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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"

28110 results found.

  1. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  2. GRB 070311: REM candidate afterglow
  3. GRB060901: Candidate optical afterglow
  4. GRB070309: Swift/XRT possible afterglow detection
  5. GRB 070125: Chandra X-ray Confirmation of Jet Break
  6. GRB 070306, optical observation
  7. GRB 070125: X-ray light curve analysis
  8. VLA observation of GRB 070306
  9. GRB 070306: NOT observations
  10. GRB 070306 Swift/UVOT refined analysis
  11. GRB070306: confirmation of near infrared afterglow
  12. GRB 070306: ART-3 early optical and near infrared constraints
  13. GRB 070306: IR observations and candidate afterglow
  14. GRB 070306: XRT Team Refined Analysis
  15. GRB 070306: Optical and IR observations with KANATA
  16. GRB 070306: Swift detection of a burst
  17. GRB 070223: NIR observations at WHT
  18. GRB070227: Swift-XRT refined analysis
  19. GRB 060605 new redshift
  20. GRB 070125, deep late-time optical observation
  21. VLA observation of GRB 070224
  22. GRB 070223: Optical Observations
  23. GRB 070227: Swift/UVOT Upper Limits
  24. GRB 070227: TAROT La Silla observatory optical observations
  25. GRB070227: possible X-ray afterglow detection
  26. GRB 070227: Swift detection of a burst in ground analysis
  27. GRB 920925C: optical afterglow candidate
  28. GRB 070224: Optical afterglow confirmation
  29. GRB 070224: Swift/UVOT Upper Limits
  30. GRB070224: Swift-XRT Astrometrically Corrected Position
  31. VLA observation of GRB 070223
  32. VLA observation of GRB 070220
  33. GRB 070224: WHT K-band imaging
  34. GRB070224: Gemini Imaging Observations
  35. GRB070224: Swift-XRT Refined Analysis
  36. GRB 070224: optical afterglow candidate
  37. GRB 070224: Swift detection of a burst
  38. GRB 070223: Optical observations
  39. GRB070223: Swift/UVOT refined analysis
  40. GRB 070223: Optical-IR observation with KANATA
  41. GRB 070223: Swift-XRT Refined Analysis
  42. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  43. GRB 070223: MDM Observations
  44. GRB070223: Swift burst
  45. Konus-Wind and Konus-A observations of GRB 070220
  46. GRB 070220: MITSuME Okayama Optical Observation
  47. GRB 070220: ART-3 Optical and NIR limits
  48. Swift/UVOT refined analysis of GRB070220
  49. GRB 070209: Swift XRT refined analysis
  50. GRB 070220: Swift-XRT Refined Analysis
  51. GRB 070220: Observation with the KANATA 1.5m telescope
  52. GRB 070219: Gemini Observations
  53. GRB 070220 : Faulkes Telescope North optical limit
  54. GRB 070220: Swift detection of a burst
  55. GRB 070219: XRT Refined Analysis
  56. GRB 070219: Swift/UVOT Upper limits
  57. GRB 070219: I-band observations
  58. GRB 070219: optical TNG observations
  59. GRB 070219: Liverpool Telescope Observations
  60. GRB 070219: Swift detection of a burst
  61. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  62. GRB 060927: PROMPT Observations
  63. GRB 070129: MDM I-band Detection
  64. GRB 070125: Break in Optical Decay
  65. GRB 070209: Swift XRT analysis
  66. GRB 070209: Swift detection of a short hard burst
  67. GRB 070208: Swift XRT refined analysis
  68. GRB 070208: RAPTOR detection of early afterglow onset
  69. GRB070208: Absorption and emission redshift from Gemini
  70. GRB 070208: MDM Optical Decay
  71. GRB 070208: Early IR detection and afterglow astrometry
  72. GRB 070208: Afterglow confirmation from P60
  73. GRB070208: Faulkes Telescope North Afterglow Identification
  74. GRB 070208: ROTSE-III Optical Limits
  75. GRB 070208: MDM Observations
  76. GRB 070208: Swift detection of a burst
  77. GRB 070125 detection with CARMA
  78. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  79. GRB 070129: afterglow confirmation
  80. GRB070124: Swift-XRT Follow-up Observation
  81. GRB070126: Swift-XRT Observation
  82. GRB 070129: Swift/UVOT Upper limits
  83. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  84. GRB 070125: optical observation
  85. GRB 070125: WSRT Radio Detection
  86. GRB070129: MITSuME optical observation
  87. Radio detection of GRB 070125
  88. GRB 070129, Swift-BAT refined analysis of a particularly long
  89. GRB 070129: Xinglong TNT optical Upper Limit
  90. GRB 070129: Swift-XRT Refined Analysis
  91. GRB 070129: VLT observations
  92. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  93. GRB 070129: Swift detection of a burst
  94. GRB 070126: Swift/UVOT refined analysis
  95. GRB 070125: further AAVSO optical observations
  96. GRB 070125: MITSuME Okayama optical observation
  97. GRB 070125: AAVSO optical observations
  98. GRB 070125: optical observations
  99. GRB 070126: VLT observations
  100. GRB070126: Swift-XRT possible detection of an afterglow

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