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"8297 results found.
- GRB 081029: ROTSE-III Detection of Optical Counterpart
- GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
- GRB 081028: Swift detection of a burst
- GRB 081025: TLS upper limits
- GRB 081025 BAT refined analysis
- GRB 081025: Burst detection from Swift-BAT slew data
- GRB 081024: Swift detection of a burst
- Swift detection of a possible burst (trigger 332287)
- GRB 081017: REM early observations
- GRB 081016B: Swift detection of a burst
- GRB 081016: Swift-XRT candidate afterglow detection
- GRB 081008: Galaxy associated with z=1.967 absorber
- GRB 081011: Swift detection of a burst
- GRB 081008: Swift detection of a burst with optical afterglow
- GRB 081007: Swift detection of a burst with optical afterglow
- Trigger 330353: Swift detection of a Galactic short soft burst
- GRB081001: SuperAGILE Localization of a long GRB
- GRB 080928: Swift detection of a burst with an optical counterpart
- GRB 080920: Fermi GBM detection
- Swift trigger 325707: Swift/UVOT Upper Limits
- GRB 080916C: IRSF/SIRUS NIR Observation
- GRB 080916C: GROND Confirmation of the Optical Afterglow
- GRB 080916C: GROND Confirmation of the Optical Afterglow
- GRB 080919: Swift detection of a short burst
- SGR 0501+4516: preliminary results of the Suzaku ToO observation
- GRB 080916C: GROND Detection of the Optical Afterglow Candidate
- GRB 080916B: Swift UVOT Refined Analysis
- GRB 080916B, Swift-BAT refined analysis
- GRB 080916A: Swift XRT refined analysis
- GRB 080916: REM candidate afterglow
- GRB 080916: Swift detection of a burst with optical afterglow
- GRB 080915, Swift-BAT refined analysis
- GRB 080913: REM NIR early observations
- GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
- GRB 080913: Swift detection of a burst
- SGR J0501+4516: radio pulsar searches with GBT and WSRT
- GRB 080905A: MITSuME Akeno optical upper limits
- GRB 080905B: VLT redshift
- GRB 080906: Swift detection of a burst with optical afterglow
- GRB 080905B: Swift detection of a burst with possible optical counterpart
- GRB 080905: Swift detection of a probably-short burst
- GRB 080903: optical observations
- GRB 080903: Liverpool Telescope observations
- GRB 080903: Astrotel-Caucasus optical observations
- GRB 080903: Optical afterglow candidate
- GRB 080903: Swift detection of a burst
- Recent VLA non-detection of SGR 0501+4516
- SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
- nIR observations of SGR 0501+4516
- INTEGRAL ToO observation of SGR0501+4516
- Swift-BAT trigger 322590 is not a GRB
- VLA non-detection of SGR 0501+4516
- Swift trigger 322590: BAT detection of a possible burst
- GRB080825: Afterglow confirmation and redshift estimate
- GRB 080825B - optical counterpart candidate
- SGR 0501+4516: radio pulsar searches with GBT and WSRT
- SGR 0501+4516: WSRT Radio Observations
- GRB 080822B: MASTER optical observation
- SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
- Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
- GRB 080822: Swift detection of a short burst
- GRB 080810: Swift detection of a burst with a bright optical afterglow
- GRB 080804: ATCA Radio Observations
- GRB 080805, Swift-BAT refined analysis
- GRB080804: Gemini South redshift confirmation
- GRB 080805: Afterglow confirmation
- GRB 080805: GROND detection of possible afterglow
- GRB 080805: Swift detection of a burst
- GRB 080804: Swift detection of a burst with optical afterglow
- GRB 080804: ROTSE-III Detection of Optical Counterpart
- GRB 080802: Swift detection of a probable burst
- GRB 080727C: Swift detection of a burst
- GRB 080727B, Swift-BAT refined analysis
- GRB 080727B: REM prompt observations
- GRB 080727B: Swift detection of a bright burst
- GRB 080727: Swift detection of a burst
- GRB 080723A: optical upper limit
- GRB 080725: REM prompt observations
- GRB 080723B: AGILE GRID and MCAL results
- GRB 080723: Swift detection of a burst
- TNG/DOLORES redshift for GRB080721
- GRB 080721: UVOT Follow-Up Observations
- GRB 080721: Swift detection of a burst with a bright optical counterpart.
- Trigger 317393: Swift detection of a possible GRB
- Trigger 317205: Swift detection of an outburst from XTE J1701-407
- GRB 080714: Swift detection of a burst
- GRB 080702A: optical upper limit
- GRB 080710, Swift-BAT refined analysis
- GRB 080710: KAIT OA candidate
- GRB 080707: GROND Detection of the Optical Afterglow Candidate
- GRB 080707: Swift detection of a burst
- GRB 080703: UVOT Follow-Up Observation
- GRB 080703: Swift detection of a burst with optical afterglow
- GRB 080703A: ROTSE-III Detection of Optical Counterpart
- GRB 080702A: MITSuME Akeno optical upper limits
- GRB 080702B : Burst detected in BAT during Swift slew
- GRB 080702: Swift detection of a short burst
- GRB 080701A, Swift-BAT refined analysis
- Trigger 315630: Swift detection of a possible burst
- GRB 080625: Swift/UVOT Detection of an Optical Afterglow