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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').
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"

47 results found.

  1. GRB 210610B: Sintesz-Newton/CrAO optical observations
  2. GRB 210610B: Assy optical observations
  3. GRB 210610B: JCMT SCUBA-2 sub-mm observations
  4. GRB 210610B: T-CAT optical observations
  5. GRB 210610B: Swift/UVOT Detection
  6. GRB 210610B: CrAO/ZTSH continued optical observations and light curve
  7. GRB 210610B: AbAO optical observations
  8. GRB 210610B: REM optical/NIR observations of the afterglow
  9. GRB 210610B: iTelescope optical afterglow observations
  10. GRB 210610B: Further SAO RAS optical observations
  11. GRB 210610B: optical observations from Burke-Gaffney Observatory and Abbey Ridge Observatory
  12. GRB 210610B: Continued KAIT Optical Detection
  13. GRB 210610B: optical photometry of afterglow at INASAN/Simeiz
  14. GRB210610B: SARA-KP 0.9m Optical Afterglow Detection
  15. GRB 210610B: MITSuME Akeno optical observation
  16. GRB 210610B: VLA detection
  17. GRB 210610B: ALMA detection
  18. GRB 210610B: Liverpool Telescope optical photometry
  19. GRB 210610B: CrAO/ZTSH optical observations and light curve
  20. GRB 210610B: CrAO/ZTSH optical observations (correction to the GCN circ. 30212)
  21. GRB 210610A: CAHA 2.2m observations and light-curve behavior
  22. GRB 210610B: Swift-XRT refined Analysis
  23. GRB 210610B: Swift-BAT refined analysis
  24. GRB 210610B: Zwicky Transient Facility afterglow detection
  25. GRB 210610B: optical afterglow observations
  26. GRB 210610B: KAIT Optical Detection
  27. GRB 210610B: Spectroscopy and redshift confirmation with the Himalayan Chandra Telescope
  28. GRB 210610B: Fermi GBM detection
  29. GRB 210610B: University of Siena Observatory optical photometry of the afterglow
  30. Konus-Wind detection of GRB 210610B
  31. GRB 210610B: AGILE detection
  32. GRB 210610B: Redshift confirmation from GTC
  33. GRB 210610B: GOTO confirmation of afterglow detection
  34. GRB 210610B: RATIR Optical and NIR Observations
  35. GRB 210610B: Enhanced Swift-XRT position
  36. GRB 210610B: Photometry and phot-redshift from Legacy Survey, PanSTAR, and SDSS
  37. GRB 210610B: SAO RAS optical observations
  38. GRB 210610B: correction to GCN 30181
  39. GRB 210610B: NOT optical observations and tentative redshift
  40. GRB 210610B: iTelescope optical afterglow observations
  41. GRB 210610B: CrAO/ZTSh optical afterglow photometry
  42. GRB 210610B: BOOTES-2/TELMA optical observation
  43. Swift GRB 210610B: Global MASTER-Net observations report
  44. GRB 210610B: CrAO/ZTSh optical observations
  45. GRB 210610B: GIT optical detection
  46. GRB 210610B: BALROG localization (Fermi Trigger 645047470 / GRB 210610827)
  47. GRB 210610B: Swift detection of a burst with bright optical afterglow

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