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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"

6828 results found.

  1. GRB 150407A: Swift-XRT observations
  2. GRB 150404A: Fermi GBM detection
  3. GRB 150403A: Fermi GBM Detection
  4. GRB 150403A: Swift-XRT refined Analysis
  5. GRB 150403A: Fermi-LAT detection
  6. GRB 150402A: results of Swift observations
  7. GRB 150330A: Fermi GBM detection
  8. GRB 150323B: Swift-XRT afterglow detection
  9. GRB 150323C: Nishi-Harima NIR Observations
  10. GRB 150323B: Swift-XRT observations
  11. GRB 150323C: Swift-XRT refined Analysis
  12. GRB150323C: Fermi GBM detection
  13. GRB 150323B: Fermi GBM observation
  14. GRB 150323A: Swift-XRT refined Analysis
  15. GRB 150318A: Swift-XRT refined Analysis
  16. GRB 150318A: Swift/UVOT Upper Limits
  17. GRB 150317A: Swift-XRT refined Analysis
  18. GRB 150317A: NOT optical observations
  19. GRB 150314A: Swift-XRT refined Analysis
  20. GRB 150314A: Fermi GBM observation
  21. GRB 150314A: Fermi-LAT detection
  22. GRB 150309A: Fermi GBM detection
  23. GRB 150309A: Swift-XRT refined Analysis
  24. Chandra X-ray observations of SWIFT J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka p[PFH2005] 622)
  25. Further UVOT Observations of Swift J0045.2+4151
  26. Further X-ray observations of Swift J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka [PFH2005] 622)
  27. GRB 150301C: XRT detection of a potential counterpart of BAT trigger 633105
  28. GRB 150302A: Swift-XRT refined Analysis
  29. GRB 150301B: Swift-XRT refined Analysis
  30. GRB 150301B: Fermi GBM detection
  31. GRB 150301A: Swift-XRT refined Analysis
  32. GRB 150301C : (Swift trigger 633105) Swift observations
  33. GRB 150301A: Fermi GBM observation
  34. GRB 150220A: Fermi GBM observation
  35. GRB 150220A: Swift-XRT observations
  36. GRB 150222A: Swift-XRT refined Analysis
  37. GRB 150219A: Fermi GBM observation
  38. GRB 150219A: Swift-XRT afterglow detection
  39. GRB 150213B: Swift-BAT refined analysis
  40. GRB 150213B: Swift-XRT refined Analysis
  41. GRB 150213A: Fermi GBM detection
  42. GRB 150212A: Swift-XRT refined Analysis
  43. GRB 150210A: Swift-XRT observations
  44. GRB 150211A: Swift-XRT refined Analysis
  45. GRB 150210A: Fermi-LAT detection
  46. GRB 150210A: Fermi GBM detection
  47. GRB 150101B/ Swift J123205.1-105602: Second epoch Chandra observations
  48. GRB 150202B: Swift/XRT afterglow confirmation
  49. GRB 150204A: Swift/XRT afterglow confirmation
  50. GRB 150206A: Swift-XRT refined Analysis
  51. GRB 150206B: Fermi GBM detection
  52. GRB 150204A: Swift-XRT observations
  53. GRB 150204A: Fermi GBM detection
  54. GRB 150202B: Swift XRT/UVOT observations
  55. Swift Trigger 629693 was a noise event
  56. GRB 150203A: Swift-XRT refined Analysis
  57. GRB 150202A: Swift-XRT refined Analysis
  58. GRB 150203A: Fermi GBM observation
  59. GRB 150202B: Fermi GBM detection
  60. GRB 150202B: Fermi-LAT detection
  61. GRB 150201A: Swift-XRT refined Analysis
  62. GRB 150201A: Fermi GBM observation
  63. GRB 150127B: Fermi GBM detection
  64. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  65. GRB 150127A: Fermi-LAT detection
  66. GRB150127A: Fermi GBM Detection
  67. GRB 150126A: Fermi GBM Detection
  68. GRB 150123A: Swift-XRT observations
  69. GRB 150120B: Additional P60 observations
  70. GRB 150120A: Swift-XRT refined Analysis
  71. GRB 150118C: Fermi GBM Detection
  72. GRB 150120B: Swift-XRT refined Analysis
  73. GRB 150120A: Fermi GBM observation
  74. GRB 150101B/Swift J123205.1-105602: XMM-Newton observation
  75. GRB 150118B: Fermi GBM Detection
  76. GRB 150118B: Fermi-LAT detection
  77. GRB 150110C: Swift-XRT observations
  78. GRB 150110B: Swift-XRT refined Analysis
  79. GRB 150110B: Fermi GBM Detection
  80. GRB 150110A: Fermi GBM Detection
  81. GRB 150101B/Swift J123205.1-105602: Chandra observations
  82. GRB 150105A: Fermi GBM detection
  83. GRB 150103A: Swift-XRT refined Analysis
  84. GRB 150101B: Fermi GBM detection
  85. Swift J123205.1-105602: XRT and UVOT observations of soft short burst source
  86. GRB 150101A: Fermi GBM detection
  87. GRB 150101A: Swift-XRT refined Analysis
  88. Swift-XRT and UVOT follow-up of iPTF14jko (GRB 141230A)
  89. GRB 141230A: Fermi GBM detection
  90. GRB 141229A: Swift-XRT observations
  91. GRB 141229A: Fermi GBM detection
  92. GRB 141225A: MASTER-SAAO OT light curve
  93. GRB 141225A: Fermi GBM detection
  94. GRB 141225A: Swift-XRT refined Analysis
  95. Swift XRT and UVOT observations of GRB141222A
  96. GRB 141222A: Fermi GBM detection
  97. GRB 141222A: Fermi-LAT detection
  98. GRB 141215A: further Swift-XRT observations and afterglow detection
  99. GRB 141221A: Fermi GBM observation
  100. GRB 141221A: Swift-XRT refined Analysis

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Download all Circulars as a .tar.gz archive (updated once a day):
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