# Alerts & Brokers **URL:** https://www.rubin.community/c/sci/alertsbrokers/46.md [Latest](https://www.rubin.community/latest.md) · [Categories](https://www.rubin.community/categories.md) · [Tags](https://www.rubin.community/tags.md) --- ## [About the Alerts & Brokers category](https://www.rubin.community/t/about-the-alerts-brokers-category/4504)
**Author:** [@MelissaGraham](https://www.rubin.community/u/MelissaGraham)\ **Replies:** 0
For technical and scientific discussions related to alerts and brokers. This includes alerts from the Rubin Observatory LSST, as well as other relevant surveys. Everyone should feel welcome to participate by posting new… --- ## [Rubin Simonyi Telescope Saturation Point](https://www.rubin.community/t/rubin-simonyi-telescope-saturation-point/12361)
**Author:** [@sdcorle1](https://www.rubin.community/u/sdcorle1)\ **Replies:** 0\ **Last updated:** [July 28, 2026, 4:09pm UTC](https://www.rubin.community/t/rubin-simonyi-telescope-saturation-point/12361 "2026-07-28T16:09:16Z")
I extracted 15 objects from the ALeRCE alerts database for study. These objects were chosen based upon their classification by ALeRCE as type = VS. For my purposes, I also extracted the relevant detections. To prepare f… --- ## [Updated reliability model deployed to Alert Production](https://www.rubin.community/t/updated-reliability-model-deployed-to-alert-production/12270)
**Author:** [@ebellm](https://www.rubin.community/u/ebellm)\ **Replies:** 0\ **Last updated:** [July 9, 2026, 10:43pm UTC](https://www.rubin.community/t/updated-reliability-model-deployed-to-alert-production/12270 "2026-07-09T22:43:23Z")
Starting tonight, Alert Production will use the v0.3 reliability model. DMTN-337 provides details on its training and performance compared to the prior v0.2 model. Its major advantage relative to the v0.2 model is that… --- ## [Starithm NovaTrace — real-time GCN alert platform, looking for feedback from the broker community](https://www.rubin.community/t/starithm-novatrace-real-time-gcn-alert-platform-looking-for-feedback-from-the-broker-community/11966)
**Author:** [@kushasahu7](https://www.rubin.community/u/kushasahu7)\ **Replies:** 20\ **Last updated:** [July 9, 2026, 9:55am UTC](https://www.rubin.community/t/starithm-novatrace-real-time-gcn-alert-platform-looking-for-feedback-from-the-broker-community/11966 "2026-07-09T09:55:23Z")
Hi all, I’m building NovaTrace (Starithm - Real-time Astronomical Event Intelligence Platform), a production platform that aggregates multi-messenger alerts from GCN in real time. Given the overlap with what alert broke… --- ## [Offset of g-band detections in the alert photometry](https://www.rubin.community/t/offset-of-g-band-detections-in-the-alert-photometry/12070)
**Author:** [@jannis.necker](https://www.rubin.community/u/jannis.necker)\ **Replies:** 1\ **Last updated:** [July 2, 2026, 11:27am UTC](https://www.rubin.community/t/offset-of-g-band-detections-in-the-alert-photometry/12070 "2026-07-02T11:27:52Z")
Hi, I am working on selecting nuclear candidate transients from the alert stream. I started noticing that there are a couple of objects where the g-band detections are spatially significantly offset from detections in o… --- ## [Expanding template coverage for Alert Production](https://www.rubin.community/t/expanding-template-coverage-for-alert-production/12024)
**Author:** [@ebellm](https://www.rubin.community/u/ebellm)\ **Replies:** 3\ **Last updated:** [June 11, 2026, 8:56pm UTC](https://www.rubin.community/t/expanding-template-coverage-for-alert-production/12024 "2026-06-11T20:56:06Z")
On May 21 we deployed a significant expansion to the template coverage available to Alert Production. We selected the best-covered subset of the templates generated as part of the forthcoming Data Preview 2, increasing … --- ## [Rotation in alert postage stamps and cutouts](https://www.rubin.community/t/rotation-in-alert-postage-stamps-and-cutouts/12042)
**Author:** [@deltasata](https://www.rubin.community/u/deltasata)\ **Replies:** 3\ **Last updated:** [June 3, 2026, 7:00am UTC](https://www.rubin.community/t/rotation-in-alert-postage-stamps-and-cutouts/12042 "2026-06-03T07:00:43Z")
I have two questions regarding the alerts and cutouts: 1. Rotation of postage stamps in alert packets I’ve noticed that the postage stamps included in alert packets appear to vary in orientation across visits, reflecti… --- ## [My pipeline caught comet C/2025 A4 in today’s Rubin alerts](https://www.rubin.community/t/my-pipeline-caught-comet-c-2025-a4-in-today-s-rubin-alerts/12027)
