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.
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"
40 results found.
- GRB 160327A: KAIT optical afterglow confirmation
- GRB 151027A: Maidanak optical observations
- 610 MHz detection of GRB 151027A with the GMRT
- GRB 151027A: SAO RAS and Mt. Terskol observations
- GRB151027A; Optical observations
- GMRT radio detection of GRB 151027A
- GRB 151027A: continued Mondy optical observations
- GRB 151027A: Hankasalmi optical observations
- GRB 151027A: Mondy optical observations
- GRB 151027A: Mt. Terskol observatory optical observation
- GRB 151027A: the missing GeV component
- GRB 151027A: Correction to GCN 18519
- GRB 151027A: optical follow-up observations
- GRB 151027A: Continued P60 Monitoring
- GRB 151027A: Optical counterpart detection
- GRB 151027A: MAXI/GSC detection
- GRB 151027A: SAO RAS optical observations
- GRB 151027A: NOT optical and NIR observations
- GRB 151027A: T100 observations
- Konus-Wind observation of GRB 151027A
- GRB 151027A : Xinglong TNT optical observation
- GRB 151027A: continued GMG observation
- GRB 151027A: LCOGT-McDonald afterglow observations
- GRB 151027A: VLA detection
- GRB 151027A: THO optical observations
- GRB 151027A: UVOT Observations
- GRB 151027A: Swift-BAT refined analysis
- GRB 151027A: Early RAPTOR Observations
- GRB 151027A: GMG observation
- GRB 151027A: Fermi GBM observation
- GRB 151027A: MITSuME Akeno Optical observation
- GRB 151027A: Swift-XRT refined Analysis
- GRB 151027A: Keck/HIRES redshift
- GRB 151027A: Weihai optical observations
- Tentative redshift for GRB 151027A from Swift-XRT data
- GRB 151027A: Enhanced Swift-XRT position
- GRB 151027A: P60 afterglow confirmation and rebrightening
- GRB 151027A : ISON-NM early optical detection
- GRB 151027A: KAIT optical afterglow confirmation
- GRB 151027A: Swift detection of a burst with a bright optical afterglow