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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"

19662 results found.

  1. GRB 151111A: Swift detection of a burst
  2. GRB 151027A: continued Mondy optical observations
  3. GRB 151107A: Further investigation of the source nature
  4. LIGO/Virgo G194575: Swift observations if iPTF15dld
  5. GRB 151107A, Swift-BAT refined analysis
  6. GRB 151107A: MASTER-NET optical observations
  7. GRB 151107A: Swift detection of a possible burst
  8. Swift-BAT triggers are disabled
  9. GRB 151027A: Mondy optical observations
  10. GRB 150910A: CrAO optical observations
  11. GRB 151031A: GROND observation
  12. GRB 151027B: ATCA radio detection
  13. GRB 151031A: Swift/UVOT Detection
  14. GRB 151031A: Swift-XRT refined Analysis
  15. GRB 151031A: Swift-BAT refined analysis
  16. GRB 151031A: Enhanced Swift-XRT position
  17. GRB 151031A: Swift detection of a burst
  18. Correction to the Trigger Time for Swift GRB 151029A
  19. GRB 151027A: Optical counterpart detection
  20. GRB 151029A: Swift-XRT refined Analysis
  21. GRB 151029A: Swift/UVOT Detection
  22. GRB 151029A: LCOGT-FTS afterglow observations
  23. GRB 151027B: Swift UVOT detection
  24. GRB 151029A: Swift-BAT refined analysis
  25. GRB 151029A: Enhanced Swift-XRT position
  26. GRB 151027A: MAXI/GSC detection
  27. GRB 151029A: GROND afterglow observations
  28. GRB 151029A: Swift detection of a burst with an optical counterpart
  29. GRB 151027B: LCOGT FTN afterglow observations
  30. GRB 151027A: NOT optical and NIR observations
  31. GRB 151027A: T100 observations
  32. GRB 151027B: Swift/UVOT Upper Limits
  33. Konus-Wind observation of GRB 151027A
  34. GRB 151027B: Swift-BAT refined analysis
  35. GRB 151027B: RATIR Observations
  36. GRB 151027B: MASTER-NET early OT detection
  37. GRB 151027A: LCOGT-McDonald afterglow observations
  38. GRB 151027B: Swift-XRT refined Analysis
  39. GRB 151027A: VLA detection
  40. GRB 151027B: GROND Optical/NIR Afterglow Detection
  41. GRB 151027B: VLT/X-shooter redshift
  42. GRB 151027B: Enhanced Swift-XRT position
  43. GRB 151027A: UVOT Observations
  44. GRB 151027B: NOT optical afterglow candidate
  45. GRB 151027B: Swift detection of its 1000-th burst
  46. GRB 151027A: Swift-BAT refined analysis
  47. GRB 151027A: Early RAPTOR Observations
  48. GRB 151027A: Fermi GBM observation
  49. GRB 151027A: Swift-XRT refined Analysis
  50. LIGO/Virgo G194575: Swift observations of LSQ15bjb
  51. Tentative redshift for GRB 151027A from Swift-XRT data
  52. GRB 151027A: Enhanced Swift-XRT position
  53. GRB 151027A : ISON-NM early optical detection
  54. GRB 151027A: KAIT optical afterglow confirmation
  55. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  56. GRB 151021A: Skynet PROMPT-CTIO/DSO17 observations of the optical afterglow
  57. GRB 151023A: Swift-BAT refined analysis
  58. LIGO/Virgo G194575: Swift observations
  59. GRB 151023A: Swift-XRT refined Analysis
  60. GRB 151023A: Swift/UVOT Upper Limits
  61. GRB 151023A
  62. GRB 151023A: Enhanced Swift-XRT position
  63. GRB 151022A: Swift/UVOT Upper Limits
  64. GRB 151022A: Swift-BAT refined analysis
  65. GRB 151023A: Swift detection of a burst
  66. GRB 151022A: RATIR Upper Limits
  67. GRB 151022A: Swift-XRT refined Analysis
  68. LIGO/Virgo G194575: Fermi GBM Observations
  69. GRB 151022A: Enhanced Swift-XRT position
  70. LIGO/Virgo G194575: Identification of a GW CBC Candidate
  71. GRB 151022A: Mondy optical upper limit
  72. GRB 151022A: Kanata/HOWPol optical observation
  73. GRB 151022A: Prompt enhanced Swift-XRT position
  74. GRB 151022A: MASTER-Ural observations
  75. GRB 151022A: Swift detection of a burst
  76. Konus-Wind observation of GRB 151021A
  77. GRB 151021A: Swift/UVOT Detection
  78. GRB 151021A: Swift-XRT refined Analysis
  79. GRB 151021A: Swift-BAT refined analysis
  80. GRB 151021A: Enhanced Swift-XRT position
  81. GRB 151021A: MASTER-NET bright OT detection
  82. GRB 151021A: Swift detection of a burst
  83. GRB 151004A: Swift-XRT follow-up observations
  84. Trigger 659734: Swift detection of SAX J1750.8-2900 or other source near Galactic center
  85. GRB 151006A: Mondy optical upper limit
  86. Konus-Wind observation of GRB 151006A
  87. Swift Trigger 658045 is not a GRB
  88. GRB 151006A: Swift-BAT refined analysis
  89. GRB 151006A: Swift-XRT refined Analysis
  90. GRB 151006A: Fermi-LAT detection
  91. GRB 151006A: Swift/UVOT Upper Limits
  92. GRB 151006A: Fermi GBM detection
  93. GRB 151006A: Enhanced Swift-XRT position
  94. Konus-Wind observation of GRB 151001B
  95. GRB 151006A: Kanata/HOWPol optical imaging polarimetry
  96. GRB 151006A: Prompt enhanced Swift-XRT position
  97. GRB 151006A: Swift detection of a burst
  98. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  99. Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
  100. Swift Trigger 657564: MASTER-NET early optical observations.

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