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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"

35259 results found.

  1. GRB000301c, near-infrared observations
  2. GRB000301C
  3. GRB 000301C : Optical Candidate
  4. GRB000301C: RXTE/ASM and IPN localizations
  5. GRB000226 [IPN Position]
  6. HST Observations of GRB 990712
  7. GRB 000214 near-IR observations
  8. GRB 000115 Optical observations
  9. GRB 000214, Radio Observations
  10. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  11. GRB 000115, BVRI field photometry
  12. IPN annulus for GRB000214
  13. BATSE GRB trigger criterion changed
  14. GRB000210 X-ray afterglow
  15. GRB000214: X-ray afterglow candidate
  16. BeppoSAX GRB000214 ("S. Valentine's day GRB")
  17. GRB 000210: BATSE Observations
  18. Optical observations of the Chandra X-ray source for GRB000210
  19. Chandra Observations of GRB000210 X-ray Afterglow
  20. IPN triangulation of GRB000210
  21. GRB 000201: TAROT optical observations
  22. GRB 000131 Optical Observations
  23. GRB000126 Optical Observations
  24. BATSE GRB trigger criteria changed
  25. GRB 991208, radio observations
  26. BATSE+IPN location of GRB000131
  27. IPN localization of GRB000131
  28. GRB 000126, optical observations
  29. GRB000126, optical observations
  30. BATSE location of GRB000126
  31. IPN localization of GRB000126
  32. GRB 000115 Optical observations
  33. BATSE Observations of GRB000115
  34. Second RXTE Observation of GRB 000115
  35. GRB991216, UBVRIJHK field photometry
  36. Single IPN error box for GRB991229
  37. GRB 991216 VLBA Observations
  38. BEPPOSAX GRBM Localization of GRB991226
  39. IPN error boxes for GRB991229
  40. GRB 991216: J band spectrophotometry
  41. GRB 991216: Detection of the Host and/or Absorber Galaxy
  42. IPN localization of GRB991226
  43. Single IPN error box for GRB991221
  44. IPN error boxes for GRB991221
  45. GRB 991216 RXTE ASM Observations
  46. IPN error box for GRB991216
  47. GRB 991216: Updated BATSE parameters
  48. Lowell/Perkins observation of GRB 991216
  49. GRB 991217 (SAX J2303.2+0015) Optical observations
  50. Chandra observation of the X-ray afterglow of GRB991216
  51. GRB 991216, optical observations
  52. GRB 991216 Optical Observations
  53. GRB 991216 Optical spectroscopy/imaging
  54. K observations of GRB991216
  55. GRB 991217 (SAX J2303.2+0015) Optical observations
  56. GRB991216 Spectroscopy
  57. Lowell/Perkins observation of GRB 991216
  58. GRB991216, optical observations
  59. Refined IPN localization of GRB991216
  60. GRB 991216 Radio Observations
  61. GRB 991217
  62. GRB 991208 Keck Spectroscopy
  63. GRB 991208 Infrared Detection
  64. GRB 991216--Summary of RXTE Observations
  65. GRB 991216 Optical Observations
  66. GRB 991216, optical observations
  67. GRB 991208 SAO-RAS Spectroscopy
  68. SAX J2303.2+0015: an x-ray/GRB?
  69. GRB 991216, Optical Transient
  70. GRB 991216, Optical Afterglow
  71. GRB 991216: Comparison with DPOSS images
  72. GRB 991208 optical observations
  73. Lowell/Perkins observation of GRB 991216
  74. GRB 991216 Optical Observation
  75. GRB 991208 Keck Spectroscopy
  76. GRB 991216: Extremely bright BATSE burst
  77. GRB991208, optical observations
  78. GRB 991208 Keck Spectroscopy
  79. GRB991208 - millimeter detection
  80. GRB 991208, Optical Observation
  81. GRB 991208 - OVRO detection
  82. GRB 991208 Optical Decay
  83. GRB 991208 optical observations
  84. GRB 991208 optical observations
  85. GRB 991208: Radio Observations
  86. IPN localization of GRB991208
  87. Optical Observations of GRB991105
  88. GRB991106: BeppoSAX/BATSE results
  89. GRB 991106, optical observations
  90. GRB991106, near-infrared observations
  91. BeppoSAX NFI Observation of GRB991106
  92. GRB 991106, radio observations
  93. GRB991106: the first BeppoSAX short GRB detection?
  94. GRB 991105: BATSE Observations
  95. IPN localization of GRB991105
  96. GRB 991106 Optical Observations
  97. GRB 991105, optical observations
  98. GRB991106, optical observation at SAO-RAS
  99. GRB 991106, LOTIS Optical Observations
  100. GRB 991106, optical observations

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