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"15245 results found.
- GRB 980613: Detection of the probable host galaxy
- Reduced error box of SGR 1627-41
- SGR1627-41, BeppoSAX-GRBM detections
- GRB 980613 Optical Observations
- GRB 980613 optical observations
- Discovery of a new SGR source, SGR1627-41
- GRB980613 observations from Palomar
- GRB 980613 new optical/IR observations
- SGR 1900+14
- BATSE on-board GRB trigger change
- GRB 980519 Optical Observations
- GRB980519 optical observations
- GRB980519 I-band observations
- GRB970519, optical follow-up at Schmidt Calern
- GRB980519 optical observations
- GRB980519 Optical Observations
- GRB980519 IPN POSITION
- GRB980515, BeppoSAX IAUC to be submitted
- BATSE on-board GRB trigger change
- GRB 980425 Brightness Temperature
- BSAX Observations of GRB980425 field
- GRB980425 BATSE observations
- GRB980425: optical obs.
- GRB980326, optical observations
- GRB980329, Fading IR counterpart to radio source
- GRB980329 Keck K-band observations
- GRB980329 optical observations
- GRB980329 near-IR observations
- GRB980329 infrared observations
- GRB980329 optical observations
- GRB980329 near IR observations
- GRB980326 optical observations
- Optical Observations of GRB 970508
- GRB 971214: Redshift from Keck Observations
- GRB971227: Plaskett R-band observations
- GRB 971227: Optical clarifications
- GRB971214: Optical Observations and Calibrations
- GRB 971214: Apache Point Observatory Optical Observations
- GRB 971214: KPNO Optical Observations
- Optical Observations of GRB 971214 at Keck
- GRB 971214: Optical Observations
- Radio Observations of GRB 971214 at the VLA
- GRB 971024: KPNO Optical Observations
- GRB 970828: Palomar Observations
- GRB 970228: Keck/LRIS Optical Observations