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"17 results found.
- 3.6m Devasthal Optical Telescope observations of GRB 170428A
- GRB 170428A CALET Gamma-Ray Burst Monitor detection
- GRB 170428A: GTC spectroscopic redshift of candidate host galaxy
- GRB 170428A: 15 GHz upper limits from AMI
- GRB 170428A: TNG optical observations
- Short GRB 170428A: MASTER-OAFA final reduction of the optical observations
- GRB 170428A: DCT Imaging
- GRB 170428A: TAROT La Silla observatory optical observations
- GRB 170428A: RATIR Afterglow Confirmation
- GRB 170428A: GROND detection of the afterglow
- GRB 170428A: Swift/UVOT Upper Limits
- GRB 170428A: Xinglong 2.16-m upper limit and host galaxy candidate
- GRB 170428A: Swift-XRT refined Analysis
- GRB 170428A: Swift-BAT refined analysis
- Konus-Wind observation of GRB 170428A
- GRB 170428A: MASTER-OAFA early optical observations
- GRB 170428A: Swift detection of a short burst