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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"

24353 results found.

  1. GRB 981220
  2. GRB 981220, radio observations
  3. GRB981226 Optical Observation
  4. GRB 981220: BeppoSAX/GRBM results
  5. GRB981220 I-band Observations
  6. GRB981220 Optical Observations
  7. GRB 981220
  8. GRB 980326/Host Galaxy
  9. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  10. GRB 980923 BATSE Observations
  11. GRB970508 optical observations
  12. Optical Observations of the Host Galaxy of GRB 980519
  13. GRB980519, Optical Observations
  14. GRB980703 H-band Observations
  15. GRB980703: LOTIS observation at early times
  16. GRB 980703: ASM Position & Intensity
  17. GRB980519 observation report
  18. GRB980703 optical followup
  19. GRB980613, optical observations
  20. GRB 980613: BATSE Observations
  21. Discovery of a new SGR source, SGR1627-41
  22. GRB 980519 Optical Observations
  23. GRB 980519 Optical Observations
  24. GRB970519, optical follow-up at Schmidt Calern
  25. GRB980519 optical observations
  26. GRB980519 Optical Observations
  27. GRB980515, BeppoSAX IAUC to be submitted
  28. GRB980519, BeppoSAX-WFC updated position
  29. GRB 980425 Radio Light Curve
  30. GRB 980425 Brightness Temperature
  31. GRB 980329 ROSAT observation
  32. GRB980326, optical observations
  33. GRB980326, optical observations
  34. GRByymmdd, Announcement of automation
  35. GRB980329 sub-millimeter observations
  36. GRB980329 optical observations
  37. GRB980329 optical observations
  38. GRB980326 optical observations
  39. GRB980326 optical observations
  40. Optical Observations of GRB 970508
  41. GRB 971214: Redshift from Keck Observations
  42. Near-IR follow-up on GRB 971227
  43. Optical Observations of the GRB 971227 field
  44. Optical Observations on GRB 971227
  45. GRB 971214: Redshift from Keck Optical Observations
  46. GRB 971214: Redshift from Keck Optical Observations
  47. Optical Observations of GRB 971214 at Keck
  48. GRB 971214: USNOFS Observations Summary
  49. GRB 971024: Refined analysis by USNOFS Observations
  50. GRB 971024: USNO Observations
  51. GRB 970925: BATSE Localization
  52. IRAS 18119-1342 and the possible new SGR
  53. GRB 970828: Palomar Observations

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Download all Circulars as a .tar.gz archive (updated once a day):
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