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"3820 results found.
- GRB 981226 optical observations
- Optical Observations of GRB981226
- GRB 981226 - Infrared Observations
- SGR1900+14, BeppoSAX-GRBM observations
- SGR1627-41
- SGR1627-41, RXTE/ASM observations
- Reduced error box of SGR 1627-41
- SGR 1627-41
- Discovery of a new SGR source, SGR1627-41
- GRB980613 observations from Palomar
- SGR 1900+14
- SGR1900+14
- SGR1900+14
- BATSE on-board GRB trigger change
- GRB980329 IPN annulus
- Optical Observations of GRB 970508
- IRAS 18119-1342 and the possible new SGR
- Possible new SGR from US Naval Observatory
- RXTE Observations of SGR 1814-13
- GRB 970828: Palomar Observations