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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"

45722 results found.

  1. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  2. GRB 050410 R band Optical Observations
  3. GRB050410 : Null detection report
  4. GRB 050410, optical observations
  5. GRB050410: Radio Observations
  6. GRB 050408: Swift XRT measurement of possible jet break
  7. GRB050410: MASTER optical observations
  8. GRB 050410: Early observations with Swift-UVOT
  9. Swift-BAT detection of GRB 050410
  10. GRB 050410: Swift XRT Position
  11. GRB 050408: Retraction of Proposed Host Galaxy
  12. GRB 050408: Inconsistency of host galaxy identification
  13. GRB 050408: Subaru Observations
  14. GRB 050408: WIDGET simultaneous optical observations
  15. GRB 050408: SOAR UBVRc Observations
  16. GRB 050408: Properties of the Host Galaxy
  17. GRB 050408: Mercator Optical Observations
  18. GRB050408: Radio Observations
  19. GRB 050408: Swift XRT analysis
  20. GRB 050408, SMARTS optical/IR afterglow observations
  21. GRB 050408: Optical limit at 20 min after the burst
  22. GRB 050408, optical observations
  23. GRB050408: REM NIR and Optical observation
  24. GRB 050408: Moderate-resolution Gemini Spectroscopy
  25. GRB 050408,optical observation
  26. GRB 050408 Optical Observations
  27. GRB 050408: Emission and absorption redshift
  28. GRB 050408: Mercator Optical Observations
  29. GRB 050408: Magellan astrometry and photometry
  30. GRB 050408: First Optical observations with TFOSC at the RTT150
  31. GRB 050408: steepening of the optical decay
  32. GRB 050408: Optical afterglow confirmed
  33. GRB 050408: opitcal observation
  34. GRB 050408, optical observations
  35. GRB 050408 optical candidate
  36. GRB 050408: Swift XRT Position
  37. GRB 050408: ROTSE-III Optical Limits
  38. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  39. GRB050408: MASTER optical observations
  40. GRB050401: Radio Detection
  41. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  42. GRB 050406: Magellan optical observations
  43. GRB 050406: early Swift XRT analysis results
  44. GRB 050406 BAT refined analysis
  45. GRB 050406: Early observations with Swift-UVOT
  46. GRB 050406: Swift XRT Position
  47. Swift-BAT detection of GRB 050406
  48. Konus-Wind observation of GRB 050401
  49. GRB050401: Radio observation at 610 MHz with GMRT
  50. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  51. GRB 050401: VLT spectroscopic redshift
  52. GRB 050401 Optical Observations
  53. GRB050401: Maidanak optical observation
  54. GRB 050401 BAT refined analysis
  55. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  56. GRB050401: TNG R-band observation
  57. GRB 050402A: IR Analysis
  58. GRB050402: XDSS counterpart
  59. GRB 050402A: IR Observations
  60. GRB 050402: Early observations with Swift-UVOT
  61. Swift Trigger 113225: P60 Observations
  62. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  63. GRB 050401: Optical afterglow confirmed
  64. GRB 050401: Optical afterglow candidate
  65. Swift-BAT detection of GRB 050401
  66. GRB 050401: Prompt XRT position
  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. GRB 050331: Swift XRT Position
  73. Swift Data Publicly Available Starting April 5, 2005
  74. GRB050319: radio observation
  75. Konus-Wind observation of GRB 050326
  76. GRB050326: optical limit
  77. GRB 050326: Early observations with Swift-UVOT
  78. GRB 050326 XMM-Newton observation
  79. GRB 050326 : Planned XMM-Newton observation
  80. GRB 050326: Swift XRT Position
  81. GRB050326: optical limit 33min before GRB
  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. GRB050319: radio observation
  97. GRB 050319 R band observations
  98. GRB 050319: Swift-UVOT detection of the afterglow
  99. GRB 050315: Variability Analysis of Swift BAT Time History
  100. GRB050319: Radio Observations

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