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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"

38579 results found.

  1. Swift-BAT detection of the bright and long GRB 050418
  2. GRB 050416: Mitsume optical observation
  3. GRB 050416 : optical observation at Xinglong observatory
  4. GRB 050416B: optical observations
  5. GRB 050416b: Swift-BAT refined analysis
  6. GRB 050416b: LCO observations
  7. GRB 050416b: LCO observations
  8. GRB050416B: IR observations
  9. GRB 050416: Swift/UVOT refined analysis
  10. Swift-BAT detection of GRB 050416b
  11. IBAS GRB Alert # 2463: not a GRB
  12. GRB050412: Radio Observations
  13. GRB 050416: Swift/UVOT detection of afterglow emission
  14. GRB050416: Maidanak optical observations
  15. GRB 050416: Swift-BAT refined analysis
  16. GRB 050416,optical observation
  17. GRB050416: P200 NIR Observations
  18. GRB 050416: Swift XRT Position
  19. GRB 050416: Radio observations
  20. Confirmation of OT for GRB050416
  21. GRB050416: P60 Afterglow Candidate
  22. Swift BAT/XRT Detection of GRB 050416
  23. GRB 050412: Subaru observations
  24. GRB 050408: RTT150 optical observations
  25. GRB050408: optical observation
  26. GRB 050412: PROMPT VRcIc Observations
  27. GRB 050408: Kuiper 1.5m observations
  28. GRB 050412: optical observations
  29. GRB 050408: refined XRT analysis, no jet break seen yet
  30. GRB 050412: early Swift XRT analysis results
  31. GRB 050412 : XingLong optical observation
  32. GRB 050412: Swift-BAT refined analysis
  33. GRB 050412: ANU 2.3m observations
  34. GRB 050412: Early Optical/Ultraviolet Observations with
  35. GRB 050408: SDSS Field Calibration
  36. GRB 050412: LCO Optical Observations
  37. GRB 050412: Optical observations
  38. GRB050412: P60 Observations
  39. GRB 050412: Swift XRT Position
  40. GRB050412: optical limit before and during GRB
  41. GRB 050412: LCO optical observations
  42. GRB050412: ROTSE-III Optical Limits
  43. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  44. GRB 050412: IR and Optical observations
  45. GRB 050412: IR Observations
  46. GRB050408: Radio Observations
  47. GRB050410: P60 Observations
  48. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  49. GRB 050410, optical observations
  50. GRB 050408: PROMPT VRcIc Observations
  51. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  52. GRB 050410 R band Optical Observations
  53. GRB 050410, optical observations
  54. GRB050410: Radio Observations
  55. GRB 050408: Swift XRT measurement of possible jet break
  56. GRB050410: MASTER optical observations
  57. GRB 050410: Early observations with Swift-UVOT
  58. Swift-BAT detection of GRB 050410
  59. GRB 050410: Swift XRT Position
  60. GRB 050408: Subaru Observations
  61. GRB 050408: WIDGET simultaneous optical observations
  62. GRB 050408: SOAR UBVRc Observations
  63. GRB 050408: Mercator Optical Observations
  64. GRB050408: Radio Observations
  65. GRB 050408: Swift XRT analysis
  66. GRB 050408, SMARTS optical/IR afterglow observations
  67. GRB 050408: Optical limit at 20 min after the burst
  68. GRB 050408, optical observations
  69. GRB050408: REM NIR and Optical observation
  70. GRB 050408: Moderate-resolution Gemini Spectroscopy
  71. GRB 050408,optical observation
  72. GRB 050408 Optical Observations
  73. GRB 050408: Emission and absorption redshift
  74. GRB 050408: Magellan astrometry and photometry
  75. GRB 050408: steepening of the optical decay
  76. GRB 050408: Optical afterglow confirmed
  77. GRB 050408: opitcal observation
  78. GRB 050408, optical observations
  79. GRB 050408: Swift XRT Position
  80. GRB 050408: ROTSE-III Optical Limits
  81. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  82. GRB050408: MASTER optical observations
  83. GRB050401: Radio Detection
  84. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  85. GRB 050406: Magellan optical observations
  86. GRB 050406: early Swift XRT analysis results
  87. GRB 050406 BAT refined analysis
  88. GRB 050406: Early observations with Swift-UVOT
  89. GRB 050406: Swift XRT Position
  90. Swift-BAT detection of GRB 050406
  91. Konus-Wind observation of GRB 050401
  92. GRB050401: Radio observation at 610 MHz with GMRT
  93. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  94. GRB 050401: VLT spectroscopic redshift
  95. GRB 050401 Optical Observations
  96. GRB 050401 BAT refined analysis
  97. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  98. GRB050401: TNG R-band observation
  99. GRB 050402A: IR Analysis
  100. GRB050402: XDSS counterpart

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