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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"

42910 results found.

  1. GRB 060219: Swift-XRT Team refined analysis
  2. GRB 051221B: Swift-XRT Team Refined Analysis
  3. GRB 060219: Partial refined analysis of the Swift-BAT burst
  4. GRB060218: Radio Afterglow Discovery
  5. GRB 060218: MDM Redshift
  6. GRB 060218: optical/nIR observations at La Palma
  7. GRB060219: SDSS pre-burst observations
  8. GRB 060219: Swift-BAT detection of a weak burst
  9. Oddball GRB 060218, transient or GRB?
  10. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  11. Brightening of the Optical Counterpart of the Possible GRB 060218
  12. GRB 060218: MDM Observations
  13. GRB 060218: Pre-burst detection of a possible host galaxy
  14. GRB 060218A: ROTSE-III Possible Optical Flare
  15. GRB060218: Swift/XRT refined position of a possible burst
  16. Preliminary refined analysis of the Swift-BAT trigger 191157
  17. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  18. GRB 060211B: Swift/UVOT Upper Limits
  19. GRB060218 : SDSS pre-burst observations
  20. GRB 060218: Swift XRT Position
  21. GRB 060218: Swift-BAT detection of a possible burst
  22. GRB 060213: optical afterglow not confirmed
  23. Swift UVOT observations of GRB060213
  24. GRB 060211B: Skynet Observations
  25. GRB 060213: optical afterglow candidate
  26. GRB060213: Swift XRT observations and possible afterglow candidate
  27. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  28. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  29. GRB 060211b: WIRO NIR Observations
  30. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  31. Konus-Wind observation of bright hard GRB 060213
  32. GRB 060213: IPN localization
  33. GRB 060211a: WIRO NIR Observations
  34. GRB060211B: REM optical and NIR observations
  35. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  36. GRB 060211A: Further refined analysis of the Swift burst
  37. GRB060121: optical observations
  38. GRB060110: optical observations
  39. GRB060105: optical observations
  40. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  41. GRB 060211b: P60 Observations
  42. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  43. GRB 060206: SOAR Detections
  44. GRB 050826: Optical Afterglow and Host Galaxy
  45. GRB 060210: Further refined analysis of the Swift-BAT burst
  46. GRB 060211B: Swift/BAT refined analysis
  47. GRB 060211B: Swift-XRT Team refined analysis
  48. GRB060211b: optical observation
  49. GRB060211B: Swift/XRT position
  50. GRB 060210: Optical Observations
  51. GRB 060211A: Swift XRT Team Refined Analysis
  52. GRB 060211B: Swift-BAT detection of a burst
  53. GRB 060211: ROTSE-III Optical Limits
  54. GRB 060211: Swift detection of a long burst
  55. GRB 060210: Refined analysis of the Swift-BAT burst
  56. GRB060210: Swift XRT Refined Analysis
  57. GRB060206, optical observations
  58. GRB 060210 : Xinglong and Lulin optical limit
  59. GRB060210: Optical Observations
  60. GRB060210: Gemini absorption spectroscopy
  61. GRB060210: Early Optical Observations
  62. GRB 060210: optical evolution
  63. GRB060210:Faulkes Telescope North Afterglow Confirmation
  64. GRB 060210: Swift detection of a burst
  65. GRB060210: Optical afterglow
  66. GRB 060206: Swift/UVOT Observations
  67. GRB 060209 : TAROT optical observation
  68. GRB 060209(?): Swift-BAT detection of a possible burst
  69. GRB 060206: near-infrared observations (JK' imaging)
  70. GRB 060206: TTT Observations
  71. GRB 060206: More PROMPT Detections
  72. GRB 060206: Tenagra II Observations
  73. GRB 060206: PROMPT Detections
  74. Retraction of orphan GRB afterglow candidate
  75. GRB060204a: Swift XRT Source is not GRB Afterglow
  76. GRB 060206: optical observations at Asiago
  77. Orphan GRB Afterglow candidate
  78. GRB 060206: Subaru/FOCAS optical spectroscopy
  79. GRB 060206: IR Detection of the Afterglow
  80. GRB 060206: Lick 3m Spectroscopy
  81. GRB 060204A: ROSAT Pointing
  82. GRB 060206: Super-LOTIS observations
  83. GRB 060206: Swift-BAT refined analysis
  84. GRB 060206 : Lulin optical observations
  85. GRB060206: SDSS Pre-Burst Observations
  86. GRB060206: Swift XRT Refined Analysis
  87. GRB060206: Liverpool Telescope observation
  88. GRB 060206: Spectroscopic Redshift
  89. GRB060206: P60 Optical Observations
  90. GRB 060206: KAIT observations
  91. GRB060206: Swift XRT Position
  92. GRB060206: SARA Detection
  93. GRB 060206: RAPTOR observations of afterglow candidate variability.
  94. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  95. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  96. GRB060206: Swift-BAT detection of a burst
  97. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  98. GRB060204C: optical observation
  99. GRB 060204B: BVRi-band detections of optical afterglow
  100. GRB 060204A: Swift XRT upper limit

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