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"23572 results found.
- GRB 980703
- GRB980703 (I band observations)
- GRB 980703 H-band Observations
- GRB980703 (optical R observations)
- GRB980703: radio source/optical transient
- BeppoSAX NFI observations of GRB 980703
- GRB 980703: ASM Position & Intensity
- GRB980519 observation report
- SGR1900+14 field optical observations
- GRB 980613 Near-IR observations
- GRB980613, optical observations
- SGR1627-41, RXTE/ASM observations
- SGR1627-41, Refined IPN annulus location
- Reduced error box of SGR 1627-41
- GRB 980613: BATSE Observations
- SGR1627-41, BeppoSAX-GRBM detections
- GRB 980613 Optical Observations
- Discovery of a new SGR source, SGR1627-41
- GRB980613 observations from Palomar
- GRB 980613 new optical/IR observations
- GRB 980613 optical/IR obs.
- GRB980613 Near Infra-Red Observations
- GRB971214 Secondary Standards
- SGR 1900+14
- SGR1900+14
- SGR1900+14
- GRB980519 optical observations
- GRB980519 Optical Observations
- GRB980519 optical observations
- GRB980515, BeppoSAX IAUC to be submitted
- GRB 980425 Radio Light Curve
- GRB 980425 Brightness Temperature
- GRB980425 BATSE observations
- GRB980425: Radio Observations
- GRB 980425 optical observations
- report on BSAX observations of GRB980425
- GRB 980425 optical observations
- GRB980326, optical observations
- GRB980329, Fading IR counterpart to radio source
- GRByymmdd, Announcement of automation
- GRB980326 IPN annulus
- GRB980329
- GRB980329 IPN annulus
- GRB980329 optical observations
- GRB980329 near-IR observations
- GRB980329 near-IR observations
- GRB980329 optical observations
- GRB980329 infrared observations
- GRB980329 optical observations
- GRB980326 optical observations
- GRB980329 optical observations
- GRB980329 near IR observations
- GRB980329 optical observations
- GRB980329 optical observations
- GRB980329 optical observations
- GRB980326 optical observations
- GRB970508 SAO RAS optical observations
- Near-IR follow-up on GRB 971227
- GRB971227: Plaskett R-band observations
- GRB 971227: Optical clarifications
- GRB971227: Further CAHA R-band images
- GRB971227: LOTIS observations
- GRB 971227: CAHA R-band images
- GRB971214: Optical Observations and Calibrations
- GRB 971214: EUVE Observations
- GRB 971214: Redshift from Keck Optical Observations
- GRB 971214: Redshift from Keck Optical Observations
- Optical Observations of GRB 971214 at Keck
- GRB 971214: Optical Observations
- GRB 971024: Refined analysis by USNOFS Observations
- GRB 971024: USNO Observations
- IRAS 18119-1342 and the possible new SGR