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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"

45674 results found.

  1. GRB060211b: optical observation
  2. GRB060211B: Swift/XRT position
  3. GRB 060210: Optical Observations
  4. GRB 060211A: Swift XRT Team Refined Analysis
  5. GRB 060211B: Swift-BAT detection of a burst
  6. GRB060211: Faulkes North observation
  7. GRB 060211: ROTSE-III Optical Limits
  8. GRB 060211: Swift detection of a long burst
  9. GRB 060210: Refined analysis of the Swift-BAT burst
  10. GRB060210: Swift XRT Refined Analysis
  11. GRB060206, optical observations
  12. GRB 060210 : Xinglong and Lulin optical limit
  13. GRB060210: Optical Observations
  14. GRB060210: Gemini absorption spectroscopy
  15. GRB060210: Early Optical Observations
  16. GRB 060210: optical evolution
  17. GRB060210:Faulkes Telescope North Afterglow Confirmation
  18. GRB 060210: candidate afterglow
  19. GRB 060210: Swift detection of a burst
  20. GRB060210: Optical afterglow
  21. GRB 060206: Swift/UVOT Observations
  22. Swift-BAT trigger 180931 is not a GRB
  23. GRB060209: RTT150 optical observations
  24. GRB 060209 : TAROT optical observation
  25. GRB 060209(?): Swift-BAT detection of a possible burst
  26. GRB 060206: near-infrared observations (JK' imaging)
  27. GRB 060206: WSRT Radio Observations
  28. GRB 060203: Swift/UVOT upper limits
  29. GRB 060206: TTT Observations
  30. GRB 060206: More PROMPT Detections
  31. GRB 060121 : WIDGET Pre-trigger limit
  32. GRB 060206: Tenagra II Observations
  33. GRB 060206: PROMPT Detections
  34. Retraction of orphan GRB afterglow candidate
  35. GRB060204a: Swift XRT Source is not GRB Afterglow
  36. GRB 060206: optical observations at Asiago
  37. Orphan GRB Afterglow candidate
  38. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  39. GRB 060206: Subaru/FOCAS optical spectroscopy
  40. GRB 060206: IR Detection of the Afterglow
  41. GRB 060206: Lick 3m Spectroscopy
  42. GRB 060204A: ROSAT Pointing
  43. GRB 060206: Super-LOTIS observations
  44. GRB060204A: Swift/UVOT observations
  45. GRB 060206: Swift-BAT refined analysis
  46. GRB 060206 : Lulin optical observations
  47. GRB060206: SDSS Pre-Burst Observations
  48. GRB060206: Swift XRT Refined Analysis
  49. GRB060206: Liverpool Telescope observation
  50. GRB 060206: Spectroscopic Redshift
  51. GRB060206: P60 Optical Observations
  52. GRB 060206: KAIT observations
  53. GRB060206: Swift XRT Position
  54. GRB060206: SARA Detection
  55. GRB 060206: RAPTOR observations of afterglow candidate variability.
  56. GRB 060206: High redshift burst
  57. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  58. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  59. GRB060206: Optical afterglow
  60. GRB060206: Swift-BAT detection of a burst
  61. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  62. GRB060203: WHT Z-band observations
  63. BAT GRB 060204C is probably not a GRB
  64. GRB060204C: optical observation
  65. GRB 060204B: BVRi-band detections of optical afterglow
  66. GRB 060204A: Swift XRT upper limit
  67. GRB 060204A: FRAM optical observations
  68. GRB060204B: Swift/UVOT refined analysis
  69. GRB 060204C: optical observations
  70. Swift XRT Observation of GRB 060204C
  71. GRB 060204B: Swift-BAT refined analysis
  72. GRB 060204B: ART early limit
  73. GRB060204B: Swift XRT Team Refined Analysis
  74. GRB 060204C: OSN limits
  75. GRB 060204b: Keck/LRIS Afterglow Confirmation
  76. GRB 060204C: BOOTES-IR optical limits
  77. GRB 060204C: Liverpool Telescopes optical limit
  78. GRB 060204C: ROTSE-III Optical Limits
  79. GRB 060204C: Swift-BAT detection of a burst
  80. GRB 060124: Radio Observations
  81. GRB 060204B: ART optical limit
  82. GRB 060204A: further INTEGRAL results
  83. GRB060204B, optical observation
  84. GRB060204B - SDSS pre-burst observations
  85. GRB 060203: Swift-BAT refined analysis
  86. GRB 060204B: Swift detection of a burst
  87. GRB 060204: a long GRB detected by INTEGRAL
  88. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  89. GRB 060203: RTT150 optical observations
  90. GRB060203: Swift XRT Team Refined Analysis
  91. GRB060203 - Swift UVOT observation
  92. Swift-BAT trigger is GRB 060203
  93. GRB 060203: IR Counterpart
  94. GRB060203: Observations with SARA
  95. GRB 060203: P60 Confirmation of Optical Afterglow
  96. Possible GRB 060203: candidate optical counterpart
  97. Swift BAT Trigger 180151: Swift XRT source detection
  98. Possible GRB 060203: optical observations at Asiago
  99. GRB 060202: PROMPT Observations
  100. Swift-BAT trigger 180151 is unknown origin at this time

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