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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"

15684 results found.

  1. SGR1900+14 field optical observations
  2. GRB 980613 Near-IR observations
  3. GRB980613, optical observations
  4. GRB 980613: Optical transient and its host galaxy
  5. GRB 980613: Detection of the probable host galaxy
  6. GRB 980613 Optical Observations
  7. GRB 980613 optical observations
  8. GRB980613 Optical Observations
  9. GRB980613 observations from Palomar
  10. GRB 980613 new optical/IR observations
  11. GRB 980613 optical/IR obs.
  12. GRB980613 Near Infra-Red Observations
  13. GRB971214 Secondary Standards
  14. GRB980519 Secondary Standards
  15. SGR1900+14
  16. SGR1900+14
  17. GRB 980519 Optical Observations
  18. GRB980519 optical observations
  19. GRB980519 I-band observations
  20. GRB 980519
  21. GRB980519 optical observations
  22. GRB 980519 Optical Observations
  23. GRB970519, optical follow-up at Schmidt Calern
  24. GRB980519 optical observations
  25. GRB980519 Optical Observations
  26. GRB980519 Optical Observations
  27. GRB980519 IPN POSITION
  28. GRB980519 Optical Observations
  29. GRB 980519 Optical Observations
  30. GRB980519 optical observations
  31. GRB 980425 Radio Light Curve
  32. GRB 980425 Brightness Temperature
  33. SAX J0840.7+2248 Optical Observations
  34. GRB 980425 optical observations
  35. GRB980425: optical obs.
  36. GRB980425: Radio Observations
  37. GRB 980425 optical observations
  38. GRB 980425 optical observations
  39. GRB980326 X-ray Observations
  40. GRB980326, optical observations
  41. GRB980326, optical observations
  42. GRB980326 IPN annulus
  43. GRB980329
  44. GRB980329 Keck K-band observations
  45. GRB980329 IPN annulus
  46. GRB980329 optical observations
  47. GRB980329 optical observations
  48. GRB980329 infrared observations
  49. GRB980329 optical observations
  50. GRB980326 optical observations
  51. GRB980329 optical observations
  52. GRB980329 optical observations
  53. GRB980329 optical observations
  54. GRB980329 optical observations
  55. GRB980326 optical observations
  56. GRB980326 optical observations
  57. GRB980326 optical observations
  58. GRB980326 optical observations
  59. GRB970508 SAO RAS optical observations
  60. Optical Observations of GRB 970508
  61. GRB 971214: Redshift from Keck Observations
  62. Near-IR follow-up on GRB 971227
  63. GRB971214: Keck R & I-band Observations
  64. GRB 971227: Optical Observations
  65. Optical Observations of the GRB 971227 field
  66. Optical Observations on GRB 971227
  67. GRB971227: Plaskett R-band observations
  68. GRB 971227: Optical clarifications
  69. Optical Observations for GRB 971227
  70. GRB971227: Further CAHA R-band images
  71. GRB971227: LOTIS observations
  72. GRB 971227: Optical observations
  73. GRB971214: Optical Observations and Calibrations
  74. Sub-millimeter Observations of GRB 971214 at the JCMT
  75. GRB 971214: Redshift from Keck Optical Observations
  76. GRB 971214: Redshift from Keck Optical Observations
  77. GRB 971214: Apache Point Observatory Optical Observations
  78. GRB 971214: KPNO Optical Observations
  79. Optical Observations of GRB 971214 at Keck
  80. GRB 971214: Optical Observations
  81. GRB 971024: KPNO Optical Observations Summary
  82. GRB 971024: KPNO Optical Observations
  83. GRB 970828: Palomar Observations
  84. GRB 970228: Keck/LRIS Optical Observations

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