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"20 results found.
- GRB 110503A optical observation
- GRB 110503A: TAROT Calern observatory optical observations
- GRB 110503A: Jet Break seen from TLS
- GRB 110503A optical observations
- Konus-Wind observation of GRB 110503A
- GRB 110503A: optical observation in CrAO
- GRB 110503A: R-band Detection
- GRB 110503A: Centimeter observation from EVLA
- GRB 110503A: Millimeter observation from SMA
- GRB 110503A: SARA-N Observations and Photometric Calibration
- GRB 110503A: Swift/UVOT Observations
- GRB 110503A: Swift-XRT refined Analysis
- GRB 110503A: PAIRITEL NIR Detection
- GRB 110503A: redshift confirmation from TNG
- GRB 110503A - TLS Afterglow Observations
- GRB 110503A: Swift-BAT refined analysis
- GRB 110503A: NOT afterglow photometry
- GRB 110503A: Redshift from 10.4m GTC
- GRB 110503A: Enhanced Swift-XRT position
- GRB 110503A: Swift detection of a burst with a bright optical counterpart