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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

27825 results found.

  1. GRB 090929B: Suzaku WAM observation of the prompt emission
  2. GRB 091003: Swift-XRT confirmation of fading afterglow
  3. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  4. GRB 091003: UVOT-enhanced XRT position
  5. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  6. GRB 091003: Swift XRT analysis
  7. GRB 091003A: Fermi LAT detection
  8. GRB 091003A: Fermi GBM detection
  9. GRB 090929A: Swift/UVOT Observations
  10. GRB 090929A, Swift-BAT refined analysis
  11. GRB 090929B, Swift-BAT refined analysis
  12. Trigger 371210: Swift/BAT Triggered on IGR J17511-3057
  13. GRB 090929A: Swift-XRT non-detection
  14. Konus-Wind observation of GRB 090929A
  15. Konus-Wind observation of GRB 090929B
  16. GRB 090927: Fermi GBM observation
  17. GRB 090929B: Swift-XRT refined analysis
  18. GRB 090929B: Skynet/DSO Observations
  19. GRB 090929B: Swift/UVOT Observations
  20. Konus-RF observation of GRB 090929A
  21. GRB 090929B: RAPTOR Discovery of Optical Counterpart
  22. GRB 090929A BAT location of the Fermi GBM burst
  23. Correction: GRB 090929B: Enhanced Swift-XRT position
  24. GRB 090929: Enhanced Swift-XRT position
  25. GRB 090929B: Swift detection of a burst
  26. GRB 090929A: Fermi GBM detection
  27. GRB090926A: Swift-XRT refined analysis
  28. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  29. GRB 090926B: Fermi GBM detection
  30. GRB 090927: Zadko Telescope observations
  31. GRB 090927, Swift-BAT refined analysis of the possibly short burst
  32. Swift/UVOT observations of GRB 090927
  33. GRB 090927: Swift XRT refined analysis
  34. GRB 090927: Enhanced Swift-XRT position
  35. GRB090926B: Swift/UVOT Upper Limits
  36. GRB090926A: Swift/UVOT observations
  37. GRB 090927: Swift/UVOT detection of an optical afterglow
  38. GRB 090927: Swift detection of a short burst
  39. GRB 090926B: MAXI GSC detection
  40. GRB 090926B: Swift XRT refined analysis
  41. GRB 090926B: Swift-BAT refined analysis
  42. GRB 090926A: Swift/UVOT detection of an optical afterglow
  43. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  44. GRB090926A: UVOT-enhanced XRT position
  45. GRB 090926B: Swift detection of a burst
  46. GRB 090926: Fermi LAT detection
  47. GRB 090926: Fermi GBM detection
  48. GRB 090925: Fermi GBM detection
  49. GRB090904B : IRSF NIR upper limit
  50. GRB 090922A: Fermi GBM detection
  51. Swift returns to normal operations
  52. GRB 090715B: Skynet/PROMPT Detections
  53. GRB 090916: Swift-XRT upper limit
  54. GRB 090807: Skynet/DSO Observations
  55. GRB 090915: GROND upper limits
  56. Swift-BAT temporarily off-line for a few days
  57. Short-Duration GRB 090916: Skynet/PROMPT Observations
  58. GRB 090915: SARA detection of afterglow candidate
  59. GRB 090912: optical observation
  60. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  61. GRB 090916, Swift-BAT refined analysis
  62. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  63. GRB 090916: Swift detection of a short burst
  64. GRB 090915 Swift-BAT detection of a burst in ground analysis
  65. GRB 090827: Confirmation of the X-ray afterglow
  66. GRB 090912: Swift-XRT refined analysis
  67. GRB 090912, Swift-BAT refined analysis
  68. GRB 090912: Swift/UVOT Upper Limits
  69. GRB 090912: Enhanced Swift-XRT position
  70. GRB 090912: Swift detection of a burst
  71. GRB 090910: Fermi GBM detection
  72. GRB 090814A: Skynet/DSO & GORT Observations
  73. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  74. GRB 090904B: GROND detection of the optical afterglow
  75. GRB 090904A: Swift/UVOT Refined Analysis
  76. GRB 090904B: Swift/UVOT Refined Analysis
  77. GRB 090904B: Fermi GBM detection
  78. GRB 090904A: Swift-XRT refined analysis
  79. GRB 090904B: Swift XRT Refined Analysis
  80. GRB 090904B: MOA-II Optical observation
  81. GRB 090904A: Enhanced Swift XRT position
  82. GRB 090904B: Swift-BAT refined analysis
  83. GRB 090902B: VLA radio detection
  84. GRB 090904A: Swift-BAT refined analysis
  85. GRB 090904B: Enhanced Swift-XRT position
  86. GRB090904A: Correction to enhanced XRT position
  87. GRB 090904A: Enhanced Swift-XRT position
  88. GRB090904B: REM observations
  89. GRB 090904B: Swift detection of a burst
  90. GRB 090904A: ROTSE-III Optical Limits
  91. GRB 090904: Swift detection of a burst
  92. GRB 090902B: ROTSE-III Detection of Optical Afterglow
  93. GRB 090902B: Swift/UVOT refined analysis
  94. GRB090902B: Swift XRT refined analysis
  95. GRB 090902B: Faulkes Telescope North observations
  96. GRB 090902B: GROND NIR Afterglow Observations
  97. GRB 090902B: Gemini-N absorption redshift
  98. GRB 090902B: Enhanced Swift-XRT position
  99. GRB 090902B: Optical afterglow candidate
  100. GRB090902B: Swift/UVOT observations

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