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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"

19665 results found.

  1. Swift Trigger 657564: XRT prompt analysis
  2. Swift Trigger 657564: a probable GRB
  3. GRB 151001A: Swift-BAT refined analysis
  4. GRB 151001A: RATIR Observations
  5. GRB 151001B: Swift/UVOT Upper Limits
  6. GRB 151001B: Swift-XRT refined Analysis
  7. GRB 151001B: Swift-BAT refined analysis
  8. GRB 151001A: Swift/UVOT Detection
  9. GRB 151001B: MASTER-NET early optical observations.
  10. GRB 151001A: NOT imaging
  11. GRB 151001A: Swift-XRT refined Analysis
  12. GRB 151001B: Enhanced Swift-XRT position
  13. GRB 151001A: Enhanced Swift-XRT position
  14. GRB 151001A: Fermi GBM detection
  15. GRB 151001B: Swift detection of a burst
  16. GRB 151001A: Swift detection of a burst with an optical counterpart
  17. GRB 150925A: Swift/UVOT Upper Limits
  18. GRB 150925A: Swift-BAT refined analysis
  19. GRB 150925A: Swift-XRT refined Analysis
  20. GRB 150925A: Enhanced Swift-XRT position
  21. GRB 150925A: Swift detection of a burst
  22. ANTARES neutrino detection: Fermi GBM Observations
  23. LIGO/Virgo G184098: Swift follow-up observations
  24. LIGO/Virgo G184098: Nearby Galaxies in Error Circle
  25. LIGO/Virgo G184098: Swift follow-up observations
  26. GRB 150915A: Swift-XRT refined Analysis
  27. GRB 150915A, Swift-BAT refined analysis
  28. Konus-Wind observation of GRB 150911A
  29. GRB 150915A: Swift UVOT upper limits
  30. GRB 150915A: GROND detection of an optical counterpart candidate
  31. GRB 150915A: MASTER-NET optical observations
  32. GRB 150915A: Swift detection of a burst
  33. GRB 150910A: T100 observations
  34. GRB 150911A: GROND Upper Limits
  35. GRB 150907A: Swift-XRT afterglow detection
  36. GRB 150912A: Swift-XRT and UVOT observations
  37. GRB 150912A: Swift ToO observations
  38. GRB150911A: P60 Observations
  39. GRB 150911A: Swift/UVOT Upper Limits
  40. GRB 150911A: Swift-BAT refined analysis
  41. GRB 150911A: Swift-XRT refined Analysis
  42. GRB 150910A: VLA Detection
  43. GRB 150911A: Enhanced Swift-XRT position
  44. GRB 150911A: Swift detection of a burst
  45. GRB 150910A: GROND observation of the afterglow
  46. GRB 150910A: Swift-XRT refined Analysis
  47. GRB 150910A: Enhanced Swift-XRT position
  48. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  49. GRB 150910A: Swift-BAT refined analysis
  50. GRB 150910A: LCOGT FTN afterglow observations
  51. GRB 150910A: KAIT Optical Afterglow Detection
  52. GRB 150910A: Swift detection of a burst with an optical afterglow
  53. Swift Trigger 654954 is not an astrophysical event
  54. GRB 150907B: Swift-XRT refined Analysis
  55. IPN Triangulation of GRB 150906B (short/intense)
  56. GRB 150907B: Swift-BAT refined analysis
  57. GRB150907A: Swift/UVOT observations
  58. GRB 150907B: MASTER-SAAO early optical observations
  59. GRB 150907B: Enhanced Swift-XRT position
  60. GRB 150907B: GROND Upper Limits
  61. GRB 150907B: Swift-XRT observations
  62. GRB 150907A: Swift-XRT observations
  63. GRB 150907B: Swift detection of a burst
  64. GRB 150907A: Tiled Swift observations
  65. GRB 150818A: TSHAO and SAO RAS optical observations
  66. GRB 150902A: Swift-XRT afterglow detection
  67. ANTARES neutrino detection: ANU 2.3m and Kepler K2 Observations of the Swift x-ray source
  68. ANTARES neutrino detection: CAHA photometry & spectroscopy of the Swift source
  69. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  70. ANTARES neutrino detection and Swift/XRT counterpart: GMG observation
  71. GRB 150902A: Swift/UVOT Upper Limits
  72. GRB 150902A: Swift-XRT observations
  73. ANTARES neutrino detection: Optical/NIR spectroscopy of the Swift/XRT counterpart candidate from NOT
  74. GRB 150901A, Swift-BAT refined analysis
  75. ANTARES neutrino detection and possible Swift X-ray counterpart
  76. GRB 150902A: Swift ToO observations
  77. GRB 150902A: Fermi-LAT detection
  78. GRB 150831B: Swift/UVOT Upper Limits
  79. Konus-Wind observation of GRB 150831A
  80. GRB 150901A: Swift detection of a burst
  81. GRB 150821A: Flattening in the UVOT light curve
  82. GRB 150831B: Swift-BAT refined analysis
  83. GRB 150831B: Swift-XRT refined Analysis
  84. GRB 150831B: MASTER-IAC early optical observations
  85. GRB 150831B: Fermi GBM detection
  86. GRB 150831A: GROND Upper Limits
  87. GRB 150831A: Swift/UVOT Upper Limits
  88. GRB 150831B: Swift-XRT observations
  89. GRB 150831A: Swift-XRT refined Analysis
  90. GRB 150831B: Swift detection of a probable burst
  91. GRB 150831A: Swift-BAT refined analysis
  92. GRB 150831A: Enhanced Swift-XRT position
  93. GRB 150831A: optical upper limit ISON-SSO
  94. GRB 150831A: Swift detection of a short burst
  95. GRB 150818A: possible SN rise in light curve of Mondy observations
  96. Konus-Wind observation of GRB 150821A
  97. GRB 150821A: LCOGT Siding Springs early observations
  98. Konus-Wind observation of GRB 150818A
  99. GRB 150821A: LCOGT Sutherland observations
  100. GRB 150821A, Swift-BAT refined analysis

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