**Author:** [@LienaDreams](https://www.rubin.community/u/LienaDreams)\ **Replies:** 0\ **Last updated:** [May 22, 2026, 9:38pm UTC](https://www.rubin.community/t/my-pipeline-caught-comet-c-2025-a4-in-today-s-rubin-alerts/12027 "2026-05-22T21:38:41Z")
Today, for the first time, my pipeline in JupyterLab successfully identified a comet in Rubin alerts: C/2025 A4. It’s a great feeling, but I understand this is only a starting point. Important note: this was a single de… --- ## [DiaObject \`g\_psfFluxSigma\` meaning](https://www.rubin.community/t/diaobject-g-psffluxsigma-meaning/11903)
**Author:** [@ChrisFro](https://www.rubin.community/u/ChrisFro)\ **Replies:** 1\ **Last updated:** [April 24, 2026, 4:22pm UTC](https://www.rubin.community/t/diaobject-g-psffluxsigma-meaning/11903 "2026-04-24T16:22:45Z")
Hi, reposting this question from Lasair forum as recommended by Lasair dev. Is the column g\_psfFluxSigma in DiaObject the uncertainty on the latest g-band observation? LSST Schema browser says: ‘Standard deviation of t… --- ## [Early alerts visit-level information](https://www.rubin.community/t/early-alerts-visit-level-information/11899)
**Author:** [@jrob93](https://www.rubin.community/u/jrob93)\ **Replies:** 3\ **Last updated:** [April 24, 2026, 9:44am UTC](https://www.rubin.community/t/early-alerts-visit-level-information/11899 "2026-04-24T09:44:52Z")
Hi, I have been trying to use the available alerts to estimate where Rubin has been observing and if possible some metrics associated with each visit (e.g. seeing etc). Looking closer at the alert production database the… --- ## [Alerts and images of SLS and the Orion spacecraft](https://www.rubin.community/t/alerts-and-images-of-sls-and-the-orion-spacecraft/11821)
**Author:** [@rggerk](https://www.rubin.community/u/rggerk)\ **Replies:** 1\ **Last updated:** [April 5, 2026, 1:54pm UTC](https://www.rubin.community/t/alerts-and-images-of-sls-and-the-orion-spacecraft/11821 "2026-04-05T13:54:51Z")
Good morning! Do we have any alerts and images of the SLS and the Orion spacecraft? Thanks --- ## [Difference versus forced flux](https://www.rubin.community/t/difference-versus-forced-flux/11753)
**Author:** [@pjpessi](https://www.rubin.community/u/pjpessi)\ **Replies:** 2\ **Last updated:** [March 18, 2026, 5:21pm UTC](https://www.rubin.community/t/difference-versus-forced-flux/11753 "2026-03-18T17:21:15Z")
I see some brokers show two panels for LSST alerts, one with difference photometry, and the other with forced photometry. I would assume the forced magnitude come from the flux of the diaForcedSource, while difference m… --- ## [Using brokers to get solar system object alerts](https://www.rubin.community/t/using-brokers-to-get-solar-system-object-alerts/11628)
**Author:** [@jrob93](https://www.rubin.community/u/jrob93)\ **Replies:** 9\ **Last updated:** [March 14, 2026, 12:34am UTC](https://www.rubin.community/t/using-brokers-to-get-solar-system-object-alerts/11628 "2026-03-14T00:34:25Z")
Hi, it’s really cool to see LSST alerts in the brokers! I’ve been trying to navigate the broker ecosystem today and I was hoping to get some advice from broker developers/users (apologies if I’ve missed some obvious docu… --- ## [Photometric quality of alert photometry](https://www.rubin.community/t/photometric-quality-of-alert-photometry/11720)
**Author:** [@sjoert](https://www.rubin.community/u/sjoert)\ **Replies:** 1\ **Last updated:** [March 11, 2026, 4:59pm UTC](https://www.rubin.community/t/photometric-quality-of-alert-photometry/11720 "2026-03-11T16:59:17Z")
This question came up during the TVS TDE subgroup telecon. We noticed the photometric quality of the alerts, in particular at the fainter end, is not yet where it should be. For example this SN candidate: ANTARES Or lo… --- ## [How Are Resolved Alerts below 1" Separation Treated?](https://www.rubin.community/t/how-are-resolved-alerts-below-1-separation-treated/10779)
**Author:** [@hjortlund](https://www.rubin.community/u/hjortlund)\ **Replies:** 6\ **Last updated:** [October 29, 2025, 2:34am UTC](https://www.rubin.community/t/how-are-resolved-alerts-below-1-separation-treated/10779 "2025-10-29T02:34:14Z")
As far as I understand, DIA-Sources that occur within 1" of each other will be associated to the same DIA-Object. When we have strongly lensed transient, we may have multiple images that will be resolved and detected bu… --- ## [How is a diaSource associated to a diaObject/ssObject?](https://www.rubin.community/t/how-is-a-diasource-associated-to-a-diaobject-ssobject/10829)
