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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"20 results found.
- GRB 201221D: near-infrared observation with LBT
- GRB 201221D: 3.6m DOT optical observations
- GRB 201221D: SMA submm observation
- GRB 201221D: MMT MMIRS detection of marginally extended source
- GRB 201221D: LCOGT upper limits
- GRB 201221D: Fermi GBM detection
- GRB 201221D: Swift-BAT refined analysis
- GRB 201221D: Archival PS1 Imaging of the Putative Host Galaxy
- Short GRB201221D: High Redshift from OSIRIS/GTC
- Konus-Wind detection of GRB 201221D (short)
- GRB 201221D: Swift/UVOT Upper Limits
- GRB 201221D: Lowell Discovery Telescope afterglow observations
- GRB 201221D: FRAM-ORM optical limit
- GRB 201221D: Swift-XRT refined Analysis
- Swift GRB 201221D: Global MASTER-Net observations report
- GRB 201221D: Enhanced Swift-XRT position
- GRB 201221D: Nanshan/NEXT early optical upper limit
- GRB 201221D: candidate optical counterpart from the NOT
- GRB 201221D: Prompt enhanced Swift-XRT position
- GRB 201221D: Swift detection of a bright short burst