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"18 results found.
- GRB120805A: Liverpool Telescope observations
- GRB 120521C redshift estimate
- GRB 120521C: EVLA Localization of Afterglow
- GRB 120521C: EVLA 22 GHz Detection
- GRB 120521C: Early Tautenburg limits
- GRB 120521C: EVLA 22 GHz Upper Limit
- GRB 120521C: Swift-XRT refined Analysis
- GRB 120521C: Swift-BAT refined analysis
- GRB 120521C: Keck Observations
- GRB 120521C: Swift/UVOT Upper Limits
- GRB 120521C: MASTER optical limit
- GRB 120521C: PAIRITEL NIR Upper Limits
- GRB 120521C: Enhanced Swift-XRT position
- GRB 120521C: BOOTES-1 optical observations
- GRB 120521C: WHT optical observations
- GRB 120521C - NOT optical limits
- GRB 120521C: TAROT Calern observatory optical observations
- GRB 120521C: Swift detection of a burst