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"26642 results found.
- BeppoSAX NFI Observation of GRB990705
- GRB990704
- BeppoSAX NFI Observation of GRB990627 X-ray afterglow
- BeppoSAX: GRB990625
- X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
- optical observation of the X-ray/GRB transient SAX J0835.9+5118
- BeppoSAX: A new fast X-ray transient
- GRB990510: X-ray afterglow
- GRB 990510: BATSE Observations
- GRB 990506: BATSE Observations
- GRB990323 PRECISE IPN POSITION
- GRB990316: simultaneous optical observation
- GRB990316 - Optical null results
- ASM/IPN error box for GRB 990308 (BATSE #7457)
- GRB 990308a and GRB 990308b
- BATSE Resumes Normal Operations
- Search for Potential Images of GRB 990123
- Search for Potential Images of GRB 990123
- GRB990123, OSSE observations
- GRB 990123: Strong MeV CGRO-COMPTEL detection now posted on WWW
- GRB 990123: BATSE Observations
- GRB990123, early optical counterpart detection
- GRB990123, BeppoSAX WFC detection and NFI planned follow-up
- Possible identification of SN1999E with GRB980910
- GRB 980923 BATSE Observations
- GRB980703 - BeppoSAX/GRBM detection
- GRB 980703: BATSE Observations
- RXTE Observation of GRB 980706
- GRB980703: LOTIS observation at early times
- GRB 980703: ASM Position & Intensity
- GRB 980613: BATSE Observations
- SGR1627-41, BeppoSAX-GRBM detections
- Discovery of a new SGR source, SGR1627-41
- BATSE on-board GRB trigger change
- GRB980519 BATSE Observations
- BATSE on-board GRB trigger change
- GRB980519, BeppoSAX-WFC updated position
- GRB980519, BeppoSAX-WFC position
- GRB980425 BATSE observations
- GRB 971024: Refined analysis by USNOFS Observations
- GRB 971024: USNO Observations
- GRB 970925: BATSE Localization