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"18 results found.
- GRB 250322A: 10 GHz VLA radio upper limits
- GRB 250322A: GRANDMA/TNOT optical upper limits
- Konus-Wind detection of GRB 250322A (short)
- GRB 250322A: third epoch of NOT optical observations
- GRB 250322A: Swift-BAT refined analysis
- GRB 250322A: further NOT optical observations
- GRB 250322A: Swift/UVOT Upper Limits
- GRB 250322A: VLT/X-shooter redshift confirmation of the putative host galaxy
- GRB 250322A: Swift-XRT refined Analysis
- GRB 250322A: Gemini-North redshift of candidate host galaxy
- GRB 250322A: AstroSat CZTI detection of a short burst
- GRB 250322A: Gemini-South optical observations
- GRB 250322A: VLT optical observations
- GRB 250322A: VLT near-infrared observations
- GRB 250322A: NOT optical upper limits
- GRB 250322A: Enhanced Swift-XRT position
- GRB 250322A: MASTER optical observation
- GRB 250322A: Swift detection of a short burst