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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"

19610 results found.

  1. GRB 090929: Enhanced Swift-XRT position
  2. GRB 090929B: Swift detection of a burst
  3. GRB090926A: Swift-XRT refined analysis
  4. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  5. GRB 090926B: Fermi GBM detection
  6. GRB 090927: Zadko Telescope observations
  7. GRB 090927, Swift-BAT refined analysis of the possibly short burst
  8. Swift/UVOT observations of GRB 090927
  9. GRB 090927: Swift XRT refined analysis
  10. GRB 090927: Enhanced Swift-XRT position
  11. GRB090926B: Swift/UVOT Upper Limits
  12. GRB090926A: Swift/UVOT observations
  13. GRB 090927: Swift/UVOT detection of an optical afterglow
  14. GRB 090927: Swift detection of a short burst
  15. GRB 090926B: MAXI GSC detection
  16. GRB 090926B: Swift XRT refined analysis
  17. GRB 090926B: Swift-BAT refined analysis
  18. GRB 090926A: Swift/UVOT detection of an optical afterglow
  19. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  20. GRB090926A: UVOT-enhanced XRT position
  21. GRB 090926B: Swift detection of a burst
  22. GRB 090926: Fermi LAT detection
  23. GRB090904B : IRSF NIR upper limit
  24. Swift returns to normal operations
  25. GRB 090715B: Skynet/PROMPT Detections
  26. GRB 090916: Swift-XRT upper limit
  27. GRB 090807: Skynet/DSO Observations
  28. Swift-BAT temporarily off-line for a few days
  29. Short-Duration GRB 090916: Skynet/PROMPT Observations
  30. GRB 090912: optical observation
  31. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  32. GRB 090916, Swift-BAT refined analysis
  33. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  34. GRB 090916: Swift detection of a short burst
  35. GRB 090915 Swift-BAT detection of a burst in ground analysis
  36. GRB 090827: Confirmation of the X-ray afterglow
  37. GRB 090912: Swift-XRT refined analysis
  38. GRB 090912, Swift-BAT refined analysis
  39. GRB 090912: Swift/UVOT Upper Limits
  40. GRB 090912: Enhanced Swift-XRT position
  41. GRB 090912: Swift detection of a burst
  42. GRB 090814A: Skynet/DSO & GORT Observations
  43. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  44. GRB 090904B: GROND detection of the optical afterglow
  45. GRB 090904A: Swift/UVOT Refined Analysis
  46. GRB 090904B: Swift/UVOT Refined Analysis
  47. GRB 090904B: Fermi GBM detection
  48. GRB 090904A: Swift-XRT refined analysis
  49. GRB 090904B: Swift XRT Refined Analysis
  50. GRB 090904B: MOA-II Optical observation
  51. GRB 090904A: Enhanced Swift XRT position
  52. GRB 090904B: Swift-BAT refined analysis
  53. GRB 090904A: Swift-BAT refined analysis
  54. GRB 090904B: Enhanced Swift-XRT position
  55. GRB090904A: Correction to enhanced XRT position
  56. GRB 090904A: Enhanced Swift-XRT position
  57. GRB090904B: REM observations
  58. GRB 090904B: Swift detection of a burst
  59. GRB 090904A: ROTSE-III Optical Limits
  60. GRB 090904: Swift detection of a burst
  61. GRB 090902B: Swift/UVOT refined analysis
  62. GRB090902B: Swift XRT refined analysis
  63. GRB 090902B: Faulkes Telescope North observations
  64. GRB 090902B: GROND NIR Afterglow Observations
  65. GRB 090902B: Gemini-N absorption redshift
  66. GRB 090902B: Enhanced Swift-XRT position
  67. GRB 090902B: Optical afterglow candidate
  68. GRB090902B: Swift/UVOT observations
  69. GRB 090902B: Swift/XRT Afterglow Candidate
  70. GRB 090902B: Fermi LAT detection
  71. GRB 090831C BAT refined analysis
  72. GRB 090831C: GROND upper limits
  73. Swift Trigger 361477, called GRB090831B, is probably not real.
  74. GRB090831C: Swift/UVOT upper limits
  75. GRB 090831C: Swift XRT Refined Analysis
  76. GRB 090831C: Enhanced Swift-XRT position
  77. GRB 090831C: Swift detection of a burst
  78. GRB 090831B, RIMOTS optical upper limits
  79. GRB 090831B: Swift detection of a possible burst
  80. GRB 090827: Swift XRT and UVOT observations
  81. GRB 090827 Burst discovered in BAT ground analysis
  82. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  83. GRB 090823: Confirmation of Swift-BAT position by BAT Slew Survey
  84. GRB 090823 Correction to BAT position
  85. GRB 090817: No host galaxy, no supernova
  86. Konus-Wind observations of GRB 090823
  87. GRB 090823 Long burst with IPN triangulation and BAT position
  88. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  89. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  90. GRB 090817: Liverpool Telescope Observations
  91. GRB 090817: Confirmation of the X-ray afterglow
  92. GRB 090815C: Swift refined analysis
  93. GRB 090817: Swift/UVOT Upper Limits
  94. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  95. GRB 090817: Swift-XRT observations
  96. GRB 090813: Suzaku WAM observation of the prompt emission
  97. GRB 090812: Suzaku WAM observation of the prompt emission
  98. GRB 090813: CrAO optical obsevations
  99. GRB 090814B: Confirmation of the X-ray afterglow
  100. GRB 090814B: I-band observations from 1.23m CAHA telescope

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