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"14 results found.
- VLA observation of GRB 070224
- GRB 070224: Optical afterglow confirmation
- GRB 070224: Swift/UVOT Upper Limits
- GRB070224: Magellan Imaging Observations
- GRB 070224: WHT K-band imaging
- GRB 070224: MDM Observations
- GRB 070224: SARA upper limit
- GRB070224: Swift-XRT Refined Analysis
- GRB 070224: optical afterglow candidate
- GRB 070224, Swift-BAT refined analysis
- GRB 070224: MASTER-Net refind analysis
- GRB 070224: MASTER-VWF-Kislovodsk observations
- GRB 070224: MASTER observations
- GRB 070224: Swift detection of a burst