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 120107A: Fermi GBM observation
- GRB 120106A: MITSuME Okayama Optical Observation (update)
- Konus-Wind observation of GRB 120107A
- IPN Triangulation of GRB 120107A
- GBM trigger 347620337 (GRB 120107A?) : High-energy photon emission in Fermi/LAT data
- GRB 120106A: Swift/UVOT Upper Limits
- GRB 120106A: Bassano Bresciano Observatory optical observations
- GRB 120106A: MITSuME Okayama Ks-band upper limit
- GRB 120106A: MASTER Early OT marginally detection
- GRB 120106A: Swift-XRT refined Analysis
- INTEGRAL Weak trigger #6433: GRT Optical Observation
- GRB 120106A: Swift-BAT refined analysis
- GRB 120106A: MITSuME Okayama Optical upper limits
- GRB 120106A: Enhanced Swift-XRT position
- GRB 120106A: TAROT Calern observatory optical observations
- GRB 120106A: MASTER-Tunka optical observations
- GRB 120106A: Swift detection of a burst
- GRB111228A :LOAO R-band Observations
- GRB 111225A, the review of the sky area in plate archives
- GRB 111222A, the review of the sky area in plate archives
- GRB 111222A: Fermi GBM observations
- GRB 111222A: Second Swift observation
- GRB111209A: ATCA detection at 5.5, 9, and 18GHz
- GRB111225A: RAPTOR Early Detection of the Optical Counterpart
- GRB 111211A: Detection of the SN with the 10.4m GTC
- GRB 120102A: Fermi GBM observation
- Konus-Wind observation of GRB 120102A
- GRB 120102A: Swift-BAT refined analysis
- GRB 111228A: optical observations in CrAO
- GRB 120102A: Swift-XRT refined Analysis
- GRB 120102A: Swift/UVOT Detection
- GRB 120102A: Enhanced Swift-XRT position
- GRB 120102A: Swift detection of a burst with an optical counterpart
- GRB 111225A: optical observations in CrAO
- GRB 111228A, optical observations
- GRB 111228A: LOAO Optical Observation
- Konus-Wind observation of GRB 111228A
- GRB 111228A: MASTER-Net optical photometry
- GRB 111228A: correction for GCN 12787
- GRB 111228A: Optical and NIR observations with Kanata telescope
- GRB 110915A, the review of the sky area in plate archives
- GRB 111228A: correction to GCN 12784
- GRB 111228A: SMARTS optical/IR afterglow observations
- GRB 111229A: Swift/UVOT Detection
- GRB 111229A: Faulkes Telescope South observations
- GRB 111229A: Swift-XRT refined Analysis
- GRB 111229A: Enhanced Swift-XRT position
- GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
- GRB111228A: Further GMG observations
- GRB 111229A: Gemini-South Redshift
- GRB 111229A: Swift-BAT refined analysis
- GRB 111229A: GROND afterglow candidate
- GRB 111229A: Swift detection of a burst
- GRB 111228A: Liverpool Telescope Observations
- GRB 111225A: Lightbuckets Optical Observations
- GRB 111228A: P60 Observations
- GRB 111228A: X-shooter spectroscopy
- GRB 111228A: T100 observations
- GRB111228A: MITSuME Akeno photometry of the optical afterglow
- GRB 111228A: GMG optical observation
- GRB 111228A: Swift-XRT refined Analysis
- GRB 111228A: NOT redshift
- GRB111228A: TNG spectroscopy analysis
- FERMI GRB111228.45: MASTER observations
- GRB 111228A: Gemini South Redshift
- GRB 111228A: PAIRITEL NIR Detection
- GRB 111228A: MMT Redshift
- GRB 111228A: TAROT La Silla observatory observations
- GRB 111228A: GROND observations
- GRB 111228A: MASTER OT observations
- GRB111228A: Errata of MITSuME Okayama about GRB name in GCNC 12743
- GRB 111228A: GRAS017 optical observations
- GRB 111228A: IAC80 BVI-band observations
- GRB 111228A: Swift/UVOT Detection
- GRB 111228A: Skynet/Dolomiti Optical Observations
- GRB 111228A: NOT optical observation
- GRB 111228A, Swift-BAT refined analysis
- GRB 111228A: optical observations
- GRB 111228A: Enhanced Swift-XRT position
- GRB 111228A: TAROT Calern observatory. OT decay stopped
- GRB 111228A, optical observations
- GRB 111228A: Fermi GBM observation
- GRB111228A: MITSuME Okayama Optical Observation
- GRB 111228A: TAROT Calern observatory. OT seems still bright
- GRB 111228A: Possible host galaxy in the SDSS arhive
- GRB 111225A, optical observations
- XMM-Newton observation of the short GRB 111020A
- GRB 111228A: Xinglong TNT confirms the optical afterglow
- GRB 111228A: Swift detection of a burst with an optical counterpart
- GRB 111205A: optical observations
- GRB 111225A: Swift/UVOT Observations
- GRB 111215A: Keck/LRIS Imaging
- GRB 111225A: Keck/LRIS Afterglow Photometry
- GRB 111222A : Suzaku WAM observation of the prompt emission
- GRB 111225A: PAIRITEL NIR Upper Limits
- GRB111225A: MITSuME Okayama optical upper limits
- GRB 111225A: GRT Optical Observation
- GRB 111225A: 1.23m CAHA optical observations
- GRB 111225A: Swift-XRT refined Analysis
- GRB 111225A, Swift-BAT refined analysis