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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"

19531 results found.

  1. GRB060211: Faulkes North observation
  2. GRB 060211: Swift detection of a long burst
  3. GRB 060210: Refined analysis of the Swift-BAT burst
  4. GRB060210: Swift XRT Refined Analysis
  5. GRB060210: Early Optical Observations
  6. GRB060210:Faulkes Telescope North Afterglow Confirmation
  7. GRB 060210: candidate afterglow
  8. GRB 060210: Swift detection of a burst
  9. GRB060210: Optical afterglow
  10. GRB 060206: Swift/UVOT Observations
  11. Swift-BAT trigger 180931 is not a GRB
  12. GRB060209: RTT150 optical observations
  13. GRB 060209 : TAROT optical observation
  14. GRB 060209(?): Swift-BAT detection of a possible burst
  15. GRB 060206: WSRT Radio Observations
  16. GRB 060203: Swift/UVOT upper limits
  17. GRB060204a: Swift XRT Source is not GRB Afterglow
  18. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  19. GRB 060204A: ROSAT Pointing
  20. GRB060204A: Swift/UVOT observations
  21. GRB 060206: Swift-BAT refined analysis
  22. GRB060206: Swift XRT Refined Analysis
  23. GRB060206: Swift XRT Position
  24. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  25. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  26. GRB060206: Swift-BAT detection of a burst
  27. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  28. BAT GRB 060204C is probably not a GRB
  29. GRB 060204B: BVRi-band detections of optical afterglow
  30. GRB 060204A: Swift XRT upper limit
  31. GRB060204B: Swift/UVOT refined analysis
  32. Swift XRT Observation of GRB 060204C
  33. GRB 060204B: Swift-BAT refined analysis
  34. GRB060204B: Swift XRT Team Refined Analysis
  35. GRB 060204C: OSN limits
  36. GRB 060204C: Liverpool Telescopes optical limit
  37. GRB 060204C: ROTSE-III Optical Limits
  38. GRB 060204C: Swift-BAT detection of a burst
  39. GRB 060124: Radio Observations
  40. GRB060204B: Faulkes OT candidate
  41. GRB060204B, optical observation
  42. GRB060204B - SDSS pre-burst observations
  43. GRB 060203: Swift-BAT refined analysis
  44. GRB 060204B: Swift detection of a burst
  45. GRB 060203: RTT150 optical observations
  46. GRB060203: Swift XRT Team Refined Analysis
  47. GRB060203 - Swift UVOT observation
  48. Swift-BAT trigger is GRB 060203
  49. GRB060203: Observations with SARA
  50. GRB 060203: P60 Confirmation of Optical Afterglow
  51. Possible GRB 060203: candidate optical counterpart
  52. Swift BAT Trigger 180151: Swift XRT source detection
  53. Possible GRB 060203: optical observations at Asiago
  54. Swift-BAT trigger 180151 is unknown origin at this time
  55. GRB 060202: Refined analysis of the Swift-BAT burst
  56. GRB060202, optical observation
  57. GRB 060202: Swift/UVOT upper limits
  58. GRB 060202: Swift XRT Team Refined Analysis
  59. GRB060202: Faulkes North observation
  60. GRB 060202: Swift detection of a burst
  61. GRB 060130: Swift/XRT observation
  62. GRB 060123: VLA Radio Observations
  63. Possible GRB 051221B: MDM Correction
  64. GRB 060123: Swift refined analysis of an unusual GRB
  65. GRB060124, BVRcIc field calibration
  66. GRB060105: refined analysis of the Suzaku observation
  67. GRB 060124: HETE detection and spectrum of the main peak
  68. Konus-Wind observation of GRB 060124
  69. GRB060124: detailed XRT analysis
  70. GRB 060124 Optical Observations
  71. GRB 060124: R band Observations
  72. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  73. GRB 060123: Swift detection of a very long, faint burst
  74. GRB 060124: TAROT optical limits
  75. GRB 060124: Swift/UVOT Observation
  76. GRB 060124: Confirmation of the Afterglow
  77. GRB 060124: XRT position
  78. GRB 060124: Optical Observations at Tautenburg
  79. GRB 060117: Suzaku WAM observation of the prompt emission
  80. GRB060124:MASTER optical observation
  81. GRB 060111B: Suzaku WAM observation of the prompt emission
  82. GRB 060124: Swift-BAT detection of a burst
  83. GRB 060116: Radio Detection
  84. GRB 060116: MARGE optical observations
  85. GRB 060121: Swift/UVOT upper limits
  86. GRB 060121: Liverpool Telescopes optical limits
  87. GRB 060121: Swift XRT refined analysis
  88. GRB 060121: Swift XRT refined position
  89. GRB 060117: pseudo-z from spectral parameters of the prompt emission
  90. Konus-Wind observation of GRB 060117
  91. GRB 060117: Refined analysis of the Swift-BAT burst
  92. GRB 060117: FRAM optical afterglow candidate
  93. GRB 060117: Swift-BAT detection of a bright burst
  94. GRB 060116: Refined analysis of the Swift-BAT burst
  95. GRB 060116: Swift/UVOT upper limits
  96. GRB060115: REM observations
  97. GRB 060110: XRT position and analysis
  98. GRB 060116: ROTSE-III Optical Limits
  99. GRB060116: XRT position
  100. GRB060116: Faulkes North observation

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