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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.

"200205A/SWIFT J0840.7-3516" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

19599 results found.

  1. GRB 170419A: Enhanced Swift-XRT position
  2. Swift Trigger 748858: MASTER-OAFA early optical observations
  3. GRB 170419A: Swift detection of a burst
  4. Swift Trigger 748858: Zadko observatory - Gingin optical observations
  5. Swift Trigger 748858: a possible GRB
  6. GRB 170409A: Fermi-LAT detection
  7. GRB170405A, Swift-UVOT Detection
  8. GRB 170405A, Swift-BAT refined analysis
  9. GRB 170405A: Swift-XRT refined Analysis
  10. GRB 170405A: RATIR Optical and NIR Observations
  11. Konus-Wind observation of GRB 170405A
  12. GRB 170405A: LCO FTN observations
  13. Trigger 745966: Swift detection of 4U1850-03
  14. GRB 170405A: TAROT Reunion observatory optical observations
  15. GRB 170405A: Fermi-LAT detection
  16. GRB 170405A: Fermi GBM observation
  17. GRB 170405A: Enhanced Swift-XRT position
  18. GRB 170405A: Swift detection of a burst with an optical counterpart
  19. GRB 170330A CALET Gamma-Ray Burst Monitor detection
  20. IPN Triangulation of GRB 170403A (short)
  21. Konus-Wind observation of GRB 170330A
  22. Swift Trigger 745090 is a noise trigger near NGC 5195
  23. Swift triggered on SAX J1806.5-221
  24. GRB 170330A: AstroSat CZTI detection
  25. GRB 170330A: Swift-BAT refined analysis
  26. GRB 170331A: Swift-BAT refined analysis
  27. GRB 170331A: Swift/UVOT Upper Limits
  28. IceCube-170321A: Swift-XRT observations
  29. GRB 170330A: Swift-XRT refined Analysis
  30. GRB 170331A: Swift-XRT refined Analysis
  31. GRB 170330A: Enhanced Swift-XRT position
  32. GRB 170331A: Enhanced Swift-XRT position
  33. GRB 170330A: Swift/UVOT Detection of a Fading Afterglow
  34. GRB 170325A: 15 GHz upper limits from AMI
  35. GRB 170318B: 15 GHz upper limits from AMI
  36. GRB 170318A: 15 GHz upper limits from AMI
  37. GRB 170317A: 15 GHz upper limits from AMI
  38. GRB 170330A: LCO Cerro Tololo observations
  39. GRB 170331A: LCO Sutherland observations
  40. GRB 170331A: Prompt enhanced Swift-XRT position
  41. GRB 170331A: Swift detection of a burst
  42. GRB 170330A: Prompt enhanced Swift-XRT position
  43. GRB 170330A: Swift detection of a burst
  44. GRB 170325A: Fermi GBM observation
  45. GRB 170325A, Swift-BAT detection of a short GRB
  46. LIGO/Virgo G275697: AMI Large Array Search for a Radio Afterglow
  47. IPN Triangulation of GRB 170320A (long/intense)
  48. GRB 170318A: KAIT Optical Upper Limit
  49. GRB 170318B: Swift-BAT refined analysis
  50. GRB 170317A: POLAR observation
  51. GRB 170318B: RATIR Optical and NIR Observations
  52. GRB 170317A: RATIR Optical and NIR Observations
  53. GRB 170318B: Swift/UVOT Upper Limits
  54. GRB 170318B: Swift-XRT refined Analysis
  55. GRB 170318A: Swift-XRT refined Analysis
  56. GRB 170318A: RATIR Optical and NIR Observations
  57. GRB 170318A: Swift/UVOT Upper Limits
  58. GRB 170318B: Fermi GBM observation
  59. GRB 170318A: Swift-BAT refined analysis
  60. GRB 170317A: RATIR Optical and NIR Observations
  61. GRB 170318B: Enhanced Swift-XRT position
  62. GRB 170318B: Prompt enhanced Swift-XRT position
  63. GRB 170318B: Swift detection of a burst
  64. GRB 170318A: Enhanced Swift-XRT position
  65. GRB 170318A: Prompt enhanced Swift-XRT position
  66. GRB 170318A: Swift detection of a burst
  67. IceCube-170312A: MASTER follow-up observations
  68. GRB 170317A: LCO FTN observations
  69. GRB 170317A: Swift-BAT refined analysis
  70. GRB 170317A: Swift/UVOT Detection
  71. GRB 170317A: Swift-XRT refined Analysis
  72. IceCube-170312A: Swift-XRT observations
  73. GRB 170317A : Xinglong TNT optical observation
  74. GRB 170317A: Enhanced Swift-XRT position
  75. GRB 170317A: Swift detection of a burst with an optical counterpart
  76. LIGO/Virgo G275697: Swift-XRT source 23 no longer fading
  77. LIGO/Virgo G277583: Swift/BAT data search
  78. GRB 170307A: 15 GHz upper limit from AMI
  79. IPN Triangulation of GRB 170311B (long/very intense)
  80. GRB 170311A: Swift-BAT refined analysis
  81. LIGO/Virgo G275697: GRAWITA NOT optical observations of Swift/XRT Source 23
  82. GRB 170311A: Further GROND analysis
  83. GRB 170311A: Swift-XRT refined Analysis
  84. GRB 170311A: Swift/UVOT Upper Limits
  85. GRB 170311A: Enhanced Swift-XRT position
  86. GRB 170311A: GROND upper limits
  87. GRB 170311A: MASTER-OAFA early optical observations
  88. GRB 170311A: Swift detection of a burst
  89. GRB170306A: SALT observations
  90. GRB 170306A: GROND afterglow detection
  91. LIGO/Virgo G275404: Swift-XRT observations of sources in the AGILE error region
  92. LIGO/Virgo G275697: Swift-XRT source 23 is fading
  93. GRB 170307A (trigger 741528): Swift-BAT refined analysis
  94. GRB 170305A: POLAR observation
  95. Swift trigger 741567: MASTER red star flare detection
  96. GRB 170307A: Fermi GBM observation
  97. Swift Trigger 741528: a possible GRB
  98. GRB 170306B: Swift-XRT observations
  99. GRB 170306A, Swift-BAT refined analysis
  100. GRB 170306A: Swift-XRT refined Analysis

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