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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"

37563 results found.

  1. GRB 060223B: Swift detection of a bright burst
  2. GRB 060223: Swift-BAT refined analysis
  3. GRB 060218: rebrightening
  4. GRB 060218/SN 2006aj: optical observations
  5. GRB 060223: Keck redshift
  6. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  7. GRB 060223: Swift detection of a burst
  8. Spectral properties of GRB060218/SN2006aj
  9. GRB 060219: Swift-BAT refined analysis
  10. GRB 060218: rebrightening
  11. GRB 060218: emergence of the underlying SN spectrum
  12. GRB 060218: Decline in r-band flux
  13. GRB 060218: spectroscopic observations
  14. GRB 060218: Further refined analysis of the Swift-BAT burst
  15. GRB 060218: Likely an underluminous GRB
  16. GRB060218: Optical Spectroscopy of GRB-SN
  17. GRB060218: VLT spectroscopy
  18. GRB 060218: Optical Observations at Xinglong Obs.
  19. GRB 060219: SDSS galaxy inside XRT error circle
  20. GRB060218: UV Detection and Light Curves
  21. GRB060219: SARA Observations
  22. GRB 060219: Swift/UVOT Upper Limits
  23. GRB 060219: Swift-XRT Team refined analysis
  24. GRB 051221B: Swift-XRT Team Refined Analysis
  25. GRB 060219: Partial refined analysis of the Swift-BAT burst
  26. GRB060218: Radio Afterglow Discovery
  27. GRB 060219: Swift-XRT position typo correction
  28. GRB 060218: MDM Redshift
  29. GRB 060219: Swift-XRT position
  30. GRB 060218: optical/nIR observations at La Palma
  31. GRB060219: SDSS pre-burst observations
  32. GRB 060219: Swift-BAT detection of a weak burst
  33. Oddball GRB 060218, transient or GRB?
  34. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  35. Brightening of the Optical Counterpart of the Possible GRB 060218
  36. GRB 060218: MDM Observations
  37. GRB 060218: Pre-burst detection of a possible host galaxy
  38. GRB 060218A: ROTSE-III Possible Optical Flare
  39. Preliminary refined analysis of the Swift-BAT trigger 191157
  40. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  41. GRB 060211B: Swift/UVOT Upper Limits
  42. GRB060218 : SDSS pre-burst observations
  43. GRB 060218: Swift XRT Position
  44. GRB 060218: Swift-BAT detection of a possible burst
  45. GRB 060213: optical afterglow not confirmed
  46. Swift UVOT observations of GRB060213
  47. GRB 060211B: Skynet Observations
  48. GRB 060213: optical afterglow candidate
  49. GRB060213: Swift XRT observations and possible afterglow candidate
  50. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  51. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  52. GRB060213: MASTER final result
  53. GRB 060211b: WIRO NIR Observations
  54. GRB060213:_MASTER_optical_observation
  55. Konus-Wind observation of bright hard GRB 060213
  56. GRB 060213: IPN localization
  57. GRB 060210: Radio Observations
  58. GRB 060211a: WIRO NIR Observations
  59. GRB060211B: REM optical and NIR observations
  60. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  61. GRB 060211A: Further refined analysis of the Swift burst
  62. GRB060121: optical observations
  63. GRB060110: optical observations
  64. GRB060105: optical observations
  65. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  66. GRB 060211b: P60 Observations
  67. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  68. GRB 060206: SOAR Detections
  69. GRB 050826: Optical Afterglow and Host Galaxy
  70. GRB 060210: Further refined analysis of the Swift-BAT burst
  71. GRB 060211B: Swift/BAT refined analysis
  72. GRB060210: Swift/UVOT Upper Limits
  73. GRB 060211B: Swift-XRT Team refined analysis
  74. GRB060211b: optical observation
  75. GRB 060210: Optical Observations
  76. GRB060211.7: MASTER_optical_observation under the snow
  77. GRB 060211A: Swift XRT Team Refined Analysis
  78. GRB 060211B: Swift-BAT detection of a burst
  79. GRB060211: Faulkes North observation
  80. GRB 060211: ROTSE-III Optical Limits
  81. GRB 060211: Swift detection of a long burst
  82. GRB 060210: Refined analysis of the Swift-BAT burst
  83. GRB060210: Swift XRT Refined Analysis
  84. GRB060206, optical observations
  85. GRB 060210 : Xinglong and Lulin optical limit
  86. GRB060210: Gemini absorption spectroscopy
  87. GRB 060210: optical evolution
  88. GRB060210:Faulkes Telescope North Afterglow Confirmation
  89. GRB 060210: candidate afterglow
  90. GRB 060210: Swift detection of a burst
  91. GRB 060206: Swift/UVOT Observations
  92. Swift-BAT trigger 180931 is not a GRB
  93. GRB060209: RTT150 optical observations
  94. GRB 060209 : TAROT optical observation
  95. GRB060209A: MASTER optical observation
  96. GRB 060209(?): Swift-BAT detection of a possible burst
  97. GRB 060206: near-infrared observations (JK' imaging)
  98. GRB 060206: WSRT Radio Observations
  99. GRB 060203: Swift/UVOT upper limits
  100. GRB 060206: TTT Observations

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