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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"

32549 results found.

  1. GRB 050421: Optical observations at the INT
  2. Swift Detection of GRB050421
  3. GRB 050416b: Tentative Swift XRT Position
  4. GRB 050315: potential host galaxy
  5. GRB050418: Null Optical Observations
  6. GRB 050412: Chandra observations
  7. GRB050416A, optical observations
  8. GRB 050418: Swift-BAT refined analysis
  9. GRB 050416: Mitsume optical observation
  10. GRB 050416 : optical observation at Xinglong observatory
  11. GRB 050416B: optical observations
  12. GRB 050416b: Swift-BAT refined analysis
  13. GRB 050416b: LCO observations
  14. GRB 050416b: LCO observations
  15. GRB050416B: IR observations
  16. GRB 050416: Swift/UVOT refined analysis
  17. GRB050412: Radio Observations
  18. GRB 050416: Swift/UVOT detection of afterglow emission
  19. GRB050416: Refined Swift-XRT analysis
  20. GRB 050416: Swift-BAT refined analysis
  21. GRB 050416: ART observations
  22. GRB 050416: KAIT observations
  23. GRB050416: P200 NIR Observations
  24. GRB 050416: Swift XRT Position
  25. GRB 050416: Radio observations
  26. GRB 050412: Subaru observations
  27. GRB 050408: RTT150 optical observations
  28. GRB050408: optical observation
  29. GRB 050412: PROMPT VRcIc Observations
  30. GRB 050408: Kuiper 1.5m observations
  31. GRB 050412: optical limit
  32. GRB 050412: optical observations
  33. GRB 050408: refined XRT analysis, no jet break seen yet
  34. GRB 050412: early Swift XRT analysis results
  35. GRB 050412 : XingLong optical observation
  36. GRB 050412: Swift-BAT refined analysis
  37. GRB 050412: ANU 2.3m observations
  38. GRB 050412: Early Optical/Ultraviolet Observations with
  39. GRB 050412: retraction of UVOT transient report
  40. GRB 050412: Optical limit
  41. GRB 050412: LCO Optical Observations
  42. GRB 050412: Optical observations
  43. GRB050412: P60 Observations
  44. GRB 050412: Swift XRT Position
  45. GRB050412: optical limit before and during GRB
  46. GRB 050412: LCO optical observations
  47. GRB050412: ROTSE-III Optical Limits
  48. GRB050408: Radio Observations
  49. GRB 050401: Optical limit
  50. GRB 050408: Optical limit
  51. GRB050410: P60 Observations
  52. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  53. GRB 050410, optical observations
  54. GRB 050408: PROMPT VRcIc Observations
  55. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  56. GRB050410 : Null detection report
  57. GRB 050410, optical observations
  58. GRB050410: Radio Observations
  59. GRB 050410: Early observations with Swift-UVOT
  60. Swift-BAT detection of GRB 050410
  61. GRB 050408: Retraction of Proposed Host Galaxy
  62. GRB 050408: Inconsistency of host galaxy identification
  63. GRB 050408: Subaru Observations
  64. GRB 050408: WIDGET simultaneous optical observations
  65. GRB 050408: SOAR UBVRc Observations
  66. GRB 050408: Properties of the Host Galaxy
  67. GRB 050408: Mercator Optical Observations
  68. GRB050408: Radio Observations
  69. GRB 050408: Swift XRT analysis
  70. GRB 050408, SMARTS optical/IR afterglow observations
  71. GRB 050408: Optical limit at 20 min after the burst
  72. GRB 050408, optical observations
  73. GRB050408: REM NIR and Optical observation
  74. GRB 050408: Moderate-resolution Gemini Spectroscopy
  75. GRB 050408,optical observation
  76. GRB 050408 Optical Observations
  77. GRB 050408: Emission and absorption redshift
  78. GRB 050408: Mercator Optical Observations
  79. GRB 050408: Magellan astrometry and photometry
  80. GRB 050408: First Optical observations with TFOSC at the RTT150
  81. GRB 050408: steepening of the optical decay
  82. GRB 050408: Optical afterglow confirmed
  83. GRB 050408: opitcal observation
  84. GRB 050408, optical observations
  85. GRB 050408 optical candidate
  86. GRB 050408: Swift XRT Position
  87. GRB 050408: ROTSE-III Optical Limits
  88. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  89. GRB050401: Radio Detection
  90. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  91. GRB 050406: Magellan optical observations
  92. GRB 050406: early Swift XRT analysis results
  93. GRB 050406 BAT refined analysis
  94. GRB 050406: Early observations with Swift-UVOT
  95. GRB 050406: Swift XRT Position
  96. Konus-Wind observation of GRB 050401
  97. GRB050401: Radio observation at 610 MHz with GMRT
  98. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  99. GRB 050401: VLT spectroscopic redshift
  100. GRB 050401 Optical Observations

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