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"11075 results found.
- GRB 090925: Fermi GBM detection
- GRB 090915: Swift-XRT detection of a fading X-ray counterpart
- GRB 090912: Swift detection of a burst
- GRB 090904B: Swift-BAT refined analysis
- GRB 090904A: ROTSE-III Optical Limits
- GRB090902B: Swift XRT refined analysis
- GRB 090902B: Fermi LAT and GBM refined analysis.
- GRB 090902B: Fermi LAT detection
- Konus-Wind observations of GRB 090831A
- Konus-Wind observations of GRB 090827
- GRB 090827: Swift XRT and UVOT observations
- Konus-Wind observations of GRB 090823
- GRB 090823 Long burst with IPN triangulation and BAT position
- GRB 090820B: Fermi GBM detection
- GRB 090820: Fermi GBM Detection of a bright burst.
- GRB 090817: aphotometry of USNO-B1.0 341-0096763
- GRB 090814A: Swift-XRT Team Refined Analysis
- GRB 090813: correction to GCN 9787
- GRB 090814: Swift detection of a burst
- GRB 090813: Swift-XRT refined analysis
- Konus-Wind observations of GRB090813
- GRB 090813: Liverpool Telescope afterglow confirmation
- GRB 090813: P60 Optical Afterglow Confirmation
- GRB 090812: Swift detection of a burst with an optical counterpart
- GRB 090809: Swift detection of a burst with a possible optical counterpart
- GRB 090807: Swift-XRT refined analysis
- GRB 090807: Swift detection of a burst
- IPN Triangulation and Konus-Wind observaions of GRB090727B
- GRB 090726: optical observation
- GRB 090709A : Quick look analysis of the Suzaku observation
- GRB 090728: Swift detection of a burst
- GRB 090727: Swift-BAT refined analysis
- GRB 090711: Fermi GBM detection
- GRB 090726: Swift-XRT Team refined analysis
- GRB 090726: Swift detection of a burst
- Konus-Wind and Konus-RF observations of GRB 090719
- Konus-RF and Konus-Wind observations of GRB 090718B
- Konus-Wind observations of bright hard GRB 090720B
- GRB 090720: Gemini-North Imaging and Optical Afterglow
- GRB 090720B: Fermi GBM detection
- Swift XRT and UVOT refned analysis of GRB 090720
- GRB 090720 Source found in ground processing of Swift-BAT data
- GRB 090720: Fermi GBM detection
- Konus-Wind observations of short/hard GRB 090715A
- GRB 090715A: Swift-BAT refined analysis
- Konus-Wind and Konus-RF observations of GRB 090715B
- GRB 090715B: Swift XRT Refined Analysis
- GRB 090715A: ROTSE-III Optical Limits
- Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
- GRB090713 optical limit by "Pi of the Sky"
- GRB 090621B: MTM-500 optical observations
- GRB 090709A: deep optical observation with the 10.4m GTC
- GRB 090709A: WHT LIRIS observations
- Konus-Wind and Konus-RF observations of GRB 090709A
- GRB 090709A: Swift XRT Refined Analysis
- GRB 090709A: Swift-BAT refined analysis
- GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
- GRB 090709: ROTSE-III Optical Limits
- GRB 090709: Swift detection of a bright burst
- GRB 090708: ROTSE-III Optical Limits
- GRB 090708: Swift detection of a burst
- GRB 090704: a long GRB found in INTEGRAL off-line analysis
- GRB 090706: Fermi GBM detection
- XRF 090702: a long soft GRB localized with INTEGRAL
- Konus-Wind observation of GRB 090626
- GRB 090628: Swift detection of a burst
- Fermi LAT observations of GRB 090626
- GRB 090618: SARA Second Epoch Observations
- GRB 090625B: a long GRB localized by INTEGRAL
- GRB 090623: Fermi GBM detection
- GRB 090621B: P60 Observations
- GRB 090620: Fermi GBM detecion
- Konus-Wind and Konus-RF observations of GRB 090618
- GRB 090621B: Swift-XRT refined analysis
- GRB 090621B: RTT150 optical observations
- GRB 090621B: Optical Observations
- GRB 090621A: Swift-BAT refined analysis
- GRB 090618 15GHz radio detection
- GRB090618: Swift-XRT team refined analysis
- GRB 090618: Lick/KAST Spectroscopy
- SGR 0418+5729 Fermi/GBM Detection of Pulsations
- Konus-RF observation of SGR burst 090605A
- Discovery of a new soft gamma repeater source, SGR 0418+5729
- GRB 090607: XRT Team Refined Analysis
- GRB 090607: Swift detection of a burst
- GRB 090528B: Suzaku WAM observation of the prompt emission
- GRB 090531B: ROTSE-III Optical Limits
- GRB 090530: break in light curve
- GRB090530: Swift XRT refined analysis
- Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?
- GRB 090530: Swift detection of a burst with an optical counterpart
- GRB 090529: optical observations
- GRB 090529: Xinglong TNT optical observation
- GRB 090529: Swift detection of a burst
- GRB 090520D: Fermi GBM detection
- GRB 090520C: Fermi GBM detection
- GRB 090520B: Fermi GBM detection
- GRB 090522 : Fermi GBM detection
- GRB 090518 - NOT upper limit
- GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis