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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"

32688 results found.

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

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