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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"

23711 results found.

  1. GRB 060206: SOAR Detections
  2. GRB 050826: Optical Afterglow and Host Galaxy
  3. GRB 060210: Further refined analysis of the Swift-BAT burst
  4. GRB 060211B: Swift/BAT refined analysis
  5. GRB 060211B: Swift-XRT Team refined analysis
  6. GRB060211.7: MASTER_optical_observation under the snow
  7. GRB 060211A: Swift XRT Team Refined Analysis
  8. GRB060211: Faulkes North observation
  9. GRB 060211: ROTSE-III Optical Limits
  10. GRB 060211: Swift detection of a long burst
  11. GRB 060210: Refined analysis of the Swift-BAT burst
  12. GRB060210: Swift XRT Refined Analysis
  13. GRB060206, optical observations
  14. GRB 060210 : Xinglong and Lulin optical limit
  15. GRB060210: Optical Observations
  16. GRB060210:Faulkes Telescope North Afterglow Confirmation
  17. GRB060210: Optical afterglow
  18. GRB060209A: MASTER optical observation
  19. GRB 060206: TTT Observations
  20. GRB 060206: More PROMPT Detections
  21. GRB 060206: Tenagra II Observations
  22. GRB 060206: PROMPT Detections
  23. Retraction of orphan GRB afterglow candidate
  24. GRB 060206: optical observations at Asiago
  25. Orphan GRB Afterglow candidate
  26. GRB 060206: Subaru/FOCAS optical spectroscopy
  27. GRB 060206: Swift-BAT refined analysis
  28. GRB 060206 : Lulin optical observations
  29. GRB060206: Liverpool Telescope observation
  30. GRB 060206: RAPTOR observations of afterglow candidate variability.
  31. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  32. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  33. GRB060203: WHT Z-band observations
  34. BAT GRB 060204C is probably not a GRB
  35. GRB 060204C: optical observations
  36. GRB 060204B: Swift-BAT refined analysis
  37. GRB060204B: Swift XRT Team Refined Analysis
  38. GRB 060204C: BOOTES-IR optical limits
  39. GRB 060204C: ROTSE-III Optical Limits
  40. GRB 060204C: Swift-BAT detection of a burst
  41. GRB060204B: Faulkes OT candidate
  42. GRB 060204A: further INTEGRAL results
  43. GRB060204B, optical observation
  44. GRB 060203: Swift-BAT refined analysis
  45. GRB 060204: a long GRB detected by INTEGRAL
  46. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  47. GRB060203: Observations with SARA
  48. Swift BAT Trigger 180151: Swift XRT source detection
  49. Possible GRB 060203: optical observations at Asiago
  50. GRB 060202: PROMPT Observations
  51. Swift-BAT trigger 180151 is unknown origin at this time
  52. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  53. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  54. GRB 060202: Refined analysis of the Swift-BAT burst
  55. GRB060202, optical observation
  56. GRB 060202: Swift XRT Team Refined Analysis
  57. GRB 060202 : Lulin R and I band limit
  58. GRB060202: Faulkes North observation
  59. GRB 060121: Gemini Late-time Observations
  60. GRB 060130: PROMPT Observations
  61. GRB 060123: Gemini spectroscopy of the putative host galaxy
  62. GRB060130: REM infrared observations
  63. GRB 060130: further INTEGRAL IBIS results
  64. GRB 060130: a long GRB detected with INTEGRAL
  65. GRB050121: optical observation
  66. GRB050121b: optical observation
  67. GRB 060123: Swift refined analysis of an unusual GRB
  68. GRB060124 optical observations
  69. GRB 060124: HETE detection and spectrum of the main peak
  70. Konus-Wind observation of GRB 060124
  71. GRB060123: Optical and IR Imaging
  72. GRB 060124: Keck optical spectrum
  73. GRB 060124: XRT refined analysis
  74. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  75. GRB 060117: Suzaku WAM observation of the prompt emission
  76. GRB060124:MASTER optical observation
  77. GRB 060111B: Suzaku WAM observation of the prompt emission
  78. GRB 060124: Swift-BAT detection of a burst
  79. GRB 060121: Swift XRT refined analysis
  80. Konus-Wind observation of GRB 060121
  81. GRB 060121: I-band Limits
  82. GRB060121: SARA Observations
  83. GRB 060121: optical observations
  84. HETE Alert 4006: MASTER promt optical limit
  85. GRB 060116: photometric redshift - the farthest GRB?
  86. Correction to GCN 4542 on GRB 060117
  87. Konus-Wind observation of GRB 060117
  88. GRB060108: photometric redshift determination
  89. GRB 060117: Refined analysis of the Swift-BAT burst
  90. GRB 060116: PROMPT Observations
  91. GRB 060116: Refined analysis of the Swift-BAT burst
  92. GRB 060115: PROMPT Observations
  93. GRB 060116: IR Candidate Afterglow
  94. GRB 060116: Swift/UVOT upper limits
  95. GRB060115: REM observations
  96. GRB 060110: XRT position and analysis
  97. GRB 060116 : Lulin optical limit
  98. GRB 060116: ROTSE-III Optical Limits
  99. GRB060116: Faulkes North observation
  100. GRB 060115: Refined analysis of the Swift-BAT burst

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