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"26167 results found.
- GRB 100619A: Swift/UVOT Upper Limits
- GRB 100619A: Swift-XRT refind analysis
- GRB 100619A: Swift-BAT refined analysis
- GRB 100619A: Swift detection of a burst
- GRB 100615A: Gemini/NIRI Observations
- Fermi GBM trigger 100612038 is not a GRB
- GRB 100615A: Swift/UVOT Upper Limits
- GRB 100614A: Swift/UVOT Upper Limits
- GRB 100614A: NOT optical upper limits
- GRB 100614A: Swift-BAT refined analysis
- GRB 100615A: Fermi GBM detection
- GRB 100615A: Swift-BAT refined analysis
- GRB 100615A: Swift-XRT refined analysis
- GRB 100614A: Swift-XRT refined analysis
- GRB 100615A: GROND observations, upper limits
- GRB 100615A: PAIRITEL NIR Upper Limits
- GRB 100615A: Swift detection of a burst
- GRB 100614A: Liverpool Telescope Observations
- GRB 100614A: Swift detection of a burst
- GRB 100606A: Suzaku WAM observation of the prompt emission
- GRB 100606A: GROND observations
- Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
- Konus-Wind observation of GRB 100606A
- GRB 100606A: Swift/UVOT Upper Limits
- GRB 100606A Swift-XRT refined analysis
- GRB 100606A: Swift-BAT refined analysis
- Swift Trigger 424040 is not a GRB
- GRB 100606A: Swift detection of a burst
- Swift detection of outburst from the SFXT IGR J18410-0535
- GRB 100528A: GROND detection in all bands
- GRB100526B: GROND Upper limits
- GRB 100528A: Fermi GBM observation
- GRB 100526B: Swift-XRT confirmation of fading afterglow
- GRB 100526B: Swift/UVOT Upper Limits
- GRB 100526A: Swift/UVOT Upper Limits
- GRB 100526A: Swift XRT refined analysis
- GRB 100526B: Swift-BAT refined analysis
- GRB 100526B: Swift XRT/UVOT observations
- GRB 100526A: Swift-BAT refined analysis
- GRB 100526B: Swift detection of a probable GRB
- GRB 100526A: Swift detection of a burst
- Konus-Wind observation of GRB 100522A
- GRB100522A: Suzaku WAM observation of the prompt emission
- GRB 100418A: Subaru late-time optical imaging and spectroscopy
- Swift/UVOT observations of GRB100522A.
- GRB 100522A: Fermi GBM observation
- GRB 100522A: Swift XRT refined analysis
- GRB 100522A, Swift-BAT refined analysis
- GRB 100522A: BOOTES-2 optical limit
- GRB 100522A: Swift detection of a burst
- GRB 100518A: GROND afterglow observation and photo-z
- GRB 100518A: Swift/UVOT Upper Limits
- GRB 100518A: Swift-XRT refined analysis
- GRB 100518A: optical afterglow decay
- Update to the configuration of the Fermi-LAT onboard GRB search
- GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
- Swift-BAT trigger 422437 is not anything astrophysical
- Swift Trigger 422437 is probably not a GRB
- Fermi/GBM trigger 295791986 - unreliable location
- GRB 100517A: MASTER-Net wide field camera prompt optical observations
- GRB 100514A: Swift/UVOT Observations
- GRB 100514A: YNAO-GMG observations
- GRB 100514A: Swift XRT refined analysis
- GRB 100514A: Swift-BAT refined analysis
- GRB 100514A: Faulkes Telescope South observations
- GRB 100514A: Swift detection of a burst
- GRB 100513A: Faulkes Telescope South observations
- GRB 100513A: Swift/UVOT upper limits
- GRB 100513A, RIMOTS optical upper limits
- GRB 100513A: Swift-BAT refined analysis
- GRB 100513A: PAIRITEL NIR afterglow candidate
- GRB 100513A: Swift detection of a burst
- GRB 100510A: Fermi GBM detection/observation
- GRB 100511A: Fermi GBM detection/observation
- GRB 100511A: Super-LOTIS early observations
- Swift-BAT trigger 421695 is likely not astrophysical
- GRB 100510A: MAXI/GSC detection
- GRB 100511A, RIMOTS optical upper limits
- Trigger 421695: Swift detection of a possible burst
- GRB100508A: Further Swift/UVOT Observations
- GRB100503A: Suzaku WAM observation of the prompt emission
- GRB 100508A: GROND Detection of the optical afterglow
- GRB 100508A: Swift-XRT Refined analysis
- GRB 100508A: Swift-BAT refined analysis
- GRB100508A: Swift/UVOT Detection of the Afterglow
- GRB 100508A: ROTSE-III Optical Limits
- GRB 100508A: Swift detection of a burst
- Fermi Gamma-ray Burst Monitor trigger 294712621 is not a GRB
- 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: Swift/UVOT Observations
- GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
- GRB 100504A: GROND Upper limits
- GRB 100504A: Swift-BAT refined analysis
- GRB 100504A: SARA-South Upper Limit
- GRB 100503A: Fermi GBM detection
- GRB 100504A: UVOT-enhanced XRT position
- GRB 100504A: Swift detection of a burst
- Swift-BAT trigger 421072 is not astrophyical