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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"

42293 results found.

  1. GRB 060204B: GETS early limit
  2. GRB 060218: Refined analysis of the radio afterglow
  3. GRB 060223A:Xinglong optical limits
  4. GRB 060223B: ART optical limits
  5. GRB 060223B: Swift-BAT refined analysis
  6. GRB 060223: Swift XRT Team preliminary analysis
  7. GRB 060223B: Swift detection of a bright burst
  8. GRB 060218: rebrightening
  9. Correction to GCN 4816 on GRB060218
  10. GRB 060218/SN 2006aj: optical observations
  11. GRB060218: Optical brightening in V and R
  12. GRB 060223: Keck redshift
  13. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  14. GRB 060223: Swift detection of a burst
  15. Spectral properties of GRB060218/SN2006aj
  16. GRB 060218: rebrightening
  17. GRB 060218: emergence of the underlying SN spectrum
  18. GRB 060218: Decline in r-band flux
  19. GRB 060218: spectroscopic observations
  20. GRB 060218: Further refined analysis of the Swift-BAT burst
  21. GRB 060218: Likely an underluminous GRB
  22. GRB060218: Optical Spectroscopy of GRB-SN
  23. GRB060218: VLT spectroscopy
  24. GRB 060218: Optical Observations at Xinglong Obs.
  25. GRB 060219: SDSS galaxy inside XRT error circle
  26. GRB060218: UV Detection and Light Curves
  27. GRB060219: SARA Observations
  28. GRB 060219: Swift/UVOT Upper Limits
  29. GRB 060219: Swift-XRT Team refined analysis
  30. GRB 051221B: Swift-XRT Team Refined Analysis
  31. GRB060218: Radio Afterglow Discovery
  32. GRB 060219: Swift-XRT position typo correction
  33. GRB 060218: MDM Redshift
  34. GRB 060219: Swift-XRT position
  35. GRB 060218: optical/nIR observations at La Palma
  36. GRB060219: SDSS pre-burst observations
  37. GRB 060219: Swift-BAT detection of a weak burst
  38. Oddball GRB 060218, transient or GRB?
  39. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  40. Brightening of the Optical Counterpart of the Possible GRB 060218
  41. GRB 060218: MDM Observations
  42. GRB 060218: Pre-burst detection of a possible host galaxy
  43. GRB 060218A: ROTSE-III Possible Optical Flare
  44. GRB060218: Swift/XRT refined position of a possible burst
  45. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  46. GRB060218 : SDSS pre-burst observations
  47. GRB 060218: Swift XRT Position
  48. GRB 060218: Swift-BAT detection of a possible burst
  49. GRB 060213: optical afterglow not confirmed
  50. Swift UVOT observations of GRB060213
  51. GRB 060211B: Skynet Observations
  52. GRB 060213: optical afterglow candidate
  53. GRB060213: Swift XRT observations and possible afterglow candidate
  54. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  55. GRB 060211b: WIRO NIR Observations
  56. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  57. Konus-Wind observation of bright hard GRB 060213
  58. GRB 060213: IPN localization
  59. GRB 060210: Radio Observations
  60. GRB 060211a: WIRO NIR Observations
  61. GRB060211B: REM optical and NIR observations
  62. GRB 060211A: Further refined analysis of the Swift burst
  63. GRB060121: optical observations
  64. GRB060110: optical observations
  65. GRB060105: optical observations
  66. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  67. GRB 060211b: P60 Observations
  68. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  69. GRB 060206: SOAR Detections
  70. GRB 050826: Optical Afterglow and Host Galaxy
  71. GRB 060210: Further refined analysis of the Swift-BAT burst
  72. GRB 060211B: Swift/BAT refined analysis
  73. GRB060210: Swift/UVOT Upper Limits
  74. GRB 060211B: Swift-XRT Team refined analysis
  75. GRB060211b: optical observation
  76. GRB060211B: Swift/XRT position
  77. GRB 060210: Optical Observations
  78. GRB 060211A: Swift XRT Team Refined Analysis
  79. GRB 060211B: Swift-BAT detection of a burst
  80. GRB060211: Faulkes North observation
  81. GRB 060211: ROTSE-III Optical Limits
  82. GRB 060211: Swift detection of a long burst
  83. GRB 060210: Refined analysis of the Swift-BAT burst
  84. GRB060210: Swift XRT Refined Analysis
  85. GRB060206, optical observations
  86. GRB 060210 : Xinglong and Lulin optical limit
  87. GRB060210: Optical Observations
  88. GRB060210: Gemini absorption spectroscopy
  89. GRB060210: Early Optical Observations
  90. GRB 060210: optical evolution
  91. GRB060210:Faulkes Telescope North Afterglow Confirmation
  92. GRB 060210: candidate afterglow
  93. GRB 060210: Swift detection of a burst
  94. GRB060210: Optical afterglow
  95. GRB 060206: Swift/UVOT Observations
  96. GRB060209: RTT150 optical observations
  97. GRB 060209 : TAROT optical observation
  98. GRB060209A: MASTER optical observation
  99. GRB 060209(?): Swift-BAT detection of a possible burst
  100. GRB 060206: near-infrared observations (JK' imaging)

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