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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"

39365 results found.

  1. GRB 060218/SN 2006aj: RBO optical observations
  2. GRB 060204B: GETS early limit
  3. GRB 060218: Refined analysis of the radio afterglow
  4. GRB 060223A:Xinglong optical limits
  5. GRB 060223B: ART optical limits
  6. GRB 060223B: Swift-BAT refined analysis
  7. GRB 060223a: Swift/UVOT refined analysis
  8. GRB 060223: Swift XRT Team preliminary analysis
  9. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  10. GRB 060223B: Swift detection of a bright burst
  11. GRB 060223: Swift-BAT refined analysis
  12. GRB 060218: rebrightening
  13. GRB 060218/SN 2006aj: optical observations
  14. GRB 060223: Keck redshift
  15. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  16. GRB 060223: Swift detection of a burst
  17. Spectral properties of GRB060218/SN2006aj
  18. GRB 060219: Swift-BAT refined analysis
  19. GRB 060218: rebrightening
  20. GRB 060218: emergence of the underlying SN spectrum
  21. GRB 060218: Decline in r-band flux
  22. GRB 060218: spectroscopic observations
  23. GRB 060218: Further refined analysis of the Swift-BAT burst
  24. GRB 060218: Likely an underluminous GRB
  25. GRB060218: Optical Spectroscopy of GRB-SN
  26. GRB060218: VLT spectroscopy
  27. GRB 060218: Optical Observations at Xinglong Obs.
  28. GRB 060219: SDSS galaxy inside XRT error circle
  29. GRB060218: UV Detection and Light Curves
  30. GRB060219: SARA Observations
  31. GRB 060219: Swift/UVOT Upper Limits
  32. GRB 060219: Swift-XRT Team refined analysis
  33. GRB 051221B: Swift-XRT Team Refined Analysis
  34. GRB 060219: Partial refined analysis of the Swift-BAT burst
  35. GRB060218: Radio Afterglow Discovery
  36. GRB 060219: Swift-XRT position typo correction
  37. GRB 060218: MDM Redshift
  38. GRB 060219: Swift-XRT position
  39. GRB 060218: optical/nIR observations at La Palma
  40. GRB060219: SDSS pre-burst observations
  41. GRB 060219: Swift-BAT detection of a weak burst
  42. Oddball GRB 060218, transient or GRB?
  43. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  44. Brightening of the Optical Counterpart of the Possible GRB 060218
  45. GRB 060218: MDM Observations
  46. GRB 060218: Pre-burst detection of a possible host galaxy
  47. GRB 060218A: ROTSE-III Possible Optical Flare
  48. Preliminary refined analysis of the Swift-BAT trigger 191157
  49. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  50. GRB 060211B: Swift/UVOT Upper Limits
  51. GRB060218 : SDSS pre-burst observations
  52. GRB 060218: Swift XRT Position
  53. GRB 060218: Swift-BAT detection of a possible burst
  54. GRB 060213: optical afterglow not confirmed
  55. Swift UVOT observations of GRB060213
  56. GRB 060211B: Skynet Observations
  57. GRB 060213: optical afterglow candidate
  58. GRB060213: Swift XRT observations and possible afterglow candidate
  59. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  60. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  61. GRB060213: MASTER final result
  62. GRB 060211b: WIRO NIR Observations
  63. GRB060213:_MASTER_optical_observation
  64. Konus-Wind observation of bright hard GRB 060213
  65. GRB 060213: IPN localization
  66. GRB 060210: Radio Observations
  67. GRB 060211a: WIRO NIR Observations
  68. GRB060211B: REM optical and NIR observations
  69. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  70. GRB 060211A: Further refined analysis of the Swift burst
  71. GRB060121: optical observations
  72. GRB060110: optical observations
  73. GRB060105: optical observations
  74. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  75. GRB 060211b: P60 Observations
  76. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  77. GRB 060206: SOAR Detections
  78. GRB 050826: Optical Afterglow and Host Galaxy
  79. GRB 060210: Further refined analysis of the Swift-BAT burst
  80. GRB 060211B: Swift/BAT refined analysis
  81. GRB060210: Swift/UVOT Upper Limits
  82. GRB 060211B: Swift-XRT Team refined analysis
  83. GRB060211b: optical observation
  84. GRB 060210: Optical Observations
  85. GRB060211.7: MASTER_optical_observation under the snow
  86. GRB 060211A: Swift XRT Team Refined Analysis
  87. GRB 060211B: Swift-BAT detection of a burst
  88. GRB060211: Faulkes North observation
  89. GRB 060211: ROTSE-III Optical Limits
  90. GRB 060211: Swift detection of a long burst
  91. GRB 060210: Refined analysis of the Swift-BAT burst
  92. GRB060210: Swift XRT Refined Analysis
  93. GRB060206, optical observations
  94. GRB 060210 : Xinglong and Lulin optical limit
  95. GRB060210: Gemini absorption spectroscopy
  96. GRB 060210: optical evolution
  97. GRB060210:Faulkes Telescope North Afterglow Confirmation
  98. GRB 060210: candidate afterglow
  99. GRB 060210: Swift detection of a burst
  100. GRB 060206: Swift/UVOT Observations

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