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 100628A: Keck/LRIS Spectroscopy of Host Galaxy Candidate
- GRB 100628A: Near-IR sources coincident with the possible X-ray afterglow
- GRB 100628A: Chandra observations
- GRB 100628A: Swift XRT/UVOT refined analysis
- GRB 100628A: Second epoch of Magellan near-IR observations
- GRB 100628A: GROND optical/NIR observations of the host candidate
- GRB 100628A: Gemini North Observations
- GRB 100628A: Coincidence of source "G1" with revised XRT error circle
- GRB 100628A: Swift XRT refined position
- GRB 100628A: Magellan near-IR observations
- GRB 100628A: Swift/UVOT Upper Limits
- GRB 100628A: Swift XRT detection of a possible X-ray afterglow
- GRB 100628A: INTEGRAL SPI-ACS light curve
- GRB 100628A: Swift-BAT refined analysis
- GRB 100628A: Swift detection of a short hard burst