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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"

32707 results found.

  1. GRB050412: P60 Observations
  2. GRB 050412: Swift XRT Position
  3. GRB050412: optical limit before and during GRB
  4. GRB 050412: LCO optical observations
  5. GRB050412: ROTSE-III Optical Limits
  6. GRB050408: Radio Observations
  7. GRB 050401: Optical limit
  8. GRB 050408: Optical limit
  9. GRB050410: P60 Observations
  10. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  11. GRB 050410, optical observations
  12. GRB 050408: PROMPT VRcIc Observations
  13. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  14. GRB050410 : Null detection report
  15. GRB 050410, optical observations
  16. GRB050410: Radio Observations
  17. GRB 050410: Early observations with Swift-UVOT
  18. Swift-BAT detection of GRB 050410
  19. GRB 050408: Retraction of Proposed Host Galaxy
  20. GRB 050408: Inconsistency of host galaxy identification
  21. GRB 050408: Subaru Observations
  22. GRB 050408: WIDGET simultaneous optical observations
  23. GRB 050408: SOAR UBVRc Observations
  24. GRB 050408: Properties of the Host Galaxy
  25. GRB 050408: Mercator Optical Observations
  26. GRB050408: Radio Observations
  27. GRB 050408: Swift XRT analysis
  28. GRB 050408, SMARTS optical/IR afterglow observations
  29. GRB 050408: Optical limit at 20 min after the burst
  30. GRB 050408, optical observations
  31. GRB050408: REM NIR and Optical observation
  32. GRB 050408: Moderate-resolution Gemini Spectroscopy
  33. GRB 050408,optical observation
  34. GRB 050408 Optical Observations
  35. GRB 050408: Emission and absorption redshift
  36. GRB 050408: Mercator Optical Observations
  37. GRB 050408: Magellan astrometry and photometry
  38. GRB 050408: First Optical observations with TFOSC at the RTT150
  39. GRB 050408: steepening of the optical decay
  40. GRB 050408: Optical afterglow confirmed
  41. GRB 050408: opitcal observation
  42. GRB 050408, optical observations
  43. GRB 050408 optical candidate
  44. GRB 050408: Swift XRT Position
  45. GRB 050408: ROTSE-III Optical Limits
  46. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  47. GRB050401: Radio Detection
  48. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  49. GRB 050406: Magellan optical observations
  50. GRB 050406: early Swift XRT analysis results
  51. GRB 050406 BAT refined analysis
  52. GRB 050406: Early observations with Swift-UVOT
  53. GRB 050406: Swift XRT Position
  54. Konus-Wind observation of GRB 050401
  55. GRB050401: Radio observation at 610 MHz with GMRT
  56. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  57. GRB 050401: VLT spectroscopic redshift
  58. GRB 050401 Optical Observations
  59. GRB050401: Maidanak optical observation
  60. GRB 050401 BAT refined analysis
  61. GRB050401: TNG R-band observation
  62. GRB 050402A: IR Analysis
  63. GRB050402: XDSS counterpart
  64. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  65. GRB 050401: Optical afterglow confirmed
  66. Swift-BAT detection of GRB 050401
  67. Retraction of three Swift GRB triggers
  68. GRB050331: No Afterglow Detected
  69. Swift-BAT detection of GRB 050331b
  70. GRB 050331: Swift UVOT Source
  71. Swift-BAT detection of GRB 050331
  72. Swift Data Publicly Available Starting April 5, 2005
  73. GRB050319: radio observation
  74. Konus-Wind observation of GRB 050326
  75. GRB050326: optical limit
  76. GRB 050326: Early observations with Swift-UVOT
  77. GRB 050326 XMM-Newton observation
  78. GRB 050326 : Planned XMM-Newton observation
  79. GRB 050326: Swift XRT Position
  80. GRB050326: optical limit 33min before GRB
  81. GRB 050326 BAT refined analysis
  82. GRB050326: delayed XRT observation
  83. Swift-BAT detection of a bright GRB 050326
  84. GRB050319, optical observations
  85. GRB050319, color indices
  86. GRB050319: optical observation, March 20-22
  87. GRB050319: RTT150 Optical Observations
  88. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  89. GRB 050319: ROTSE-III Refined Analysis
  90. GRB 050318: Swift-BAT refined analysis
  91. GRB050319: VLA Observations
  92. GRB050319: radio observation
  93. GRB 050319 R band observations
  94. GRB 050319: Swift-UVOT detection of the afterglow
  95. GRB 050315: Variability Analysis of Swift BAT Time History
  96. GRB050319: Radio Observations
  97. GRB 050319: NIR afterglow candidate
  98. GRB 050319:Near IR afterglow
  99. GRB050319: BR optical photometry
  100. GRB 050318: SWIFT-UVOT refined analysis

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