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"5531 results found.
- GRB000508B, optical photometry
- Possible GRB-related phenomenon
- GRB 000408, optical observations
- GRB000326, Radio observations
- GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
- GRB000301C: RXTE/ASM and IPN localizations
- GRB991216, optical observations
- GRB 991216, optical observations
- GRB 991216, Optical Transient
- GRB 991216, Optical Afterglow
- GRB991216 ('Beethoven Burst') B, R, and K Observations
- GRB991216, infrared observations
- Lowell/Perkins observation of GRB 991216
- GRB 990806, Optical Observations
- Updated Astrometry for the IR Counterpart of GRB990705
- GRB 990705, R-band observations
- IPN localization of GRB990705
- Infrared and Optical Observations of GRB990705
- GRB 990705, radio observations
- Refined BeppoSAX-WFC position of GRB990704: Errata Corrige
- GRB990704, optical observations
- GRB990323 PRECISE IPN POSITION
- GRB 990316, Optical observations
- On the Lensing Interpretation of GRB 990123
- GRB990123, early optical counterpart detection
- GRB 981220 Optical observations
- GRB981220 B, R and I band observations
- GRB 981220:Optical Observations
- GRB980703 optical photometry
- GRB980703 optical followup
- SGR1900+14 field optical observations