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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"

37581 results found.

  1. GRB 060418, SMARTS optical/IR afterglow observations
  2. GRB060418: Magellan/MIKE Spectroscopic Redshift
  3. GRB060418 : LT optical afterglow observation
  4. GRB 060418: REM candidate afterglow
  5. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  6. GRB 060413: REM NIR Observations
  7. GRB 060413: Refined analysis of the Swift-BAT burst
  8. GRB 060413: Watcher UBVR observations
  9. GRB 060413: XRT refined analysis
  10. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  11. GRB 060413: Swift detection of a burst
  12. GRB060403: optical observations
  13. GRB 060403 Optical observations
  14. GRB 060403: MITSuME optical observation
  15. GRB060403: XRT refined analysis
  16. GRB 060403: Swift/UVOT upper limits
  17. GRB 060403: Refined analysis of the Swift-BAT burst
  18. GRB 060403: Swift detection of a burst
  19. GRB 060322: LNA optical limit
  20. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  21. GRB 060323 : WIDGET simultaneous optical observations
  22. GRB 060323: Early optical observation at Xinglong
  23. GRB060218, optical observations
  24. GRB 060322: Confirmation of Swift XRT afterglow
  25. GRB 060211A: optical observation
  26. GRB060323: optical limit
  27. GRB060211B: optical observation
  28. GRB060323: NOT optical observations
  29. GRB 060322: IAC80 optical observations
  30. GRB 060322: Swift XRT afterglow candidate
  31. GRB 060323: Swift/UVOT Observations
  32. GRB 060323: optical afterglow confirmed
  33. GRB060323: NOT observations
  34. GRB 060323: Optical Observations
  35. GRB 060323: Tautenburg OT candidate retraction
  36. GRB 060323: Refined analysis of the Swift-BAT burst
  37. GRB 060323: optical observations at TNG
  38. GRB 060323: Swift XRT refined analysis
  39. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  40. GRB 060323: Swift/XRT position
  41. GRB 060322: Refined analysis of the Swift-BAT burst
  42. GRB060323 - SDSS Pre-Burst Observations
  43. GRB 060323: Swift detection of a burst with a possible optical afterglow
  44. GRB 060322: Swift-BAT detection of a 200-sec burst
  45. GRB060219: optical observation
  46. GRB060206: optical observation
  47. GRB060218/SN2006aj: optical observations
  48. GRB 060218/SN 2006aj, LNA optical observation
  49. GRB060218: Refined photometric calibration of comparison stars
  50. GRB 060319: WHT K-band candidate afterglow
  51. GRB 060319: IAC-80 optical observations
  52. GRB060319: Swift XRT refined analysis
  53. GRB 060319: Re-analysis of TNG data
  54. GRB060319: MASTER limit
  55. GRB 060319: Swift-BAT refined analysis
  56. GRB 060319 optical observations at TNG
  57. GRB060319 : Liverpool Telescope optical limit
  58. GRB060319: MASTER optical observation
  59. GRB060319 - SDSS Pre-burst Observations
  60. GRB 060319: Swift detection of a burst
  61. GRB060313: Radio Observations
  62. GRB 060313: early afterglow NIR upper limits with REM
  63. IBAS Alert n. 3221: not a GRB
  64. Konus-Wind observation of GRB 060313
  65. GRB060313: SSO 40inch Observations
  66. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  67. GRB 060313: PROMPT Observations
  68. GRB 060313: Swift/UVOT Observations
  69. GRB060313:Gemini South Observations
  70. GRB 060313: Swift-XRT team refined analysis
  71. GRB060313: optical observations of the afterglow candidate
  72. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  73. GRB 060313, SMARTS optical counterpart?
  74. GRB 060313: Possible optical counterpart
  75. GRB 060313: Swift XRT position
  76. GRB 060313, SMARTS optical/IR observations
  77. GRB060313: optical and near infrared observations with REM
  78. GRB 060313: Swift-BAT detection of a bright short hard burst
  79. GRB060218: SARA Observations of SN2006aj
  80. GRB 060312: Refined analysis of the Swift-BAT burst
  81. GRB 060218/SN 2006aj, high resolution spectra
  82. GRB 060312: Swift XRT team refined analysis
  83. GRB060306: APO Ks-band Imaging Observations
  84. GRB 060312: ROTSE-III Optical Limits
  85. GRB 060312: Swift detection of a burst
  86. IBAS Alert n. 3218 : not a real GRB
  87. GRB 060306: SOAR Ks Observations
  88. Bright short hard GRB 060303: IPN localization and Konus spectrum
  89. GRB 060306: MAGNUM observations
  90. GRB060218: analysis of the XMM-Newton observation
  91. Swift/UVOT observations of GRB060306
  92. GRB 060306: Swift-BAT refined analysis
  93. GRB 060306: Swift-XRT team refined analysis
  94. GRB 060306: PROMPT Observations
  95. GRB 060306: Swift detection of a bright burst
  96. GRB 060218: RTT150 optical observations
  97. GRB060223b: optical limit
  98. GRB060218/SN 2006aj: optical observation in V
  99. GRB060218/SN 2006aj: optical observation
  100. GRB 060121: HST observations

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