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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"

39325 results found.

  1. GRB 060219: Swift-BAT detection of a weak burst
  2. Oddball GRB 060218, transient or GRB?
  3. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  4. Brightening of the Optical Counterpart of the Possible GRB 060218
  5. GRB 060218: MDM Observations
  6. GRB 060218: Pre-burst detection of a possible host galaxy
  7. GRB 060218A: ROTSE-III Possible Optical Flare
  8. Preliminary refined analysis of the Swift-BAT trigger 191157
  9. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  10. GRB 060211B: Swift/UVOT Upper Limits
  11. GRB060218 : SDSS pre-burst observations
  12. GRB 060218: Swift XRT Position
  13. GRB 060218: Swift-BAT detection of a possible burst
  14. GRB 060213: optical afterglow not confirmed
  15. Swift UVOT observations of GRB060213
  16. GRB 060211B: Skynet Observations
  17. GRB 060213: optical afterglow candidate
  18. GRB060213: Swift XRT observations and possible afterglow candidate
  19. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  20. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  21. GRB060213: MASTER final result
  22. GRB 060211b: WIRO NIR Observations
  23. GRB060213:_MASTER_optical_observation
  24. Konus-Wind observation of bright hard GRB 060213
  25. GRB 060213: IPN localization
  26. GRB 060210: Radio Observations
  27. GRB 060211a: WIRO NIR Observations
  28. GRB060211B: REM optical and NIR observations
  29. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  30. GRB 060211A: Further refined analysis of the Swift burst
  31. GRB060121: optical observations
  32. GRB060110: optical observations
  33. GRB060105: optical observations
  34. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  35. GRB 060211b: P60 Observations
  36. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  37. GRB 060206: SOAR Detections
  38. GRB 050826: Optical Afterglow and Host Galaxy
  39. GRB 060210: Further refined analysis of the Swift-BAT burst
  40. GRB 060211B: Swift/BAT refined analysis
  41. GRB060210: Swift/UVOT Upper Limits
  42. GRB 060211B: Swift-XRT Team refined analysis
  43. GRB060211b: optical observation
  44. GRB 060210: Optical Observations
  45. GRB060211.7: MASTER_optical_observation under the snow
  46. GRB 060211A: Swift XRT Team Refined Analysis
  47. GRB 060211B: Swift-BAT detection of a burst
  48. GRB060211: Faulkes North observation
  49. GRB 060211: ROTSE-III Optical Limits
  50. GRB 060211: Swift detection of a long burst
  51. GRB 060210: Refined analysis of the Swift-BAT burst
  52. GRB060210: Swift XRT Refined Analysis
  53. GRB060206, optical observations
  54. GRB 060210 : Xinglong and Lulin optical limit
  55. GRB060210: Gemini absorption spectroscopy
  56. GRB 060210: optical evolution
  57. GRB060210:Faulkes Telescope North Afterglow Confirmation
  58. GRB 060210: candidate afterglow
  59. GRB 060210: Swift detection of a burst
  60. GRB 060206: Swift/UVOT Observations
  61. Swift-BAT trigger 180931 is not a GRB
  62. GRB060209: RTT150 optical observations
  63. GRB 060209 : TAROT optical observation
  64. GRB060209A: MASTER optical observation
  65. GRB 060209(?): Swift-BAT detection of a possible burst
  66. GRB 060206: near-infrared observations (JK' imaging)
  67. GRB 060206: WSRT Radio Observations
  68. GRB 060203: Swift/UVOT upper limits
  69. GRB 060206: TTT Observations
  70. GRB 060206: More PROMPT Detections
  71. GRB 060121 : WIDGET Pre-trigger limit
  72. GRB 060206: Tenagra II Observations
  73. GRB 060206: PROMPT Detections
  74. Retraction of orphan GRB afterglow candidate
  75. GRB060204a: Swift XRT Source is not GRB Afterglow
  76. GRB 060206: optical observations at Asiago
  77. Orphan GRB Afterglow candidate
  78. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  79. GRB 060206: Subaru/FOCAS optical spectroscopy
  80. GRB 060206: IR Detection of the Afterglow
  81. GRB 060206: Lick 3m Spectroscopy
  82. GRB 060204A: ROSAT Pointing
  83. GRB 060206: Super-LOTIS observations
  84. GRB060204A: Swift/UVOT observations
  85. GRB 060206: Swift-BAT refined analysis
  86. GRB 060206 : Lulin optical observations
  87. GRB060206: SDSS Pre-Burst Observations
  88. GRB060206: Swift XRT Refined Analysis
  89. GRB060206: Liverpool Telescope observation
  90. GRB 060206: Spectroscopic Redshift
  91. GRB060206: P60 Optical Observations
  92. GRB 060206: KAIT observations
  93. GRB060206: Swift XRT Position
  94. GRB060206: SARA Detection
  95. GRB 060206: RAPTOR observations of afterglow candidate variability.
  96. GRB 060206: High redshift burst
  97. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  98. GRB060206: Swift-BAT detection of a burst
  99. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  100. BAT GRB 060204C is probably not a GRB

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