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"21 results found.
- GRB 120404A: optical observations in Mondy observatory
- GRB 120404A: optical observations
- GRB 120404A, Optical Observations
- GRB 120404A: JCMT SCUBA-2 sub-mm observation
- GRB 120404A: SMARTS optical/IR observations
- GRB 120404A: EVLA Detection
- GRB 120404A: MASTER OT observations
- GRB 120404A: VLT/X-shooter redshift confirmation
- GRB 120404A: Swift/UVOT Detection
- GRB 120404A: MITSuME Ishigakijima Optical Observation
- GRB 120404A: MITSuME Okayama Optical Observation
- GRB 120404A: Swift-XRT refined Analysis
- GRB 120404A : TNT optical observation
- GRB 120404A: Swift-BAT refined analysis
- GRB 120404A: Enhanced Swift-XRT position
- GRB 120404A: Gemini-N Redshift correction
- GRB 120404A: Gemini-N Redshift
- GRB 120404A: MITSuME Akeno Optical upper limits
- GRB 120404A: MASTER early OT limit
- GRB 120404A: Faulkes Telescope North afterglow confirmation
- GRB 120404A: Swift detection of a burst with an optical counterpart