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').
232 results found.
- GRB000424, UBVRI field photometry
- GRB000418, UBVRI field photometry update
- GRB 000429, optical observation
- GRB 000429, UBVRI field photometry
- GRB 000418, UBVRI field photometry
- GRB 000418, optical observation
- GRB 000408, optical observations
- GRB 991208, UBVRI field photometry
- GRB 000323, optical observations
- GRB 000313 - optical transient in the BATSE error box
- GRB 000307, BVRI Field Photometry
- GRB 000301C, UBVRI field photometry
- GRB 000115, BVRI field photometry
- GRB991216, UBVRIJHK field photometry
- GRB 991217 (SAX J2303.2+0015) Optical observations
- GRB 991217
- GRB 991216, Optical Transient
- GRB 991014, optical observations
- X-ray/GRB 1SAX J0835.9+5118, Optical Observation
- GRB 990123, optical monitoring
- GRB 990506, optical observations
- GRB 990506, optical observations
- GRB 990123, Field Photometry
- GRB981220, field photometry
- GRB980703 H-band Observations
- GRB 980703 H-band Observations
- SGR1900+14 field optical observations
- GRB971214 Secondary Standards
- GRB980519 Secondary Standards
- GRB971214: Optical Observations and Calibrations
- GRB 971214: USNOFS Observations Summary
- Possible new SGR from US Naval Observatory