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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"

35946 results found.

  1. GRB000210 X-ray afterglow
  2. GRB000214: X-ray afterglow candidate
  3. BeppoSAX GRB000214 ("S. Valentine's day GRB")
  4. GRB 000210: BATSE Observations
  5. Optical observations of the Chandra X-ray source for GRB000210
  6. Chandra Observations of GRB000210 X-ray Afterglow
  7. IPN triangulation of GRB000210
  8. GRB 000201: TAROT optical observations
  9. GRB 000131 Optical Observations
  10. GRB000126 Optical Observations
  11. BATSE GRB trigger criteria changed
  12. GRB 991208, radio observations
  13. BATSE+IPN location of GRB000131
  14. IPN localization of GRB000131
  15. GRB 000126, optical observations
  16. GRB000126, optical observations
  17. BATSE location of GRB000126
  18. IPN localization of GRB000126
  19. GRB 000115 Optical observations
  20. BATSE Observations of GRB000115
  21. Second RXTE Observation of GRB 000115
  22. GRB991216, UBVRIJHK field photometry
  23. Single IPN error box for GRB991229
  24. GRB 991216 VLBA Observations
  25. BEPPOSAX GRBM Localization of GRB991226
  26. IPN error boxes for GRB991229
  27. GRB 991216: J band spectrophotometry
  28. GRB 991216: Detection of the Host and/or Absorber Galaxy
  29. IPN localization of GRB991226
  30. Single IPN error box for GRB991221
  31. IPN error boxes for GRB991221
  32. GRB 991216 RXTE ASM Observations
  33. IPN error box for GRB991216
  34. GRB 991216: Updated BATSE parameters
  35. Lowell/Perkins observation of GRB 991216
  36. GRB 991217 (SAX J2303.2+0015) Optical observations
  37. Chandra observation of the X-ray afterglow of GRB991216
  38. GRB 991216, optical observations
  39. GRB 991216 Optical Observations
  40. GRB 991216 Optical spectroscopy/imaging
  41. K observations of GRB991216
  42. GRB 991217 (SAX J2303.2+0015) Optical observations
  43. GRB991216 Spectroscopy
  44. Lowell/Perkins observation of GRB 991216
  45. GRB991216, optical observations
  46. Refined IPN localization of GRB991216
  47. GRB 991216 Radio Observations
  48. GRB 991217
  49. GRB 991208 Keck Spectroscopy
  50. GRB 991208 Infrared Detection
  51. GRB 991216--Summary of RXTE Observations
  52. GRB 991216 Optical Observations
  53. GRB 991216, optical observations
  54. GRB 991208 SAO-RAS Spectroscopy
  55. SAX J2303.2+0015: an x-ray/GRB?
  56. GRB 991216, Optical Transient
  57. GRB 991216, Optical Afterglow
  58. GRB 991216: Comparison with DPOSS images
  59. GRB 991208 optical observations
  60. Lowell/Perkins observation of GRB 991216
  61. GRB 991216 Optical Observation
  62. GRB 991208 Keck Spectroscopy
  63. GRB 991216: Extremely bright BATSE burst
  64. GRB991208, optical observations
  65. GRB 991208 Keck Spectroscopy
  66. GRB991208 - millimeter detection
  67. GRB 991208, Optical Observation
  68. GRB 991208 - OVRO detection
  69. GRB 991208 Optical Decay
  70. GRB 991208 optical observations
  71. GRB 991208 optical observations
  72. GRB 991208: Radio Observations
  73. IPN localization of GRB991208
  74. Optical Observations of GRB991105
  75. GRB991106: BeppoSAX/BATSE results
  76. GRB 991106, optical observations
  77. GRB991106, near-infrared observations
  78. BeppoSAX NFI Observation of GRB991106
  79. GRB 991106, radio observations
  80. GRB991106: the first BeppoSAX short GRB detection?
  81. GRB 991105: BATSE Observations
  82. IPN localization of GRB991105
  83. GRB 991106 Optical Observations
  84. GRB 991105, optical observations
  85. GRB991106, optical observation at SAO-RAS
  86. GRB 991106, LOTIS Optical Observations
  87. GRB 991106, optical observations
  88. BeppoSAX GRB Alert: GRB991106
  89. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  90. GRB ALERT: GRB991105
  91. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  92. GRB 991014, Optical Observations
  93. GRB 991014 - BeppoSAX NFI observations
  94. GRB 991014, Optical Observations
  95. GRB 991014, radio observations
  96. GRB991014 BATSE Observations
  97. GRB 991014, Optical Observations
  98. GRB 991014, optical observations
  99. Super-LOTIS optical observation of GRB991014
  100. IPN/NFI error box for GRB991014

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