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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"

36161 results found.

  1. GRB 060323 : WIDGET simultaneous optical observations
  2. GRB 060323: Early optical observation at Xinglong
  3. GRB060218, optical observations
  4. GRB 060322: Confirmation of Swift XRT afterglow
  5. GRB 060211A: optical observation
  6. GRB060323: optical limit
  7. GRB060211B: optical observation
  8. GRB060323: NOT optical observations
  9. GRB 060322: IAC80 optical observations
  10. GRB 060322: Swift XRT afterglow candidate
  11. GRB 060323: Swift/UVOT Observations
  12. GRB 060323: optical afterglow confirmed
  13. GRB060323: NOT observations
  14. GRB 060323: Optical Observations
  15. GRB 060323: Tautenburg OT candidate retraction
  16. GRB 060323: Refined analysis of the Swift-BAT burst
  17. GRB 060323: optical observations at TNG
  18. GRB 060323: Swift XRT refined analysis
  19. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  20. GRB 060323: Swift/XRT position
  21. GRB 060322: Refined analysis of the Swift-BAT burst
  22. GRB060323 - SDSS Pre-Burst Observations
  23. GRB 060323: Swift detection of a burst with a possible optical afterglow
  24. GRB 060322: Swift-BAT detection of a 200-sec burst
  25. GRB060219: optical observation
  26. GRB060206: optical observation
  27. GRB060218/SN2006aj: optical observations
  28. GRB 060218/SN 2006aj, LNA optical observation
  29. GRB060218: Refined photometric calibration of comparison stars
  30. GRB 060319: WHT K-band candidate afterglow
  31. GRB 060319: IAC-80 optical observations
  32. GRB060319: Swift XRT refined analysis
  33. GRB 060319: Re-analysis of TNG data
  34. GRB060319: MASTER limit
  35. GRB 060319: Swift-BAT refined analysis
  36. GRB 060319 optical observations at TNG
  37. GRB060319 : Liverpool Telescope optical limit
  38. GRB060319: MASTER optical observation
  39. GRB060319 - SDSS Pre-burst Observations
  40. GRB 060319: Swift detection of a burst
  41. GRB060313: Radio Observations
  42. GRB 060313: early afterglow NIR upper limits with REM
  43. IBAS Alert n. 3221: not a GRB
  44. Konus-Wind observation of GRB 060313
  45. GRB060313: SSO 40inch Observations
  46. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  47. GRB 060313: PROMPT Observations
  48. GRB 060313: Swift/UVOT Observations
  49. GRB060313:Gemini South Observations
  50. GRB 060313: Swift-XRT team refined analysis
  51. GRB060313: optical observations of the afterglow candidate
  52. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  53. GRB 060313, SMARTS optical counterpart?
  54. GRB 060313: Possible optical counterpart
  55. GRB 060313: Swift XRT position
  56. GRB 060313, SMARTS optical/IR observations
  57. GRB060313: optical and near infrared observations with REM
  58. GRB 060313: Swift-BAT detection of a bright short hard burst
  59. GRB060218: SARA Observations of SN2006aj
  60. GRB 060312: Refined analysis of the Swift-BAT burst
  61. GRB 060218/SN 2006aj, high resolution spectra
  62. GRB 060312: Swift XRT team refined analysis
  63. GRB060306: APO Ks-band Imaging Observations
  64. GRB 060312: ROTSE-III Optical Limits
  65. GRB 060312: Swift detection of a burst
  66. IBAS Alert n. 3218 : not a real GRB
  67. GRB 060306: SOAR Ks Observations
  68. Bright short hard GRB 060303: IPN localization and Konus spectrum
  69. GRB 060306: MAGNUM observations
  70. GRB060218: analysis of the XMM-Newton observation
  71. Swift/UVOT observations of GRB060306
  72. GRB 060306: Swift-BAT refined analysis
  73. GRB 060306: Swift-XRT team refined analysis
  74. GRB 060306: PROMPT Observations
  75. GRB 060306: Swift detection of a bright burst
  76. GRB 060218: RTT150 optical observations
  77. GRB060223b: optical limit
  78. GRB060218/SN 2006aj: optical observation in V
  79. GRB060218/SN 2006aj: optical observation
  80. GRB 060121: HST observations
  81. GRB 060218 : GMRT observation [Correction and Improvement]
  82. GRB 060223b: Swift/UVOT Upper Limits
  83. GRB 060218/SN 2006aj: K-380 optical observations
  84. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  85. GRB 060223B: Swift XRT possible afterglow
  86. GRB 060218/SN 2006aj: ABT observations
  87. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  88. GRB 060218 : Radio upper limits from GMRT
  89. GRB 060218/SN 2006aj: WIRO optical observations
  90. GRB 060218/SN 2006aj: RBO optical observations
  91. GRB 060204B: GETS early limit
  92. GRB 060218: Refined analysis of the radio afterglow
  93. GRB 060223A:Xinglong optical limits
  94. GRB 060223B: ART optical limits
  95. GRB 060223B: Swift-BAT refined analysis
  96. GRB 060223a: Swift/UVOT refined analysis
  97. GRB 060223: Swift XRT Team preliminary analysis
  98. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  99. GRB 060223B: Swift detection of a bright burst
  100. GRB 060223: Swift-BAT refined analysis

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