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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"

21526 results found.

  1. GRB 060323: Swift/UVOT Observations
  2. GRB 060323: optical afterglow confirmed
  3. GRB060323: NOT observations
  4. GRB 060323: Refined analysis of the Swift-BAT burst
  5. GRB 060323: optical observations at TNG
  6. GRB 060323: Swift XRT refined analysis
  7. GRB 060323: Swift/XRT position
  8. GRB 060322: Refined analysis of the Swift-BAT burst
  9. GRB060323 - SDSS Pre-Burst Observations
  10. GRB 060323: Swift detection of a burst with a possible optical afterglow
  11. GRB 060322: Swift-BAT detection of a 200-sec burst
  12. GRB060219: optical observation
  13. GRB060206: optical observation
  14. GRB 060319: WHT K-band candidate afterglow
  15. GRB 060319: IAC-80 optical observations
  16. GRB060319: Swift XRT refined analysis
  17. GRB060319: Swift/UVOT upper limits
  18. GRB060319: MASTER limit
  19. GRB 060319: Swift-BAT refined analysis
  20. GRB 060319 optical observations at TNG
  21. GRB060319 : Liverpool Telescope optical limit
  22. GRB060319: Swift/XRT position
  23. GRB 060319: Swift detection of a burst
  24. GRB 060313: early afterglow NIR upper limits with REM
  25. Konus-Wind observation of GRB 060313
  26. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  27. GRB 060313: Swift/UVOT Observations
  28. GRB 060313: Swift-XRT team refined analysis
  29. GRB060313: optical observations of the afterglow candidate
  30. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  31. GRB 060313: Swift XRT position
  32. GRB060313: optical and near infrared observations with REM
  33. GRB 060313: Swift-BAT detection of a bright short hard burst
  34. GRB060312: Swift UVOT observation
  35. GRB 060312: Refined analysis of the Swift-BAT burst
  36. GRB 060312: Swift XRT team refined analysis
  37. GRB060306: APO Ks-band Imaging Observations
  38. GRB 060312: ROTSE-III Optical Limits
  39. GRB 060312: Swift detection of a burst
  40. GRB 060306: SOAR Ks Observations
  41. Bright short hard GRB 060303: IPN localization and Konus spectrum
  42. GRB060219: Liverpool Telescope observations
  43. GRB 060306: MAGNUM observations
  44. GRB060218: analysis of the XMM-Newton observation
  45. Swift/UVOT observations of GRB060306
  46. GRB 060306: Swift-BAT refined analysis
  47. GRB 060306: Swift-XRT team refined analysis
  48. GRB 060306: Swift detection of a bright burst
  49. GRB060218: Ep,i - Eiso correlation
  50. GRB060223b: optical limit
  51. GRB 060223b: Swift/UVOT Upper Limits
  52. GRB 060223B: Swift XRT possible afterglow
  53. GRB 060223B: Swift-BAT refined analysis
  54. GRB 060223a: Swift/UVOT refined analysis
  55. GRB 060223: Swift XRT Team preliminary analysis
  56. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  57. GRB 060223B: Swift detection of a bright burst
  58. GRB 060223: Swift-BAT refined analysis
  59. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  60. GRB 060223: Swift detection of a burst
  61. GRB 060219: Swift-BAT refined analysis
  62. GRB 060218: Further refined analysis of the Swift-BAT burst
  63. GRB 060218: Likely an underluminous GRB
  64. GRB 060219: SDSS galaxy inside XRT error circle
  65. GRB060218: UV Detection and Light Curves
  66. GRB 060219: Swift/UVOT Upper Limits
  67. GRB 060219: Swift-XRT Team refined analysis
  68. GRB 051221B: Swift-XRT Team Refined Analysis
  69. GRB 060219: Partial refined analysis of the Swift-BAT burst
  70. GRB 060219: Swift-XRT position typo correction
  71. GRB 060219: Swift-XRT position
  72. GRB 060218: optical/nIR observations at La Palma
  73. GRB 060219: Swift-BAT detection of a weak burst
  74. Oddball GRB 060218, transient or GRB?
  75. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  76. Brightening of the Optical Counterpart of the Possible GRB 060218
  77. GRB 060218: MDM Observations
  78. GRB 060218: Pre-burst detection of a possible host galaxy
  79. GRB 060218A: ROTSE-III Possible Optical Flare
  80. GRB060218: Swift/XRT refined position of a possible burst
  81. Preliminary refined analysis of the Swift-BAT trigger 191157
  82. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  83. GRB 060211B: Swift/UVOT Upper Limits
  84. GRB 060218: Swift XRT Position
  85. GRB 060218: Swift-BAT detection of a possible burst
  86. GRB 060213: optical afterglow not confirmed
  87. Swift UVOT observations of GRB060213
  88. GRB 060213: optical afterglow candidate
  89. GRB060213: Swift XRT observations and possible afterglow candidate
  90. GRB 060211b: WIRO NIR Observations
  91. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  92. GRB 060213: IPN localization
  93. GRB 060211a: WIRO NIR Observations
  94. GRB060211B: REM optical and NIR observations
  95. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  96. GRB 060211A: Further refined analysis of the Swift burst
  97. GRB060121: optical observations
  98. GRB060105: optical observations
  99. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  100. GRB 060211b: P60 Observations

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