A gravitationally lensed supernova SN 2022qmx at z=0.35

[Robin Leadbeater]

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

[Dr Paul Leyland]

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

[Robin Leadbeater]

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

• This reply was modified 2 years, 3 months ago by Robin Leadbeater.

Attachments:

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   sn2022qmx_ztf_202208265.png
   

[David Boyd]

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

David

Attachments:

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   ZTF22aaylnhq.png
   

[Dr Paul Leyland]

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 2 years, 3 months ago by Dr Paul Leyland. Reason: Fix typuo

Attachments:

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   2022qmx.png
   

[Dr Paul Leyland]

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.

[Robin Leadbeater]

Finally caught it tonight
40×20 sec clear

Attachments:

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   sn2022qmx_40x20s_crop_annot.png
   

[Robin Leadbeater]

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

• This reply was modified 2 years, 2 months ago by Robin Leadbeater.

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