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"20 results found.
- Possible radio detection of GRB 140903A with the GMRT
- GRB 140903A: Chandra detection of the afterglow
- GRB 140903A: Confirmation of Optical Fading from Discovery Channel Telescope
- GRB 140903A: Possible optical variability
- GRB 140903A: NOT optical and NIR observations
- GRB 140903A: FTN observations
- GRB 140903A: ISON-Kislovodsk observations
- GRB 140903A: MAXI/GSC upper limit
- GRB 140903A: 6 GHz VLA detection
- GRB 140903A: Pan STARRS images of the field
- GRB 140903A: tentative spectroscopic redshift
- GRB 140903A: Swift/UVOT Upper Limits
- GRB 140903A: Swift-BAT Spectral lag analysis
- GRB 140903A: P60 Optical Observations
- GRB 140903A: Swift-BAT refined analysis
- GRB 140903A: Swift-XRT refined Analysis
- GRB 140903A: Coincident galaxy cluster in archival images
- GRB 140903A: Confirmed Swift detection of a short burst
- GRB 140903A: Preliminary Swift/XRT localization
- GRB 140903A: Swift detection of a possible burst