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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"

14929 results found.

  1. Konus-Wind observation of GRB 141102A
  2. GRB 141102A: Fermi-LAT detection
  3. GRB 141102A: Fermi GBM detection
  4. GRB 141026A: VLA observations
  5. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  6. GRB 141031A: Fermi GBM detection
  7. GRB 141031B: Swift detection of a burst
  8. GRB 141031A: GROND detection of a possible optical afterglow candidate
  9. GRB 141031A: Swift detection of a burst
  10. GRB 140509A: GROND afterglow detection
  11. GRB 141029B: Fermi GBM detection
  12. GRB 141028A: LCOGTN observations
  13. GRB 141029A: MAXI/GSC detection
  14. GRB 141028A: Swift/UVOT Detection
  15. GRB 141028A: Swift/XRT detection of the X-ray afterglow
  16. GRB 141028A: GROND Afterglow confirmation (MASTER source)
  17. GRB 141026A: IRAM 30m millimetre observations
  18. GRB 141028A: MASTER OT candidate detection
  19. GRB 141028A: Fermi GBM detection
  20. GRB 141028A: Fermi-LAT detection
  21. GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection
  22. GRB 141026A: P60 early observations
  23. GRB 141026A: Swift detection of a burst
  24. GRB141022A: Fermi GBM Detection
  25. GRB141022B: Fermi GBM Detection
  26. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate
  27. GRB 141022A: Swift detection of a burst
  28. GRB 141004A: RATIR Late Time Optical and NIR Observations
  29. GRB 141020A: Swift/UVOT Detection
  30. GRB 141020B: MAXI/GSC detection
  31. GRB 141020A: Swift detection of a burst with an optical counterpart
  32. GRB 141017A: GROND Afterglow Confirmation
  33. GRB 141017A: Swift/UVOT Detection
  34. GRB 141017A: Swift detection of a burst
  35. GRB 141015A: Swift detection of a burst
  36. Konus-Wind observation of GRB 141011A
  37. GRB 141011A: Fermi GBM detection
  38. Trigger 614903: Swift detection of IGR J17544-2619
  39. GRB141004A: Host galaxy redshift form GTC
  40. Konus-Wind observation of GRB 141005A
  41. GRB 141004A: Swift/UVOT Detection
  42. GRB 141005A: Fermi GBM Detection
  43. GRB 141005A: Swift detection of a burst
  44. GRB 141004A: TNG photometric and spectroscopic observations
  45. GRB 141004A: Swift detection of a burst with an optical counterpart
  46. Swift observations of HD 305560
  47. GRB 140930B: MASTER early possible OT detection
  48. Swift possible detection of the Be star HD 305560
  49. Konus-Wind observation of GRB 140930B
  50. GRB 140928A: MAXI-GSC detection
  51. GRB 140930B: WHT detection of candidate afterglow
  52. GRB 140930B: Swift detection of a short burst
  53. GRB 140930A/MAXI J2259+524: MAXI-GSC detection
  54. Konus-Wind observation of GRB 140928A
  55. GRB 140928A: Fermi GBM detection
  56. GRB 140928A: Fermi-LAT detection
  57. GRB 140927A: Swift detection of a burst
  58. GRB 140919A: Swift/UVOT Detection
  59. GRB 140919A: Swift detection of a burst
  60. GRB 140916B: LOT and iPTF follow-up of optical afterglow candidates
  61. Swift detection of outburst from 4U 1700+24
  62. GRB 140916A: Swift detection of a burst
  63. Possible radio detection of GRB 140903A with the GMRT
  64. GRB 140903A: Chandra detection of the afterglow
  65. GRB 140909A: Swift detection of a GRB
  66. GRB 140907A: Fermi GBM Detection
  67. GRB140907A: Swift UVOT detection
  68. GRB 140906B: Fermi GBM Detection of a Long GRB
  69. GRB 140907A: Swift detection of a burst with an optical counterpart
  70. GRB 140906A - Fermi GBM Detection
  71. GRB 140903A: Confirmation of Optical Fading from Discovery Channel Telescope
  72. GRB 140903A: Possible optical variability
  73. GRB 140903A: 6 GHz VLA detection
  74. GRB 140901B: Fermi GBM detection
  75. GRB140903A: Discovery Channel Telescope Optical Detection
  76. GRB 140903A: Confirmed Swift detection of a short burst
  77. GRB 140903A: Swift detection of a possible burst
  78. GRB 140901A: Fermi GBM detection
  79. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  80. GRB 140829A: Fermi GBM Detection
  81. GRB 140828A: Swift detection of a burst
  82. Fermi TRIGGER_NUM 430645968: MASTER OT inside error box
  83. GRB 140824B: Fermi GBM Detection
  84. GRB 140821A: Fermi GBM Detection
  85. Fermi TRIGGER_NUM 430583595: MASTER OT JR011101.13+603337.5 detection
  86. GRB 140824A: Swift detection of a burst
  87. GRB 140808A/iPTF14eag: AMI 15 GHz detection
  88. GRB140819A: Deep GROND Upper Limits
  89. Konus-Wind observation of GRB 140818A
  90. GRB 140818B: Fermi GBM detection
  91. GRB 140817A: Swift/UVOT Afterglow Detection
  92. GRB 140818B: Swift detection of a burst
  93. GRB 140818A - Fermi GBM Detection
  94. Swift detection of SAX J1712.6-3739
  95. GRB 140818A: Swift-XRT and UVOT potential afterglow detection
  96. GRB 140818A: Correction to GCN 16702
  97. Konus-Wind observation of GRB 140817A
  98. GRB 140818A: MAXI/GSC detection
  99. GRB 140817A: Fermi GBM Detection
  100. GRB 140817A: Swift detection of a burst

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