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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"

19615 results found.

  1. GRB 090929B: RAPTOR Discovery of Optical Counterpart
  2. GRB 090929A BAT location of the Fermi GBM burst
  3. Correction: GRB 090929B: Enhanced Swift-XRT position
  4. GRB 090929: Enhanced Swift-XRT position
  5. GRB 090929B: Swift detection of a burst
  6. GRB090926A: Swift-XRT refined analysis
  7. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  8. GRB 090926B: Fermi GBM detection
  9. GRB 090927: Zadko Telescope observations
  10. GRB 090927, Swift-BAT refined analysis of the possibly short burst
  11. Swift/UVOT observations of GRB 090927
  12. GRB 090927: Swift XRT refined analysis
  13. GRB 090927: Enhanced Swift-XRT position
  14. GRB090926B: Swift/UVOT Upper Limits
  15. GRB090926A: Swift/UVOT observations
  16. GRB 090927: Swift/UVOT detection of an optical afterglow
  17. GRB 090927: Swift detection of a short burst
  18. GRB 090926B: MAXI GSC detection
  19. GRB 090926B: Swift XRT refined analysis
  20. GRB 090926B: Swift-BAT refined analysis
  21. GRB 090926A: Swift/UVOT detection of an optical afterglow
  22. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  23. GRB090926A: UVOT-enhanced XRT position
  24. GRB 090926B: Swift detection of a burst
  25. GRB 090926: Fermi LAT detection
  26. GRB090904B : IRSF NIR upper limit
  27. Swift returns to normal operations
  28. GRB 090715B: Skynet/PROMPT Detections
  29. GRB 090916: Swift-XRT upper limit
  30. GRB 090807: Skynet/DSO Observations
  31. Swift-BAT temporarily off-line for a few days
  32. Short-Duration GRB 090916: Skynet/PROMPT Observations
  33. GRB 090912: optical observation
  34. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  35. GRB 090916, Swift-BAT refined analysis
  36. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  37. GRB 090916: Swift detection of a short burst
  38. GRB 090915 Swift-BAT detection of a burst in ground analysis
  39. GRB 090827: Confirmation of the X-ray afterglow
  40. GRB 090912: Swift-XRT refined analysis
  41. GRB 090912, Swift-BAT refined analysis
  42. GRB 090912: Swift/UVOT Upper Limits
  43. GRB 090912: Enhanced Swift-XRT position
  44. GRB 090912: Swift detection of a burst
  45. GRB 090814A: Skynet/DSO & GORT Observations
  46. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  47. GRB 090904B: GROND detection of the optical afterglow
  48. GRB 090904A: Swift/UVOT Refined Analysis
  49. GRB 090904B: Swift/UVOT Refined Analysis
  50. GRB 090904B: Fermi GBM detection
  51. GRB 090904A: Swift-XRT refined analysis
  52. GRB 090904B: Swift XRT Refined Analysis
  53. GRB 090904B: MOA-II Optical observation
  54. GRB 090904A: Enhanced Swift XRT position
  55. GRB 090904B: Swift-BAT refined analysis
  56. GRB 090904A: Swift-BAT refined analysis
  57. GRB 090904B: Enhanced Swift-XRT position
  58. GRB090904A: Correction to enhanced XRT position
  59. GRB 090904A: Enhanced Swift-XRT position
  60. GRB090904B: REM observations
  61. GRB 090904B: Swift detection of a burst
  62. GRB 090904A: ROTSE-III Optical Limits
  63. GRB 090904: Swift detection of a burst
  64. GRB 090902B: Swift/UVOT refined analysis
  65. GRB090902B: Swift XRT refined analysis
  66. GRB 090902B: Faulkes Telescope North observations
  67. GRB 090902B: GROND NIR Afterglow Observations
  68. GRB 090902B: Gemini-N absorption redshift
  69. GRB 090902B: Enhanced Swift-XRT position
  70. GRB 090902B: Optical afterglow candidate
  71. GRB090902B: Swift/UVOT observations
  72. GRB 090902B: Swift/XRT Afterglow Candidate
  73. GRB 090902B: Fermi LAT detection
  74. GRB 090831C BAT refined analysis
  75. GRB 090831C: GROND upper limits
  76. Swift Trigger 361477, called GRB090831B, is probably not real.
  77. GRB090831C: Swift/UVOT upper limits
  78. GRB 090831C: Swift XRT Refined Analysis
  79. GRB 090831C: Enhanced Swift-XRT position
  80. GRB 090831C: Swift detection of a burst
  81. GRB 090831B, RIMOTS optical upper limits
  82. GRB 090831B: Swift detection of a possible burst
  83. GRB 090827: Swift XRT and UVOT observations
  84. GRB 090827 Burst discovered in BAT ground analysis
  85. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  86. GRB 090823: Confirmation of Swift-BAT position by BAT Slew Survey
  87. GRB 090823 Correction to BAT position
  88. GRB 090817: No host galaxy, no supernova
  89. Konus-Wind observations of GRB 090823
  90. GRB 090823 Long burst with IPN triangulation and BAT position
  91. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  92. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  93. GRB 090817: Liverpool Telescope Observations
  94. GRB 090817: Confirmation of the X-ray afterglow
  95. GRB 090815C: Swift refined analysis
  96. GRB 090817: Swift/UVOT Upper Limits
  97. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  98. GRB 090817: Swift-XRT observations
  99. GRB 090813: Suzaku WAM observation of the prompt emission
  100. GRB 090812: Suzaku WAM observation of the prompt emission

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