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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"

32722 results found.

  1. GRB 060211b: P60 Observations
  2. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  3. GRB 060206: SOAR Detections
  4. GRB 050826: Optical Afterglow and Host Galaxy
  5. GRB 060210: Further refined analysis of the Swift-BAT burst
  6. GRB 060211B: Swift/BAT refined analysis
  7. GRB060210: Swift/UVOT Upper Limits
  8. GRB 060211B: Swift-XRT Team refined analysis
  9. GRB060211b: optical observation
  10. GRB060211B: Swift/XRT position
  11. GRB 060210: Optical Observations
  12. GRB 060211A: Swift XRT Team Refined Analysis
  13. GRB060211: Faulkes North observation
  14. GRB 060211: ROTSE-III Optical Limits
  15. GRB 060210: Refined analysis of the Swift-BAT burst
  16. GRB060210: Swift XRT Refined Analysis
  17. GRB060206, optical observations
  18. GRB060210: Optical Observations
  19. GRB060210: Gemini absorption spectroscopy
  20. GRB060210: Early Optical Observations
  21. GRB060210:Faulkes Telescope North Afterglow Confirmation
  22. GRB 060206: Swift/UVOT Observations
  23. GRB060209: RTT150 optical observations
  24. GRB 060209 : TAROT optical observation
  25. GRB 060206: near-infrared observations (JK' imaging)
  26. GRB 060206: WSRT Radio Observations
  27. GRB 060203: Swift/UVOT upper limits
  28. GRB 060206: TTT Observations
  29. GRB 060206: More PROMPT Detections
  30. GRB 060121 : WIDGET Pre-trigger limit
  31. GRB 060206: Tenagra II Observations
  32. GRB 060206: PROMPT Detections
  33. GRB060204a: Swift XRT Source is not GRB Afterglow
  34. GRB 060206: optical observations at Asiago
  35. Orphan GRB Afterglow candidate
  36. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  37. GRB 060206: Subaru/FOCAS optical spectroscopy
  38. GRB 060206: IR Detection of the Afterglow
  39. GRB 060206: Lick 3m Spectroscopy
  40. GRB 060204A: ROSAT Pointing
  41. GRB 060206: Super-LOTIS observations
  42. GRB060204A: Swift/UVOT observations
  43. GRB 060206: Swift-BAT refined analysis
  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. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  58. GRB060203: WHT Z-band observations
  59. BAT GRB 060204C is probably not a GRB
  60. GRB060204C: optical observation
  61. GRB 060204B: BVRi-band detections of optical afterglow
  62. GRB 060204A: Swift XRT upper limit
  63. GRB 060204A: FRAM optical observations
  64. GRB060204B: Swift/UVOT refined analysis
  65. GRB 060204C: optical observations
  66. Swift XRT Observation of GRB 060204C
  67. GRB 060204B: Swift-BAT refined analysis
  68. GRB 060204B: ART early limit
  69. GRB060204B: Swift XRT Team Refined Analysis
  70. GRB 060204C: OSN limits
  71. GRB 060204b: Keck/LRIS Afterglow Confirmation
  72. GRB 060204C: BOOTES-IR optical limits
  73. GRB 060204C: Liverpool Telescopes optical limit
  74. GRB 060204C: ROTSE-III Optical Limits
  75. GRB 060124: Radio Observations
  76. GRB060204B: Faulkes OT candidate
  77. GRB 060204B: ART optical limit
  78. GRB 060204A: further INTEGRAL results
  79. GRB060204B, optical observation
  80. GRB 060203: Swift-BAT refined analysis
  81. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  82. GRB 060203: RTT150 optical observations
  83. GRB060203 - Swift UVOT observation
  84. Swift-BAT trigger is GRB 060203
  85. GRB 060203: IR Counterpart
  86. GRB060203: Observations with SARA
  87. GRB 060203: P60 Confirmation of Optical Afterglow
  88. Possible GRB 060203: candidate optical counterpart
  89. Swift BAT Trigger 180151: Swift XRT source detection
  90. Possible GRB 060203: optical observations at Asiago
  91. GRB 060202: PROMPT Observations
  92. GRB 060202: GETS observation
  93. GRB 060202: Gemini-N J, H, K_s observations
  94. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  95. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  96. GRB 060202: Refined analysis of the Swift-BAT burst
  97. GRB060202, optical observation
  98. GRB 060202: Swift/UVOT upper limits
  99. GRB 060202: Swift XRT Team Refined Analysis
  100. GRB 060202 : Lulin R and I band limit

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