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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').
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"

19533 results found.

  1. Konus-Wind observation of GRB 140323A
  2. GRB 140323A: Fermi-LAT detection
  3. GRB 140323A: Swift-XRT refined Analysis
  4. GRB 140323A: Fermi GBM observation
  5. GRB 140323A: BOOTES-3 optical upper limit.
  6. GRB 140323A: Swift/UVOT Upper Limits
  7. GRB 140323A: Swift-BAT refined analysis
  8. GRB 140323A: Enhanced Swift-XRT position
  9. GRB 140323A: Swift detection of a burst
  10. GRB 140320A: RATIR Optical and NIR Observations
  11. IPN Triangulation of very intense GRB 140320D
  12. GRB 140320C: Swift/UVOT Upper Limits
  13. GRB 140320A: Swift-BAT refined analysis
  14. GRB 140320B: Swift/UVOT Upper Limits
  15. GRB 140320A: Swift/UVOT Upper Limits
  16. GRB 140320C: Swift-XRT observations
  17. GRB 140320A: Confirmation of a fading X-ray afterglow
  18. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  19. GRB 140320A: Fermi GBM detection
  20. GRB 140320B: Swift-XRT detection of the afterglow
  21. GRB 140320A: Enhanced Swift-XRT position
  22. GRB 140320A: Swift-XRT detection of an afterglow candidate
  23. Swift Trigger 592558 is not an astrophysical source
  24. GRB 140320A: Fermi GBM observations suggest a short GRB
  25. GRB 140320A: Swift detection of a burst
  26. GRB 140318A: Mondy optical limit
  27. GRB 140318A: Swift/UVOT Upper Limits
  28. GRB 140318A: Swift-BAT refined analysis
  29. GRB 140311B: Mondy optical limit
  30. GRB 140311A: Mondy optical limits
  31. GRB 140318A: Swift-XRT refined Analysis
  32. GRB 140318A: Liverpool Telescope optical observations
  33. GRB 140318A: Enhanced Swift-XRT position
  34. GRB140318A: Discovery Channel Telescope Optical Detection
  35. GRB 140318A: Swift detection of a burst
  36. GRB140308A: Suzaku WAM observation of the prompt emission
  37. GRB 140311C: Swift-XRT and UVOT observations
  38. GRB 140311B: Swift-BAT refined analysis
  39. GRB 140311A: RATIR Optical and NIR Detection
  40. GRB 140311A: Montarrenti Observatory optical upper limit
  41. GRB 140311B: Fermi GBM Detection
  42. GRB 140311A: Swift/UVOT Upper Limits
  43. GRB 140311B: Swift/UVOT Upper Limits
  44. Fermi416242156: possible iPTF counterpart
  45. GRB 140311B: RATIR Optical and NIR Observations
  46. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  47. GRB 140311A: Swift-XRT refined Analysis
  48. GRO J1744-28: Fermi GBM observation
  49. GRB 140302A: GROND confirmation of the afterglow
  50. GRB 140311B: Swift-XRT refined Analysis
  51. GRB 140311A: Swift-BAT refined analysis
  52. GRB 140311A: Enhanced Swift-XRT position
  53. GRB 140311B: Enhanced Swift-XRT position
  54. GRB 140311B: TAROT Calern observatory optical observations
  55. GRB 140311A: Zadko observatory - Gingin optical observations
  56. GRB140311B: Swift/XRT position
  57. GRB 140311B: Swift-XRT observations
  58. GRB 140311B: MASTER early optical observations
  59. GRB 140311A: MASTER early optical observations
  60. GRB 140311B: Swift detection of a burst
  61. GRB 140311A: Swift detection of a probable burst
  62. GRB 140304A: Suzaku WAM observation of the prompt emission
  63. IPN Triangulation of GRB 140308A
  64. IPN Triangulation of GRB 140306A
  65. GRB 140304A: Continued RATIR Optical and NIR Observations
  66. GRB 140305A: Swift-BAT refined analysis
  67. Trigger 590503: Swift-BAT triggered on noise
  68. GRB 140304A: CARMA 3mm detection
  69. GRB 140305A: Swift detection of a burst
  70. GRB 140304A: RATIR g-band Dropout
  71. GRB 140304A: Swift-BAT refined analysis
  72. GRB 140304A: Swift-XRT refined Analysis
  73. GRB 140304A: Enhanced Swift-XRT position
  74. GRB 140304A: Fermi GBM detection
  75. GRB 140304A: 10.4m GTC redshift z = 5.39
  76. GRB 140304A: Swift/UVOT Upper Limits
  77. GRB 140304A: Afterglow decay from Nanshan observations
  78. GRB 140304A: Swift detection of a burst
  79. GRB 140304A: MASTER OT detecton
  80. GRB 140301A: Swift/UVOT Upper Limits
  81. GRB 140302A: Swift/UVOT Upper Limits
  82. GRB140302A: Fermi GBM detection
  83. GRB 140302A: Swift-XRT refined Analysis
  84. GRB 140302A: Swift-BAT refined analysis
  85. GRB 140302A: Enhanced Swift-XRT position
  86. GRB 140301A: Swift-BAT refined analysis
  87. GRB 140301A: Swift-XRT refined Analysis
  88. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  89. GRB 140302A: GROND afterglow candidate
  90. GRB 140302A: Prompt enhanced Swift-XRT position
  91. GRB 140302A: Swift detection of a burst
  92. GRB 140301A: Enhanced Swift-XRT position
  93. GRB 140301A: Skynet R-COP Observations
  94. GRB 140301A: Swift detection of a burst
  95. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  96. GRB 140226A / iPTF14yb: Swift-XRT confirms a fading X-ray source
  97. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb
  98. iPTF14yb: Swift-XRT detection
  99. GRB 140219A: Retraction of X-ray afterglow
  100. GRB 140102A: TAOS early optical afterglow detection

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