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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"22 results found.
- GRB 100901A: TLS Observations: Break?
- GRB 071003: Keck spectroscopy
- GRB 070311, deep optical photometry
- GRB 070311, deep optical photometry
- GRB 070311: Late Central Engine Activity Optical Flare??
- GRB 070311: MDM Optical Monitoring
- VLA observation of GRB 070311
- GRB 070311: Tautenburg sees afterglow fading
- GRB 070311: Optical observation.
- GRB 070311: Optical Brightening
- GRB 070311: SARA upper limit
- GRB 070311: MDM Optical Follow-up
- GRB 070311: RAPTOR Detection of Optical Emission
- GRB070311: FRAM early follow-up limit
- GRB 070311: P60 Observations
- GRB 070311: MDM Optical Detection
- GRB 070311: Swift/UVOT Upper Limits
- GRB 070311: MITSuME Okayama Optical Observation
- GRB 070311: Swift-XRT refined analysis
- GRB 070311: PAIRITEL confirmation of variability of REM candidate
- GRB 070311: REM candidate afterglow
- GRB 070311: a long GRB detected by INTEGRAL