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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"

24408 results found.

  1. GRB 060211B: Swift/BAT refined analysis
  2. GRB 060211B: Swift-XRT Team refined analysis
  3. GRB060211.7: MASTER_optical_observation under the snow
  4. GRB 060211A: Swift XRT Team Refined Analysis
  5. GRB060211: Faulkes North observation
  6. GRB 060211: ROTSE-III Optical Limits
  7. GRB 060211: Swift detection of a long burst
  8. GRB 060210: Refined analysis of the Swift-BAT burst
  9. GRB060210: Swift XRT Refined Analysis
  10. GRB060206, optical observations
  11. GRB 060210 : Xinglong and Lulin optical limit
  12. GRB060210: Optical Observations
  13. GRB060210:Faulkes Telescope North Afterglow Confirmation
  14. GRB060210: Optical afterglow
  15. GRB060209A: MASTER optical observation
  16. GRB 060206: TTT Observations
  17. GRB 060206: More PROMPT Detections
  18. GRB 060206: Tenagra II Observations
  19. GRB 060206: PROMPT Detections
  20. Retraction of orphan GRB afterglow candidate
  21. GRB 060206: optical observations at Asiago
  22. Orphan GRB Afterglow candidate
  23. GRB 060206: Subaru/FOCAS optical spectroscopy
  24. GRB 060206: Swift-BAT refined analysis
  25. GRB 060206 : Lulin optical observations
  26. GRB060206: Liverpool Telescope observation
  27. GRB 060206: RAPTOR observations of afterglow candidate variability.
  28. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  29. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  30. GRB060203: WHT Z-band observations
  31. BAT GRB 060204C is probably not a GRB
  32. GRB 060204C: optical observations
  33. GRB 060204B: Swift-BAT refined analysis
  34. GRB060204B: Swift XRT Team Refined Analysis
  35. GRB 060204C: BOOTES-IR optical limits
  36. GRB 060204C: ROTSE-III Optical Limits
  37. GRB 060204C: Swift-BAT detection of a burst
  38. GRB060204B: Faulkes OT candidate
  39. GRB 060204A: further INTEGRAL results
  40. GRB060204B, optical observation
  41. GRB 060203: Swift-BAT refined analysis
  42. GRB 060204: a long GRB detected by INTEGRAL
  43. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  44. GRB060203: Observations with SARA
  45. Swift BAT Trigger 180151: Swift XRT source detection
  46. Possible GRB 060203: optical observations at Asiago
  47. GRB 060202: PROMPT Observations
  48. Swift-BAT trigger 180151 is unknown origin at this time
  49. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  50. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  51. GRB 060202: Refined analysis of the Swift-BAT burst
  52. GRB060202, optical observation
  53. GRB 060202: Swift XRT Team Refined Analysis
  54. GRB 060202 : Lulin R and I band limit
  55. GRB060202: Faulkes North observation
  56. GRB 060121: Gemini Late-time Observations
  57. GRB 060130: PROMPT Observations
  58. GRB 060123: Gemini spectroscopy of the putative host galaxy
  59. GRB060130: REM infrared observations
  60. GRB 060130: further INTEGRAL IBIS results
  61. GRB 060130: a long GRB detected with INTEGRAL
  62. GRB050121: optical observation
  63. GRB050121b: optical observation
  64. GRB 060123: Swift refined analysis of an unusual GRB
  65. GRB060124 optical observations
  66. GRB 060124: HETE detection and spectrum of the main peak
  67. Konus-Wind observation of GRB 060124
  68. GRB060123: Optical and IR Imaging
  69. GRB 060124: Keck optical spectrum
  70. GRB 060124: XRT refined analysis
  71. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  72. GRB 060117: Suzaku WAM observation of the prompt emission
  73. GRB060124:MASTER optical observation
  74. GRB 060111B: Suzaku WAM observation of the prompt emission
  75. GRB 060124: Swift-BAT detection of a burst
  76. GRB 060121: Swift XRT refined analysis
  77. Konus-Wind observation of GRB 060121
  78. GRB 060121: I-band Limits
  79. GRB060121: SARA Observations
  80. GRB 060121: optical observations
  81. HETE Alert 4006: MASTER promt optical limit
  82. GRB 060116: photometric redshift - the farthest GRB?
  83. Correction to GCN 4542 on GRB 060117
  84. Konus-Wind observation of GRB 060117
  85. GRB060108: photometric redshift determination
  86. GRB 060117: Refined analysis of the Swift-BAT burst
  87. GRB 060116: PROMPT Observations
  88. GRB 060116: Refined analysis of the Swift-BAT burst
  89. GRB 060115: PROMPT Observations
  90. GRB 060116: IR Candidate Afterglow
  91. GRB 060116: Swift/UVOT upper limits
  92. GRB060115: REM observations
  93. GRB 060110: XRT position and analysis
  94. GRB 060116 : Lulin optical limit
  95. GRB 060116: ROTSE-III Optical Limits
  96. GRB060116: Faulkes North observation
  97. GRB 060115: Refined analysis of the Swift-BAT burst
  98. GRB 060114: REM observations
  99. GRB 060114: Swift/UVOT Observations
  100. GRB 060115: Swift detection of a burst

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