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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"

32725 results found.

  1. GRB 050416: Radio observations
  2. GRB 050412: Subaru observations
  3. GRB 050408: RTT150 optical observations
  4. GRB050408: optical observation
  5. GRB 050412: PROMPT VRcIc Observations
  6. GRB 050408: Kuiper 1.5m observations
  7. GRB 050412: optical limit
  8. GRB 050412: optical observations
  9. GRB 050408: refined XRT analysis, no jet break seen yet
  10. GRB 050412: early Swift XRT analysis results
  11. GRB 050412 : XingLong optical observation
  12. GRB 050412: Swift-BAT refined analysis
  13. GRB 050412: ANU 2.3m observations
  14. GRB 050412: Early Optical/Ultraviolet Observations with
  15. GRB 050412: retraction of UVOT transient report
  16. GRB 050412: Optical limit
  17. GRB 050412: LCO Optical Observations
  18. GRB 050412: Optical observations
  19. GRB050412: P60 Observations
  20. GRB 050412: Swift XRT Position
  21. GRB050412: optical limit before and during GRB
  22. GRB 050412: LCO optical observations
  23. GRB050412: ROTSE-III Optical Limits
  24. GRB050408: Radio Observations
  25. GRB 050401: Optical limit
  26. GRB 050408: Optical limit
  27. GRB050410: P60 Observations
  28. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  29. GRB 050410, optical observations
  30. GRB 050408: PROMPT VRcIc Observations
  31. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  32. GRB050410 : Null detection report
  33. GRB 050410, optical observations
  34. GRB050410: Radio Observations
  35. GRB 050410: Early observations with Swift-UVOT
  36. Swift-BAT detection of GRB 050410
  37. GRB 050408: Retraction of Proposed Host Galaxy
  38. GRB 050408: Inconsistency of host galaxy identification
  39. GRB 050408: Subaru Observations
  40. GRB 050408: WIDGET simultaneous optical observations
  41. GRB 050408: SOAR UBVRc Observations
  42. GRB 050408: Properties of the Host Galaxy
  43. GRB 050408: Mercator Optical Observations
  44. GRB050408: Radio Observations
  45. GRB 050408: Swift XRT analysis
  46. GRB 050408, SMARTS optical/IR afterglow observations
  47. GRB 050408: Optical limit at 20 min after the burst
  48. GRB 050408, optical observations
  49. GRB050408: REM NIR and Optical observation
  50. GRB 050408: Moderate-resolution Gemini Spectroscopy
  51. GRB 050408,optical observation
  52. GRB 050408 Optical Observations
  53. GRB 050408: Emission and absorption redshift
  54. GRB 050408: Mercator Optical Observations
  55. GRB 050408: Magellan astrometry and photometry
  56. GRB 050408: First Optical observations with TFOSC at the RTT150
  57. GRB 050408: steepening of the optical decay
  58. GRB 050408: Optical afterglow confirmed
  59. GRB 050408: opitcal observation
  60. GRB 050408, optical observations
  61. GRB 050408 optical candidate
  62. GRB 050408: Swift XRT Position
  63. GRB 050408: ROTSE-III Optical Limits
  64. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  65. GRB050401: Radio Detection
  66. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  67. GRB 050406: Magellan optical observations
  68. GRB 050406: early Swift XRT analysis results
  69. GRB 050406 BAT refined analysis
  70. GRB 050406: Early observations with Swift-UVOT
  71. GRB 050406: Swift XRT Position
  72. Konus-Wind observation of GRB 050401
  73. GRB050401: Radio observation at 610 MHz with GMRT
  74. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  75. GRB 050401: VLT spectroscopic redshift
  76. GRB 050401 Optical Observations
  77. GRB050401: Maidanak optical observation
  78. GRB 050401 BAT refined analysis
  79. GRB050401: TNG R-band observation
  80. GRB 050402A: IR Analysis
  81. GRB050402: XDSS counterpart
  82. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  83. GRB 050401: Optical afterglow confirmed
  84. Swift-BAT detection of GRB 050401
  85. Retraction of three Swift GRB triggers
  86. GRB050331: No Afterglow Detected
  87. Swift-BAT detection of GRB 050331b
  88. GRB 050331: Swift UVOT Source
  89. Swift-BAT detection of GRB 050331
  90. Swift Data Publicly Available Starting April 5, 2005
  91. GRB050319: radio observation
  92. Konus-Wind observation of GRB 050326
  93. GRB050326: optical limit
  94. GRB 050326: Early observations with Swift-UVOT
  95. GRB 050326 XMM-Newton observation
  96. GRB 050326 : Planned XMM-Newton observation
  97. GRB 050326: Swift XRT Position
  98. GRB050326: optical limit 33min before GRB
  99. GRB 050326 BAT refined analysis
  100. GRB050326: delayed XRT observation

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