A gravitationally lensed supernova SN 2022qmx at z=0.35

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  • #612121
    Robin Leadbeater
    Participant

    An interesting opportunity to see a supernova at 0.35 redshift, further than would normally be possible with typical amateur imaging. Currently at r mag 18.8, it is approximately 3 magnitudes brighter than normal due to gravitational lensing.
    https://www.wis-tns.org/astronotes/astronote/2022-180
    Hurry though it is already fading !
    https://alerce.online/object/ZTF22aaylnhq

    Cheers
    Robin

    #612132
    Paul Leyland
    Participant

    Still there. Imaging it right now. Eyeball guess is about 19.0 mag but there is a chance that I may have confused the star with a neighboring EDR3 entry of similar magnitude. Precise measurement should clear it up tomorrow.

    Pictures to follow.

    Paul

    #612133
    Robin Leadbeater
    Participant

    The ZTF cutouts on the alerce site are useful. There is a faint something (the parent galaxy ?) at the coordinates in the template but this is clearly brighter with the SN (about the same brightness as two other stars in the same string on 25th)

    (The clouds rolled in here as dusk fell)

    Robin

    #612136
    David Boyd
    Participant

    Here is a 35 x 60 sec stack of clear filtered images of the field. The SN is clearly visible still.

    David

    Attachments:
    #612138
    Paul Leyland
    Participant

    And here is mine. About an hour in total unfiltered. Extremely crude stacking. I am sure a much better image will become available.

    • This reply was modified 1 month ago by Paul Leyland. Reason: Fix typuo
    Attachments:
    #612144
    Paul Leyland
    Participant

    Some crude photometry has now been done. For comparisons 100 stars within 2 arcminutes of 2022qmx were searched in Gaia EDR3; their positions, G magnitudes and errors therein were saved. These and 2022qmx were analyzed with APT 2.8.2

    The magnitude at JD 2459817.361, aka 2022-08-25 20:40 UT, is reported as 20.02 (0.02).

    Crude, because my images were unfiltered but have been shown to be a decent match to Gaia G by and large.

    #612163
    Robin Leadbeater
    Participant

    Finally caught it tonight
    40×20 sec clear

    #612616
    Robin Leadbeater
    Participant

    It has now been imaged by HST and resolved into four lensed components
    https://www.wis-tns.org/sites/default/files/astronotes_files/1052/note_color_wide.jpg
    from
    https://www.wis-tns.org/astronotes/astronote/2022-196

    Cheers
    Robin

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