GMOS B600 grating transmission curve

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This topic contains 2 replies, has 2 voices, and was last updated by  Catherine Huitson 2 months, 2 weeks ago.

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  • #1506

    Dragomir
    Participant

    Two questions:

    1) The data for the B600 transmission curve (http://www.gemini.edu/sciops/instruments/gmos/gratings/gmos_n_B600_G5303.txt) appears to date from 2001. But the grating was replaced in 2009, so I was wondering whether an updated transmission curve is available for the new grating.

    2) Is there a transmission curve that is more finely sampled? The current one has only 32 bins over the 271-1087 nm wavelength range.
    And there is also this statement: “Extrapolations at short and long wavelengths to cover 300-1100nm”, which is concerning because now I am not sure how much of the transmission curve was actually measured and how much was extrapolated.

    Thanks!
    Diana

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    #1508

    Catherine Huitson
    Participant

    That’s an excellent question! As you know I have a survey program using the B600 as well, and so I would also be very interested to know the answer to this.

    By convolving the grating transmission, detector response and stellar blackbody I get something that is different from what I observe in the data, so perhaps the grating transmission information does need to be updated.

    If you don’t get a response in a week, I would say to email the Helpdesk if you haven’t already: https://www.gemini.edu/sciops/helpdesk/submit-general-helpdesk-request

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    #1525

    Catherine Huitson
    Participant

    It looks like Gemini are updating the website with new grating transmission measurements:

    http://www.gemini.edu/sciops/instruments/performance-monitoring/data-products/gmos-n-and-s/spectroscopic-throughput

    There are still a lot of them TBD but the B600 throughput for the South is there, measured in 2015. Hopefully the north will also come soon!

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