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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"

32723 results found.

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

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