I am pleased to share an update from the recent follow-up effort from Rubin Observatory targeting the localization region of gravitational-wave candidate event S251112cm.
We have submitted a new GCN Circular with details for all the ToO observations and relevant candidates.
All candidates have been processed using the standard LSST Science Pipelines, with a modification for a custom task to rewarp DECam templates to the Rubin WCS. For templates, we use a coadds from DES DR2, DECADE, and DELVE.
We have submitted candidate photometry of high confidence candidates to the Transient Name Server (TNS) under the designation 258636.
This dataset includes all relevant observations from Nov. 14 - Nov. 22, 2025. Photometry is accessible through TNS, and we encourage community efforts to cross-match transient candidates in this region, including observations from other facilities.
Delivering science-ready data products in early operations remains a complex, multi-stage process. Currently, we do not expect the ToO observations to be included in DP2. Despite this, we wanted to deliver photometry of candidates to the community to remain transparent and promote early science with Rubin observations.
Thank you to everyone who has been engaging with the analysis and follow-up planning. We welcome general discussion here, especially about linking these measurements to ongoing searches from other facilities. We will continue to post updates as additional results or community products become available.