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"15 results found.
- GRB 171027A: KAIT Optical Upper Limit
- Konus-Wind observation of GRB 171027A
- GRB 171027A, Swift-BAT refined analysis
- GRB 171027A: Swift/UVOT Upper Limits
- GRB 171027A: Swift-XRT refined Analysis
- GRB 171027A: Enhanced Swift-XRT position
- GRB 171027A: RATIR Confirmation of Fading and Photo-z
- GRB 171027A: VLT optical upper limits
- GRB 171027A: LCO 1-m telescope observations
- GROND observations of GRB 171027A: correction
- GRB 171027A: RATIR Detection of a NIR Afterglow Candidate
- GROND observations of GRB 171027A
- GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
- GRB 171027A: Prompt enhanced Swift-XRT position
- GRB 171027A: Swift detection of a burst