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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"

26498 results found.

  1. IPN localization of GRB000126
  2. BATSE Observations of GRB000115
  3. GRB991216, UBVRIJHK field photometry
  4. GCN resumes full operations
  5. GRB 991216 VLBA Observations
  6. IPN error boxes for GRB991229
  7. GRB 991216: Detection of the Host and/or Absorber Galaxy
  8. IPN localization of GRB991226
  9. IPN error boxes for GRB991221
  10. GRB 991216 RXTE ASM Observations
  11. GRB 991216: Updated BATSE parameters
  12. GRB 991217 (SAX J2303.2+0015) Optical observations
  13. GRB991217/SAX J2303.2+0015, optical observations
  14. Chandra observation of the X-ray afterglow of GRB991216
  15. K observations of GRB991216
  16. SAX J2303.2+0015 Optical observations
  17. IR observations of GRB991216
  18. GRB 991217 (SAX J2303.2+0015) Optical observations
  19. GRB 991216 Radio Observations
  20. GRB 991208 Infrared Detection
  21. GRB991216
  22. GRB 991216--Summary of RXTE Observations
  23. GRB 991216 Optical Observations
  24. GRB 991216, optical observations
  25. GRB 991208 SAO-RAS Spectroscopy
  26. SAX J2303.2+0015: an x-ray/GRB?
  27. GRB 991216, Optical Transient
  28. GRB991216 ('Beethoven Burst') B, R, and K Observations
  29. GRB991216, infrared observations
  30. GRB 991208 optical observations
  31. GRB 991216 Optical Observation
  32. GRB 991208 Keck Spectroscopy
  33. GRB 991216: Extremely bright BATSE burst
  34. GRB991208, optical observations
  35. GRB 991208, Optical Observation
  36. GRB991208, optical observations
  37. IPN localization of GRB991208
  38. Optical Observations of GRB991105
  39. GRB991106: BeppoSAX/BATSE results
  40. GRB 991106, optical observations
  41. BeppoSAX NFI Observation of GRB991106
  42. GRB 991106, radio observations
  43. GRB991106: the first BeppoSAX short GRB detection?
  44. GRB 991105: BATSE Observations
  45. GRB 991106 Optical Observations
  46. GRB991106, optical observation at SAO-RAS
  47. GRB 991106, LOTIS Optical Observations
  48. GRB991105: SAX-GRBM/-WFC detection
  49. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  50. GRB 991014, Optical Observations
  51. GRB 991014 - BeppoSAX NFI observations
  52. GRB 991014, Optical Observations
  53. GRB 991014, radio observations
  54. GRB991014 BATSE Observations
  55. GRB 991014, Optical Observations
  56. GRB 991014, optical observations
  57. Super-LOTIS optical observation of GRB991014
  58. IPN localization of GRB991014 - CORRECTION
  59. IPN localization of GRB991014
  60. GRB 990907 optical observations
  61. Optical Observations of GRB990907
  62. GRB990907: BeppoSAX follow up and X-ray afterglow
  63. GRB990907 and 990908
  64. IPN localization of GRB990907
  65. GRB 990712, Optical Observation
  66. GRB990806 BeppoSAX follow up
  67. GRB990806: BATSE Observations
  68. GRB 990806 Optical observations
  69. GRB 990806, Optical Observations
  70. GRB 990806, optical observations
  71. GRB 990806, Optical Observations
  72. GRB990806 UBVRIJHK observations
  73. GRB990806: possible X-ray afterglow, BeppoSAX
  74. GRB 990712 Optical Observations
  75. GRB 990712
  76. Late-time HST/STIS Observations of GRB 990510
  77. Refined BeppoSAX-WFC position of GRB990712
  78. BeppoSAX NFI Observation of GRB990705
  79. BeppoSAX NFI Observation of GRB990705
  80. GRB 990705, R-band observations
  81. Updated IPN localization of GRB990705
  82. IPN localization of GRB990704
  83. IPN localization of GRB990705
  84. Infrared and Optical Observations of GRB990705
  85. GRB 990705, radio observations
  86. GRB990704: SAX-NFI results summary
  87. GRB990704 radio and optical observations
  88. BeppoSAX GRB990705: possible X-ray afterglow
  89. GRB 990704 X-ray Observations
  90. GRB990704
  91. GRB990704, optical observations
  92. Late-time HST/STIS Observation of GRB 990123
  93. Optical Observations of GRB 990506
  94. GRB990527 Optical Observations
  95. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  96. IPN error box for GRB990527
  97. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  98. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  99. X-ray/GRB 1SAX J0835.9+5118, Optical Observations
  100. X-ray/GRB 1SAX J0835.9+5118, Optical Observation

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