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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"

41954 results found.

  1. GRB 060218: rebrightening
  2. GRB 060218: emergence of the underlying SN spectrum
  3. GRB 060218: Decline in r-band flux
  4. GRB 060218: spectroscopic observations
  5. GRB 060218: Likely an underluminous GRB
  6. GRB060218: Optical Spectroscopy of GRB-SN
  7. GRB060218: VLT spectroscopy
  8. GRB 060218: Optical Observations at Xinglong Obs.
  9. GRB 060219: SDSS galaxy inside XRT error circle
  10. GRB060218: UV Detection and Light Curves
  11. GRB060219: SARA Observations
  12. GRB 060219: Swift-XRT Team refined analysis
  13. GRB 051221B: Swift-XRT Team Refined Analysis
  14. GRB060218: Radio Afterglow Discovery
  15. GRB 060218: optical/nIR observations at La Palma
  16. GRB060219: SDSS pre-burst observations
  17. GRB 060219: Swift-BAT detection of a weak burst
  18. Oddball GRB 060218, transient or GRB?
  19. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  20. Brightening of the Optical Counterpart of the Possible GRB 060218
  21. GRB 060218: MDM Observations
  22. GRB 060218: Pre-burst detection of a possible host galaxy
  23. GRB 060218A: ROTSE-III Possible Optical Flare
  24. GRB060218: Swift/XRT refined position of a possible burst
  25. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  26. GRB060218 : SDSS pre-burst observations
  27. GRB 060218: Swift-BAT detection of a possible burst
  28. GRB 060213: optical afterglow not confirmed
  29. Swift UVOT observations of GRB060213
  30. GRB 060211B: Skynet Observations
  31. GRB 060213: optical afterglow candidate
  32. GRB060213: Swift XRT observations and possible afterglow candidate
  33. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  34. GRB 060211b: WIRO NIR Observations
  35. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  36. Konus-Wind observation of bright hard GRB 060213
  37. GRB 060213: IPN localization
  38. GRB 060210: Radio Observations
  39. GRB 060211a: WIRO NIR Observations
  40. GRB060211B: REM optical and NIR observations
  41. GRB 060211A: Further refined analysis of the Swift burst
  42. GRB060121: optical observations
  43. GRB060110: optical observations
  44. GRB060105: optical observations
  45. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  46. GRB 060211b: P60 Observations
  47. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  48. GRB 060206: SOAR Detections
  49. GRB 050826: Optical Afterglow and Host Galaxy
  50. GRB 060210: Further refined analysis of the Swift-BAT burst
  51. GRB 060211B: Swift/BAT refined analysis
  52. GRB060210: Swift/UVOT Upper Limits
  53. GRB 060211B: Swift-XRT Team refined analysis
  54. GRB060211b: optical observation
  55. GRB060211B: Swift/XRT position
  56. GRB 060210: Optical Observations
  57. GRB 060211A: Swift XRT Team Refined Analysis
  58. GRB 060211B: Swift-BAT detection of a burst
  59. GRB060211: Faulkes North observation
  60. GRB 060211: Swift detection of a long burst
  61. GRB 060210: Refined analysis of the Swift-BAT burst
  62. GRB060210: Swift XRT Refined Analysis
  63. GRB060206, optical observations
  64. GRB 060210 : Xinglong and Lulin optical limit
  65. GRB060210: Optical Observations
  66. GRB060210: Gemini absorption spectroscopy
  67. GRB060210: Early Optical Observations
  68. GRB 060210: optical evolution
  69. GRB060210:Faulkes Telescope North Afterglow Confirmation
  70. GRB 060210: candidate afterglow
  71. GRB 060210: Swift detection of a burst
  72. GRB060210: Optical afterglow
  73. GRB 060206: Swift/UVOT Observations
  74. GRB060209: RTT150 optical observations
  75. GRB 060209 : TAROT optical observation
  76. GRB 060209(?): Swift-BAT detection of a possible burst
  77. GRB 060206: near-infrared observations (JK' imaging)
  78. GRB 060206: WSRT Radio Observations
  79. GRB 060206: TTT Observations
  80. GRB 060206: More PROMPT Detections
  81. GRB 060121 : WIDGET Pre-trigger limit
  82. GRB 060206: Tenagra II Observations
  83. GRB 060206: PROMPT Detections
  84. GRB060204a: Swift XRT Source is not GRB Afterglow
  85. GRB 060206: optical observations at Asiago
  86. Orphan GRB Afterglow candidate
  87. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  88. GRB 060206: Subaru/FOCAS optical spectroscopy
  89. GRB 060206: IR Detection of the Afterglow
  90. GRB 060206: Lick 3m Spectroscopy
  91. GRB 060204A: ROSAT Pointing
  92. GRB 060206: Super-LOTIS observations
  93. GRB060204A: Swift/UVOT observations
  94. GRB 060206: Swift-BAT refined analysis
  95. GRB 060206 : Lulin optical observations
  96. GRB060206: SDSS Pre-Burst Observations
  97. GRB060206: Swift XRT Refined Analysis
  98. GRB060206: Liverpool Telescope observation
  99. GRB060206: P60 Optical Observations
  100. GRB 060206: KAIT observations

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