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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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').

18073 results found.

  1. GRB 081102: MASTER VWF promt observation
  2. GRB 081102: Swift detection of a burst
  3. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  4. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  5. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  6. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  7. GRB 081024B: BTA deep optical observations
  8. GRB 081028: CrAO optical observations
  9. GRB 081024B: new Swift-XRT observations
  10. Radio observation of GRB 080229b with ATCA
  11. GRB 081029: UVOT Detection of the Optical Afterglow
  12. GRB 081029: Swift-BAT refined analysis
  13. GRB081029: Swift XRT refined analysis
  14. GRB 081029: Enhanced Swift-XRT position
  15. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  16. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  17. GRB 081029: ROTSE-III Detection of Optical Counterpart
  18. GRB 081029: Swift detection of a burst
  19. GRB081028: UVOT detection of a brightening afterglow
  20. Swift UVOT observations of GRB081028
  21. GRB 081028: Swift-XRT refined analysis
  22. GRB 081028, Swift-BAT refined analysis
  23. GRB 081028: Enhanced Swift-XRT position
  24. GRB 081028: TAROT Calern observatory optical observations
  25. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  26. GRB 081028: Swift detection of a burst
  27. GRB 081024: No radio detection with the VLA
  28. GRB081025: RTT150 optical observations
  29. GRB 081024B: Swift-XRT further observations
  30. GRB 081025 BAT refined analysis
  31. Swift UVOT observations of GRB081025
  32. Swift UVOT observations of GRB081024B
  33. Konus-Wind observation of GRB 081025
  34. GRB 081025: Swift-XRT position
  35. GRB 081024B: Swift-XRT observations
  36. GRB 081025: Burst detection from Swift-BAT slew data
  37. Swift UVOT observations of GRB 081024
  38. GRB 081024: Swift-XRT refined analysis
  39. GRB 081024, Swift-BAT refined analysis
  40. GRB 081024: Enhanced Swift-XRT position
  41. GRB 081024: KAIT Optical Limits
  42. GRB 081024: Early Super-LOTIS Observations
  43. GRB 081024A: ROTSE-III Optical Limits
  44. GRB 081024: Swift detection of a burst
  45. GRB 081022, Swift-BAT refined analysis
  46. GRB 081016A: Swift-XRT refined analysis
  47. GRB 081022: Swift detection of a burst
  48. GRB 081012: Swift-XRT Refined Analysis
  49. Swift trigger 332287 is not a GRB
  50. Swift detection of a possible burst (trigger 332287)
  51. GRB 081012 - Enhanced Swift XRT position
  52. GRB 081017, Swift-BAT refined analysis
  53. GRB 081017: Swift detection of a burst
  54. GRB 081016B, Swift-BAT refined analysis
  55. GRB 081016B: Swift/UVOT Upper Limits
  56. GRB 081011: Swift XRT refined analysis
  57. GRB 081016B: Swift-XRT Team refined Analysis
  58. GRB 081016B: Enhanced Swift-XRT position
  59. GRB 081016B: ROTSE-III Optical Limits
  60. GRB 081016B: Swift detection of a burst
  61. GRB 081011: Enhanced Swift-XRT position
  62. GRB 081016: Swift-XRT candidate afterglow detection
  63. Swift detection of flare on CC Eri
  64. Trigger 331721 Due to Swift startracker loss-of-lock
  65. Detection of flare star Algol in Swift-BAT slew data
  66. Swift-BAT triggered on the flare star Algol
  67. GRB 081012: Fermi GBM detection
  68. GRB 081007 and GRB 081007B: Fermi GBM detection
  69. GRB 081012: Swift/UVOT analysis of initial observations
  70. GRB 081012: Swift/XRT detection
  71. GRB 081012, Swift-BAT refined analysis
  72. GRB 081012: ROTSE-III Optical Limits
  73. GRB 081012: Swift detection of a burst
  74. Revised table for GRB 081011 UVOT detections
  75. GRB081011: UVOT detection of an optical afterglow
  76. GRB 081011: Swift/XRT detection
  77. GRB 081011, Swift-BAT refined analysis
  78. GRB 081011: Swift detection of a burst
  79. GRB 081008, Swift-BAT refined analysis
  80. GRB 081008: Swift-XRT Refined Analysis
  81. GRB081008: Swift/UVOT observations
  82. GRB 081008: Enhanced Swift-XRT position
  83. GRB 081008: Swift detection of a burst with optical afterglow
  84. GRB 081008: ROTSE-III Detection of Optical Counterpart
  85. GRB081007: Swift/UVOT Observations
  86. GRB 081007, Swift-BAT refined analysis
  87. GRB 081007: Early RAPTOR measurements of optical counterpart
  88. GRB 081007: Swift-XRT Team refined analysis
  89. GRB 081007: Enhanced Swift-XRT position
  90. GRB 081007: Swift detection of a burst with optical afterglow
  91. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  92. GRB 081003B: Swift-XRT upper limit
  93. GRB 081003A: OSN optical observations
  94. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  95. GRB 081003A: Swift-XRT Team position and analysis
  96. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  97. GRB 080928: Fermi GBM detection
  98. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  99. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  100. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418

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