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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"

32769 results found.

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

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