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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"

39061 results found.

  1. GRB980425 BATSE observations
  2. SAX J0840.7+2248 Optical Observations
  3. GRB 980425 optical observations
  4. GRB980425: optical obs.
  5. GRB980425: Radio Observations
  6. GRB 980425 optical observations
  7. report on BSAX observations of GRB980425
  8. GRB 980425 optical observations
  9. GRB 980329 ROSAT observation
  10. GRB980326 X-ray Observations
  11. GRB980326, optical observations
  12. GRB980326, optical observations
  13. GRB980329, Fading IR counterpart to radio source
  14. GRByymmdd, Announcement of automation
  15. GRB980326 IPN annulus
  16. GRB980329 sub-millimeter observations
  17. GRB980329 IPN annulus
  18. GRB980329 near-IR observations
  19. GRB980326 optical observations
  20. GRB980329 optical observations
  21. GRB980329 VLA observations
  22. GRB980329 near IR observations
  23. GRB980329 optical observations
  24. GRB980329 optical observations
  25. GRB980326 optical observations
  26. GRB980326 optical observations
  27. GRB970508 SAO RAS optical observations
  28. Optical Observations of GRB 970508
  29. GRB 971214: Redshift from Keck Observations
  30. Near-IR follow-up on GRB 971227
  31. GRB971214: Keck R & I-band Observations
  32. GRB 971227: Optical Observations
  33. Optical Observations of the GRB 971227 field
  34. Optical Observations on GRB 971227
  35. GRB971227: Plaskett R-band observations
  36. GRB 971227: Optical clarifications
  37. Optical Observations for GRB 971227
  38. GRB971227: Further CAHA R-band images
  39. GRB971227: LOTIS observations
  40. GRB 971227: CAHA R-band images
  41. GRB 971227: Optical observations
  42. GRB971214: Optical Observations and Calibrations
  43. Sub-millimeter Observations of GRB 971214 at the JCMT
  44. GRB 971214: EUVE Observations
  45. GRB 971214: Redshift from Keck Optical Observations
  46. GRB 971214: Redshift from Keck Optical Observations
  47. GRB 971214: Apache Point Observatory Optical Observations
  48. GRB 971214: KPNO Optical Observations
  49. Optical Observations of GRB 971214 at Keck
  50. GRB 971214: Optical Observations
  51. Radio Observations of GRB 971214 at the VLA
  52. GRB 971214: USNOFS Observations Summary
  53. GRB 971024: KPNO Optical Observations Summary
  54. GRB 971024: Refined analysis by USNOFS Observations
  55. GRB 971024: KPNO Optical Observations
  56. GRB 971024: USNO Observations
  57. GRB 970925: BATSE Localization
  58. IRAS 18119-1342 and the possible new SGR
  59. Possible new SGR from US Naval Observatory
  60. GRB 970828: Palomar Observations
  61. GRB 970228: Keck/LRIS Optical Observations

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