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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"

41733 results found.

  1. GRB 050412: Optical observations
  2. GRB050412: P60 Observations
  3. GRB 050412: LCO optical observations
  4. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  5. GRB 050412: IR and Optical observations
  6. GRB 050412: IR Observations
  7. GRB050408: Radio Observations
  8. GRB 050401: 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. GRB 050410 R band Optical Observations
  15. GRB 050410, optical observations
  16. GRB050410: Radio Observations
  17. GRB 050408: Swift XRT measurement of possible jet break
  18. GRB050410: MASTER optical observations
  19. GRB 050410: Early observations with Swift-UVOT
  20. Swift-BAT detection of GRB 050410
  21. GRB 050408: Inconsistency of host galaxy identification
  22. GRB 050408: Subaru Observations
  23. GRB 050408: WIDGET simultaneous optical observations
  24. GRB 050408: SOAR UBVRc Observations
  25. GRB 050408: Properties of the Host Galaxy
  26. GRB 050408: Mercator Optical Observations
  27. GRB050408: Radio Observations
  28. GRB 050408: Swift XRT analysis
  29. GRB 050408, SMARTS optical/IR afterglow observations
  30. GRB 050408: Optical limit at 20 min after the burst
  31. GRB 050408, optical observations
  32. GRB050408: REM NIR and Optical observation
  33. GRB 050408: Moderate-resolution Gemini Spectroscopy
  34. GRB 050408,optical observation
  35. GRB 050408 Optical Observations
  36. GRB 050408: Emission and absorption redshift
  37. GRB 050408: Mercator Optical Observations
  38. GRB 050408: Magellan astrometry and photometry
  39. GRB 050408: First Optical observations with TFOSC at the RTT150
  40. GRB 050408: Optical afterglow confirmed
  41. GRB 050408: opitcal observation
  42. GRB 050408, optical observations
  43. GRB 050408 optical candidate
  44. GRB050408: MASTER optical observations
  45. GRB050401: Radio Detection
  46. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  47. GRB 050406: Magellan optical observations
  48. GRB 050406 BAT refined analysis
  49. GRB 050406: Early observations with Swift-UVOT
  50. Swift-BAT detection of GRB 050406
  51. Konus-Wind observation of GRB 050401
  52. GRB050401: Radio observation at 610 MHz with GMRT
  53. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  54. GRB 050401: VLT spectroscopic redshift
  55. GRB 050401 Optical Observations
  56. GRB050401: Maidanak optical observation
  57. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  58. GRB050401: TNG R-band observation
  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. GRB050331: No Afterglow Detected
  68. GRB 050331: Swift UVOT Source
  69. Swift-BAT detection of GRB 050331
  70. GRB050319: radio observation
  71. Konus-Wind observation of GRB 050326
  72. GRB050326: optical limit
  73. GRB 050326: Early observations with Swift-UVOT
  74. GRB 050326 XMM-Newton observation
  75. GRB 050326: Swift XRT Position
  76. GRB 050326 BAT refined analysis
  77. GRB050326: delayed XRT observation
  78. Swift-BAT detection of a bright GRB 050326
  79. GRB050319, optical observations
  80. GRB050319, color indices
  81. GRB050319: optical observation, March 20-22
  82. GRB050319: RTT150 Optical Observations
  83. Swift-BAT detection of a bright outburst from SGR1806-20
  84. GRB 050319: ROTSE-III Refined Analysis
  85. GRB050319: VLA Observations
  86. GRB 050319 R band observations
  87. GRB 050319: Swift-UVOT detection of the afterglow
  88. GRB 050315: Variability Analysis of Swift BAT Time History
  89. GRB050319: Radio Observations
  90. GRB 050319: NIR afterglow candidate
  91. GRB 050319:Near IR afterglow
  92. GRB050319: BR optical photometry
  93. GRB 050319: Optical observation
  94. GRB 050319 : Confirmation of optical afterglow decay
  95. GRB050319,optical observation
  96. Swift Detection of GRB 050319
  97. GRB 050319: Detection of Possible Optical Counterpart
  98. GRB 050318: Swift/UVOT detection of afterglow emission
  99. GRB 050318: Magellan optical afterglow identification
  100. GRB050318: Swift XRT position

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