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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"

42834 results found.

  1. GRB 050412: Swift XRT Position
  2. GRB 050412: LCO optical observations
  3. GRB050412: ROTSE-III Optical Limits
  4. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  5. GRB 050412: IR Observations
  6. GRB050408: Radio Observations
  7. GRB050410: P60 Observations
  8. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  9. GRB 050408: PROMPT VRcIc Observations
  10. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  11. GRB 050410 R band Optical Observations
  12. GRB050410 : Null detection report
  13. GRB 050410, optical observations
  14. GRB050410: Radio Observations
  15. GRB 050408: Swift XRT measurement of possible jet break
  16. GRB 050410: Early observations with Swift-UVOT
  17. Swift-BAT detection of GRB 050410
  18. GRB 050410: Swift XRT Position
  19. GRB 050408: Inconsistency of host galaxy identification
  20. GRB 050408: Subaru Observations
  21. GRB 050408: SOAR UBVRc Observations
  22. GRB 050408: Properties of the Host Galaxy
  23. GRB 050408: Mercator Optical Observations
  24. GRB050408: Radio Observations
  25. GRB 050408: Swift XRT analysis
  26. GRB 050408, SMARTS optical/IR afterglow observations
  27. GRB 050408: Optical limit at 20 min after the burst
  28. GRB 050408, optical observations
  29. GRB050408: REM NIR and Optical observation
  30. GRB 050408: Moderate-resolution Gemini Spectroscopy
  31. GRB 050408,optical observation
  32. GRB 050408: Emission and absorption redshift
  33. GRB 050408: Mercator Optical Observations
  34. GRB 050408: Magellan astrometry and photometry
  35. GRB 050408: First Optical observations with TFOSC at the RTT150
  36. GRB 050408: steepening of the optical decay
  37. GRB 050408: Optical afterglow confirmed
  38. GRB 050408: opitcal observation
  39. GRB 050408, optical observations
  40. GRB 050408 optical candidate
  41. GRB 050408: Swift XRT Position
  42. GRB 050408: ROTSE-III Optical Limits
  43. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  44. GRB050401: Radio Detection
  45. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  46. GRB 050406: Magellan optical observations
  47. GRB 050406: early Swift XRT analysis results
  48. GRB 050406 BAT refined analysis
  49. GRB 050406: Early observations with Swift-UVOT
  50. GRB 050406: Swift XRT Position
  51. Swift-BAT detection of GRB 050406
  52. Konus-Wind observation of GRB 050401
  53. GRB050401: Radio observation at 610 MHz with GMRT
  54. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  55. GRB 050401: VLT spectroscopic redshift
  56. GRB 050401 Optical Observations
  57. GRB 050401 BAT refined analysis
  58. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  59. GRB050401: TNG R-band observation
  60. GRB 050402A: IR Analysis
  61. GRB050402: XDSS counterpart
  62. GRB 050402A: IR Observations
  63. GRB 050402: Early observations with Swift-UVOT
  64. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  65. GRB 050401: Optical afterglow confirmed
  66. GRB 050401: Optical afterglow candidate
  67. Swift-BAT detection of GRB 050401
  68. GRB 050401: Prompt XRT position
  69. Retraction of three Swift GRB triggers
  70. GRB050331: No Afterglow Detected
  71. Swift-BAT detection of GRB 050331b
  72. GRB 050331: Swift UVOT Source
  73. Swift-BAT detection of GRB 050331
  74. GRB 050331: Swift XRT Position
  75. Swift Data Publicly Available Starting April 5, 2005
  76. GRB050319: radio observation
  77. Konus-Wind observation of GRB 050326
  78. GRB050326: optical limit
  79. GRB 050326: Early observations with Swift-UVOT
  80. GRB 050326 XMM-Newton observation
  81. GRB 050326: Swift XRT Position
  82. GRB 050326 BAT refined analysis
  83. GRB050326: delayed XRT observation
  84. Swift-BAT detection of a bright GRB 050326
  85. GRB050319, optical observations
  86. GRB050319, color indices
  87. GRB050319: optical observation, March 20-22
  88. GRB050319: RTT150 Optical Observations
  89. Swift-BAT detection of a bright outburst from SGR1806-20
  90. Swift-BAT trigger 112060 is not a real GRB
  91. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  92. GRB 050319: ROTSE-III Refined Analysis
  93. GRB 050318: Swift-BAT refined analysis
  94. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  95. GRB050319: VLA Observations
  96. GRB 050319 R band observations
  97. GRB 050319: Swift-UVOT detection of the afterglow
  98. GRB 050315: Variability Analysis of Swift BAT Time History
  99. GRB050319: Radio Observations
  100. GRB 050319: NIR afterglow candidate

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