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Very wrong Sherlock classification #167

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smarttgit opened this issue Sep 8, 2024 · 0 comments
Open

Very wrong Sherlock classification #167

smarttgit opened this issue Sep 8, 2024 · 0 comments
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@smarttgit
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This was confirmed as the optical GRB afterglow of GRB 230827256 by https://gcn.nasa.gov/circulars/34574

https://lasair-ztf.lsst.ac.uk/objects/ZTF23abaanxz/

Sherlock did not classify it as an orphan, which would be the correct classification. Not sure what has happened, but the classification doesn't make any sense (even knowing how Sherlock has limitations depending on the input source catalogues). It gets Bright Star but then quotes a r=16 mag galaxy from PS1 and then a very large offset, but I don't even see a galaxy at that position.

Sherlock Contextual Classification
Prediction: Bright Star
The transient is possibly associated with 173342996603558725; an r=16.26 mag galaxy found in the PS1 catalogue. Its located 23.87" N, 43.05" W from the galaxy centre.

Better check to see if there is an ongoing bug that would prevent these coming through as orphans. Quite important for GRBs and FXTs.

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