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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"

19611 results found.

  1. GRB 151027A: Enhanced Swift-XRT position
  2. GRB 151027A : ISON-NM early optical detection
  3. GRB 151027A: KAIT optical afterglow confirmation
  4. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  5. GRB 151021A: Skynet PROMPT-CTIO/DSO17 observations of the optical afterglow
  6. GRB 151023A: Swift-BAT refined analysis
  7. LIGO/Virgo G194575: Swift observations
  8. GRB 151023A: Swift-XRT refined Analysis
  9. GRB 151023A: Swift/UVOT Upper Limits
  10. GRB 151023A
  11. GRB 151023A: Enhanced Swift-XRT position
  12. GRB 151022A: Swift/UVOT Upper Limits
  13. GRB 151022A: Swift-BAT refined analysis
  14. GRB 151023A: Swift detection of a burst
  15. GRB 151022A: RATIR Upper Limits
  16. GRB 151022A: Swift-XRT refined Analysis
  17. LIGO/Virgo G194575: Fermi GBM Observations
  18. GRB 151022A: Enhanced Swift-XRT position
  19. LIGO/Virgo G194575: Identification of a GW CBC Candidate
  20. GRB 151022A: Mondy optical upper limit
  21. GRB 151022A: Kanata/HOWPol optical observation
  22. GRB 151022A: Prompt enhanced Swift-XRT position
  23. GRB 151022A: MASTER-Ural observations
  24. GRB 151022A: Swift detection of a burst
  25. Konus-Wind observation of GRB 151021A
  26. GRB 151021A: Swift/UVOT Detection
  27. GRB 151021A: Swift-XRT refined Analysis
  28. GRB 151021A: Swift-BAT refined analysis
  29. GRB 151021A: Enhanced Swift-XRT position
  30. GRB 151021A: MASTER-NET bright OT detection
  31. GRB 151021A: Swift detection of a burst
  32. GRB 151004A: Swift-XRT follow-up observations
  33. Trigger 659734: Swift detection of SAX J1750.8-2900 or other source near Galactic center
  34. GRB 151006A: Mondy optical upper limit
  35. Konus-Wind observation of GRB 151006A
  36. Swift Trigger 658045 is not a GRB
  37. GRB 151006A: Swift-BAT refined analysis
  38. GRB 151006A: Swift-XRT refined Analysis
  39. GRB 151006A: Fermi-LAT detection
  40. GRB 151006A: Swift/UVOT Upper Limits
  41. GRB 151006A: Fermi GBM detection
  42. GRB 151006A: Enhanced Swift-XRT position
  43. Konus-Wind observation of GRB 151001B
  44. GRB 151006A: Kanata/HOWPol optical imaging polarimetry
  45. GRB 151006A: Prompt enhanced Swift-XRT position
  46. GRB 151006A: Swift detection of a burst
  47. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  48. Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
  49. Swift Trigger 657564: MASTER-NET early optical observations.
  50. Swift Trigger 657564: XRT prompt analysis
  51. Swift Trigger 657564: a probable GRB
  52. GRB 151001A: Swift-BAT refined analysis
  53. GRB 151001A: RATIR Observations
  54. GRB 151001B: Swift/UVOT Upper Limits
  55. GRB 151001B: Swift-XRT refined Analysis
  56. GRB 151001B: Swift-BAT refined analysis
  57. GRB 151001A: Swift/UVOT Detection
  58. GRB 151001B: MASTER-NET early optical observations.
  59. GRB 151001A: NOT imaging
  60. GRB 151001A: Swift-XRT refined Analysis
  61. GRB 151001B: Enhanced Swift-XRT position
  62. GRB 151001A: Enhanced Swift-XRT position
  63. GRB 151001A: Fermi GBM detection
  64. GRB 151001B: Swift detection of a burst
  65. GRB 151001A: Swift detection of a burst with an optical counterpart
  66. GRB 150925A: Swift/UVOT Upper Limits
  67. GRB 150925A: Swift-BAT refined analysis
  68. GRB 150925A: Swift-XRT refined Analysis
  69. GRB 150925A: Enhanced Swift-XRT position
  70. GRB 150925A: Swift detection of a burst
  71. ANTARES neutrino detection: Fermi GBM Observations
  72. LIGO/Virgo G184098: Swift follow-up observations
  73. LIGO/Virgo G184098: Nearby Galaxies in Error Circle
  74. LIGO/Virgo G184098: Swift follow-up observations
  75. GRB 150915A: Swift-XRT refined Analysis
  76. GRB 150915A, Swift-BAT refined analysis
  77. Konus-Wind observation of GRB 150911A
  78. GRB 150915A: Swift UVOT upper limits
  79. GRB 150915A: GROND detection of an optical counterpart candidate
  80. GRB 150915A: MASTER-NET optical observations
  81. GRB 150915A: Swift detection of a burst
  82. GRB 150910A: T100 observations
  83. GRB 150911A: GROND Upper Limits
  84. GRB 150907A: Swift-XRT afterglow detection
  85. GRB 150912A: Swift-XRT and UVOT observations
  86. GRB 150912A: Swift ToO observations
  87. GRB150911A: P60 Observations
  88. GRB 150911A: Swift/UVOT Upper Limits
  89. GRB 150911A: Swift-BAT refined analysis
  90. GRB 150911A: Swift-XRT refined Analysis
  91. GRB 150910A: VLA Detection
  92. GRB 150911A: Enhanced Swift-XRT position
  93. GRB 150911A: Swift detection of a burst
  94. GRB 150910A: GROND observation of the afterglow
  95. GRB 150910A: Swift-XRT refined Analysis
  96. GRB 150910A: Enhanced Swift-XRT position
  97. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  98. GRB 150910A: Swift-BAT refined analysis
  99. GRB 150910A: LCOGT FTN afterglow observations
  100. GRB 150910A: KAIT Optical Afterglow Detection

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