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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"

27391 results found.

  1. GRB 000210: BATSE Observations
  2. Optical observations of the Chandra X-ray source for GRB000210
  3. GRB000210, Radio Observations
  4. IPN triangulation of GRB000210
  5. GRB000210: possible afterglow detection with BeppoSAX NFI
  6. GRB000201, Radio Observations
  7. GRB000210: BeppoSAX GRBM and WFC Detection
  8. SAX_WFC_GRB_NOTICE
  9. SAX_WFC_GRB_NOTICE
  10. GRB000201 Optical Observations
  11. GRB 000201: TAROT optical observations
  12. GRB 991208, radio observations
  13. BATSE+IPN location of GRB000131
  14. IPN localization of GRB000131
  15. GRB 000126, optical observations
  16. BATSE Observations of GRB000115
  17. Second RXTE Observation of GRB 000115
  18. GRB991216, UBVRIJHK field photometry
  19. GCN resumes full operations
  20. GRB 991216 VLBA Observations
  21. GRB 991216: J band spectrophotometry
  22. GRB 991216: Detection of the Host and/or Absorber Galaxy
  23. IPN localization of GRB991226
  24. GRB 991216 RXTE ASM Observations
  25. GRB 991216: Updated BATSE parameters
  26. GRB 991217 (SAX J2303.2+0015) Optical observations
  27. Chandra observation of the X-ray afterglow of GRB991216
  28. GRB 991216, optical observations
  29. GRB 991216 Optical spectroscopy/imaging
  30. SAX J2303.2+0015 Optical observations
  31. IR observations of GRB991216
  32. GRB 991217 (SAX J2303.2+0015) Optical observations
  33. GRB991216 Optical and infrared observations of Beethoven Burst
  34. GRB 991216 Radio Observations
  35. GRB 991208 Keck Spectroscopy
  36. GRB 991208 Infrared Detection
  37. GRB991216
  38. GRB 991216--Summary of RXTE Observations
  39. GRB 991216 Optical Observations
  40. GRB 991216, optical observations
  41. GRB 991208 SAO-RAS Spectroscopy
  42. SAX J2303.2+0015: an x-ray/GRB?
  43. GRB 991216, Optical Transient
  44. GRB991216 ('Beethoven Burst') B, R, and K Observations
  45. GRB991216, infrared observations
  46. GRB 991208 optical observations
  47. GRB 991216 Optical Observation
  48. GRB 991216: Extremely bright BATSE burst
  49. R-band Observations of GRB991208 at TNG
  50. GRB991208, optical observations
  51. GRB 991208, Optical Observation
  52. GRB991208, optical observations
  53. GRB 991208 optical observations
  54. Optical Observations of GRB991105
  55. GRB991106: BeppoSAX/BATSE results
  56. GRB991106, near-infrared observations
  57. BeppoSAX NFI Observation of GRB991106
  58. GRB 991106, radio observations
  59. GRB991106: the first BeppoSAX short GRB detection?
  60. GRB 991105: BATSE Observations
  61. GRB 991106 Optical Observations
  62. GRB991106, optical observation at SAO-RAS
  63. GRB 991106, LOTIS Optical Observations
  64. GRB991105: SAX-GRBM/-WFC detection
  65. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  66. GRB 991014, Optical Observations
  67. GRB 991014 - BeppoSAX NFI observations
  68. GRB 991014, radio observations
  69. GRB 991014, Optical Observations
  70. GRB 991014, optical observations
  71. GRB 990915 optical observations
  72. Optical Observations of GRB990907
  73. GRB990907: BeppoSAX follow up and X-ray afterglow
  74. GRB990907 and 990908
  75. GRB 990712 Late Optical Decay and Host Galaxy
  76. GRB990806 BeppoSAX follow up
  77. GRB990806: BATSE Observations
  78. GRB 990806 Optical observations
  79. GRB 990806, Optical Observations
  80. GRB 990806, optical observations
  81. GRB 990806, Optical Observations
  82. GRB990806 UBVRIJHK observations
  83. GRB 990712 Optical Observations
  84. GRB 990712
  85. Late-time HST/STIS Observations of GRB 990510
  86. BeppoSAX NFI Observation of GRB990705
  87. BeppoSAX NFI Observation of GRB990705
  88. GRB 990705, R-band observations
  89. Infrared and Optical Observations of GRB990705
  90. GRB990704: SAX-NFI results summary
  91. GRB990704 radio and optical observations
  92. GRB990704
  93. GRB990704, optical observations
  94. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  95. Optical Observations of GRB990627
  96. BeppoSAX: GRB990625
  97. Late-time HST/STIS Observation of GRB 990123
  98. Optical Observations of GRB 990506
  99. GRB990527 Optical Observations
  100. X-ray/GRB 1SAX J0835.9+5118, Optical Observation

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