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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"

26265 results found.

  1. GRB060210: Optical afterglow
  2. GRB 060206: Swift/UVOT Observations
  3. Swift-BAT trigger 180931 is not a GRB
  4. GRB060209: RTT150 optical observations
  5. GRB 060209 : TAROT optical observation
  6. GRB 060209(?): Swift-BAT detection of a possible burst
  7. GRB 060203: Swift/UVOT upper limits
  8. GRB 060121 : WIDGET Pre-trigger limit
  9. GRB 060206: IR Detection of the Afterglow
  10. GRB060204A: Swift/UVOT observations
  11. GRB 060206: Swift-BAT refined analysis
  12. GRB060206: SDSS Pre-Burst Observations
  13. GRB060206: Swift XRT Refined Analysis
  14. GRB060206: Liverpool Telescope observation
  15. GRB060206: P60 Optical Observations
  16. GRB060206: SARA Detection
  17. GRB 060206: RAPTOR observations of afterglow candidate variability.
  18. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  19. GRB060206: Swift-BAT detection of a burst
  20. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  21. BAT GRB 060204C is probably not a GRB
  22. GRB 060204B: BVRi-band detections of optical afterglow
  23. GRB060204B: Swift/UVOT refined analysis
  24. Swift XRT Observation of GRB 060204C
  25. GRB 060204B: Swift-BAT refined analysis
  26. GRB 060204B: ART early limit
  27. GRB 060204C: Liverpool Telescopes optical limit
  28. GRB 060204C: ROTSE-III Optical Limits
  29. GRB 060204C: Swift-BAT detection of a burst
  30. GRB060204B: Faulkes OT candidate
  31. GRB060204B, optical observation
  32. GRB060204B - SDSS pre-burst observations
  33. GRB 060203: Swift-BAT refined analysis
  34. GRB 060204B: Swift detection of a burst
  35. GRB 060203: RTT150 optical observations
  36. GRB060203: Swift XRT Team Refined Analysis
  37. GRB060203 - Swift UVOT observation
  38. Swift-BAT trigger is GRB 060203
  39. Possible GRB 060203: candidate optical counterpart
  40. Swift BAT Trigger 180151: Swift XRT source detection
  41. Possible GRB 060203: optical observations at Asiago
  42. Swift-BAT trigger 180151 is unknown origin at this time
  43. GRB 060202: GETS observation
  44. GRB 060202: Refined analysis of the Swift-BAT burst
  45. GRB060202, optical observation
  46. GRB 060202: Swift/UVOT upper limits
  47. GRB 060202: Swift XRT Team Refined Analysis
  48. GRB060202: Faulkes North observation
  49. GRB 060202: Swift detection of a burst
  50. GRB060130: Optical imaging
  51. GRB 060124: HETE detection and spectrum of the main peak
  52. Konus-Wind observation of GRB 060124
  53. GRB060124: detailed XRT analysis
  54. GRB 060124 Optical Observations
  55. GRB 060124: ART optical limits during the burst
  56. GRB 060124: R band Observations
  57. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  58. GRB060123: SDSS pre-burst observations
  59. GRB 060123: Swift detection of a very long, faint burst
  60. GRB 060121: OHP optical limits
  61. GRB 060124: TAROT optical limits
  62. GRB 060124: Swift/UVOT Observation
  63. GRB 060124: XRT position
  64. GRB 060117: Suzaku WAM observation of the prompt emission
  65. GRB 060111B: Suzaku WAM observation of the prompt emission
  66. GRB 060124: Swift-BAT detection of a burst
  67. GRB 060116: Radio Detection
  68. GRB 060116: MARGE optical observations
  69. GRB 060121: Swift XRT refined analysis
  70. GRB 060121: Swift XRT refined position
  71. GRB060121 - SDSS pre-burst observations
  72. Konus-Wind observation of GRB 060117
  73. GRB 060117: Refined analysis of the Swift-BAT burst
  74. GRB 060117: FRAM optical afterglow candidate
  75. GRB 060117: Swift-BAT detection of a bright burst
  76. GRB 060116: Refined analysis of the Swift-BAT burst
  77. GRB 060116: Swift/UVOT upper limits
  78. GRB 060110: XRT position and analysis
  79. GRB 060116: ROTSE-III Optical Limits
  80. GRB060116: XRT position
  81. GRB060116: Faulkes North observation
  82. GRB 060116: Swift-BAT detection of a burst
  83. GRB 060115: Refined analysis of the Swift-BAT burst
  84. GRB 060115: Swift/UVOT upper limits
  85. GRB 060115: Swift XRT refined analysis
  86. GRB 060114: Swift/UVOT Observations
  87. GRB 060115: Swift detection of a burst
  88. GRB 060114: Swift XRT upper limit
  89. GRB060114: Faulkes North observation
  90. GRB 060110: KAIT observations
  91. GRB 060111B: Swift XRT refined analysis
  92. GRB 060111B: TAROT optical observation
  93. GRB060111A: RTT150 optical observations
  94. GRB060111B: RTT150, possible host galaxy
  95. GRB 060111B: Refined analysis of the Swift-BAT burst
  96. GRB 060110: MARGE observations
  97. GRB 060111(a): P60 Observations
  98. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  99. GRB 060111B: Swift detection of a burst
  100. GRB 060111: Swift-BAT Refined Analysis

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