**Author:** [@ireyes](https://www.rubin.community/u/ireyes)\ **Replies:** 1\ **Last updated:** [September 5, 2025, 1:35pm UTC](https://www.rubin.community/t/how-is-a-diasource-associated-to-a-diaobject-ssobject/10829 "2025-09-05T13:35:23Z")
Hi! I’m trying to understand the logic of the solar system object association in the alert pipeline. Some of that is explained in https://ldm-151.lsst.io but it would be great to have a flow chart where you receive a new… --- ## [Real/bogus classification for variable stars](https://www.rubin.community/t/real-bogus-classification-for-variable-stars/10761)
**Author:** [@kkruszynska](https://www.rubin.community/u/kkruszynska)\ **Replies:** 1\ **Last updated:** [August 6, 2025, 9:13pm UTC](https://www.rubin.community/t/real-bogus-classification-for-variable-stars/10761 "2025-08-06T21:13:49Z")
I have a couple of questions regarding the real/bogus classifier. From what I understood from Tatiana Acero-Cuellar’s talk at Rubin Community Workshop 2025, the classification of variable stars requires some work. The cu… --- ## [Alert information contained with the two (or three) visits per night](https://www.rubin.community/t/alert-information-contained-with-the-two-or-three-visits-per-night/10068)
**Author:** [@ssmartt](https://www.rubin.community/u/ssmartt)\ **Replies:** 4\ **Last updated:** [May 30, 2025, 4:45pm UTC](https://www.rubin.community/t/alert-information-contained-with-the-two-or-three-visits-per-night/10068 "2025-05-30T16:45:03Z")
We (Lasair team) were having a discussion today about linking the information contained in each event alert within a single night. Here’s a typical scenario and question Visit 1 (g-band) - a DIASource is detected and th… --- ## [Developing consensus: How can we identify likely extragalactic transients using fields in the alert packet?](https://www.rubin.community/t/developing-consensus-how-can-we-identify-likely-extragalactic-transients-using-fields-in-the-alert-packet/10062)
**Author:** [@hernandezc1](https://www.rubin.community/u/hernandezc1)\ **Replies:** 2\ **Last updated:** [May 13, 2025, 8:09am UTC](https://www.rubin.community/t/developing-consensus-how-can-we-identify-likely-extragalactic-transients-using-fields-in-the-alert-packet/10062 "2025-05-13T08:09:19Z")
There are fields in the latest LSST alert schema that are relevant in associating transients with their potential host galaxy: nearbyObj “Id of the closest nearby object\[s, 1-3\].” nearbyObjDist “Distances to nearbyOb… --- ## [APDB NearbyExtObject fields](https://www.rubin.community/t/apdb-nearbyextobject-fields/9851)
**Author:** [@rknop](https://www.rubin.community/u/rknop)\ **Replies:** 3\ **Last updated:** [May 1, 2025, 9:54pm UTC](https://www.rubin.community/t/apdb-nearbyextobject-fields/9851 "2025-05-01T21:54:36Z")
Looking at : Alert Production Database There are fields such as nearbyExtObj1, which are integers. What tables are these integers references into? The documentation says “DR Object”, which suggests to me that it will … --- ## [Performances of Alert Brokers](https://www.rubin.community/t/performances-of-alert-brokers/9677)
**Author:** [@j.aleksic](https://www.rubin.community/u/j.aleksic)\ **Replies:** 6\ **Last updated:** [March 26, 2025, 10:55am UTC](https://www.rubin.community/t/performances-of-alert-brokers/9677 "2025-03-26T10:55:27Z")
Dear colleagues So far, several brokers are developed and their functionalities are presented many times. However, is there some performance considerations about them? In RCW 2024, we are informed that “during Operatio… --- ## [How to access the full transient alert stream](https://www.rubin.community/t/how-to-access-the-full-transient-alert-stream/9844)
**Author:** [@siraj](https://www.rubin.community/u/siraj)\ **Replies:** 2\ **Last updated:** [March 12, 2025, 8:05am UTC](https://www.rubin.community/t/how-to-access-the-full-transient-alert-stream/9844 "2025-03-12T08:05:51Z")
LDM 612 makes it clear that individual science users will not be able to directly access the full LSST transient alert stream (there is limited bandwidth, so a small number of users will be able to directly access up to … --- ## [Schema evolution: use registry, or use well-known place?](https://www.rubin.community/t/schema-evolution-use-registry-or-use-well-known-place/8867)
