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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"

6667 results found.

  1. GRB 140611A: Swift-XRT observations
  2. GRB 140610A: Swift-XRT refined Analysis
  3. GRB 140606B / iPTF 14bfu: MOSFIRE NIR imaging
  4. GRB 140610A: Fermi GBM Detection
  5. GRB 140606B: Swift XRT refined analysis
  6. GRB 140606B: Swift/UVOT Upper Limits
  7. GRB 140606B: Swift XRT position
  8. GRB 140606B: Fermi GBM detection
  9. GRB 140606A: Swift-XRT upper limits
  10. GRB 140523A: further Swift-XRT observations
  11. GRB 140528A: Fermi GBM Detection
  12. GRB 140529A: Swift-XRT afterglow detection.
  13. Chandra late-time observations of GRB140515A
  14. GRB 140523A: possible X-ray afterglow candidate from tiled Swift/XRT observations
  15. GRB 140523A: Fermi-LAT detection
  16. GRB 140523A: Fermi GBM detection
  17. GRB 140423A: TShAO optical observations
  18. GRB 140516A: further Swift-XRT analysis
  19. GRB 140518A: T100 observations
  20. GRB 140518A: Swift-XRT refined Analysis
  21. GRB 140516A: Swift-XRT refined Analysis
  22. GRB 140515A: Swift-XRT refined Analysis
  23. GRB 140423A: HCT optical observations
  24. GRB 140512A: Fermi GBM detection
  25. GRB 140512A: Swift-XRT refined Analysis
  26. Swift Observations of GRB 140508A
  27. GRB 140509A: Swift-XRT refined Analysis
  28. GRB 140508A: Optical Observations via Virtual Telescope
  29. GRB 140508A: Swift-XRT observations
  30. GRB 140508A: Fermi GBM detection
  31. GRB 140506A: Fermi GBM Detection
  32. GRB 140506A: Swift-XRT refined Analysis
  33. GRB 140502A: Swift-XRT refined Analysis
  34. GRB 140502A: Fermi GBM observation
  35. GRB 140501A: Fermi GBM detection
  36. GRB 140430A: Swift-XRT refined Analysis
  37. GRB 140428B: Fermi GBM observation
  38. GRB 140423A: RTT150 optical observations
  39. GRB 140423A: Nishi-Harima NIR Observations
  40. GRB 140423A, Optical Observations
  41. GRB 140423A: Swift-XRT refined Analysis
  42. GRB 140423A: Fermi GBM observation
  43. GRB 140423A: KWFC z-band photometry
  44. GRB 140419A: Continued RATIR Optical and NIR Observations
  45. GRB 140419A, Optical Observations
  46. GRB 140419A: Swift-XRT refined Analysis
  47. GRB 140419A: T24 optical observations
  48. GRB 140416A: Fermi GBM detection
  49. GRB 140414A: Swift/UVOT Upper Limit
  50. GRB 140414A: Swift-XRT observations
  51. GRB 140413A: Swift-XRT refined Analysis
  52. GRB 140412A: Swift-XRT refined Analysis
  53. Swift Trigger 595345 is not an astrophysical source
  54. GRB 140408A: Swift-XRT refined Analysis
  55. GRB 140408A: Fermi GBM detection
  56. GRB 140406A: Fermi GBM observation
  57. GRB 140402A: Swift-XRT observations
  58. GRB 140402A : Xinglong TNT upper limit
  59. GRB 140402A: Fermi GBM detection
  60. GRB 140402A: Fermi-LAT detection of a burst
  61. Swift trigger 594286: Is likely a noise trigger
  62. GRB 140330A: Fermi GBM observation
  63. GRB 140331A: Swift-XRT refined Analysis
  64. Retraction of the Fermi/LAT high-energy counterpart for GRB 140330A
  65. GRB 140330A: Fermi-LAT Detection
  66. GRB 140329A: Fermi-LAT detection
  67. GRB 140329A: Fermi GBM observation of a bright burst
  68. GRB 140323A: Fermi-LAT detection
  69. GRB 140323A: Swift-XRT refined Analysis
  70. GRB 140323A: Fermi GBM observation
  71. GRB 140320C: Swift-XRT observations
  72. GRB 140320A: Confirmation of a fading X-ray afterglow
  73. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  74. GRB 140320A: Fermi GBM detection
  75. GRB 140320B: Swift-XRT detection of the afterglow
  76. GRB 140320A: Swift-XRT detection of an afterglow candidate
  77. GRB 140320B: ISON-NM optical observations
  78. Swift Trigger 592558 is not an astrophysical source
  79. GRB 140318A: Swift-XRT refined Analysis
  80. GRB 140318A: NOT detection of the afterglow
  81. GRB 140311C: Swift-XRT and UVOT observations
  82. GRB 140311C: Fermi GBM Detection
  83. GRB 140311B: Fermi GBM Detection
  84. GRB 140311A: Swift-XRT refined Analysis
  85. GRO J1744-28: Fermi GBM observation
  86. GRB 140311B: Swift-XRT refined Analysis
  87. GRB 140311B: final MASTER OT light curve
  88. GRB 140311A: Optical follow-up observation with Kottamia 188cm telescope
  89. GRB 140306A: Fermi GBM detection
  90. GRB 140304A: Swift-XRT refined Analysis
  91. GRB 140304A: Fermi GBM detection
  92. GRB140302A: Fermi GBM detection
  93. GRB 140302A: Swift-XRT refined Analysis
  94. GRB 140301A: Swift-XRT refined Analysis
  95. iPTF14yb: Swift-XRT detection
  96. GRB 140219A: XRT afterglow candidate
  97. GRB 140221A: Results from Swift XRT tiled observations
  98. GRB 140219A: results from Swift XRT and UVOT tiled observations
  99. GRB 140219A: Fermi-LAT detection of a burst
  100. GRB 140219A: Fermi GBM Detection

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