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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"

32685 results found.

  1. GRB 060223a: Swift/UVOT refined analysis
  2. GRB 060223: Swift XRT Team preliminary analysis
  3. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  4. GRB 060223B: Swift detection of a bright burst
  5. GRB 060223: Swift-BAT refined analysis
  6. Correction to GCN 4816 on GRB060218
  7. GRB 060218/SN 2006aj: optical observations
  8. GRB060218: Optical brightening in V and R
  9. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  10. Spectral properties of GRB060218/SN2006aj
  11. GRB 060219: Swift-BAT refined analysis
  12. GRB 060218: rebrightening
  13. GRB 060218: emergence of the underlying SN spectrum
  14. GRB 060218: Decline in r-band flux
  15. GRB 060218: spectroscopic observations
  16. GRB 060218: Further refined analysis of the Swift-BAT burst
  17. GRB 060218: Likely an underluminous GRB
  18. GRB060218: Optical Spectroscopy of GRB-SN
  19. GRB060218: VLT spectroscopy
  20. GRB 060218: Optical Observations at Xinglong Obs.
  21. GRB 060219: SDSS galaxy inside XRT error circle
  22. GRB060218: UV Detection and Light Curves
  23. GRB060219: SARA Observations
  24. GRB 060219: Swift/UVOT Upper Limits
  25. GRB 060219: Swift-XRT Team refined analysis
  26. GRB 051221B: Swift-XRT Team Refined Analysis
  27. GRB 060219: Partial refined analysis of the Swift-BAT burst
  28. GRB060218: Radio Afterglow Discovery
  29. GRB 060219: Swift-XRT position typo correction
  30. GRB 060219: Swift-XRT position
  31. GRB 060218: optical/nIR observations at La Palma
  32. GRB060219: SDSS pre-burst observations
  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. GRB060218: Swift/XRT refined position of a possible burst
  40. Preliminary refined analysis of the Swift-BAT trigger 191157
  41. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  42. GRB 060211B: Swift/UVOT Upper Limits
  43. GRB060218 : SDSS pre-burst observations
  44. GRB 060218: Swift XRT Position
  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 060206: Confirmation of Rapid Fading at Optical Wavelengths
  51. GRB060213: MASTER final result
  52. GRB 060211b: WIRO NIR Observations
  53. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  54. Konus-Wind observation of bright hard GRB 060213
  55. GRB 060210: Radio Observations
  56. GRB 060211a: WIRO NIR Observations
  57. GRB060211B: REM optical and NIR observations
  58. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  59. GRB 060211A: Further refined analysis of the Swift burst
  60. GRB060121: optical observations
  61. GRB060110: optical observations
  62. GRB060105: optical observations
  63. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  64. GRB 060211b: P60 Observations
  65. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  66. GRB 060206: SOAR Detections
  67. GRB 050826: Optical Afterglow and Host Galaxy
  68. GRB 060210: Further refined analysis of the Swift-BAT burst
  69. GRB 060211B: Swift/BAT refined analysis
  70. GRB060210: Swift/UVOT Upper Limits
  71. GRB 060211B: Swift-XRT Team refined analysis
  72. GRB060211b: optical observation
  73. GRB060211B: Swift/XRT position
  74. GRB 060210: Optical Observations
  75. GRB 060211A: Swift XRT Team Refined Analysis
  76. GRB060211: Faulkes North observation
  77. GRB 060211: ROTSE-III Optical Limits
  78. GRB 060210: Refined analysis of the Swift-BAT burst
  79. GRB060210: Swift XRT Refined Analysis
  80. GRB060206, optical observations
  81. GRB060210: Optical Observations
  82. GRB060210: Gemini absorption spectroscopy
  83. GRB060210: Early Optical Observations
  84. GRB060210:Faulkes Telescope North Afterglow Confirmation
  85. GRB 060206: Swift/UVOT Observations
  86. GRB060209: RTT150 optical observations
  87. GRB 060209 : TAROT optical observation
  88. GRB 060206: near-infrared observations (JK' imaging)
  89. GRB 060206: WSRT Radio Observations
  90. GRB 060203: Swift/UVOT upper limits
  91. GRB 060206: TTT Observations
  92. GRB 060206: More PROMPT Detections
  93. GRB 060121 : WIDGET Pre-trigger limit
  94. GRB 060206: Tenagra II Observations
  95. GRB 060206: PROMPT Detections
  96. GRB060204a: Swift XRT Source is not GRB Afterglow
  97. GRB 060206: optical observations at Asiago
  98. Orphan GRB Afterglow candidate
  99. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  100. GRB 060206: Subaru/FOCAS optical spectroscopy

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