**Author:** [@roy](https://www.rubin.community/u/roy)\ **Replies:** 3\ **Last updated:** [July 19, 2024, 7:35am UTC](https://www.rubin.community/t/schema-evolution-use-registry-or-use-well-known-place/8867 "2024-07-19T07:35:41Z")
Reading the Rubin alert packets requires a schema that is not part of the packet, but rather found elsewhere. The schema can be fetched automatically by the reading code through a “schema registry” (SR option), or fetche… --- ## [Alert schema changes](https://www.rubin.community/t/alert-schema-changes/8727)
**Author:** [@roy](https://www.rubin.community/u/roy)\ **Replies:** 2\ **Last updated:** [June 14, 2024, 7:07am UTC](https://www.rubin.community/t/alert-schema-changes/8727 "2024-06-14T07:07:48Z")
The Lasair team has a few questions about changes in the alert schema. We note that standard names have been adopted across all of diaSource, diaForcedSource, and diaNondetectionLimit, namely these six attributes: ra… --- ## [Update on Simulated Alert Stream?](https://www.rubin.community/t/update-on-simulated-alert-stream/8518)
**Author:** [@alec\_b612](https://www.rubin.community/u/alec_b612)\ **Replies:** 3\ **Last updated:** [April 25, 2024, 1:12pm UTC](https://www.rubin.community/t/update-on-simulated-alert-stream/8518 "2024-04-25T13:12:02Z")
Hello! This line from the latest news digest piqued my interest: The team was able to generate a full suite of science data products from the two data streams, including alerts from difference imaging, and demonstrate… --- ## [Connection tests questions](https://www.rubin.community/t/connection-tests-questions/8501)
**Author:** [@roy](https://www.rubin.community/u/roy)\ **Replies:** 1\ **Last updated:** [April 22, 2024, 5:48pm UTC](https://www.rubin.community/t/connection-tests-questions/8501 "2024-04-22T17:48:15Z")
Thanks for setting up the USDF connection tests, it will be a vital testbed! A couple of questions, that I am sure will be covered in the telecon: How will authentication handled for the connection tests? What kind of … --- ## [Pre-Operations Broker Integration Exercises](https://www.rubin.community/t/pre-operations-broker-integration-exercises/8147)
**Author:** [@ebellm](https://www.rubin.community/u/ebellm)\ **Replies:** 2\ **Last updated:** [February 23, 2024, 7:50pm UTC](https://www.rubin.community/t/pre-operations-broker-integration-exercises/8147 "2024-02-23T19:50:08Z")
RTN-010 summarizes the project’s current plans for broker integration ahead of LSST commissioning. Comments and questions are welcome. We are presently aiming to begin live connection tests from the USDF in January. --- ## [Ecosystem of Streaming Brokers](https://www.rubin.community/t/ecosystem-of-streaming-brokers/8224)
**Author:** [@roy](https://www.rubin.community/u/roy)\ **Replies:** 2\ **Last updated:** [February 1, 2024, 8:04am UTC](https://www.rubin.community/t/ecosystem-of-streaming-brokers/8224 "2024-02-01T08:04:43Z")
At the brokers meeting in Garching on 25 Jan, there was some talk of a standard API for brokers, to request information about an object or make a cone search. But perhaps we can go further, and think of an ecosystem of k… --- ## [How many forced sources?](https://www.rubin.community/t/how-many-forced-sources/8148)
**Author:** [@roy](https://www.rubin.community/u/roy)\ **Replies:** 2\ **Last updated:** [December 12, 2023, 5:34pm UTC](https://www.rubin.community/t/how-many-forced-sources/8148 "2023-12-12T17:34:41Z")
For DP0.2, the DiaObject table has 41 million objects, DiaSource has 162 million and ForcedSourceOnDiaObject 17 billion. Therefore each DiaObject has on average 4 DiaSources and 400 ForcedSourceOnDiaObject. The forced so… --- ## [DP0.2 converted to AVRO alerts](https://www.rubin.community/t/dp0-2-converted-to-avro-alerts/8059)
**Author:** [@roy](https://www.rubin.community/u/roy)\ **Replies:** 1\ **Last updated:** [November 8, 2023, 4:08pm UTC](https://www.rubin.community/t/dp0-2-converted-to-avro-alerts/8059 "2023-11-08T16:08:44Z")
I understand that all or part of the DP0.2 simulated data will be converted to AVRO alerts so that Lasair and other brokers can feed from the stream. In the UK, we will ingest all or part of DP0.2 to our version of the S… [Next page](https://www.rubin.community/c/sci/alertsbrokers/46.md?page=1)