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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"

37565 results found.

  1. GRB 060223: Swift XRT Team preliminary analysis
  2. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  3. GRB 060223B: Swift detection of a bright burst
  4. GRB 060223: Swift-BAT refined analysis
  5. GRB 060218: rebrightening
  6. GRB 060218/SN 2006aj: optical observations
  7. GRB 060223: Keck redshift
  8. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  9. GRB 060223: Swift detection of a burst
  10. Spectral properties of GRB060218/SN2006aj
  11. GRB 060219: Swift-BAT refined analysis
  12. GRB 060218: rebrightening
  13. GRB 060218: emergence of the underlying SN spectrum
  14. GRB 060218: Decline in r-band flux
  15. GRB 060218: spectroscopic observations
  16. GRB 060218: Further refined analysis of the Swift-BAT burst
  17. GRB 060218: Likely an underluminous GRB
  18. GRB060218: Optical Spectroscopy of GRB-SN
  19. GRB060218: VLT spectroscopy
  20. GRB 060218: Optical Observations at Xinglong Obs.
  21. GRB 060219: SDSS galaxy inside XRT error circle
  22. GRB060218: UV Detection and Light Curves
  23. GRB060219: SARA Observations
  24. GRB 060219: Swift/UVOT Upper Limits
  25. GRB 060219: Swift-XRT Team refined analysis
  26. GRB 051221B: Swift-XRT Team Refined Analysis
  27. GRB 060219: Partial refined analysis of the Swift-BAT burst
  28. GRB060218: Radio Afterglow Discovery
  29. GRB 060219: Swift-XRT position typo correction
  30. GRB 060218: MDM Redshift
  31. GRB 060219: Swift-XRT position
  32. GRB 060218: optical/nIR observations at La Palma
  33. GRB060219: SDSS pre-burst observations
  34. GRB 060219: Swift-BAT detection of a weak burst
  35. Oddball GRB 060218, transient or GRB?
  36. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  37. Brightening of the Optical Counterpart of the Possible GRB 060218
  38. GRB 060218: MDM Observations
  39. GRB 060218: Pre-burst detection of a possible host galaxy
  40. GRB 060218A: ROTSE-III Possible Optical Flare
  41. Preliminary refined analysis of the Swift-BAT trigger 191157
  42. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  43. GRB 060211B: Swift/UVOT Upper Limits
  44. GRB060218 : SDSS pre-burst observations
  45. GRB 060218: Swift XRT Position
  46. GRB 060218: Swift-BAT detection of a possible burst
  47. GRB 060213: optical afterglow not confirmed
  48. Swift UVOT observations of GRB060213
  49. GRB 060211B: Skynet Observations
  50. GRB 060213: optical afterglow candidate
  51. GRB060213: Swift XRT observations and possible afterglow candidate
  52. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  53. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  54. GRB060213: MASTER final result
  55. GRB 060211b: WIRO NIR Observations
  56. GRB060213:_MASTER_optical_observation
  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 060211B: BAT detects no additional burst emission beyond T + 122 sec
  63. GRB 060211A: Further refined analysis of the Swift burst
  64. GRB060121: optical observations
  65. GRB060110: optical observations
  66. GRB060105: optical observations
  67. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  68. GRB 060211b: P60 Observations
  69. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  70. GRB 060206: SOAR Detections
  71. GRB 050826: Optical Afterglow and Host Galaxy
  72. GRB 060210: Further refined analysis of the Swift-BAT burst
  73. GRB 060211B: Swift/BAT refined analysis
  74. GRB060210: Swift/UVOT Upper Limits
  75. GRB 060211B: Swift-XRT Team refined analysis
  76. GRB060211b: optical observation
  77. GRB 060210: Optical Observations
  78. GRB060211.7: MASTER_optical_observation under the snow
  79. GRB 060211A: Swift XRT Team Refined Analysis
  80. GRB 060211B: Swift-BAT detection of a burst
  81. GRB060211: Faulkes North observation
  82. GRB 060211: ROTSE-III Optical Limits
  83. GRB 060211: Swift detection of a long burst
  84. GRB 060210: Refined analysis of the Swift-BAT burst
  85. GRB060210: Swift XRT Refined Analysis
  86. GRB060206, optical observations
  87. GRB 060210 : Xinglong and Lulin optical limit
  88. GRB060210: Gemini absorption spectroscopy
  89. GRB 060210: optical evolution
  90. GRB060210:Faulkes Telescope North Afterglow Confirmation
  91. GRB 060210: candidate afterglow
  92. GRB 060210: Swift detection of a burst
  93. GRB 060206: Swift/UVOT Observations
  94. Swift-BAT trigger 180931 is not a GRB
  95. GRB060209: RTT150 optical observations
  96. GRB 060209 : TAROT optical observation
  97. GRB060209A: MASTER optical observation
  98. GRB 060209(?): Swift-BAT detection of a possible burst
  99. GRB 060206: near-infrared observations (JK' imaging)
  100. GRB 060206: WSRT Radio Observations

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