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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"

41682 results found.

  1. GRB 140730A: Swift detection of a burst
  2. Radio upper limit on the GRB 140713A with the GMRT
  3. GRB 140729A: iPTF optical upper limit
  4. Swift Trigger 607506 is probably noise
  5. GRB 140729A: Swift-XRT and UVOT observations
  6. IPN Triangulation of GRB 140729A
  7. GRB 140729A: Fermi-GBM detection
  8. Correction to Fermi-LAT GCN Circular 16633
  9. GRB 140729A Tiled Swift observations
  10. GRB 140729A: Fermi-LAT detection
  11. Trigger 607399: Swift detection of SGR1806-20
  12. GRB 140723A: Swift-XRT and UVOT observations
  13. GRB 140723A: LCO-Sutherland optical candidate retraction
  14. GRB 140723A: MASTER optical observation
  15. Konus-Wind observation of GRB 140723A
  16. GRB 140723A: LCO-Sutherland optical candidate
  17. GRB 140723A: Fermi GBM detection
  18. IPN Triangulation of GRB 140723A
  19. GRB 140723A Tiled Swift observations
  20. GRB 140723A: Fermi-LAT detection
  21. GRB 140709B: Swift/UVOT Upper Limits
  22. Konus-Wind observation of GRB 140721A
  23. IPN Triangulation of GRB 140721A
  24. GRB 140719B: Swift XRT observation
  25. GRB 140719A: Swift/UVOT Upper Limits
  26. GRB 140721A: Fermi GBM detection
  27. GRB 140716A: Confirmation of the Swift-XRT afterglow
  28. GRB 140719B, Swift-BAT refined analysis
  29. GRB 140716A: GROND confirmation of the afterglow
  30. GRB 140719A, Swift-BAT refined analysis
  31. GRB 140719A: FTS observations
  32. GRB 140719A: GROND Afterglow candidate
  33. GRB 140719B: Zadko observatory - Gingin optical observations
  34. GRB 140719B: Swift detection of a burst
  35. GRB 140719A: Swift-XRT refined Analysis
  36. GRB 140719A: Swift detection of a burst
  37. Konus-Wind observation of GRB 140716A
  38. GRB 140716A: Swift/UVOT Upper Limits
  39. GRB 140713A: AMI 15 GHz detection
  40. GRB 140713A: 10.4-m GTC deep optical observation
  41. GRB 140716A: GROND afterglow candidate
  42. GRB 140716A: Swift-XRT detection of an afterglow candidate
  43. GRB 140716A: A Fermi GBM Detection
  44. GRB 140716A BAT refined analysis
  45. Swift observations of a flare from UX Ari
  46. GRB 140716A found in ground analysis of Swift-BAT data
  47. GRB 140709A: Possible AMI 15 GHz detection
  48. Swift detection of UX Ari
  49. GRB 140713A: CARMA mm detection
  50. GRB 140714A: Fermi GBM detection
  51. Radio upper limits on the GRB 140703A with the GMRT
  52. GRB 140713A: Fermi GBM detection
  53. GRB 140713A: Swift-XRT refined Analysis
  54. GRB 140713A: Swift/UVOT Upper Limits
  55. GRB 140713A: NOT upper limits
  56. GRB 140713A : Xinglong TNT upper limit
  57. GRB 140713A: Swift-BAT refined analysis
  58. GRB 140713A: T100 observations
  59. GRB 140710A: iTelescope.Net T11 Optical Observation
  60. GRB 140713A: Swift detection of a burst
  61. Swift Trigger 604111 is not a GRB
  62. GRB 140710B: Fermi GBM detection
  63. GRB 140710B: improved INTEGRAL position
  64. Fermi GBM Observations of SGR 1935+2154
  65. GRB 140710B: a long GRB detected with INTEGRAL
  66. GRB 140709A: Continued RATIR Optical and NIR Observations
  67. GRB 140710A: Swift-XRT refined Analysis
  68. GRB 140710A: Swift-BAT refined analysis
  69. GRB 140710A: Swift/UVOT Upper Limits
  70. GRB 140709B: update of Khureltogot optical upper limit
  71. GRB 140710A: Gemini-N redshift of likely host
  72. GRB 140710A: RATIR Optical and NIR Observations
  73. GRB 140710A: P60 Confirmation of Afterglow
  74. GRB 140710A: correction to GCN #16565
  75. GRB 140710A: GROND Detection of NIR Afterglow Candidate
  76. GRB 140709A: 10.4m GTC optical decay
  77. GRB 140710A: Swift detection of a burst
  78. GRB 140709B: Swift-XRT refined Analysis
  79. GRB 140709B: Fermi GBM detection
  80. GRB 140709B: Swift-BAT refined analysis
  81. GRB 140709A : Virtual Telescope optical observations
  82. GRB 140709B: Khureltogot optical upper limit
  83. GRB 140709A: Fermi GBM detection
  84. GRB 140709A: BOOTES-2 and OSN optical observations
  85. GRB 140709A, Swift-BAT refined analysis
  86. GRB 140709B: MASTER optical observation
  87. GRB 140709B: Swift detection of a burst
  88. GRB 140709A: Swift-XRT refined Analysis
  89. GRB 140709A: Swift/UVOT Upper Limits
  90. GRB 140709A: RATIR Optical and NIR Observations
  91. GRB 140709A: Swift detection of a burst
  92. Fermi GBM trigger 140708682 is not a GRB
  93. GRB 140705A: Nishi-Harima NIR upper limits
  94. GRB 140703A: AMI 15 GHz detection
  95. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  96. GRB 140706A: Swift/UVOT Detection
  97. GRB 140703A: Swift/UVOT Upper Limits
  98. GRB 140706A: Swift-BAT refined analysis
  99. GRB 140706A: Swift-XRT refined Analysis
  100. GRB 140706A: Fermi GBM detection

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