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"42589 results found.
- GRB 130610A: VLT/UVES redshift
- GRB 130609B: Enhanced Swift-XRT position
- GRB 130610A: P60 Observations
- GRB 130610A: PAIRITEL NIR Afterglow Observations
- GRB 130610A: Skynet/PROMPT detection of the optical afterglow
- GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
- GRB 130610A: Swift detection of a burst with an optical counterpart
- GRB 130609B: Swift detection of a burst with an optical counterpart
- GRB 130606A - Liverpool Telescope and Faulkes Telescope North optical observations
- GRB 130609A: Fermi GBM observation
- GRB 130608A: Swift-XRT refined Analysis
- GRB 130609A: Swift-XRT refined Analysis
- GRB 130608A: RATIR Optical and NIR Observations
- GRB 130609A: Enhanced Swift-XRT position
- GRB 130609A, Swift-BAT refined analysis
- GRB 130608A: Swift-BAT refined analysis
- GRB 130608A: Enhanced Swift-XRT position
- GRB 130609A: RATIR Optical and NIR Observations
- GRB 130609A: P60 nondetection
- GRB130608A: BOOTES-2/TELMA upper limits
- GRB 130609A: Swift detection of a burst
- GRB 130608A: Swift detection of a burst
- GRB 130606A: Continued Skynet/PROMPT observations
- Swift Trigger 557674 was due to an onboard position error
- GRB 130606A: Continued RATIR Optical and NIR Monitoring
- GRB 130606B: AGILE-MCAL observation
- GRB 130606B: RATIR Optical and NIR Observations
- Swift Trigger 557674 is a probable new Galactic transient
- GRB 130606B: Swift-XRT observations
- GRB 130606A, Swift-BAT refined analysis
- GRB 130606A: TAROT Calern observatory early optical observations
- GRB 130606A: EVLA detection
- GRB 130606A: VLT/X-shooter redshift confirmation
- GRB 130606A: Skynet/PROMPT detection of the optical afterglow
- GRB 130606A: Swift/UVOT Upper Limits
- GRB 130603A: AAO optical observations
- GRB 130606A: Swift-XRT refined Analysis
- GRB 130606A: Enhanced Swift-XRT position
- Konus-Wind observation of GRB 130605A
- Konus-Wind observation of GRB 130606A
- GRB 130606A: GROND Detection of the Optical/NIR Afterglow
- GRB 130606A: AAO optical observations
- Trigger 557640: Swift detection of burst from SGR J1745-29
- GRB 130606A: P60 Observations
- Konus-Wind observation of GRB 130606B
- GRB 130606A: PAIRITEL NIR Afterglow Observations
- GRB 130606B; Fermi GBM observation
- GRB 130606A: LOAO IZY Observation
- GRB 130606A: RATIR r'-band Dropout
- GRB 130606A: MMT Spectroscopy
- GRB 130606A:T100 observations
- GRB 130606A: 10.4m GTC refined redshift z = 5.91
- GRB 130606B: Fermi-LAT detection of a bright hard burst
- GRB130606A: Montarrenti Observatory afterglow detection
- GRB 130606A: 10.4m GTC spectroscopy indicates z = 6.1
- Virtual Telescope observations of GRB 130606A
- GRB 130605A: Swift-XRT refined Analysis
- GRB 130605A: Swift-BAT refined analysis
- Swift Trigger 557466 is not astrophysical
- GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
- GRB 130606A: IRSF NIR Observation
- GRB 130606A: NOT afterglow detection
- GRB 130606A: optical afterglow with BOOTES-2/TELMA and 1.23m CAHA
- GRB 130606A: Swift detection of a burst
- GRB 130605A: Swift/UVOT Detection
- GRB 130604A: Swift-BAT refined analysis
- GRB 130605A: Continued Skynet/PROMPT observations
- GRB 130605A: TAROT La Silla observatory optical decay
- GRB 130605A: Skynet/PROMPT detection of a fading afterglow
- GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
- GRB 130605A: GROND afterglow candidate
- GRB 130605A: Swift detection of a burst
- GRB 130603B: rest-frame energetics in gamma-rays
- Konus-Wind observation of GRB 130603B
- GRB 130603B: MASTER-Net early observations and optical sloap limit
- GRB 130603B: AMI-LA 15GHz observations
- GRB 130604A: Swift/UVOT Upper Limits
- Swift Trigger 557466 is probably not real.
- GRB 130604A: Swift-XRT refined Analysis
- GRB 130604B: Fermi GBM detection
- GRB 130603B: RATIR Optical and NIR Observations
- GRB 130604A: Enhanced Swift-XRT position
- GRB 130604A: Gemini North Spectroscopy
- GRB 130603B: P60 Observations
- GRB130603B: Swift/UVOT detection
- GRB 130604A: further ISON-NM optical observation
- GRB 130603B: VLT/X-shooter redshift confirmation
- GRB 130604A: ISON-NM optical upper limit
- GRB 130604A: KAIT optical upper limit
- GRB 130604A: P60 optical afterglow candidate
- GRB 130604A: Swift detection of a burst
- GRB 130603B: 5.8 GHz VLA detection
- GRB 130603A: SON optical observations
- GRB 130603B: Swift-XRT refined Analysis
- GRB 130603B: Gemini Observations
- GRB 130603B: optical follow-up and independent GTC redshift determination and afterglow spectrum
- GRB 130603B: Magellan redshift confirmation
- GRB 130603B: Short GRB afterglow spectrum from GTC
- GRB 130603B: Afterglow detection from NOT
- GRB 130603B: WHT optical afterglow candidate