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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"

39364 results found.

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