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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"
  1. GRB 060211B: Swift-BAT detection of a burst
  2. GRB060211: Faulkes North observation
  3. GRB 060211: ROTSE-III Optical Limits
  4. GRB 060211: Swift detection of a long burst
  5. GRB 060210: Refined analysis of the Swift-BAT burst
  6. GRB060210: Swift XRT Refined Analysis
  7. GRB060206, optical observations
  8. GRB 060210 : Xinglong and Lulin optical limit
  9. GRB060210: Optical Observations
  10. GRB060210: Gemini absorption spectroscopy
  11. GRB060210: Early Optical Observations
  12. GRB 060210: optical evolution
  13. GRB060210:Faulkes Telescope North Afterglow Confirmation
  14. GRB 060210: candidate afterglow
  15. GRB 060210: Swift detection of a burst
  16. GRB060210: Optical afterglow
  17. GRB 060206: Swift/UVOT Observations
  18. Swift-BAT trigger 180931 is not a GRB
  19. GRB060209: RTT150 optical observations
  20. GRB 060209 : TAROT optical observation
  21. GRB060209A: MASTER optical observation
  22. GRB 060209(?): Swift-BAT detection of a possible burst
  23. GRB 060206: near-infrared observations (JK' imaging)
  24. GRB 060206: WSRT Radio Observations
  25. GRB 060203: Swift/UVOT upper limits
  26. GRB 060206: TTT Observations
  27. GRB 060206: More PROMPT Detections
  28. GRB 060121 : WIDGET Pre-trigger limit
  29. GRB 060206: Tenagra II Observations
  30. GRB 060206: PROMPT Detections
  31. Retraction of orphan GRB afterglow candidate
  32. GRB060204a: Swift XRT Source is not GRB Afterglow
  33. GRB 060206: optical observations at Asiago
  34. Orphan GRB Afterglow candidate
  35. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  36. GRB 060206: Subaru/FOCAS optical spectroscopy
  37. GRB 060206: IR Detection of the Afterglow
  38. GRB 060206: Lick 3m Spectroscopy
  39. GRB 060204A: ROSAT Pointing
  40. GRB 060206: Super-LOTIS observations
  41. GRB060204A: Swift/UVOT observations
  42. GRB 060206: Swift-BAT refined analysis
  43. GRB 060206 : Lulin optical observations
  44. GRB060206: SDSS Pre-Burst Observations
  45. GRB060206: Swift XRT Refined Analysis
  46. GRB060206: Liverpool Telescope observation
  47. GRB 060206: Spectroscopic Redshift
  48. GRB060206: P60 Optical Observations
  49. GRB 060206: KAIT observations
  50. GRB060206: Swift XRT Position
  51. GRB060206: SARA Detection
  52. GRB 060206: RAPTOR observations of afterglow candidate variability.
  53. GRB 060206: High redshift burst
  54. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  55. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  56. GRB060206: Optical afterglow
  57. GRB060206: Swift-BAT detection of a burst
  58. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  59. GRB060203: WHT Z-band observations
  60. BAT GRB 060204C is probably not a GRB
  61. GRB060204C: optical observation
  62. GRB 060204B: BVRi-band detections of optical afterglow
  63. GRB 060204A: Swift XRT upper limit
  64. GRB 060204A: FRAM optical observations
  65. GRB060204B: Swift/UVOT refined analysis
  66. GRB 060204C: optical observations
  67. Swift XRT Observation of GRB 060204C
  68. GRB 060204B: Swift-BAT refined analysis
  69. GRB 060204B: ART early limit
  70. GRB060204B: Swift XRT Team Refined Analysis
  71. GRB 060204C: OSN limits
  72. GRB 060204b: Keck/LRIS Afterglow Confirmation
  73. GRB 060204C: BOOTES-IR optical limits
  74. GRB 060204C: Liverpool Telescopes optical limit
  75. GRB 060204C: ROTSE-III Optical Limits
  76. GRB 060204C: Swift-BAT detection of a burst
  77. GRB 060124: Radio Observations
  78. GRB060204B: Faulkes OT candidate
  79. GRB 060204B: ART optical limit
  80. GRB 060204A: further INTEGRAL results
  81. GRB060204B, optical observation
  82. GRB060204B - SDSS pre-burst observations
  83. GRB 060203: Swift-BAT refined analysis
  84. GRB 060204B: Swift detection of a burst
  85. GRB 060204: a long GRB detected by INTEGRAL
  86. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  87. GRB 060203: RTT150 optical observations
  88. GRB060203: Swift XRT Team Refined Analysis
  89. GRB060203 - Swift UVOT observation
  90. Swift-BAT trigger is GRB 060203
  91. GRB 060203: IR Counterpart
  92. GRB060203: Observations with SARA
  93. GRB 060203: P60 Confirmation of Optical Afterglow
  94. Possible GRB 060203: candidate optical counterpart
  95. Swift BAT Trigger 180151: Swift XRT source detection
  96. Possible GRB 060203: optical observations at Asiago
  97. GRB 060202: PROMPT Observations
  98. Swift-BAT trigger 180151 is unknown origin at this time
  99. GRB 060202: GETS observation
  100. GRB 060202: Gemini-N J, H, K_s observations

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