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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"

41729 results found.

  1. GRB 050412: IR and Optical observations
  2. GRB 050412: IR Observations
  3. GRB050408: Radio Observations
  4. GRB 050401: Optical limit
  5. GRB050410: P60 Observations
  6. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  7. GRB 050410, optical observations
  8. GRB 050408: PROMPT VRcIc Observations
  9. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  10. GRB 050410 R band Optical Observations
  11. GRB 050410, optical observations
  12. GRB050410: Radio Observations
  13. GRB 050408: Swift XRT measurement of possible jet break
  14. GRB050410: MASTER optical observations
  15. GRB 050410: Early observations with Swift-UVOT
  16. Swift-BAT detection of GRB 050410
  17. GRB 050408: Inconsistency of host galaxy identification
  18. GRB 050408: Subaru Observations
  19. GRB 050408: WIDGET simultaneous optical observations
  20. GRB 050408: SOAR UBVRc Observations
  21. GRB 050408: Properties of the Host Galaxy
  22. GRB 050408: Mercator Optical Observations
  23. GRB050408: Radio Observations
  24. GRB 050408: Swift XRT analysis
  25. GRB 050408, SMARTS optical/IR afterglow observations
  26. GRB 050408: Optical limit at 20 min after the burst
  27. GRB 050408, optical observations
  28. GRB050408: REM NIR and Optical observation
  29. GRB 050408: Moderate-resolution Gemini Spectroscopy
  30. GRB 050408,optical observation
  31. GRB 050408 Optical Observations
  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: Optical afterglow confirmed
  37. GRB 050408: opitcal observation
  38. GRB 050408, optical observations
  39. GRB 050408 optical candidate
  40. GRB050408: MASTER optical observations
  41. GRB050401: Radio Detection
  42. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  43. GRB 050406: Magellan optical observations
  44. GRB 050406 BAT refined analysis
  45. GRB 050406: Early observations with Swift-UVOT
  46. Swift-BAT detection of GRB 050406
  47. Konus-Wind observation of GRB 050401
  48. GRB050401: Radio observation at 610 MHz with GMRT
  49. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  50. GRB 050401: VLT spectroscopic redshift
  51. GRB 050401 Optical Observations
  52. GRB050401: Maidanak optical observation
  53. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  54. GRB050401: TNG R-band observation
  55. GRB 050402A: IR Observations
  56. GRB 050402: Early observations with Swift-UVOT
  57. Swift Trigger 113225: P60 Observations
  58. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  59. GRB 050401: Optical afterglow confirmed
  60. GRB 050401: Optical afterglow candidate
  61. Swift-BAT detection of GRB 050401
  62. GRB 050401: Prompt XRT position
  63. GRB050331: No Afterglow Detected
  64. GRB 050331: Swift UVOT Source
  65. Swift-BAT detection of GRB 050331
  66. GRB050319: radio observation
  67. Konus-Wind observation of GRB 050326
  68. GRB050326: optical limit
  69. GRB 050326: Early observations with Swift-UVOT
  70. GRB 050326 XMM-Newton observation
  71. GRB 050326: Swift XRT Position
  72. GRB 050326 BAT refined analysis
  73. GRB050326: delayed XRT observation
  74. Swift-BAT detection of a bright GRB 050326
  75. GRB050319, optical observations
  76. GRB050319, color indices
  77. GRB050319: optical observation, March 20-22
  78. GRB050319: RTT150 Optical Observations
  79. Swift-BAT detection of a bright outburst from SGR1806-20
  80. GRB 050319: ROTSE-III Refined Analysis
  81. GRB050319: VLA Observations
  82. GRB 050319 R band observations
  83. GRB 050319: Swift-UVOT detection of the afterglow
  84. GRB 050315: Variability Analysis of Swift BAT Time History
  85. GRB050319: Radio Observations
  86. GRB 050319: NIR afterglow candidate
  87. GRB 050319:Near IR afterglow
  88. GRB050319: BR optical photometry
  89. GRB 050319: Optical observation
  90. GRB 050319 : Confirmation of optical afterglow decay
  91. GRB050319,optical observation
  92. Swift Detection of GRB 050319
  93. GRB 050319: Detection of Possible Optical Counterpart
  94. GRB 050318: Swift/UVOT detection of afterglow emission
  95. GRB 050318: Magellan optical afterglow identification
  96. GRB050318: Swift XRT position
  97. RXTE Observations of GRB050318
  98. Swift-BAT detection of GRB 050318
  99. GRB 050315, SMARTS optical afterglow decay
  100. GRB050223: analysis of the XMM-Newton observation

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