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.
- KAIT Optical Upper Limits for GRB 120422A, 120724A, 120803B, 120911A, and 120923A
- GRB 120923A: Correction to GCN 13823
- GRB 120923A: JHK Observation
- GRB 120923A: optical upper limit
- GRB 120923A: RAPTOR Early Afterglow Limits
- GRB 120923A: MITSuME Okayama Optical upper limits
- GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
- GRB 120923A: CARMA Observations
- GRB 120923A: EVLA Observations
- GRB 120923A: Swift-XRT refined Analysis
- GRB 120923A: GROND Upper limits
- GRB 120923A: Swift-BAT refined analysis
- GRB 120923A: Swift/UVOT Upper Limit
- GRB 120923A: Gemini afterglow detection, high-z candidate
- GRB 120923A: Enhanced Swift-XRT position
- GRB 120923A: TAROT La Silla observatory optical observations
- GRB 120923A: ROTSE-III Optical Limits
- GRB 120923A: Swift detection of a burst