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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"

18363 results found.

  1. GRB050421
  2. GRB 050421: NIR observations
  3. GRB050421: P60 Observations
  4. GRB 050421: BOOTES-2 simultaneous optical observations
  5. GRB 050416b: Tentative Swift XRT Position
  6. GRB 050315: potential host galaxy
  7. GRB050326: analysis of the XMM-Newton observation
  8. GRB050418: Null Optical Observations
  9. GRB050416A, optical observations
  10. GRB 050416: Mitsume optical observation
  11. GRB050416B: IR observations
  12. GRB 050416: Swift/UVOT refined analysis
  13. GRB050412: Radio Observations
  14. GRB 050416: Swift/UVOT detection of afterglow emission
  15. GRB 050416,optical observation
  16. GRB050416: P200 NIR Observations
  17. GRB 050416: Radio observations
  18. Swift BAT/XRT Detection of GRB 050416
  19. GRB 050412: Subaru observations
  20. GRB050408: optical observation
  21. GRB 050408: Kuiper 1.5m observations
  22. GRB 050412: optical observations
  23. GRB 050412: Early Optical/Ultraviolet Observations with
  24. GRB 050408: SDSS Field Calibration
  25. GRB050412: P60 Observations
  26. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  27. GRB 050412: IR and Optical observations
  28. GRB 050412: IR Observations
  29. GRB050408: Radio Observations
  30. GRB050410: P60 Observations
  31. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  32. GRB 050408: PROMPT VRcIc Observations
  33. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  34. GRB050410: Radio Observations
  35. GRB 050408: Swift XRT measurement of possible jet break
  36. GRB050410: MASTER optical observations
  37. GRB 050410: Early observations with Swift-UVOT
  38. Swift-BAT detection of GRB 050410
  39. GRB 050408: Inconsistency of host galaxy identification
  40. GRB 050408: Subaru Observations
  41. GRB 050408: WIDGET simultaneous optical observations
  42. GRB 050408: SOAR UBVRc Observations
  43. GRB 050408: Properties of the Host Galaxy
  44. GRB050408: Radio Observations
  45. GRB050408: REM NIR and Optical observation
  46. GRB 050408,optical observation
  47. GRB 050408: Magellan astrometry and photometry
  48. GRB 050408: Optical afterglow confirmed
  49. GRB 050408: opitcal observation
  50. GRB 050408, optical observations
  51. GRB 050408: Swift XRT Position
  52. GRB050408: MASTER optical observations
  53. GRB050401: Radio Detection
  54. GRB 050406: Early observations with Swift-UVOT
  55. Swift-BAT detection of GRB 050406
  56. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  57. GRB050401: TNG R-band observation
  58. GRB 050402: Early observations with Swift-UVOT
  59. Swift Trigger 113225: P60 Observations
  60. GRB 050401: Optical afterglow confirmed
  61. Swift-BAT detection of GRB 050401
  62. GRB 050401: Prompt XRT position
  63. GRB050331: No Afterglow Detected
  64. GRB 050331: Swift UVOT Source
  65. GRB 050326: Early observations with Swift-UVOT
  66. GRB 050326 XMM-Newton observation
  67. GRB 050326: Swift XRT Position
  68. GRB050326: optical limit 33min before GRB
  69. GRB 050326 BAT refined analysis
  70. GRB050326: delayed XRT observation
  71. GRB050319: optical observation, March 20-22
  72. GRB050319: RTT150 Optical Observations
  73. GRB050319: VLA Observations
  74. GRB050319: radio observation
  75. GRB 050319: Swift-UVOT detection of the afterglow
  76. GRB050319: Radio Observations
  77. GRB 050319: NIR afterglow candidate
  78. GRB 050319:Near IR afterglow
  79. GRB050319,optical observation
  80. GRB 050318: Swift/UVOT detection of afterglow emission
  81. RXTE Observations of GRB050318
  82. GRB050223: analysis of the XMM-Newton observation
  83. GRB050316: MASTER before, simultanious and follow up optical
  84. GRB 050306: ROTSE-III early limits
  85. GRB050316: MASTER optical observations
  86. GRB 050315 I-band observations
  87. GRB050315: Radio afterglow
  88. GRB 050315: Early Observations with Swift/UVOT
  89. GRB 050306: Radio Observations
  90. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  91. GRB 050306: optical afterglow
  92. Swift-BAT trigger 107873: No Swift XRT counterpart
  93. GRB 050306: Confirmation of X-ray afterglow
  94. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  95. Swift 107873: P60 Optical Observations
  96. GRB 050306: R-band observations
  97. GRB 050306: REM optical-infrared observations
  98. GRB 050306: Possible X-ray Afterglow Position from the Swift
  99. GRB 050306: TAROT optical observations
  100. GRB 050306,optical observation

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