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The WEAVE Automated Submission Platform (WASP) automatically emails the principal investigators (PIs) with submission deadlines, validation acknowledgements and any other important information concerning the preparation of phase 2. The first two emails contain the following (the subject line is provided):
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emails contains the credentials to log onto WASP. Subject line is:
Subject: [WEAVE] Account created for WEAVE observation preparation
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A following email contains information about the opening of the OB submission window:
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General assistance can be provided at the following emailemailing:
weave_open_time_support@ing.iac.es |
Phase 2:
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the short guide
The purpose of the phase 2 is the upload of a FITS catalog containing fiber positions on sky, and observing blocks (OB) written in XML describing the necessary observations to the submission platform WASP, maintained by CASU in Cambrige (IoA). At the beginning of every trimester, the uploaded, validated and selected OBs are ingested into the observing queue at the WHT.
The kick off of phase 2 is a simple catalog of targets in CSV format prepared by the PI following the instructions provided on this page. ING can provide assistance with the preparation of the aforementioned catalog, and afterwards ING can also process it to make the FITS catalog and the XML OBs, and eventually upload to and validate on WASP on behalf of the PI.
An XML OB contains the instructions to execute the observations: instrument setup, telescope pointing, guiding star, dithering, exposure times, observing constraints and calibrations (one lamp flat and two arcs, before and after the science exposures). The following is an example of the XML code of an OB with comments for users: WC_2023A1-lifu_01-tgcs.xml.
Every observed OB is reduced and calibrated using automatic pipelines at CASU (IoA, Cambridge). Data is flux calibrated using a standard sens functions. However, applicant scan submit their own OBs for observing flux standards along with the science OBs. Every trimester we accept a maximum of 100 OBs per programme.
Below we provide an example of real observations made from a simple OB which consists of 3 exposures 1020s each following a 3-point dithering pattern in LIFU low-resolution mode and arbitrary position angle:
PROGTEMP, OBSTEMP: use the OBSTEMP and the PROGTEMP builders to generate them.
IFU_DITHER: it is set to 0 if not specified (no dithering). Standard dithering patterns for 3, 4, 5 and 6 points are available for selection (read more information on IFU_DITHER below).
The position angle (PA, as measured from North to East) is automatically set to 180º, for declinations North to 28.7º, and to 0º, for declinations South to 28.7º. Note that these PAs could be slightly different to allow for finding a suitable acquisition and guiding star. For any other PAs, read more information on requested PA below. Not all values are posible given the rotator limits, and similarly to the above, it can change for finding a suitable acquisition and guiding star.
CSV catalog:
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TARGID,TARGNAME,GAIA_RA,GAIA_DEC,PROGTEMP,OBSTEMP,IFU_DITHER
NGC3158,NGC3158,153.460497,38.764898,41331,NBCEB,3
Validated FITS catalog on WASP: WS2022A2-002.fits
Validated XML OB on WASP and ready for ingestion into the observing queue: 1713807920_1.xml
Log entry as a result fo the execution of the above OB. Note that the target coordinates correspond to the center of the field of view, not the centre of the LIFU array.
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ING takes biases every night and twilight sky flats regularly. If you need these sets of calibrations when working with your data, please contact ING.
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WEAVE Open-Time Phase 2: the short guide
LIFU mode: catalogue preparation
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