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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"

14873 results found.

  1. GRB 140927A: Swift detection of a burst
  2. GRB 140919A: Swift/UVOT Detection
  3. GRB 140919A: Swift detection of a burst
  4. GRB 140916B: LOT and iPTF follow-up of optical afterglow candidates
  5. Swift detection of outburst from 4U 1700+24
  6. GRB 140916A: Swift detection of a burst
  7. Possible radio detection of GRB 140903A with the GMRT
  8. GRB 140903A: Chandra detection of the afterglow
  9. GRB 140909A: Swift detection of a GRB
  10. GRB 140907A: Fermi GBM Detection
  11. GRB140907A: Swift UVOT detection
  12. GRB 140906B: Fermi GBM Detection of a Long GRB
  13. GRB 140907A: Swift detection of a burst with an optical counterpart
  14. GRB 140906A - Fermi GBM Detection
  15. GRB 140903A: Confirmation of Optical Fading from Discovery Channel Telescope
  16. GRB 140903A: Possible optical variability
  17. GRB 140903A: 6 GHz VLA detection
  18. GRB 140901B: Fermi GBM detection
  19. GRB140903A: Discovery Channel Telescope Optical Detection
  20. GRB 140903A: Confirmed Swift detection of a short burst
  21. GRB 140903A: Swift detection of a possible burst
  22. GRB 140901A: Fermi GBM detection
  23. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  24. GRB 140829A: Fermi GBM Detection
  25. GRB 140828A: Swift detection of a burst
  26. Fermi TRIGGER_NUM 430645968: MASTER OT inside error box
  27. GRB 140824B: Fermi GBM Detection
  28. GRB 140821A: Fermi GBM Detection
  29. Fermi TRIGGER_NUM 430583595: MASTER OT JR011101.13+603337.5 detection
  30. GRB 140824A: Swift detection of a burst
  31. GRB 140808A/iPTF14eag: AMI 15 GHz detection
  32. GRB140819A: Deep GROND Upper Limits
  33. Konus-Wind observation of GRB 140818A
  34. GRB 140818B: Fermi GBM detection
  35. GRB 140817A: Swift/UVOT Afterglow Detection
  36. GRB 140818B: Swift detection of a burst
  37. GRB 140818A - Fermi GBM Detection
  38. Swift detection of SAX J1712.6-3739
  39. GRB 140818A: Swift-XRT and UVOT potential afterglow detection
  40. GRB 140818A: Correction to GCN 16702
  41. Konus-Wind observation of GRB 140817A
  42. GRB 140818A: MAXI/GSC detection
  43. GRB 140817A: Fermi GBM Detection
  44. GRB 140817A: Swift detection of a burst
  45. Swift Trigger 609694 is probably not an astrophysical source
  46. GRB 140814A: MAXI/GSC detection
  47. GRB 140808A: Confirmation of the Swift-XRT afterglow
  48. Konus-Wind observation of GRB 140810A
  49. GRB140810A: Fermi-LAT detection
  50. GRB 140809A (FERMI trigger 429246673): MASTER follow-up inspection
  51. Konus-Wind observation of GRB 140808A
  52. GRB 140808A: Swift-XRT observations
  53. GRB 140808A: Fermi GBM detection
  54. GRB 140808A: optical afterglow candidate iPTF14eag
  55. GRB 140801A: GROND Afterglow detection, unbroken decay
  56. Konus-Wind observation of GRB 140801A
  57. GRB 140801A (FERMI trigger 428612396): MASTER brigth OT discovery
  58. Konus-Wind observation of GRB 140729A
  59. GRB 140730A: Swift detection of a burst
  60. Swift Trigger 607506 is probably noise
  61. GRB 140729A: Fermi-GBM detection
  62. GRB 140729A: Fermi-LAT detection
  63. Trigger 607399: Swift detection of SGR1806-20
  64. Konus-Wind observation of GRB 140723A
  65. GRB 140723A: Fermi GBM detection
  66. GRB 140723A: Fermi-LAT detection
  67. Konus-Wind observation of GRB 140721A
  68. GRB 140721A: Fermi GBM detection
  69. GRB 140716A: Confirmation of the Swift-XRT afterglow
  70. GRB 140719B: Swift detection of a burst
  71. GRB 140719A: Swift detection of a burst
  72. GRB 140713A: AMI 15 GHz detection
  73. GRB 140713A: 10.4-m GTC deep optical observation
  74. GRB 140716A: Swift-XRT detection of an afterglow candidate
  75. GRB 140716A: A Fermi GBM Detection
  76. Swift observations of a flare from UX Ari
  77. GRB 140709A: Possible AMI 15 GHz detection
  78. Swift detection of UX Ari
  79. GRB 140713A: CARMA mm detection
  80. GRB 140714A: Fermi GBM detection
  81. GRB 140713A: Fermi GBM detection
  82. GRB 140713A: Swift detection of a burst
  83. GRB 140710B: Fermi GBM detection
  84. GRB 140710A: GROND Detection of NIR Afterglow Candidate
  85. GRB 140710A: Swift detection of a burst
  86. GRB 140709B: Fermi GBM detection
  87. GRB 140709B: OSN optical limit
  88. GRB 140709A: Fermi GBM detection
  89. GRB 140709A: BOOTES-2 and OSN optical observations
  90. GRB 140709B: Swift detection of a burst
  91. GRB 140709A: Swift detection of a burst
  92. GRB 140703A: AMI 15 GHz detection
  93. GRB 140706A: Swift/UVOT Detection
  94. GRB 140706A: Fermi GBM detection
  95. GRB140706A: GROND detection of the Optical/NIR afterglow
  96. GRB 140706A: Swift detection of a burst with an optical counterpart
  97. GRB 140705A: Swift detection of a short burst
  98. GRB 140621A: Suzaku WAM observation of the prompt emission
  99. GRB 140703A: VLA K-band detection
  100. GRB 140703A: CARMA 3mm detection

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