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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"

37220 results found.

  1. GRB060403: XRT refined analysis
  2. GRB 060403: Swift/UVOT upper limits
  3. SGR 1900+14: BAT observations
  4. GRB 060403: Refined analysis of the Swift-BAT burst
  5. GRB060403: Swift XRT refined position
  6. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  7. GRB 060403: Swift detection of a burst
  8. GRB060331: Swift/UVOT upper limits
  9. HETE Trigger 4043: ROTSE-III Optical Limits
  10. GRB 060322: LNA optical limit
  11. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  12. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  13. GRB 060323 : WIDGET simultaneous optical observations
  14. GRB 060323: Early optical observation at Xinglong
  15. GRB060218, optical observations
  16. GRB 060322: Confirmation of Swift XRT afterglow
  17. GRB 060211A: optical observation
  18. GRB060323: optical limit
  19. GRB060211B: optical observation
  20. GRB060323: NOT optical observations
  21. GRB 060322: IAC80 optical observations
  22. GRB 060322: Swift XRT afterglow candidate
  23. GRB 060323: Swift/UVOT Observations
  24. GRB 060323: optical afterglow confirmed
  25. GRB060323: NOT observations
  26. GRB 060323: Optical Observations
  27. GRB 060323: Tautenburg OT candidate retraction
  28. GRB 060323: Refined analysis of the Swift-BAT burst
  29. GRB 060323: optical observations at TNG
  30. GRB 060323: Swift XRT refined analysis
  31. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  32. GRB 060323: Swift/XRT position
  33. GRB 060322: Refined analysis of the Swift-BAT burst
  34. GRB060323 - SDSS Pre-Burst Observations
  35. GRB 060323: Swift detection of a burst with a possible optical afterglow
  36. GRB 060322: Swift-BAT detection of a 200-sec burst
  37. GRB060219: optical observation
  38. GRB060206: optical observation
  39. GRB060218/SN2006aj: optical observations
  40. GRB 060218/SN 2006aj, LNA optical observation
  41. GRB060218: Refined photometric calibration of comparison stars
  42. GRB 060319: WHT K-band candidate afterglow
  43. GRB 060319: IAC-80 optical observations
  44. GRB060319: Swift XRT refined analysis
  45. GRB 060319: Re-analysis of TNG data
  46. GRB060319: MASTER limit
  47. GRB 060319: Swift-BAT refined analysis
  48. GRB 060319 optical observations at TNG
  49. GRB060319 : Liverpool Telescope optical limit
  50. GRB060319: MASTER optical observation
  51. GRB060319 - SDSS Pre-burst Observations
  52. GRB 060319: Swift detection of a burst
  53. GRB060313: Radio Observations
  54. GRB 060313: early afterglow NIR upper limits with REM
  55. IBAS Alert n. 3221: not a GRB
  56. Konus-Wind observation of GRB 060313
  57. GRB060313: SSO 40inch Observations
  58. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  59. GRB 060313: PROMPT Observations
  60. GRB 060313: Swift/UVOT Observations
  61. GRB060313:Gemini South Observations
  62. GRB 060313: Swift-XRT team refined analysis
  63. GRB060313: optical observations of the afterglow candidate
  64. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  65. GRB 060313, SMARTS optical counterpart?
  66. GRB 060313: Possible optical counterpart
  67. GRB 060313: Swift XRT position
  68. GRB 060313, SMARTS optical/IR observations
  69. GRB060313: optical and near infrared observations with REM
  70. GRB 060313: Swift-BAT detection of a bright short hard burst
  71. GRB060218: SARA Observations of SN2006aj
  72. GRB 060312: Refined analysis of the Swift-BAT burst
  73. GRB 060218/SN 2006aj, high resolution spectra
  74. GRB 060312: Swift XRT team refined analysis
  75. GRB060306: APO Ks-band Imaging Observations
  76. GRB 060312: ROTSE-III Optical Limits
  77. GRB 060312: Swift detection of a burst
  78. IBAS Alert n. 3218 : not a real GRB
  79. GRB 060306: SOAR Ks Observations
  80. Bright short hard GRB 060303: IPN localization and Konus spectrum
  81. GRB060219: Liverpool Telescope observations
  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. GRB060218: Ep,i - Eiso correlation
  91. GRB060223b: optical limit
  92. GRB060218/SN 2006aj: optical observation in V
  93. GRB060218/SN 2006aj: optical observation
  94. GRB 060121: HST observations
  95. GRB 060218 : GMRT observation [Correction and Improvement]
  96. GRB 060223b: Swift/UVOT Upper Limits
  97. GRB 060218/SN 2006aj: K-380 optical observations
  98. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  99. GRB 060223B: Swift XRT possible afterglow
  100. GRB 060218/SN 2006aj: ABT observations

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