status explanation)
Object_id 3430, which was in the MIS as field MISDR1_24209_0503, was pointed at the target for 1167 sec in both FUV and NUV, but it is now considered too bright to be safely observed (the -999 indicates that it tripped an automatic detector shutdown and it will not be scheduled for any further observations.). where you enter the coordinates of
the object in question. Default is a cone search with angular diameter the size
of the GALEX Field-of-View (1.2 degrees). Using the advanced option allows you
to search for only certain surveys, or in a
user-selected area of the sky (rectangular area or larger cone
search). HOW CAN I TELL WHEN A TARGET WILL BE OBSERVED?GALEX's orbital and observational constraints limit observations of most targets to a couple of "seasons" a year. You can use the Visibility Tool to determine when these periods are, and to give you an idea when observations are possible. The actual schedule is determined and uploaded a week or two ahead of the planned observations. You can see when your targets could be observed (i.e. when it is possible for GALEX to point at them), by using the visibility tool. Click on "tools" on the sidebar, then on “Visibility Tool.” This will take you to: http://sherpa.caltech.edu/gips/tools/gmosvis.html Enter the target coordinates, click “submit” and
in a short time a visibility plot will appear. The default is to plot
visibilities for the upcoming proposal cycle, but other times may be examined
(e.g. current observing cycle) using the Advanced button. HOW DO I KNOW WHEN MY GI TARGET WAS OBSERVED?We (galexhelp) will notify you when
your GI target has been observed, as soon as we receive an updated status file
letting us know that the observation was successfully obtained, downloaded, and
processed through the pipeline. HOW LONG A DELAY SHOULD BE EXPECTED BETWEEN OBSERVATION OF A TARGET AND ITS AVAILABILITY IN MAST?Imaging data should be processed through the pipeline and available through MAST within 30 days of observation (grism data takes longer). Part of this delay is because GI data is shipped from Caltech to MAST and staged by MAST once a month. We (galexhelp) will notify you by email you when your data is available at MAST and your 6 month proprietary period begins. It is our intent to notify you again shortly before the proprietary period ends. You can check the status of planned GI observations using the
Observational Status Files (link to Obs. Status files).
WHAT IS THE PROPRIETARY PERIOD FOR GALEX OBSERVATIONS?PI team data has no proprietary period. However, the data is delivered to MAST in major data releases (GALEX Releases, or GRs) similar to those used by the SDSS. The current plan is for yearly GRs, but this is strongly dependent on mission funding. GI data has a proprietary period of 6 months from the date that the data is made available to the GI. The (short) proprietary period was mandated by HQ at the time the GALEX GI program was approved and funded. If a GI observation contains more than one orbit of exposure
time, the data delivery will include both individual observations (orbits,
eclipses) and co-adds. Each new observation will result in a new, deeper,
coadded image. Both individual
observations and co-adds will become public after the 6 month proprietary time
from the original delivery to MAST. DO GI TARGETS CARRY-OVER FROM ONE CYCLE TO THE NEXT?If your target is a Snap or ToO target, it will not be carried over – it will not be observed beyond the end of the Cycle for which it was accepted If your target was accepted in a previous cycle Standard or Legacy proposal, but was not observed (or did not get all the FUV time requested), it will be carried over into the next cycle, and will remain in the GALEX mission plan until observations are complete. GI data is delivered once a month to MAST. Note that there may be nearly a year’s delay before the target can be observed again, depending on its Visibility. HOW TO GET MY PROPRIETARY GI DATA FROM MASTThis information is emailed to each GI, by the helpdesk, when the GI data is available at MAST.
http://www.galex.caltech.edu/researcher/techdocs.html (click here)
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