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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"

42922 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: Further refined analysis of the Swift-BAT burst
  6. GRB 060218: Likely an underluminous GRB
  7. GRB060218: Optical Spectroscopy of GRB-SN
  8. GRB060218: VLT spectroscopy
  9. GRB 060218: Optical Observations at Xinglong Obs.
  10. GRB 060219: SDSS galaxy inside XRT error circle
  11. GRB060218: UV Detection and Light Curves
  12. GRB060219: SARA Observations
  13. GRB 060219: Swift-XRT Team refined analysis
  14. GRB 051221B: Swift-XRT Team Refined Analysis
  15. GRB 060219: Partial refined analysis of the Swift-BAT burst
  16. GRB060218: Radio Afterglow Discovery
  17. GRB 060218: MDM Redshift
  18. GRB 060218: optical/nIR observations at La Palma
  19. GRB060219: SDSS pre-burst observations
  20. GRB 060219: Swift-BAT detection of a weak burst
  21. Oddball GRB 060218, transient or GRB?
  22. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  23. Brightening of the Optical Counterpart of the Possible GRB 060218
  24. GRB 060218: MDM Observations
  25. GRB 060218: Pre-burst detection of a possible host galaxy
  26. GRB 060218A: ROTSE-III Possible Optical Flare
  27. GRB060218: Swift/XRT refined position of a possible burst
  28. Preliminary refined analysis of the Swift-BAT trigger 191157
  29. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  30. GRB 060211B: Swift/UVOT Upper Limits
  31. GRB060218 : SDSS pre-burst observations
  32. GRB 060218: Swift XRT Position
  33. GRB 060218: Swift-BAT detection of a possible burst
  34. GRB 060213: optical afterglow not confirmed
  35. Swift UVOT observations of GRB060213
  36. GRB 060211B: Skynet Observations
  37. GRB 060213: optical afterglow candidate
  38. GRB060213: Swift XRT observations and possible afterglow candidate
  39. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  40. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  41. GRB 060211b: WIRO NIR Observations
  42. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  43. Konus-Wind observation of bright hard GRB 060213
  44. GRB 060213: IPN localization
  45. GRB 060211a: WIRO NIR Observations
  46. GRB060211B: REM optical and NIR observations
  47. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  48. GRB 060211A: Further refined analysis of the Swift burst
  49. GRB060121: optical observations
  50. GRB060110: optical observations
  51. GRB060105: optical observations
  52. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  53. GRB 060211b: P60 Observations
  54. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  55. GRB 060206: SOAR Detections
  56. GRB 050826: Optical Afterglow and Host Galaxy
  57. GRB 060210: Further refined analysis of the Swift-BAT burst
  58. GRB 060211B: Swift/BAT refined analysis
  59. GRB 060211B: Swift-XRT Team refined analysis
  60. GRB060211b: optical observation
  61. GRB060211B: Swift/XRT position
  62. GRB 060210: Optical Observations
  63. GRB 060211A: Swift XRT Team Refined Analysis
  64. GRB 060211B: Swift-BAT detection of a burst
  65. GRB 060211: ROTSE-III Optical Limits
  66. GRB 060211: Swift detection of a long burst
  67. GRB 060210: Refined analysis of the Swift-BAT burst
  68. GRB060210: Swift XRT Refined Analysis
  69. GRB060206, optical observations
  70. GRB 060210 : Xinglong and Lulin optical limit
  71. GRB060210: Optical Observations
  72. GRB060210: Gemini absorption spectroscopy
  73. GRB060210: Early Optical Observations
  74. GRB 060210: optical evolution
  75. GRB060210:Faulkes Telescope North Afterglow Confirmation
  76. GRB 060210: Swift detection of a burst
  77. GRB060210: Optical afterglow
  78. GRB 060206: Swift/UVOT Observations
  79. GRB 060209 : TAROT optical observation
  80. GRB 060209(?): Swift-BAT detection of a possible burst
  81. GRB 060206: near-infrared observations (JK' imaging)
  82. GRB 060206: TTT Observations
  83. GRB 060206: More PROMPT Detections
  84. GRB 060206: Tenagra II Observations
  85. GRB 060206: PROMPT Detections
  86. Retraction of orphan GRB afterglow candidate
  87. GRB060204a: Swift XRT Source is not GRB Afterglow
  88. GRB 060206: optical observations at Asiago
  89. Orphan GRB Afterglow candidate
  90. GRB 060206: Subaru/FOCAS optical spectroscopy
  91. GRB 060206: IR Detection of the Afterglow
  92. GRB 060206: Lick 3m Spectroscopy
  93. GRB 060204A: ROSAT Pointing
  94. GRB 060206: Super-LOTIS observations
  95. GRB 060206: Swift-BAT refined analysis
  96. GRB 060206 : Lulin optical observations
  97. GRB060206: SDSS Pre-Burst Observations
  98. GRB060206: Swift XRT Refined Analysis
  99. GRB060206: Liverpool Telescope observation
  100. GRB 060206: Spectroscopic Redshift

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