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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"

32764 results found.

  1. GRB060218: UV Detection and Light Curves
  2. GRB060219: SARA Observations
  3. GRB 060219: Swift/UVOT Upper Limits
  4. GRB 060219: Swift-XRT Team refined analysis
  5. GRB 051221B: Swift-XRT Team Refined Analysis
  6. GRB 060219: Partial refined analysis of the Swift-BAT burst
  7. GRB060218: Radio Afterglow Discovery
  8. GRB 060219: Swift-XRT position typo correction
  9. GRB 060219: Swift-XRT position
  10. GRB 060218: optical/nIR observations at La Palma
  11. GRB060219: SDSS pre-burst observations
  12. Oddball GRB 060218, transient or GRB?
  13. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  14. Brightening of the Optical Counterpart of the Possible GRB 060218
  15. GRB 060218: MDM Observations
  16. GRB 060218: Pre-burst detection of a possible host galaxy
  17. GRB 060218A: ROTSE-III Possible Optical Flare
  18. GRB060218: Swift/XRT refined position of a possible burst
  19. Preliminary refined analysis of the Swift-BAT trigger 191157
  20. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  21. GRB 060211B: Swift/UVOT Upper Limits
  22. GRB060218 : SDSS pre-burst observations
  23. GRB 060218: Swift XRT Position
  24. GRB 060213: optical afterglow not confirmed
  25. Swift UVOT observations of GRB060213
  26. GRB 060211B: Skynet Observations
  27. GRB 060213: optical afterglow candidate
  28. GRB060213: Swift XRT observations and possible afterglow candidate
  29. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  30. GRB060213: MASTER final result
  31. GRB 060211b: WIRO NIR Observations
  32. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  33. Konus-Wind observation of bright hard GRB 060213
  34. GRB 060210: Radio Observations
  35. GRB 060211a: WIRO NIR Observations
  36. GRB060211B: REM optical and NIR observations
  37. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  38. GRB 060211A: Further refined analysis of the Swift burst
  39. GRB060121: optical observations
  40. GRB060110: optical observations
  41. GRB060105: optical observations
  42. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  43. GRB 060211b: P60 Observations
  44. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  45. GRB 060206: SOAR Detections
  46. GRB 050826: Optical Afterglow and Host Galaxy
  47. GRB 060210: Further refined analysis of the Swift-BAT burst
  48. GRB 060211B: Swift/BAT refined analysis
  49. GRB060210: Swift/UVOT Upper Limits
  50. GRB 060211B: Swift-XRT Team refined analysis
  51. GRB060211b: optical observation
  52. GRB060211B: Swift/XRT position
  53. GRB 060210: Optical Observations
  54. GRB 060211A: Swift XRT Team Refined Analysis
  55. GRB060211: Faulkes North observation
  56. GRB 060211: ROTSE-III Optical Limits
  57. GRB 060210: Refined analysis of the Swift-BAT burst
  58. GRB060210: Swift XRT Refined Analysis
  59. GRB060206, optical observations
  60. GRB060210: Optical Observations
  61. GRB060210: Gemini absorption spectroscopy
  62. GRB060210: Early Optical Observations
  63. GRB060210:Faulkes Telescope North Afterglow Confirmation
  64. GRB 060206: Swift/UVOT Observations
  65. GRB060209: RTT150 optical observations
  66. GRB 060209 : TAROT optical observation
  67. GRB 060206: near-infrared observations (JK' imaging)
  68. GRB 060206: WSRT Radio Observations
  69. GRB 060203: Swift/UVOT upper limits
  70. GRB 060206: TTT Observations
  71. GRB 060206: More PROMPT Detections
  72. GRB 060121 : WIDGET Pre-trigger limit
  73. GRB 060206: Tenagra II Observations
  74. GRB 060206: PROMPT Detections
  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. GRB060206: SDSS Pre-Burst Observations
  87. GRB060206: Swift XRT Refined Analysis
  88. GRB060206: Liverpool Telescope observation
  89. GRB 060206: Spectroscopic Redshift
  90. GRB060206: P60 Optical Observations
  91. GRB 060206: KAIT observations
  92. GRB060206: Swift XRT Position
  93. GRB060206: SARA Detection
  94. GRB 060206: RAPTOR observations of afterglow candidate variability.
  95. GRB 060206: High redshift burst
  96. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  97. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  98. GRB060206: Optical afterglow
  99. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  100. GRB060203: WHT Z-band observations

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