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"21 results found.
- GRB 050412: Chandra observations
- GRB 050412: Subaru observations
- GRB 050412: PROMPT VRcIc Observations
- GRB 050412: optical limit
- GRB 050412: optical observations
- GRB 050412: early Swift XRT analysis results
- GRB 050412 : XingLong optical observation
- GRB 050412: Swift-BAT refined analysis
- GRB 050412: ANU 2.3m observations
- GRB 050412: Early Optical/Ultraviolet Observations with
- GRB 050412: retraction of UVOT transient report
- GRB 050412: UVOT transient not in XRT error circle
- GRB 050412: Optical limit
- GRB 050412: LCO Optical Observations
- GRB 050412: Optical observations
- GRB 050412: Swift XRT Position
- GRB050412: optical limit before and during GRB
- GRB 050412: LCO optical observations
- Swift-BAT Detection of GRB 050412: A Bright, Long Burst
- GRB 050412: IR and Optical observations
- GRB 050412: IR Observations