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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"

35982 results found.

  1. GRB 991208 Keck Spectroscopy
  2. GRB991208 - millimeter detection
  3. GRB 991208, Optical Observation
  4. GRB 991208 - OVRO detection
  5. GRB 991208 Optical Decay
  6. GRB 991208 optical observations
  7. GRB 991208 optical observations
  8. GRB 991208: Radio Observations
  9. IPN localization of GRB991208
  10. Optical Observations of GRB991105
  11. GRB991106: BeppoSAX/BATSE results
  12. GRB 991106, optical observations
  13. GRB991106, near-infrared observations
  14. BeppoSAX NFI Observation of GRB991106
  15. GRB 991106, radio observations
  16. GRB991106: the first BeppoSAX short GRB detection?
  17. GRB 991105: BATSE Observations
  18. IPN localization of GRB991105
  19. GRB 991106 Optical Observations
  20. GRB 991105, optical observations
  21. GRB991106, optical observation at SAO-RAS
  22. GRB 991106, LOTIS Optical Observations
  23. GRB 991106, optical observations
  24. BeppoSAX GRB Alert: GRB991106
  25. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  26. GRB ALERT: GRB991105
  27. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  28. GRB 991014, Optical Observations
  29. GRB 991014 - BeppoSAX NFI observations
  30. GRB 991014, Optical Observations
  31. GRB 991014, radio observations
  32. GRB991014 BATSE Observations
  33. GRB 991014, Optical Observations
  34. GRB 991014, optical observations
  35. Super-LOTIS optical observation of GRB991014
  36. IPN/NFI error box for GRB991014
  37. IPN localization of GRB991014 - CORRECTION
  38. IPN localization of GRB991014
  39. BeppoSAX ALERT: GRB991014
  40. GRB 990915 optical observations
  41. GRB 990907 optical observations
  42. BATSE GRB trigger criteria
  43. Optical Observations of GRB990907
  44. IPN error box for GRB990915 (=BATSE 7766)
  45. IPN localization of BATSE #7766 (GRB990915)
  46. IPN localization of GRB990907
  47. GRB990908, another BeppoSAX-GRBM/WFC burst detection
  48. BeppoSAX MAIL n. 99/24: GRB ALERT: GRB990907
  49. GRB 990712 Late Optical Decay and Host Galaxy
  50. GRB 990712, Optical Observation
  51. GRB990806: BATSE Observations
  52. GRB 990806 Optical observations
  53. Optical Observations of GRB990806
  54. GRB 990806, Optical Observations
  55. GRB 990806, optical observations
  56. GRB 990806, Optical Observations
  57. GRB990806 UBVRIJHK observations
  58. BeppoSAX ALERT GRB990806: Summer GRB
  59. GRB 990712 Optical Observations
  60. GRB990705: No Evidence for Neutrino Signal
  61. GRB 990712 Optical Decay: Indication of Bright Host Galaxy
  62. VLT spectrum of GRB990712
  63. GRB 990712
  64. Late-time HST/STIS Observations of GRB 990510
  65. Refined BeppoSAX-WFC position of GRB990712
  66. GRB 990705, R-band observations
  67. Updated IPN localization of GRB990705
  68. IPN localization of GRB990704
  69. IPN localization of GRB990705
  70. Infrared and Optical Observations of GRB990705
  71. GRB 990705, radio observations
  72. GRB990704 radio and optical observations
  73. GRB 990704 X-ray Observations
  74. GRB 990704 Optical Observations
  75. GRB 990704, optical observations
  76. GRB990704
  77. GRB990705: Intriguing Positional Coincidences
  78. GRB990704
  79. GRB990704, optical observations
  80. Identification of a possible optical counterpart for GRB990704
  81. GRB990704
  82. Refined BeppoSAX-WFC position of GRB990704
  83. GRB990704: BeppoSAX detection
  84. Optical Observations of GRB990627
  85. GRB 990627, radio observations
  86. GRB990627: BeppoSAX-WFC final location
  87. BeppoSAX: GRB990625
  88. Late-time HST/STIS Observation of GRB 990123
  89. GRB 990506 - clarification to GCN 352
  90. GRB 990506 - Optical Observations
  91. Optical Observations of GRB 990506
  92. GRB 990506 Radio Transient
  93. GRB990527 Optical Observations
  94. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  95. IPN error box for GRB990527
  96. Late Afterglows of GRBs 990510, 990123
  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. GRB 990506 optical observation

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