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"24581 results found.
- GRB 170306B: Fermi GBM detection
- GRB 170306B: Fermi-LAT detection
- IPN Triangulation of GRB 170305A (short)
- LIGO/Virgo G275697: Further Swift-XRT sources
- GRB 170306A: LCO Cerro Tololo observations
- GRB170305A: Fermi GBM detection
- GRB 170304A: Fermi GBM observation
- LIGO/Virgo G275697: Further Swift-XRT sources
- LIGO/Virgo G275404: HAWC follow-up
- LIGO/Virgo G275697: Further Swift-XRT sources
- Konus-Wind observation of GRB 170228A
- LIGO/Virgo G275697: Additional iPTF Optical Transient Candidates
- LIGO/Virgo G275404: Additional iPTF Optical Transient Candidates
- LIGO/Virgo G275404: Nearby Galaxies in the Localization Volume
- LIGO/Virgo G275697: Fermi GBM Upper Limits
- LIGO/Virgo G275697: AstroSat CZTI upper limits
- LIGO/Virgo G268556, G270580, G274296, and G275404: Konus-Wind observations
- LIGO/Virgo G275697: SVOM/Mini-GWAC observations of the initial skymap
- LIGO/Virgo G275404: iPTF Optical Transient Candidates
- LIGO/Virgo G275404: Fermi GBM Upper Limits
- GRB 170228A: Fermi GBM observation
- GRB 170228A: Fermi-LAT detection
- LIGO/Virgo G275697: CALET Observations
- LIGO/Virgo G275697: MASTER automatic follow up detection
- LIGO/Virgo G275697: CNEOST optical observations
- LIGO/Virgo G274296 and G275404 : MAXI/GSC observations
- LIGO/Virgo G275404: Nearby Galaxies in the Localization Region
- LIGO/Virgo G275697: Fermi-LAT search for a high-energy gamma-ray counterpart
- LIGO/Virgo G275697: Konus-Wind observations
- LIGO/Virgo G275697: Swift/BAT data search
- LIGO/Virgo G275404: MASTER bright PSN detected on 27 Feb from the maximum of probability of LIGO localization
- LIGO/Virgo G275697: AGILE-GRID preliminary analysis
- LIGO/Virgo G275697: AGILE MCAL Observations
- LIGO/Virgo G275697: INTEGRAL search for a prompt gamma-ray counterpart
- LIGO/VIRGO G275697: Fermi GBM Observations
- LIGO/Virgo G275404: AstroSat CZTI upper limits
- LIGO/Virgo G275697 ANTARES search
- LIGO/Virgo G275697: IceCube neutrino observations
- LIGO/Virgo G275697: Identification of a GW CBC Candidate
- LIGO/Virgo G275404: MASTER OT is outside LIGO error region
- LIGO/Virgo G275404: Keck spectrum of MASTER OT J105958.00-115756.5
- LIGO/Virgo G275404: Fermi-LAT search for a high-energy gamma-ray counterpart
- LIGO/Virgo G275404: INTEGRAL search for a prompt gamma-ray counterpart
- LIGO/Virgo G275404: AGILE-GRID detection of a possible gamma-ray transient
- LIGO/Virgo G275404 ANTARES search
- LIGO/Virgo G275404: Swift/BAT data search
- LIGO/Virgo G275404: SVOM/Mini-GWAC: Observations of initial skymap
- LIGO/Virgo G274296: Swift/BAT data search
- LIGO/Virgo G275404: AGILE-GRID preliminary analysis
- LIGO/Virgo G275404: Fermi GBM Observations
- LIGO/Virgo G275404: AGILE MCAL observations
- LIGO/Virgo G275404: IceCube neutrino observations
- LIGO/Virgo G275404: Identification of a GW CBC Candidate
- LIGO/Virgo G275404: MASTER automatic follow up observations
- Konus-Wind observation of GRB 170222A
- LIGO/Virgo G274296: CALET Observations
- GRB 170222A: Swift-XRT observations
- GRB 170222A: Fermi GBM observation
- LIGO/Virgo G274296: HAWC follow-up
- LIGO/Virgo G274296: No change to estimate of LIGO false alarm probability
- IPN Triangulation of GRB 170222A (short/hard)
- GRB 170219A: POLAR Observation
- Swift Trigger 739517 is probably not a GRB
- LIGO/Virgo G274296: iPTF Optical Transient Candidates
- LIGO/Virgo G274296: ATLAS confirmation of the bright MASTER transient and earlier explosion date
- LIGO/Virgo G274296: Fermi-LAT search for a high-energy gamma-ray counterpart
- GRB 170219A: Fermi GBM observation
- LIGO/Virgo G274296: AstroSat CZTI upper limits
- LIGO/Virgo G274296 ANTARES search
- IPN Triangulation of GRB 170219A (short/hard)
- LIGO/Virgo G274296: CNEOST imaging coverage and an optical transient
- LIGO/Virgo G274296: Observations of initial skymap by project Mini-GWAC of SVOM
- LIGO/Virgo G274296: INTEGRAL search for a prompt gamma-ray counterpart
- LIGO/VIRGO G274296: Fermi GBM Observations
- LIGO/VIRGO G274296: AGILE-GRID preliminary analysis
- LIGO/Virgo G274296: Identification of a GW Burst Candidate
- Trigger 738728: Swift triggered on noise near NGC 4096
- GRB 170214A: GROND detection in all bands
- GRB 170214A: Swift-XRT observations
- Konus-Wind observation of GRB 170214A
- GRB 170214A: Fermi-LAT detection
- GRB 170214A: Fermi GBM detection
- GRB 170208B: SMARTS optical/IR observations
- LIGO/Virgo G270580: DLT40 follow-up observation
- Konus-Wind observation of GRB 170210A
- GRB 170210A: POLAR observation
- IBAS Trigger 7691 is not a GRB
- IPN Triangulation of GRB 170210A
- GRB 170210A: Fermi GBM observation
- Konus-Wind observation of GRB 170209A
- IPN Triangulation of GRB 170209A
- GRB 170208B: Swift-BAT refined analysis
- GRB 170208A: Swift-BAT refined analysis
- GRB 170209A: Fermi GBM Detection
- Fermi Trigger 508295323: MASTER-OAFA possible OT detection
- LIGO/Virgo G270580: AstroSat CZTI upper limits
- GRB 170208B WHT nIR candidate afterglow
- GRB 170208B: Fermi GBM Detection
- Konus-Wind observation of GRB 170208B
- Konus-Wind observation of GRB 170208A