GCN Circulars
GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"- GRB140215A: Skynet PROMPT Optical Observations
- GRB 140215A: KAIT Optical Detection
- GRB140215A: Prompt Observations with Discovery Channel Telescope
- GRB 140215A: Swift detection of a burst with optical counterpart
- GRB 140213A: Swift-BAT refined analysis
- GRB140206A: Discovery Channel Telescope Optical Detection
- GRB 140213A: Swift/UVOT Observations
- GRB 140213A: Fermi GBM Detection
- GRB 140213A: Swift-XRT refined Analysis
- GRB140213A: VLT/X-shooter redshift
- GRB 140213A: Enhanced Swift-XRT position
- GRB 140213A: GROND Detection of the Optical/NIR Afterglow
- GRB 140213A: Skynet R-COP Detection of Optical Afterglow
- GRB 140213A: Swift-XRT observations
- GRB 140213A: Swift/UVOT Detection
- GRB 140213A: Swift detection of a burst
- GRB140211A : Xinglong TNT upper limit
- Trigger 586482: Swift detection of GROJ1744-28
- Correction to GCN 18521 "GRB140209A: Swift/UVOT observations"
- GRB140209A: Swift/UVOT observations.
- GRB 140211A: Swift-BAT refined analysis
- GRB 140209A: Swift-XRT observations
- Konus-Wind observation of GRB 140209A
- GRB 140211A: MITSuME Okayama upper limits
- GRB 140211A: Swift detection of a burst
- GRB 140209A: Early RAPTOR Optical Detection
- GRB 140209A: Swift-BAT Spectral lag analysis
- GRB 140206A: Bassano Bresciano Observatory optical upper limit
- GRB 140209A, Swift-BAT refined analysis
- GRB 140209A: Fermi GBM observation
- GRB 140209A: optical observations
- GRB 140209A: P60 optical afterglow detection
- GRB 140209A: Swift detection of a burst
- GRB 140206A: Mondy optical observations
- GRB 140206A: Liverpool Telescope optical afterglow observations
- GRB 140206A, Swift-BAT refined analysis
- Konus-Wind observation of GRB 140206B
- GRB 140206A: MITSuME Akeno detection of the optical counterpart
- GRB 140206A: TNG redshift confirmation
- GRB 140206A: Optical Observations via Virtual Telescope
- GRB 140206A: NOT redshift
- GRB 140206A: TNG optical observations
- GRB 140206A: Swift-XRT refined Analysis
- GRB 140206A: T100 observations
- GRB 140206A: Fermi GBM detection
- GRB 140206A: Swift/UVOT Detection
- GRB 140206A: theoretical prediction of redshift and of supernova occurrence
- GRB 140206A: Enhanced Swift-XRT position
- GRB 140206A: ISON-Ussuriysk optical observations
- GRB 140206B: Fermi-LAT detection
- GRB 140206B: Fermi GBM detection
- GRB 140206A: Nanshan optical observations
- GRB 140206A: MASTER OT detection
- GRB 140206A: Swift/UVOT optical detection
- GRB140206A - Optical afterglow candidate
- GRB140206A: a long GRB detected by INTEGRAL
- GRB 140206A: Swift detection of a burst
- GRB 140129A: 5 GHz VLA observations
- GRB 140129A: Continued RATIR Optical and NIR Observations
- GRB 140129A: Khureltogot optical limit
- GRB 140129B: Swift/UVOT Detection
- GRB 140129A: Continued RATIR Optical and NIR Observations
- GRB 140102A: MITSuME Akeno Optical observation
- GRB 140129B: Swift-XRT refined Analysis
- GRB 140129B: MASTER OT early light curve
- GRB 140129A: CARMA early observations
- GRB 140129B, Swift-BAT refined analysis (probably not a short burst)
- GRB 140129A: P200 spectroscopy
- GRB140129A: RAPTOR Observations of the Early Afterglow
- GRB 140129A: MITSuME Okayama upper limits
- GRB 140129B: Enhanced Swift-XRT position
- GRB 140129A, Swift-BAT refined analysis
- GRB 140129A: Swift/UVOT Observations
- GRB 140129A: Swift-XRT refined Analysis
- GRB 140129B: MASTER OT confirmation
- GRB 140129B: Swift detection of a burst with an optical afterglow
- GRB 140129A: Enhanced Swift-XRT position
- GRB 140129A: ROTSE-III Detection of Optical Counterpart
- GRB 140129A: RATIR Optical and NIR Observations
- GRB 140129A: P60 optical afterglow detection
- GRB 140129A: Swift detection of a burst with an optical afterglow
- GRB 140122A/Fermi412093190: MASTER-Net early optical observations
- Fermi412093190: iPTF optical counterpart search
- GRB 140110A: Second Follow-up Swift-XRT Observation
- GRB 140114A: optical upper limit
- Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
- Konus-Wind observation of GRB 131215A
- GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
- GRB 140118A: RATIR Optical and NIR Observations
- GRB 140118A: Fermi GBM observation
- GRB 140118A, Swift-BAT refined analysis
- Swift Trigger 584155 is MAXI J1421-613
- GRB 140118A: Swift detection of a burst
- GRB 140110A: Further Swift-XRT Observation
- GRB 140103A: MASTER-Net early OT detection
- GRB 140103A: optical upper limit
- GRB 140108A: Mondy optical observations, refined analysis
- GRB 140114A: NOT afterglow observations
- GRB 140114A: Continued RATIR Optical and NIR Observations
- GRB 140114A: MITSuME Okayama upper limits