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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"

36340 results found.

  1. GRB 060218: optical/nIR observations at La Palma
  2. GRB060219: SDSS pre-burst observations
  3. GRB 060219: Swift-BAT detection of a weak burst
  4. Oddball GRB 060218, transient or GRB?
  5. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  6. Brightening of the Optical Counterpart of the Possible GRB 060218
  7. GRB 060218: MDM Observations
  8. GRB 060218: Pre-burst detection of a possible host galaxy
  9. GRB 060218A: ROTSE-III Possible Optical Flare
  10. Preliminary refined analysis of the Swift-BAT trigger 191157
  11. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  12. GRB 060211B: Swift/UVOT Upper Limits
  13. GRB060218 : SDSS pre-burst observations
  14. GRB 060218: Swift XRT Position
  15. GRB 060218: Swift-BAT detection of a possible burst
  16. GRB 060213: optical afterglow not confirmed
  17. Swift UVOT observations of GRB060213
  18. GRB 060211B: Skynet Observations
  19. GRB 060213: optical afterglow candidate
  20. GRB060213: Swift XRT observations and possible afterglow candidate
  21. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  22. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  23. GRB060213: MASTER final result
  24. GRB 060211b: WIRO NIR Observations
  25. GRB060213:_MASTER_optical_observation
  26. Konus-Wind observation of bright hard GRB 060213
  27. GRB 060213: IPN localization
  28. GRB 060210: Radio Observations
  29. GRB 060211a: WIRO NIR Observations
  30. GRB060211B: REM optical and NIR observations
  31. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  32. GRB 060211A: Further refined analysis of the Swift burst
  33. GRB060121: optical observations
  34. GRB060110: optical observations
  35. GRB060105: optical observations
  36. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  37. GRB 060211b: P60 Observations
  38. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  39. GRB 060206: SOAR Detections
  40. GRB 050826: Optical Afterglow and Host Galaxy
  41. GRB 060210: Further refined analysis of the Swift-BAT burst
  42. GRB 060211B: Swift/BAT refined analysis
  43. GRB060210: Swift/UVOT Upper Limits
  44. GRB 060211B: Swift-XRT Team refined analysis
  45. GRB060211b: optical observation
  46. GRB 060210: Optical Observations
  47. GRB060211.7: MASTER_optical_observation under the snow
  48. GRB 060211A: Swift XRT Team Refined Analysis
  49. GRB 060211B: Swift-BAT detection of a burst
  50. GRB060211: Faulkes North observation
  51. GRB 060211: ROTSE-III Optical Limits
  52. GRB 060211: Swift detection of a long burst
  53. GRB 060210: Refined analysis of the Swift-BAT burst
  54. GRB060210: Swift XRT Refined Analysis
  55. GRB060206, optical observations
  56. GRB 060210 : Xinglong and Lulin optical limit
  57. GRB060210: Gemini absorption spectroscopy
  58. GRB 060210: optical evolution
  59. GRB060210:Faulkes Telescope North Afterglow Confirmation
  60. GRB 060210: candidate afterglow
  61. GRB 060210: Swift detection of a burst
  62. GRB 060206: Swift/UVOT Observations
  63. Swift-BAT trigger 180931 is not a GRB
  64. GRB060209: RTT150 optical observations
  65. GRB 060209 : TAROT optical observation
  66. GRB060209A: MASTER optical observation
  67. GRB 060209(?): Swift-BAT detection of a possible burst
  68. GRB 060206: near-infrared observations (JK' imaging)
  69. GRB 060206: WSRT Radio Observations
  70. GRB 060203: Swift/UVOT upper limits
  71. GRB 060206: TTT Observations
  72. GRB 060206: More PROMPT Detections
  73. GRB 060121 : WIDGET Pre-trigger limit
  74. GRB 060206: Tenagra II Observations
  75. GRB 060206: PROMPT Detections
  76. Retraction of orphan GRB afterglow candidate
  77. GRB060204a: Swift XRT Source is not GRB Afterglow
  78. GRB 060206: optical observations at Asiago
  79. Orphan GRB Afterglow candidate
  80. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  81. GRB 060206: Subaru/FOCAS optical spectroscopy
  82. GRB 060206: IR Detection of the Afterglow
  83. GRB 060206: Lick 3m Spectroscopy
  84. GRB 060204A: ROSAT Pointing
  85. GRB 060206: Super-LOTIS observations
  86. GRB060204A: Swift/UVOT observations
  87. GRB 060206: Swift-BAT refined analysis
  88. GRB 060206 : Lulin optical observations
  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. GRB 060204C: XRT analysis of Swift J061223.0+701243.9

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