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"18 results found.
- GRB 090426: optical observations
- GRB 090426: GAO 150cm telescope Optical Observation
- GRB 090426: YNAO-GMG observations
- GRB 090426: R-band limit
- GRB 090426: Swift/BAT spectral lag results
- GRB 090426: VLT spectroscopy
- GRB 090426: GROND Observations of the Optical/NIR Afterglow
- GRB 090426: Near infrared observation with ISLE at OAO
- GRB 090426: Okayama MITSuME optical observation
- GRB 090426 Keck LRIS redshift
- GRB 090426: Swift-BAT refined analysis
- GRB 090426: Swift-XRT refined analysis
- GRB 090426: Enhanced Swift-XRT position
- GRB090426: Observation for Optical counterpart from MIRO
- GRB 090426, RIMOTS optical upper limits
- GRB 090426: inspection of SDSS images
- GRB 090426: TNT confimation of optical counterpart
- GRB 090426: Swift detection of a burst with an optical counterpart