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"18 results found.
- GRB 220711B: CALET Gamma-Ray Burst Monitor detection
- Retraction of GRB 220711B: 10.4 m GTC(+EMIR) observations (GCN 32387)
- GRB 220711B: 10.4 m GTC(+EMIR) observations
- GRB 220711B: 10.4 m GTC(+EMIR) observations
- GRB 220711B, GROND observations
- GRB 220711B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
- GRB 220711B: GIT optical upper limits
- Fermi GRB 220711B: Global MASTER-Net observations report
- GRB 220712B: NOT optical afterglow confirmation
- GRB 220711B: Swift-BAT refined analysis
- GRB 220711B: Swift-XRT refined Analysis
- GRB 220711B: Swift/UVOT Upper Limits
- GRB 220711B: Enhanced Swift-XRT position
- GRB 220711B: Fermi GBM Detection
- GRB 220711B: NOT optical observations
- GRB 220711B: LCO Optical Upper Limits
- GRB 220711B: Swift detection of a burst
- GRB 220711B: Fermi GBM Final Real-time Localization