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.
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"
28681 results found.
- GRB980613 Optical Observations
- GRB 980703
- GRB980703 (I band observations)
- GRB 980703 H-band Observations
- GRB980703: radio source/optical transient
- BeppoSAX NFI observations of GRB 980703
- GRB980519 observation report
- Radio observations of SGRs
- GRB 980613 Near-IR observations
- GRB980613, optical observations
- GRB 980613: Optical transient and its host galaxy
- SGR1627-41, RXTE/ASM observations
- SGR1627-41, Refined IPN annulus location
- 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
- GRB980613 Optical Observations
- GRB980613 observations from Palomar
- GRB 980613 new optical/IR observations
- GRB971214 Secondary Standards
- GRB980519 Secondary Standards
- SGR1900+14
- GRB 980519 Optical Observations
- GRB980519 optical observations
- GRB980519 I-band observations
- GRB 980519
- GRB980519 optical observations
- GRB 980519 Optical Observations
- GRB980519 BATSE Observations
- GRB970519, optical follow-up at Schmidt Calern
- GRB980519 optical observations
- GRB980519 Optical Observations
- GRB980519 Optical Observations
- GRB980519 IPN POSITION
- GRB980519 Optical Observations
- GRB 980519 Optical Observations
- GRB980519 optical observations
- GRB980515, BeppoSAX IAUC to be submitted
- GRB980519, BeppoSAX-WFC updated position
- GRB 980425 Radio Light Curve
- GRB 980425 Brightness Temperature
- BSAX Observations of GRB980425 field
- IPN web site of GRBs
- GRB980425 BATSE observations
- SAX J0840.7+2248 Optical Observations
- GRB 980425 optical observations
- GRB980425: optical obs.
- GRB980425: Radio Observations
- GRB 980425 optical observations
- GRB980326, optical observations
- GRB980326, optical observations
- GRB980329, Fading IR counterpart to radio source
- GRByymmdd, Announcement of automation
- GRB980326 IPN annulus
- GRB980329
- GRB980329 Keck K-band observations
- GRB980329 sub-millimeter observations
- GRB980329 IPN annulus
- GRB980329 optical observations
- GRB980329 near-IR observations
- GRB980329 optical observations
- GRB980326 optical observations
- GRB980326 optical observations
- GRB970508 SAO RAS optical observations
- GRB 971214: Redshift from Keck Observations
- Near-IR follow-up on GRB 971227
- GRB971214: Keck R & I-band Observations
- GRB 971227: Optical Observations
- Optical Observations of the GRB 971227 field
- GRB971227: Plaskett R-band observations
- GRB 971227: Optical clarifications
- GRB971227: LOTIS observations
- GRB971214: Optical Observations and Calibrations
- Optical Observations of GRB 971214 at Keck
- GRB 971024: Refined analysis by USNOFS Observations
- GRB 971024: USNO Observations
- GRB 970925: BATSE Localization
- IRAS 18119-1342 and the possible new SGR
- GRB 970228: Keck/LRIS Optical Observations