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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"

32767 results found.

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

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