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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"

35256 results found.

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

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