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"14 results found.
- GRB 180626A: TSHAO optical upper limit
- Konus-Wind observation of GRB 180626A
- GRB 180626A: RATIR Optical Observations
- GRB 180626A: Swift-BAT refined analysis
- GRB 180626A: KAIT Optical Upper Limit
- GRB 180626A: Swift-XRT refined Analysis
- GRB 180626A: COATLI Optical Detection
- GRB 180626A: Swift/UVOT Detection
- GRB 180626A: RATIR Optical Detection
- GRB 180626A: LCO Haleakala observations
- GRB 180626A: ISON-MN optical observations
- GRB 180626A: Enhanced Swift-XRT position
- GRB 180626A: A long GRB detected by INTEGRAL
- GRB 180626A: Swift detection of a burst with an optical counterpart