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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"

37568 results found.

  1. Swift-BAT detection of GRB 050410
  2. GRB 050410: Swift XRT Position
  3. GRB 050408: Retraction of Proposed Host Galaxy
  4. GRB 050408: Inconsistency of host galaxy identification
  5. GRB 050408: Subaru Observations
  6. GRB 050408: WIDGET simultaneous optical observations
  7. GRB 050408: SOAR UBVRc Observations
  8. GRB 050408: Properties of the Host Galaxy
  9. GRB 050408: Mercator Optical Observations
  10. GRB050408: Radio Observations
  11. GRB 050408: Swift XRT analysis
  12. GRB 050408, SMARTS optical/IR afterglow observations
  13. GRB 050408: Optical limit at 20 min after the burst
  14. GRB 050408, optical observations
  15. GRB 050408: Moderate-resolution Gemini Spectroscopy
  16. GRB 050408,optical observation
  17. GRB 050408 Optical Observations
  18. GRB 050408: Emission and absorption redshift
  19. GRB 050408: Mercator Optical Observations
  20. GRB 050408: Magellan astrometry and photometry
  21. GRB 050408: First Optical observations with TFOSC at the RTT150
  22. GRB 050408: steepening of the optical decay
  23. GRB 050408: Optical afterglow confirmed
  24. GRB 050408: opitcal observation
  25. GRB 050408, optical observations
  26. GRB 050408 optical candidate
  27. GRB 050408: Swift XRT Position
  28. GRB 050408: ROTSE-III Optical Limits
  29. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  30. GRB050408: MASTER optical observations
  31. GRB050401: Radio Detection
  32. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  33. GRB 050406: Magellan optical observations
  34. GRB 050406: early Swift XRT analysis results
  35. GRB 050406 BAT refined analysis
  36. GRB 050406: Early observations with Swift-UVOT
  37. GRB 050406: Swift XRT Position
  38. Swift-BAT detection of GRB 050406
  39. Konus-Wind observation of GRB 050401
  40. GRB050401: Radio observation at 610 MHz with GMRT
  41. GRB 050401: VLT spectroscopic redshift
  42. GRB 050401 Optical Observations
  43. GRB 050401 BAT refined analysis
  44. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  45. GRB050401: TNG R-band observation
  46. GRB 050402A: IR Analysis
  47. GRB 050402A: IR Observations
  48. GRB 050402: Early observations with Swift-UVOT
  49. Swift Trigger 113225: P60 Observations
  50. GRB 050401: Optical afterglow confirmed
  51. GRB 050401: Optical afterglow candidate
  52. Swift-BAT detection of GRB 050401
  53. GRB 050401: Prompt XRT position
  54. Retraction of three Swift GRB triggers
  55. GRB050331: No Afterglow Detected
  56. Swift-BAT detection of GRB 050331b
  57. GRB 050331: Swift UVOT Source
  58. Swift-BAT detection of GRB 050331
  59. GRB 050331: Swift XRT Position
  60. GRB050319: radio observation
  61. Konus-Wind observation of GRB 050326
  62. GRB 050326: Early observations with Swift-UVOT
  63. GRB 050326 XMM-Newton observation
  64. GRB 050326 : Planned XMM-Newton observation
  65. GRB 050326: Swift XRT Position
  66. GRB050326: optical limit 33min before GRB
  67. GRB 050326 BAT refined analysis
  68. GRB050326: delayed XRT observation
  69. Swift-BAT detection of a bright GRB 050326
  70. GRB050319, color indices
  71. GRB050319: RTT150 Optical Observations
  72. Swift-BAT trigger 112060 is not a real GRB
  73. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  74. GRB 050319: ROTSE-III Refined Analysis
  75. GRB 050318: Swift-BAT refined analysis
  76. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  77. GRB050319: VLA Observations
  78. GRB 050319 R band observations
  79. GRB 050319: Swift-UVOT detection of the afterglow
  80. GRB 050315: Variability Analysis of Swift BAT Time History
  81. GRB050319: Radio Observations
  82. GRB 050319: NIR afterglow candidate
  83. GRB 050319:Near IR afterglow
  84. GRB 050318: SWIFT-UVOT refined analysis
  85. GRB 050318: Absorption redshift from Magellan
  86. GRB 050319: Optical observation
  87. GRB 050319 : Confirmation of optical afterglow decay
  88. GRB 050319: Swift-BAT refined analysis
  89. GRB050319,optical observation
  90. Swift Detection of GRB 050319
  91. GRB 050319: Detection of Possible Optical Counterpart
  92. GRB 050318: Swift/UVOT detection of afterglow emission
  93. GRB 050318: Magellan optical afterglow identification
  94. GRB050318: Swift XRT position
  95. RXTE Observations of GRB050318
  96. Swift-BAT detection of GRB 050318
  97. GRB 050315, SMARTS optical afterglow decay
  98. GRB050316: MASTER before, simultanious and follow up optical
  99. GRB 050306: ROTSE-III early limits
  100. GRB050316: MASTER optical observations

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