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"11841 results found.
- GRB 100615A: GROND observations, upper limits
- GRB 100615A: Swift detection of a burst
- GRB 100614A: Swift detection of a burst
- Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
- Konus-Wind observation of GRB 100606A
- GRB 100606A Swift-XRT refined analysis
- GRB 100606A: Swift-BAT refined analysis
- GRB 100513A: CrAO optical observations
- Konus-Wind observation of GRB 100528A
- Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
- GRB 100528A: SuperAGILE Localization of a Long GRB
- GRB 100526A: Swift XRT refined analysis
- GRB 100526B: Swift XRT/UVOT observations
- GRB 100526A: Swift-BAT refined analysis
- GRB 100526A: Swift detection of a burst
- Konus-Wind observation of GRB 100522A
- GRB 100522A: Swift XRT refined analysis
- GRB 100522A: NIR observations from CAHA
- GRB 100522A: Swift detection of a burst
- GRB 100518A: Swift-XRT refined analysis
- Update to the configuration of the Fermi-LAT onboard GRB search
- GRB 100518A: Faulkes Telescope North Afterglow Candidate
- GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
- GRB 100518A: a long GRB detected with INTEGRAL
- Swift Trigger 422437 is probably not a GRB
- GRB 100513A: EVLA radio observation
- GRB 100514A: Swift XRT refined analysis
- GRB 100514A: MASTER-Net optical observations
- GRB 100514A: Swift detection of a burst
- GRB 100513A: Swift XRT refined analysis
- GRB 100513A: Swift detection of a burst
- Swift-BAT trigger 421695 is likely not astrophysical
- GRB 100511A, RIMOTS optical upper limits
- GRB 100508A: Swift-XRT Refined analysis
- GRB 100508A: Swift-BAT refined analysis
- GRB 100508A: ROTSE-III Optical Limits
- GRB 100508A: Swift detection of a burst
- Swift-BAT refined analysis of trigger 421262
- GRB 100504A: Fermi GBM observation
- An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
- GRB 100504A: GROND Upper limits
- GRB 100504A: SARA-South Upper Limit
- GRB 100504A: Swift detection of a burst
- INTEGRAL observations of Swift GRB trigger 421072
- GRB 100420A: Gemini discovery of infrared afterglow
- GRB 100420A: Terskol optical upper limit
- GRB 100418A: RTT150 optical observations
- Konus-Wind observation of GRB 100423A
- GRB 100418A: Terskol optical observations
- GRB 100425A: Swift XRT refined analysis
- GRB 100424A: Liverpool Telescope Upper Limits
- GRB 100425A: GROND afterglow observation
- GRB 100424A: D50 optical limits
- GRB 100424A: GROND Upper Limits
- GRB 100424A: Swift-XRT refined analysis
- GRB 100425A: Swift detection of a burst
- GRB 100424A, Swift-BAT refined analysis
- GRB 100420A: GRT Optical Observation
- GRB 100418A: ROVOR optical measurements at 35 hours
- Swift Trigger 420256: ROTSE-III Optical Limits
- Radio afterglow detection of GRB 100418A with the EVLA
- GRB 100418A: Continued PAIRITEL NIR Observations
- GRB 100418A: WSRT Radio Detection
- GRB 100418A: RTT150 optical observations
- GRB100420A: MITSuME optical upper limits
- GRB 100414A: CFHT optical observations
- GRB 100420A: SARA Upper Limits
- GRB 100418A: RTT150 observations during the optical afterglow maximum
- GRB 100418A: SMA submm detection
- GRB 100420A: ROTSE-III Optical Limits
- GRB 100418A: Swift-XRT Refined Analysis
- GRB100414A: SAO RAS optical observations
- GRB 100418A: ROTSE-III Optical Limits
- GRB 100418A: Swift detection of a burst with a possible optical afterglow
- GRB 100414A: Suzaku WAM observation of the prompt emission
- Konus-Wind observation of GRB 100414B
- GRB 100415A: MAXI/GSC detection of a probable GRB
- GRB 100414A: Fermi GBM detection
- GRB100414A: Fermi LAT detection
- Konus-Wind observation of GRB 100413A
- Tentative redshift of GRB100413A from X-ray data
- GRB 100413A: Swift-XRT Refined Analysis
- GRB 100413: xinglong TNT optical upper limit
- GRB 100413A: MASTER-Net optical observations
- GRB 100413A: Swift detection of a burst
- Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
- GRB100401A: GROND Upper Limits
- MASTER observations on the Swift second trigger on LS V +44 17
- GRB 100331B: Swift/XRT possible afterglow candidate
- GRB 100331B: SuperAGILE Localization of a Long GRB
- INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
- Konus-Wind observation of GRB 100324B
- GRB 100331A: A long GRB detected by INTEGRAL
- Konus-Wind observation of GRB 100322A
- Short X-ray Transient detected by MAXI/GSC
- Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
- GRB 100325A: Fermi LAT detection
- GRB 100324A: GROND observations
- SGR 1833-0832: Swift/UVOT Upper Limits
- SGR 1833-0832: Archival Chandra Observations