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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"

35258 results found.

  1. GRB000301C
  2. GRB 000301C : Optical Candidate
  3. GRB000301C: RXTE/ASM and IPN localizations
  4. GRB000226 [IPN Position]
  5. HST Observations of GRB 990712
  6. GRB 000214 near-IR observations
  7. GRB 000115 Optical observations
  8. GRB 000214, Radio Observations
  9. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  10. GRB 000115, BVRI field photometry
  11. IPN annulus for GRB000214
  12. BATSE GRB trigger criterion changed
  13. GRB000210 X-ray afterglow
  14. GRB000214: X-ray afterglow candidate
  15. BeppoSAX GRB000214 ("S. Valentine's day GRB")
  16. GRB 000210: BATSE Observations
  17. Optical observations of the Chandra X-ray source for GRB000210
  18. Chandra Observations of GRB000210 X-ray Afterglow
  19. IPN triangulation of GRB000210
  20. GRB 000201: TAROT optical observations
  21. GRB 000131 Optical Observations
  22. GRB000126 Optical Observations
  23. BATSE GRB trigger criteria changed
  24. GRB 991208, radio observations
  25. BATSE+IPN location of GRB000131
  26. IPN localization of GRB000131
  27. GRB 000126, optical observations
  28. GRB000126, optical observations
  29. BATSE location of GRB000126
  30. IPN localization of GRB000126
  31. GRB 000115 Optical observations
  32. BATSE Observations of GRB000115
  33. Second RXTE Observation of GRB 000115
  34. GRB991216, UBVRIJHK field photometry
  35. Single IPN error box for GRB991229
  36. GRB 991216 VLBA Observations
  37. BEPPOSAX GRBM Localization of GRB991226
  38. IPN error boxes for GRB991229
  39. GRB 991216: J band spectrophotometry
  40. GRB 991216: Detection of the Host and/or Absorber Galaxy
  41. IPN localization of GRB991226
  42. Single IPN error box for GRB991221
  43. IPN error boxes for GRB991221
  44. GRB 991216 RXTE ASM Observations
  45. IPN error box for GRB991216
  46. GRB 991216: Updated BATSE parameters
  47. Lowell/Perkins observation of GRB 991216
  48. GRB 991217 (SAX J2303.2+0015) Optical observations
  49. Chandra observation of the X-ray afterglow of GRB991216
  50. GRB 991216, optical observations
  51. GRB 991216 Optical Observations
  52. GRB 991216 Optical spectroscopy/imaging
  53. K observations of GRB991216
  54. GRB 991217 (SAX J2303.2+0015) Optical observations
  55. GRB991216 Spectroscopy
  56. Lowell/Perkins observation of GRB 991216
  57. GRB991216, optical observations
  58. Refined IPN localization of GRB991216
  59. GRB 991216 Radio Observations
  60. GRB 991217
  61. GRB 991208 Keck Spectroscopy
  62. GRB 991208 Infrared Detection
  63. GRB 991216--Summary of RXTE Observations
  64. GRB 991216 Optical Observations
  65. GRB 991216, optical observations
  66. GRB 991208 SAO-RAS Spectroscopy
  67. SAX J2303.2+0015: an x-ray/GRB?
  68. GRB 991216, Optical Transient
  69. GRB 991216, Optical Afterglow
  70. GRB 991216: Comparison with DPOSS images
  71. GRB 991208 optical observations
  72. Lowell/Perkins observation of GRB 991216
  73. GRB 991216 Optical Observation
  74. GRB 991208 Keck Spectroscopy
  75. GRB 991216: Extremely bright BATSE burst
  76. GRB991208, optical observations
  77. GRB 991208 Keck Spectroscopy
  78. GRB991208 - millimeter detection
  79. GRB 991208, Optical Observation
  80. GRB 991208 - OVRO detection
  81. GRB 991208 Optical Decay
  82. GRB 991208 optical observations
  83. GRB 991208 optical observations
  84. GRB 991208: Radio Observations
  85. IPN localization of GRB991208
  86. Optical Observations of GRB991105
  87. GRB991106: BeppoSAX/BATSE results
  88. GRB 991106, optical observations
  89. GRB991106, near-infrared observations
  90. BeppoSAX NFI Observation of GRB991106
  91. GRB 991106, radio observations
  92. GRB991106: the first BeppoSAX short GRB detection?
  93. GRB 991105: BATSE Observations
  94. IPN localization of GRB991105
  95. GRB 991106 Optical Observations
  96. GRB 991105, optical observations
  97. GRB991106, optical observation at SAO-RAS
  98. GRB 991106, LOTIS Optical Observations
  99. GRB 991106, optical observations
  100. BeppoSAX GRB Alert: GRB991106

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