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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"

28049 results found.

  1. GRB 991216, Optical Transient
  2. GRB991216 ('Beethoven Burst') B, R, and K Observations
  3. GRB991216, infrared observations
  4. GRB 991208 optical observations
  5. GRB 991216 Optical Observation
  6. GRB 991216: Extremely bright BATSE burst
  7. R-band Observations of GRB991208 at TNG
  8. GRB991208, optical observations
  9. GRB 991208, Optical Observation
  10. GRB991208, optical observations
  11. GRB 991208 optical observations
  12. Optical Observations of GRB991105
  13. GRB991106: BeppoSAX/BATSE results
  14. GRB991106, near-infrared observations
  15. BeppoSAX NFI Observation of GRB991106
  16. GRB 991106, radio observations
  17. GRB991106: the first BeppoSAX short GRB detection?
  18. GRB 991105: BATSE Observations
  19. GRB 991106 Optical Observations
  20. GRB991106, optical observation at SAO-RAS
  21. GRB 991106, LOTIS Optical Observations
  22. GRB991105: SAX-GRBM/-WFC detection
  23. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  24. GRB 991014, Optical Observations
  25. GRB 991014 - BeppoSAX NFI observations
  26. GRB 991014, radio observations
  27. GRB 991014, Optical Observations
  28. GRB 991014, optical observations
  29. GRB 990915 optical observations
  30. Optical Observations of GRB990907
  31. GRB990907: BeppoSAX follow up and X-ray afterglow
  32. GRB990907 and 990908
  33. GRB 990712 Late Optical Decay and Host Galaxy
  34. GRB990806 BeppoSAX follow up
  35. GRB990806: BATSE Observations
  36. GRB 990806 Optical observations
  37. GRB 990806, Optical Observations
  38. GRB 990806, optical observations
  39. GRB 990806, Optical Observations
  40. GRB990806 UBVRIJHK observations
  41. GRB 990712 Optical Observations
  42. GRB 990712
  43. Late-time HST/STIS Observations of GRB 990510
  44. BeppoSAX NFI Observation of GRB990705
  45. BeppoSAX NFI Observation of GRB990705
  46. GRB 990705, R-band observations
  47. Infrared and Optical Observations of GRB990705
  48. GRB990704: SAX-NFI results summary
  49. GRB990704 radio and optical observations
  50. GRB990704
  51. GRB990704, optical observations
  52. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  53. Optical Observations of GRB990627
  54. BeppoSAX: GRB990625
  55. Late-time HST/STIS Observation of GRB 990123
  56. Optical Observations of GRB 990506
  57. GRB990527 Optical Observations
  58. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  59. Late Afterglows of GRBs 990510, 990123
  60. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  61. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  62. X-ray/GRB 1SAX J0835.9+5118, Optical Observations
  63. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  64. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  65. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  66. radio observations of X-ray/GRB transient field
  67. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  68. Optical report on X-ray/GRB transient
  69. radio detection of X-ray/GRB transient
  70. BeppoSAX: A new fast X-ray transient
  71. GRB 990510: optical observations
  72. GRB 990510: optical linear polarization
  73. GRB 990510: optical observations
  74. GRB990510: X-ray afterglow
  75. GRB 990510: Broad Band Break
  76. GRB 990510: BATSE Observations
  77. GRB 990510: BeppoSAX/GRBM observations
  78. GRB990510 optical observations
  79. GRB 990510 optical observations
  80. GRB 990506 Radio Observations
  81. GRB 990123, optical monitoring
  82. GRB 990506: BATSE Observations
  83. GRB 990506, optical observations
  84. GRB 990506, Optical Observations
  85. GRB 990506 optical observations
  86. GRB 990506, optical observations
  87. GRB 990506, armchair astronomy
  88. GRB 990506, optical observations from +1 to +3 hours
  89. GRB 990506, optical observations
  90. GRB990506 observation plan
  91. IPN localization for GRB990506
  92. GRB990323 PRECISE IPN POSITION
  93. GRB 990316 Optical Observations
  94. GRB 990316 optical observations
  95. GRB990316: simultaneous optical observation
  96. GRB990316 - Optical null results
  97. GRB990308 not a new SGR
  98. GRB 990308a and GRB 990308b
  99. GRB990308, Possible new SGR~0209+70
  100. GRB 990123, Field Photometry

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