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"13 results found.
- GRB 111103B: optical upper limit
- GRB 111103B: optical upper limit of CrAO
- GRB 111103B: optical upper limit of Mt. Terskol observatory
- GRB 111103B: MITSuME Akeno Optical upper limits
- Konus-Wind observation of GRB 111103B
- GRB 111103B : WIYN 3.5m NIR observations
- GRB 111103B: Swift-XRT refined Analysis
- GRB111103B Swift/UVOT Upper Limits
- GRB 111103B: optical observations from TAU, Ka-Dar
- GRB 111103B: Enhanced Swift-XRT position
- GRB 111103B: Swift-BAT refined analysis
- GRB 111103B: optical observations
- GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source