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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"

32766 results found.

  1. GRB 060218: Optical Observations at Xinglong Obs.
  2. GRB 060219: SDSS galaxy inside XRT error circle
  3. GRB060218: UV Detection and Light Curves
  4. GRB060219: SARA Observations
  5. GRB 060219: Swift/UVOT Upper Limits
  6. GRB 060219: Swift-XRT Team refined analysis
  7. GRB 051221B: Swift-XRT Team Refined Analysis
  8. GRB 060219: Partial refined analysis of the Swift-BAT burst
  9. GRB060218: Radio Afterglow Discovery
  10. GRB 060219: Swift-XRT position typo correction
  11. GRB 060219: Swift-XRT position
  12. GRB 060218: optical/nIR observations at La Palma
  13. GRB060219: SDSS pre-burst observations
  14. Oddball GRB 060218, transient or GRB?
  15. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  16. Brightening of the Optical Counterpart of the Possible GRB 060218
  17. GRB 060218: MDM Observations
  18. GRB 060218: Pre-burst detection of a possible host galaxy
  19. GRB 060218A: ROTSE-III Possible Optical Flare
  20. GRB060218: Swift/XRT refined position of a possible burst
  21. Preliminary refined analysis of the Swift-BAT trigger 191157
  22. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  23. GRB 060211B: Swift/UVOT Upper Limits
  24. GRB060218 : SDSS pre-burst observations
  25. GRB 060218: Swift XRT Position
  26. GRB 060213: optical afterglow not confirmed
  27. Swift UVOT observations of GRB060213
  28. GRB 060211B: Skynet Observations
  29. GRB 060213: optical afterglow candidate
  30. GRB060213: Swift XRT observations and possible afterglow candidate
  31. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  32. GRB060213: MASTER final result
  33. GRB 060211b: WIRO NIR Observations
  34. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  35. Konus-Wind observation of bright hard GRB 060213
  36. GRB 060210: Radio Observations
  37. GRB 060211a: WIRO NIR Observations
  38. GRB060211B: REM optical and NIR observations
  39. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  40. GRB 060211A: Further refined analysis of the Swift burst
  41. GRB060121: optical observations
  42. GRB060110: optical observations
  43. GRB060105: optical observations
  44. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  45. GRB 060211b: P60 Observations
  46. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  47. GRB 060206: SOAR Detections
  48. GRB 050826: Optical Afterglow and Host Galaxy
  49. GRB 060210: Further refined analysis of the Swift-BAT burst
  50. GRB 060211B: Swift/BAT refined analysis
  51. GRB060210: Swift/UVOT Upper Limits
  52. GRB 060211B: Swift-XRT Team refined analysis
  53. GRB060211b: optical observation
  54. GRB060211B: Swift/XRT position
  55. GRB 060210: Optical Observations
  56. GRB 060211A: Swift XRT Team Refined Analysis
  57. GRB060211: Faulkes North observation
  58. GRB 060211: ROTSE-III Optical Limits
  59. GRB 060210: Refined analysis of the Swift-BAT burst
  60. GRB060210: Swift XRT Refined Analysis
  61. GRB060206, optical observations
  62. GRB060210: Optical Observations
  63. GRB060210: Gemini absorption spectroscopy
  64. GRB060210: Early Optical Observations
  65. GRB060210:Faulkes Telescope North Afterglow Confirmation
  66. GRB 060206: Swift/UVOT Observations
  67. GRB060209: RTT150 optical observations
  68. GRB 060209 : TAROT optical observation
  69. GRB 060206: near-infrared observations (JK' imaging)
  70. GRB 060206: WSRT Radio Observations
  71. GRB 060203: Swift/UVOT upper limits
  72. GRB 060206: TTT Observations
  73. GRB 060206: More PROMPT Detections
  74. GRB 060121 : WIDGET Pre-trigger limit
  75. GRB 060206: Tenagra II Observations
  76. GRB 060206: PROMPT Detections
  77. GRB060204a: Swift XRT Source is not GRB Afterglow
  78. GRB 060206: optical observations at Asiago
  79. Orphan GRB Afterglow candidate
  80. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  81. GRB 060206: Subaru/FOCAS optical spectroscopy
  82. GRB 060206: IR Detection of the Afterglow
  83. GRB 060206: Lick 3m Spectroscopy
  84. GRB 060204A: ROSAT Pointing
  85. GRB 060206: Super-LOTIS observations
  86. GRB060204A: Swift/UVOT observations
  87. GRB 060206: Swift-BAT refined analysis
  88. GRB060206: SDSS Pre-Burst Observations
  89. GRB060206: Swift XRT Refined Analysis
  90. GRB060206: Liverpool Telescope observation
  91. GRB 060206: Spectroscopic Redshift
  92. GRB060206: P60 Optical Observations
  93. GRB 060206: KAIT observations
  94. GRB060206: Swift XRT Position
  95. GRB060206: SARA Detection
  96. GRB 060206: RAPTOR observations of afterglow candidate variability.
  97. GRB 060206: High redshift burst
  98. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  99. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  100. GRB060206: Optical afterglow

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