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"19169 results found.
- GRB980703 optical photometry
- GRB980703 optical observations
- GRB980703 Transient Optical Follow-Up
- GRB980703: LOTIS observation at early times
- GRB980613 Optical Observations
- GRB980703 (optical R observations)
- BeppoSAX NFI observations of GRB 980703
- GRB 980703: ASM Position & Intensity
- GRB980703 optical followup
- Radio observations of SGRs
- SGR1900+14 field optical observations
- GRB 980613: Optical transient and its host galaxy
- SGR1627-41, RXTE/ASM observations
- GRB 980613: Detection of the probable host galaxy
- GRB 980613 Optical Observations
- GRB 980613 optical observations
- Discovery of a new SGR source, SGR1627-41
- GRB980613 Optical Observations
- GRB980613 observations from Palomar
- GRB 980613 optical/IR obs.
- GRB980613 Near Infra-Red Observations
- GRB980613, BeppoSAX WFC positions
- GRB971214 Secondary Standards
- GRB980519 Secondary Standards
- SGR1900+14
- SGR1900+14
- BATSE on-board GRB trigger change
- GRB 980519 Optical Observations
- GRB 980519
- GRB980519 optical observations
- GRB 980519 Optical Observations
- GRB970519, optical follow-up at Schmidt Calern
- GRB980519 Optical Observations
- GRB 980519 Optical Observations
- GRB980519 optical observations
- GRB980515, BeppoSAX IAUC to be submitted
- BATSE on-board GRB trigger change
- GRB980515: SAX-WFC updated position
- BSAX Observations of GRB980425 field
- IPN web site of GRBs
- SAX J0840.7+2248 Optical Observations
- GRB980425: optical obs.
- GRB980425: Radio Observations
- report on BSAX observations of GRB980425
- GRB980326 X-ray Observations
- GRB980326, optical observations
- GRB980326, optical observations
- GRB980329 Keck K-band observations
- GRB980329 sub-millimeter observations
- GRB980326 optical observations
- GRB980329 optical observations
- GRB980329 VLA observations
- GRB980329 optical observations
- GRB980326 optical observations
- GRB970508 SAO RAS optical observations
- Optical Observations of GRB 970508
- Near-IR follow-up on GRB 971227
- Optical Observations of the GRB 971227 field
- Optical Observations on GRB 971227
- GRB971227: Plaskett R-band observations
- GRB 971227: Optical clarifications
- GRB971227: Further CAHA R-band images
- GRB971227: LOTIS observations
- GRB971214: Optical Observations and Calibrations
- 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