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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"

37574 results found.

  1. GRB 060413: Watcher UBVR observations
  2. GRB 060413: XRT refined analysis
  3. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  4. GRB 060413: Swift detection of a burst
  5. GRB060403: optical observations
  6. GRB 060403 Optical observations
  7. GRB 060403: MITSuME optical observation
  8. GRB060403: XRT refined analysis
  9. GRB 060403: Swift/UVOT upper limits
  10. GRB 060403: Refined analysis of the Swift-BAT burst
  11. GRB 060403: Swift detection of a burst
  12. GRB 060322: LNA optical limit
  13. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  14. GRB 060323 : WIDGET simultaneous optical observations
  15. GRB 060323: Early optical observation at Xinglong
  16. GRB060218, optical observations
  17. GRB 060322: Confirmation of Swift XRT afterglow
  18. GRB 060211A: optical observation
  19. GRB060323: optical limit
  20. GRB060211B: optical observation
  21. GRB060323: NOT optical observations
  22. GRB 060322: IAC80 optical observations
  23. GRB 060322: Swift XRT afterglow candidate
  24. GRB 060323: Swift/UVOT Observations
  25. GRB 060323: optical afterglow confirmed
  26. GRB060323: NOT observations
  27. GRB 060323: Optical Observations
  28. GRB 060323: Tautenburg OT candidate retraction
  29. GRB 060323: Refined analysis of the Swift-BAT burst
  30. GRB 060323: optical observations at TNG
  31. GRB 060323: Swift XRT refined analysis
  32. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  33. GRB 060323: Swift/XRT position
  34. GRB 060322: Refined analysis of the Swift-BAT burst
  35. GRB060323 - SDSS Pre-Burst Observations
  36. GRB 060323: Swift detection of a burst with a possible optical afterglow
  37. GRB 060322: Swift-BAT detection of a 200-sec burst
  38. GRB060219: optical observation
  39. GRB060206: optical observation
  40. GRB060218/SN2006aj: optical observations
  41. GRB 060218/SN 2006aj, LNA optical observation
  42. GRB060218: Refined photometric calibration of comparison stars
  43. GRB 060319: WHT K-band candidate afterglow
  44. GRB 060319: IAC-80 optical observations
  45. GRB060319: Swift XRT refined analysis
  46. GRB 060319: Re-analysis of TNG data
  47. GRB060319: MASTER limit
  48. GRB 060319: Swift-BAT refined analysis
  49. GRB 060319 optical observations at TNG
  50. GRB060319 : Liverpool Telescope optical limit
  51. GRB060319: MASTER optical observation
  52. GRB060319 - SDSS Pre-burst Observations
  53. GRB 060319: Swift detection of a burst
  54. GRB060313: Radio Observations
  55. GRB 060313: early afterglow NIR upper limits with REM
  56. IBAS Alert n. 3221: not a GRB
  57. Konus-Wind observation of GRB 060313
  58. GRB060313: SSO 40inch Observations
  59. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  60. GRB 060313: PROMPT Observations
  61. GRB 060313: Swift/UVOT Observations
  62. GRB060313:Gemini South Observations
  63. GRB 060313: Swift-XRT team refined analysis
  64. GRB060313: optical observations of the afterglow candidate
  65. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  66. GRB 060313, SMARTS optical counterpart?
  67. GRB 060313: Possible optical counterpart
  68. GRB 060313: Swift XRT position
  69. GRB 060313, SMARTS optical/IR observations
  70. GRB060313: optical and near infrared observations with REM
  71. GRB 060313: Swift-BAT detection of a bright short hard burst
  72. GRB060218: SARA Observations of SN2006aj
  73. GRB 060312: Refined analysis of the Swift-BAT burst
  74. GRB 060218/SN 2006aj, high resolution spectra
  75. GRB 060312: Swift XRT team refined analysis
  76. GRB060306: APO Ks-band Imaging Observations
  77. GRB 060312: ROTSE-III Optical Limits
  78. GRB 060312: Swift detection of a burst
  79. IBAS Alert n. 3218 : not a real GRB
  80. GRB 060306: SOAR Ks Observations
  81. Bright short hard GRB 060303: IPN localization and Konus spectrum
  82. GRB 060306: MAGNUM observations
  83. GRB060218: analysis of the XMM-Newton observation
  84. Swift/UVOT observations of GRB060306
  85. GRB 060306: Swift-BAT refined analysis
  86. GRB 060306: Swift-XRT team refined analysis
  87. GRB 060306: PROMPT Observations
  88. GRB 060306: Swift detection of a bright burst
  89. GRB 060218: RTT150 optical observations
  90. GRB060223b: optical limit
  91. GRB060218/SN 2006aj: optical observation in V
  92. GRB060218/SN 2006aj: optical observation
  93. GRB 060121: HST observations
  94. GRB 060218 : GMRT observation [Correction and Improvement]
  95. GRB 060223b: Swift/UVOT Upper Limits
  96. GRB 060218/SN 2006aj: K-380 optical observations
  97. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  98. GRB 060223B: Swift XRT possible afterglow
  99. GRB 060218/SN 2006aj: ABT observations
  100. GRB 060218/SN 2006aj: REM optical and near-infrared observations

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