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"- GRB 110422A: CQUEAN griz Observation
- GRB 110422A: THO optical observations
- GRB 110422A: Enhanced Swift-XRT position
- GRB 110422A: correction to the GCN circ. 11958
- GRB 110422A: TNG optical observations
- GRB 110422A: SAO RAS optical observations
- GRB 110422A: NOT optical observation
- GRB 110422A: MASTER earlier OT polarization observations
- GRB 110422A: Swift-BAT refined analysis
- GRB 110422A: Mondy optical observations
- GRB 110422A: Swift detection of a burst
- GRB 110328A/Swift J164449.3+573451: Maidanak Optical Observation
- GRB 110420B: Swift/UVOT Upper Limits
- GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
- GRB 110420B: Swift-XRT afterglow candidate retraction
- GRB 110420B: Fermi GBM observation
- Konus-Wind observation of GRB 110420A
- GRB 110420B: Spectral lag indicates short hard burst
- GRB 110420B, GROND observations
- GRB 110420A Swift/UVOT Observations
- GRB 110420B: Swift-XRT afterglow candidate
- GRB 110420B: Swift-BAT refined analysis
- GRB 110420A: Swift-BAT refined analysis
- GRB 110420B: Swift detection of a short hard burst
- GRB 110420A: Swift-XRT refined Analysis
- GRB 110420A: Enhanced Swift-XRT position
- GRB 110420A: Swift detection of a burst with optical counterpart
- GRB110414A: MITSuME Ishigakijima Optical upper limits
- GRB 110414A: GROND upper limits
- GRB110414A: MITSuME Okayama Optical upper limits
- GRB 110414A: Swift-BAT Refined Analysis
- GRB 110414A: Swift/UVOT Upper limits
- GRB 110414A: Swift-XRT refined Analysis
- GRB 110414A: Enhanced Swift-XRT position
- GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
- GRB 110414A : Faulkes Telescope North observations
- GRB 110414A: Swift detection of a burst
- GRB 110411A: PAIRITEL NIR Upper Limits
- GRB 110412A: Swift-BAT refined analysis
- GRB 110411A: optical limits from OSN
- GRB 110411A: Swift-XRT refined Analysis
- GRB 110412A: Fermi GBM observation
- GRB 110411A: Swift/UVOT Upper Limits
- GRB 110411A: MASTER prompt and follow-up optical limits
- GRB 110411A : Xinglong TNT OT candidate
- GRB 110412A: Swift detection of a burst
- GRB 110411A, Swift-BAT refined analysis
- GRB 110411A: Enhanced Swift-XRT position
- GRB 110411A: MASTER optical observations
- GRB 110411A: Swift detection of a burst
- GRB 110328A / Swift J164449.3+573451: R-band Monitoring
- GRB 110407A: Swift-XRT refined Analysis
- GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
- GRB 110407A:VLF observations on 20.27kHz
- GRB 110328A / Swift J164449.3+573451: optical observations
- GRB 110407A: SMARTS optical limit
- GRB 110328A / Swift J164449.3+573451: VLBA Observations
- GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
- GRB 110406A: Positional coincidence with NGC 404
- GRB 110407A: MASTER optical observations
- GRB110407A: UVOT Upper Limits
- GRB 110407A: GROND Detection of the Optical Afterglow
- GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
- GRB 110407A: NOT optical observations
- GRB 110407A: Enhanced Swift-XRT position
- GRB 110407A: Swift-BAT refined analysis
- GRB 100407A : Errata of afterglow position in GCN 11899
- IPN triangulation of the bright GRB110406A
- GRB 110407A : Lulin optical afterglow detection
- GRB 110407A : Xinglong TNT upper limit
- GRB 110407A: MASTER early optical observations
- GRB 110407A: Prompt enhanced Swift-XRT position
- GRB 110407A: Swift detection of a burst
- Konus-Wind observation of GRB 110406A
- Redshift of GRB 110402A theoretically estimated (revised)
- GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
- GRB 110406A: An exceptionally bright burst detected by INTEGRAL SPI-ACS
- GRB 110402A: fading optical afterglow
- Redshift of GRB 110402A theoretically estimated
- GRB 110402A: Suzaku WAM observation of the prompt emission
- GRB 110328/Swift J164449.3+573451: Chandra observations
- GRB 110402A: LOAO Optical Observation
- ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
- Comparison of ICSP VLF observation of GRB 090424 with satellite observations
- GRB 110328A / Swift J164449.3+573451: Keck LRIS R-band photometry
- GRB 110328A / Swift J164449.3+573451, HST Observations
- GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
- GRB 110402A: Konus-Wind spectral lags and detailed energetics
- GRB 110401A: Fermi GBM detection
- GRB 110402A: Fermi GBM detection
- GRB 110402A: optical observations in Mondy
- GRB 110402A afterglow observation
- GRB 110328A / Swift J164449.3+573451: Keck/DEIMOS Optical Spectroscopy
- GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
- GRB 110328A/Swift J164449.3+573451: SARA-N detection
- GRB 110402A: Swift/UVOT detection of afterglow candidate
- GRB 110402A: Spectral lag indicates short hard burst
- Konus-Wind observation of GRB 110402A
- GRB 110402A: Konkoly observations
- GRB 110328A: Konkoly observations.