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"15 results found.
- GRB 100513A: CrAO optical observations
- GRB 100513A: MITSuME Akeno Optical Observation
- GRB 100513A: EVLA radio observation
- GRB 100513A: Faulkes Telescope South observations
- GRB 100513A: Swift/UVOT upper limits
- GRB 100513A, RIMOTS optical upper limits
- GRB 100513A: Swift XRT refined analysis
- GRB 100513A: Swift-BAT refined analysis
- GRB 100513A: Gemini/GMOS Spectroscopic Redshift
- GRB 100513A: Enhanced Swift-XRT position
- GRB 100513A: Lick observations and R-band dropout
- GRB 100513A: PAIRITEL continued observations and confirmation of fading
- GRB 100513A: SARA-N Upper Limit
- GRB 100513A: PAIRITEL NIR afterglow candidate
- GRB 100513A: Swift detection of a burst