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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"

32568 results found.

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

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