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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"

32569 results found.

  1. GRB050416a: Radio Detection
  2. GRB 050422: Swift-UVOT observation
  3. GRB 050422: Swift-BAT refined analysis
  4. GRB 050422: Swift XRT Position
  5. GRB 050421: NIR observations
  6. GRB 050416: Optical/NIR observations
  7. GRB 050421: SLOTIS observations
  8. GRB 050421: Further Analysis of IR imaging
  9. GRB050421: Radio Observations
  10. GRB050421: Radio Observations
  11. GRB 050421: Swift-UVOT observation
  12. GRB 050421: IR Observations
  13. GRB 050421: Swift-BAT refined analysis
  14. GRB 050421: ROTSE-III Optical Limits
  15. GRB 050421: NIR observations re-examination
  16. GRB050421
  17. GRB 050421: early Swift XRT analysis results
  18. GRB 050421: NIR observations
  19. GRB050421: P60 Observations
  20. GRB 050421: BOOTES-2 simultaneous optical observations
  21. GRB 050421: Optical observations at the INT
  22. Swift Detection of GRB050421
  23. GRB 050416b: Tentative Swift XRT Position
  24. GRB 050315: potential host galaxy
  25. GRB050418: Null Optical Observations
  26. GRB 050412: Chandra observations
  27. GRB050416A, optical observations
  28. GRB 050418: Swift-BAT refined analysis
  29. GRB 050416: Mitsume optical observation
  30. GRB 050416 : optical observation at Xinglong observatory
  31. GRB 050416B: optical observations
  32. GRB 050416b: Swift-BAT refined analysis
  33. GRB 050416b: LCO observations
  34. GRB 050416b: LCO observations
  35. GRB050416B: IR observations
  36. GRB 050416: Swift/UVOT refined analysis
  37. GRB050412: Radio Observations
  38. GRB 050416: Swift/UVOT detection of afterglow emission
  39. GRB050416: Refined Swift-XRT analysis
  40. GRB 050416: Swift-BAT refined analysis
  41. GRB 050416: ART observations
  42. GRB 050416: KAIT observations
  43. GRB050416: P200 NIR Observations
  44. GRB 050416: Swift XRT Position
  45. GRB 050416: Radio observations
  46. GRB 050412: Subaru observations
  47. GRB 050408: RTT150 optical observations
  48. GRB050408: optical observation
  49. GRB 050412: PROMPT VRcIc Observations
  50. GRB 050408: Kuiper 1.5m observations
  51. GRB 050412: optical limit
  52. GRB 050412: optical observations
  53. GRB 050408: refined XRT analysis, no jet break seen yet
  54. GRB 050412: early Swift XRT analysis results
  55. GRB 050412 : XingLong optical observation
  56. GRB 050412: Swift-BAT refined analysis
  57. GRB 050412: ANU 2.3m observations
  58. GRB 050412: Early Optical/Ultraviolet Observations with
  59. GRB 050412: retraction of UVOT transient report
  60. GRB 050412: Optical limit
  61. GRB 050412: LCO Optical Observations
  62. GRB 050412: Optical observations
  63. GRB050412: P60 Observations
  64. GRB 050412: Swift XRT Position
  65. GRB050412: optical limit before and during GRB
  66. GRB 050412: LCO optical observations
  67. GRB050412: ROTSE-III Optical Limits
  68. GRB050408: Radio Observations
  69. GRB 050401: Optical limit
  70. GRB 050408: Optical limit
  71. GRB050410: P60 Observations
  72. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  73. GRB 050410, optical observations
  74. GRB 050408: PROMPT VRcIc Observations
  75. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  76. GRB050410 : Null detection report
  77. GRB 050410, optical observations
  78. GRB050410: Radio Observations
  79. GRB 050410: Early observations with Swift-UVOT
  80. Swift-BAT detection of GRB 050410
  81. GRB 050408: Retraction of Proposed Host Galaxy
  82. GRB 050408: Inconsistency of host galaxy identification
  83. GRB 050408: Subaru Observations
  84. GRB 050408: WIDGET simultaneous optical observations
  85. GRB 050408: SOAR UBVRc Observations
  86. GRB 050408: Properties of the Host Galaxy
  87. GRB 050408: Mercator Optical Observations
  88. GRB050408: Radio Observations
  89. GRB 050408: Swift XRT analysis
  90. GRB 050408, SMARTS optical/IR afterglow observations
  91. GRB 050408: Optical limit at 20 min after the burst
  92. GRB 050408, optical observations
  93. GRB050408: REM NIR and Optical observation
  94. GRB 050408: Moderate-resolution Gemini Spectroscopy
  95. GRB 050408,optical observation
  96. GRB 050408 Optical Observations
  97. GRB 050408: Emission and absorption redshift
  98. GRB 050408: Mercator Optical Observations
  99. GRB 050408: Magellan astrometry and photometry
  100. GRB 050408: First Optical observations with TFOSC at the RTT150

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