GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"14 results found.
- GRB 241104A: CALET Gamma-Ray Burst Monitor detection
- GRB 241104A: Swift-XRT observations
- GRB 241104A: Fermi GBM Observation
- GRB 241104A: The SVOM/VT candidate in GCN circular 38086 is not an astrophysical source
- GRB 241104A: Swift ToO observations
- GRB 241104A: NOT optical non-detection
- GRB 241104A: SVOM/VT optical candidate
- GRB 241104A/EP241104a: Optical upper limits with Kinder observations
- GRB 241104A: COLIBRÍ Upper Limits on the Optical Counterpart
- GRB 241104A: SVOM/GRM observation
- EP241104a: EP detection of GRB 241104A X-ray emission
- GRB 241104A : Detection and localization by SVOM/ECLAIRs
- Fermi GRB 241104A: Global MASTER-Net observations report
- GRB 241104A: Fermi GBM Final Real-time Localization