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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"

42827 results found.

  1. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  2. GRB 050408: PROMPT VRcIc Observations
  3. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  4. GRB 050410 R band Optical Observations
  5. GRB050410 : Null detection report
  6. GRB 050410, optical observations
  7. GRB050410: Radio Observations
  8. GRB 050408: Swift XRT measurement of possible jet break
  9. GRB 050410: Early observations with Swift-UVOT
  10. Swift-BAT detection of GRB 050410
  11. GRB 050410: Swift XRT Position
  12. GRB 050408: Inconsistency of host galaxy identification
  13. GRB 050408: Subaru Observations
  14. GRB 050408: SOAR UBVRc Observations
  15. GRB 050408: Properties of the Host Galaxy
  16. GRB 050408: Mercator Optical Observations
  17. GRB050408: Radio Observations
  18. GRB 050408: Swift XRT analysis
  19. GRB 050408, SMARTS optical/IR afterglow observations
  20. GRB 050408: Optical limit at 20 min after the burst
  21. GRB 050408, optical observations
  22. GRB050408: REM NIR and Optical observation
  23. GRB 050408: Moderate-resolution Gemini Spectroscopy
  24. GRB 050408,optical observation
  25. GRB 050408: Emission and absorption redshift
  26. GRB 050408: Mercator Optical Observations
  27. GRB 050408: Magellan astrometry and photometry
  28. GRB 050408: First Optical observations with TFOSC at the RTT150
  29. GRB 050408: steepening of the optical decay
  30. GRB 050408: Optical afterglow confirmed
  31. GRB 050408: opitcal observation
  32. GRB 050408, optical observations
  33. GRB 050408 optical candidate
  34. GRB 050408: Swift XRT Position
  35. GRB 050408: ROTSE-III Optical Limits
  36. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  37. GRB050401: Radio Detection
  38. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  39. GRB 050406: Magellan optical observations
  40. GRB 050406: early Swift XRT analysis results
  41. GRB 050406 BAT refined analysis
  42. GRB 050406: Early observations with Swift-UVOT
  43. GRB 050406: Swift XRT Position
  44. Swift-BAT detection of GRB 050406
  45. Konus-Wind observation of GRB 050401
  46. GRB050401: Radio observation at 610 MHz with GMRT
  47. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  48. GRB 050401: VLT spectroscopic redshift
  49. GRB 050401 Optical Observations
  50. GRB 050401 BAT refined analysis
  51. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  52. GRB050401: TNG R-band observation
  53. GRB 050402A: IR Analysis
  54. GRB050402: XDSS counterpart
  55. GRB 050402A: IR Observations
  56. GRB 050402: Early observations with Swift-UVOT
  57. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  58. GRB 050401: Optical afterglow confirmed
  59. GRB 050401: Optical afterglow candidate
  60. Swift-BAT detection of GRB 050401
  61. GRB 050401: Prompt XRT position
  62. Retraction of three Swift GRB triggers
  63. GRB050331: No Afterglow Detected
  64. Swift-BAT detection of GRB 050331b
  65. GRB 050331: Swift UVOT Source
  66. Swift-BAT detection of GRB 050331
  67. GRB 050331: Swift XRT Position
  68. Swift Data Publicly Available Starting April 5, 2005
  69. GRB050319: radio observation
  70. Konus-Wind observation of GRB 050326
  71. GRB050326: optical limit
  72. GRB 050326: Early observations with Swift-UVOT
  73. GRB 050326 XMM-Newton observation
  74. GRB 050326: Swift XRT Position
  75. GRB 050326 BAT refined analysis
  76. GRB050326: delayed XRT observation
  77. Swift-BAT detection of a bright GRB 050326
  78. GRB050319, optical observations
  79. GRB050319, color indices
  80. GRB050319: optical observation, March 20-22
  81. GRB050319: RTT150 Optical Observations
  82. Swift-BAT detection of a bright outburst from SGR1806-20
  83. Swift-BAT trigger 112060 is not a real GRB
  84. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  85. GRB 050319: ROTSE-III Refined Analysis
  86. GRB 050318: Swift-BAT refined analysis
  87. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  88. GRB050319: VLA Observations
  89. GRB 050319 R band observations
  90. GRB 050319: Swift-UVOT detection of the afterglow
  91. GRB 050315: Variability Analysis of Swift BAT Time History
  92. GRB050319: Radio Observations
  93. GRB 050319: NIR afterglow candidate
  94. GRB 050319:Near IR afterglow
  95. GRB050319: BR optical photometry
  96. GRB 050318: SWIFT-UVOT refined analysis
  97. GRB 050319: Swift-BAT refined analysis
  98. GRB050319,optical observation
  99. Swift Detection of GRB 050319
  100. GRB 050319: Detection of Possible Optical Counterpart

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