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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"

17798 results found.

  1. GRB000210: BeppoSAX GRBM and WFC Detection
  2. GRB000201 Optical Observations
  3. GRB 000126, optical observations
  4. GRB991216, UBVRIJHK field photometry
  5. GCN resumes full operations
  6. GRB 991216: Detection of the Host and/or Absorber Galaxy
  7. IPN error box for GRB991216
  8. GRB 991217 (SAX J2303.2+0015) Optical observations
  9. Chandra observation of the X-ray afterglow of GRB991216
  10. SAX J2303.2+0015 Optical observations
  11. IR observations of GRB991216
  12. GRB 991217 (SAX J2303.2+0015) Optical observations
  13. GRB 991216 Radio Observations
  14. GRB 991208 Infrared Detection
  15. GRB991216
  16. GRB 991216--Summary of RXTE Observations
  17. GRB 991216 Optical Observations
  18. GRB 991216, optical observations
  19. GRB 991208 SAO-RAS Spectroscopy
  20. SAX J2303.2+0015: an x-ray/GRB?
  21. GRB 991216, Optical Transient
  22. GRB991216 ('Beethoven Burst') B, R, and K Observations
  23. GRB991216, infrared observations
  24. GRB 991208 optical observations
  25. GRB 991216 Optical Observation
  26. GRB 991216: Extremely bright BATSE burst
  27. GRB991208, optical observations
  28. GRB 991208, Optical Observation
  29. GRB991208, optical observations
  30. Optical Observations of GRB991105
  31. GRB991106: BeppoSAX/BATSE results
  32. BeppoSAX NFI Observation of GRB991106
  33. GRB 991106, radio observations
  34. GRB991106: the first BeppoSAX short GRB detection?
  35. GRB 991106 Optical Observations
  36. GRB991106, optical observation at SAO-RAS
  37. GRB 991106, LOTIS Optical Observations
  38. GRB991105: SAX-GRBM/-WFC detection
  39. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  40. GRB 991014, Optical Observations
  41. GRB 991014 - BeppoSAX NFI observations
  42. GRB 991014, radio observations
  43. GRB 991014, Optical Observations
  44. GRB 991014, optical observations
  45. Super-LOTIS optical observation of GRB991014
  46. Optical Observations of GRB990907
  47. GRB990907 and 990908
  48. GRB990806 BeppoSAX follow up
  49. GRB 990806 Optical observations
  50. GRB 990806, optical observations
  51. GRB 990806, Optical Observations
  52. GRB 990712 Optical Observations
  53. GRB 990712
  54. Late-time HST/STIS Observations of GRB 990510
  55. BeppoSAX NFI Observation of GRB990705
  56. BeppoSAX NFI Observation of GRB990705
  57. GRB 990705, R-band observations
  58. GRB990704: SAX-NFI results summary
  59. GRB990704 radio and optical observations
  60. GRB990704
  61. GRB990704, optical observations
  62. Late-time HST/STIS Observation of GRB 990123
  63. Optical Observations of GRB 990506
  64. GRB990527 Optical Observations
  65. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  66. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  67. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  68. X-ray/GRB 1SAX J0835.9+5118, Optical Observations
  69. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  70. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  71. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  72. radio observations of X-ray/GRB transient field
  73. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  74. Optical report on X-ray/GRB transient
  75. GRB 990510: optical linear polarization
  76. GRB 990510: optical observations
  77. GRB 990506 R band observations
  78. GRB 990510: BATSE Observations
  79. GRB 990510 optical observations
  80. GRB 990506 Radio Observations
  81. GRB 990123, optical monitoring
  82. GRB 990506, optical observations
  83. GRB 990506, Optical Observations
  84. GRB 990506 optical observations
  85. GRB 990506, optical observations
  86. GRB 990506, optical observations from +1 to +3 hours
  87. GRB 990506, optical observations
  88. GRB990506 observation plan
  89. GRB 970228: Redshift and properties of the host galaxy
  90. GRB 990316 Optical Observations
  91. GRB990316, Optical observations
  92. GRB 990316 optical observations
  93. GRB990316: simultaneous optical observation
  94. GRB 990123, Field Photometry
  95. GRB 990217 Optical Observations
  96. BATSE Flight Anomaly
  97. GRB990123 observations
  98. GRB990123, Optical Observation
  99. GRB 990123: Discovery of the Probable Host Galaxy
  100. GRB 990123: Reduced HST Images

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