[programming] access lsst data

[sdcorle1]

I am following the instructions for querying lsst data. Here is my code which works fine when I choose survey = 'ztf':

from alerce.core import Alerce

Initialize the client

alerce = Alerce()

Query objects from ZTF

lsst_objects = alerce.query_objects(
survey="lsst",
classifier="lc_classifier",

class_name="SN",

probability=0.8,

format="pandas"

)

print("lsst_objects = ", lsst_objects)

Get lightcurve for a specific ZTF object

if len(ztf_objects) > 0:
oid = ztf_objects.iloc[0]['oid']
lightcurve = alerce.query_lightcurve(
oid=oid,
survey="lsst",
format="json"
)
print("lightcurve = ", lightcurve)
# Get detections separately
detections = alerce.query_detections(
oid=oid,
survey="lsst",
format="pandas"
)
print("detections = ", detections)

but, when I run with survey = 'lsst', it errors out:

Traceback (most recent call last):
File "/Users/subercorley/Library/Mobile Documents/comappleCloudDocs/Projects/alerce/lsstaccess.py", line 7, in
lsst_objects = alerce.query_objects(
survey="lsst",
...<3 lines>...
format="pandas"
)
File "/opt/miniconda3/lib/python3.13/site-packages/alerce/common_search.py", line 75, in query_objects
return self.multisurvey_client.query_objects(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
survey, format=format, index=index, sort=sort, **kwargs
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "/opt/miniconda3/lib/python3.13/site-packages/alerce/ms_search.py", line 60, in query_objects
q = self._request(
"GET",
...<3 lines>...
response_field=None,
)
File "/opt/miniconda3/lib/python3.13/site-packages/alerce/utils.py", line 169, in _request
handle_error(resp, response_format)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/miniconda3/lib/python3.13/site-packages/alerce/exceptions.py", line 21, in handle_error
raise codes.get(code, APIError)(
message=message, code=code, data=data, response=response
)
alerce.exceptions.APIError: {'Error code': 500, 'Message': 'An error occurred', 'Data': {}}

Does the exception error mean that there is no lsst data or is there another issue?