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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"

36341 results found.

  1. GRB 060219: Swift-XRT position
  2. GRB 060218: optical/nIR observations at La Palma
  3. GRB060219: SDSS pre-burst observations
  4. GRB 060219: Swift-BAT detection of a weak burst
  5. Oddball GRB 060218, transient or GRB?
  6. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  7. Brightening of the Optical Counterpart of the Possible GRB 060218
  8. GRB 060218: MDM Observations
  9. GRB 060218: Pre-burst detection of a possible host galaxy
  10. GRB 060218A: ROTSE-III Possible Optical Flare
  11. Preliminary refined analysis of the Swift-BAT trigger 191157
  12. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  13. GRB 060211B: Swift/UVOT Upper Limits
  14. GRB060218 : SDSS pre-burst observations
  15. GRB 060218: Swift XRT Position
  16. GRB 060218: Swift-BAT detection of a possible burst
  17. GRB 060213: optical afterglow not confirmed
  18. Swift UVOT observations of GRB060213
  19. GRB 060211B: Skynet Observations
  20. GRB 060213: optical afterglow candidate
  21. GRB060213: Swift XRT observations and possible afterglow candidate
  22. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  23. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  24. GRB060213: MASTER final result
  25. GRB 060211b: WIRO NIR Observations
  26. GRB060213:_MASTER_optical_observation
  27. Konus-Wind observation of bright hard GRB 060213
  28. GRB 060213: IPN localization
  29. GRB 060210: Radio Observations
  30. GRB 060211a: WIRO NIR Observations
  31. GRB060211B: REM optical and NIR observations
  32. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  33. GRB 060211A: Further refined analysis of the Swift burst
  34. GRB060121: optical observations
  35. GRB060110: optical observations
  36. GRB060105: optical observations
  37. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  38. GRB 060211b: P60 Observations
  39. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  40. GRB 060206: SOAR Detections
  41. GRB 050826: Optical Afterglow and Host Galaxy
  42. GRB 060210: Further refined analysis of the Swift-BAT burst
  43. GRB 060211B: Swift/BAT refined analysis
  44. GRB060210: Swift/UVOT Upper Limits
  45. GRB 060211B: Swift-XRT Team refined analysis
  46. GRB060211b: optical observation
  47. GRB 060210: Optical Observations
  48. GRB060211.7: MASTER_optical_observation under the snow
  49. GRB 060211A: Swift XRT Team Refined Analysis
  50. GRB 060211B: Swift-BAT detection of a burst
  51. GRB060211: Faulkes North observation
  52. GRB 060211: ROTSE-III Optical Limits
  53. GRB 060211: Swift detection of a long burst
  54. GRB 060210: Refined analysis of the Swift-BAT burst
  55. GRB060210: Swift XRT Refined Analysis
  56. GRB060206, optical observations
  57. GRB 060210 : Xinglong and Lulin optical limit
  58. GRB060210: Gemini absorption spectroscopy
  59. GRB 060210: optical evolution
  60. GRB060210:Faulkes Telescope North Afterglow Confirmation
  61. GRB 060210: candidate afterglow
  62. GRB 060210: Swift detection of a burst
  63. GRB 060206: Swift/UVOT Observations
  64. Swift-BAT trigger 180931 is not a GRB
  65. GRB060209: RTT150 optical observations
  66. GRB 060209 : TAROT optical observation
  67. GRB060209A: MASTER optical observation
  68. GRB 060209(?): Swift-BAT detection of a possible burst
  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. Retraction of orphan GRB afterglow candidate
  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. GRB 060206 : Lulin optical observations
  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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