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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"

37216 results found.

  1. GRB060403: Swift XRT refined position
  2. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  3. GRB 060403: Swift detection of a burst
  4. GRB060331: Swift/UVOT upper limits
  5. HETE Trigger 4043: ROTSE-III Optical Limits
  6. GRB 060322: LNA optical limit
  7. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  8. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  9. GRB 060323 : WIDGET simultaneous optical observations
  10. GRB 060323: Early optical observation at Xinglong
  11. GRB060218, optical observations
  12. GRB 060322: Confirmation of Swift XRT afterglow
  13. GRB 060211A: optical observation
  14. GRB060323: optical limit
  15. GRB060211B: optical observation
  16. GRB060323: NOT optical observations
  17. GRB 060322: IAC80 optical observations
  18. GRB 060322: Swift XRT afterglow candidate
  19. GRB 060323: Swift/UVOT Observations
  20. GRB 060323: optical afterglow confirmed
  21. GRB060323: NOT observations
  22. GRB 060323: Optical Observations
  23. GRB 060323: Tautenburg OT candidate retraction
  24. GRB 060323: Refined analysis of the Swift-BAT burst
  25. GRB 060323: optical observations at TNG
  26. GRB 060323: Swift XRT refined analysis
  27. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  28. GRB 060323: Swift/XRT position
  29. GRB 060322: Refined analysis of the Swift-BAT burst
  30. GRB060323 - SDSS Pre-Burst Observations
  31. GRB 060323: Swift detection of a burst with a possible optical afterglow
  32. GRB 060322: Swift-BAT detection of a 200-sec burst
  33. GRB060219: optical observation
  34. GRB060206: optical observation
  35. GRB060218/SN2006aj: optical observations
  36. GRB 060218/SN 2006aj, LNA optical observation
  37. GRB060218: Refined photometric calibration of comparison stars
  38. GRB 060319: WHT K-band candidate afterglow
  39. GRB 060319: IAC-80 optical observations
  40. GRB060319: Swift XRT refined analysis
  41. GRB 060319: Re-analysis of TNG data
  42. GRB060319: MASTER limit
  43. GRB 060319: Swift-BAT refined analysis
  44. GRB 060319 optical observations at TNG
  45. GRB060319 : Liverpool Telescope optical limit
  46. GRB060319: MASTER optical observation
  47. GRB060319 - SDSS Pre-burst Observations
  48. GRB 060319: Swift detection of a burst
  49. GRB060313: Radio Observations
  50. GRB 060313: early afterglow NIR upper limits with REM
  51. IBAS Alert n. 3221: not a GRB
  52. Konus-Wind observation of GRB 060313
  53. GRB060313: SSO 40inch Observations
  54. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  55. GRB 060313: PROMPT Observations
  56. GRB 060313: Swift/UVOT Observations
  57. GRB060313:Gemini South Observations
  58. GRB 060313: Swift-XRT team refined analysis
  59. GRB060313: optical observations of the afterglow candidate
  60. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  61. GRB 060313, SMARTS optical counterpart?
  62. GRB 060313: Possible optical counterpart
  63. GRB 060313: Swift XRT position
  64. GRB 060313, SMARTS optical/IR observations
  65. GRB060313: optical and near infrared observations with REM
  66. GRB 060313: Swift-BAT detection of a bright short hard burst
  67. GRB060218: SARA Observations of SN2006aj
  68. GRB 060312: Refined analysis of the Swift-BAT burst
  69. GRB 060218/SN 2006aj, high resolution spectra
  70. GRB 060312: Swift XRT team refined analysis
  71. GRB060306: APO Ks-band Imaging Observations
  72. GRB 060312: ROTSE-III Optical Limits
  73. GRB 060312: Swift detection of a burst
  74. IBAS Alert n. 3218 : not a real GRB
  75. GRB 060306: SOAR Ks Observations
  76. Bright short hard GRB 060303: IPN localization and Konus spectrum
  77. GRB060219: Liverpool Telescope observations
  78. GRB 060306: MAGNUM observations
  79. GRB060218: analysis of the XMM-Newton observation
  80. Swift/UVOT observations of GRB060306
  81. GRB 060306: Swift-BAT refined analysis
  82. GRB 060306: Swift-XRT team refined analysis
  83. GRB 060306: PROMPT Observations
  84. GRB 060306: Swift detection of a bright burst
  85. GRB 060218: RTT150 optical observations
  86. GRB060218: Ep,i - Eiso correlation
  87. GRB060223b: optical limit
  88. GRB060218/SN 2006aj: optical observation in V
  89. GRB060218/SN 2006aj: optical observation
  90. GRB 060121: HST observations
  91. GRB 060218 : GMRT observation [Correction and Improvement]
  92. GRB 060223b: Swift/UVOT Upper Limits
  93. GRB 060218/SN 2006aj: K-380 optical observations
  94. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  95. GRB 060223B: Swift XRT possible afterglow
  96. GRB 060218/SN 2006aj: ABT observations
  97. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  98. GRB 060218 : Radio upper limits from GMRT
  99. GRB 060218/SN 2006aj: WIRO optical observations
  100. GRB 060218/SN 2006aj: RBO optical observations

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