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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"

37763 results found.

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

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