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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"

14865 results found.

  1. GRB 141212B: Swift detection of a burst
  2. GRB 141212A: Swift detection of a short burst
  3. GRB 141207A: Swift-XRT afterglow candidate detection
  4. Konus-Wind observation of GRB 141207A
  5. GRB141208.63: MASTER OT Detection During the Fermi Error Box inspection
  6. GRB 141207A: Swift-UVOT Observations
  7. GRB 141207A: Fermi GBM detection
  8. GRB 141207A: Swift-XRT observations
  9. GRB 141207A: Fermi-LAT Detection
  10. GRB 141205A: Fermi GBM detection
  11. GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
  12. Konus-Wind observation of GRB 141202A
  13. GRB 141202A: Fermi GBM Detection
  14. GRB 141130A: Swift/UVOT Detection
  15. GRB 141121A: VLA radio detection
  16. GRB 141130A: Swift detection of a burst with an optical counterpart
  17. GRB 141121A: SPI-ACS/INTEGRAL observations
  18. Konus-Wind observation of GRB 141121A
  19. GRB 141121A: WSRT radio detection
  20. GRB 141121A: AMI 15 GHz detection
  21. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  22. GRB 141118A: Fermi GBM Detection
  23. GRB 141121A: MAXI/GSC detection
  24. GRB141121A: BOOTES-2/TELMA upper limit
  25. GRB 141121A: Swift detection of a burst
  26. GRB 141104A: further Swift-XRT observations and afterglow candidate
  27. GRB 141109A: VLA detection
  28. Trigger 618634: Swift detection of Vela X-1
  29. Swift Trigger 618402: probable noise event
  30. GRB 141109A: Swift/UVOT Detection
  31. GRB 141109B: IRAM 30m millimetre observations
  32. GRB 141109B: BOOTES-4 and TERSKOL optical upper limit
  33. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  34. GRB 141109A: REM NIR candidate afterglow
  35. GRB 141109B: Swift detection of a burst
  36. GRB 141109A: Swift detection of a burst
  37. Konus-Wind observation of GRB 141102A
  38. GRB 141102A: Fermi-LAT detection
  39. GRB 141102A: Fermi GBM detection
  40. GRB 141026A: VLA observations
  41. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  42. GRB 141031A: Fermi GBM detection
  43. GRB 141031B: Swift detection of a burst
  44. GRB 141031A: GROND detection of a possible optical afterglow candidate
  45. GRB 141031A: Swift detection of a burst
  46. GRB 140509A: GROND afterglow detection
  47. GRB 141029B: Fermi GBM detection
  48. GRB 141028A: LCOGTN observations
  49. GRB 141029A: MAXI/GSC detection
  50. GRB 141028A: Swift/UVOT Detection
  51. GRB 141028A: Swift/XRT detection of the X-ray afterglow
  52. GRB 141028A: GROND Afterglow confirmation (MASTER source)
  53. GRB 141026A: IRAM 30m millimetre observations
  54. GRB 141028A: MASTER OT candidate detection
  55. GRB 141028A: Fermi GBM detection
  56. GRB 141028A: Fermi-LAT detection
  57. GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection
  58. GRB 141026A: P60 early observations
  59. GRB 141026A: Swift detection of a burst
  60. GRB141022A: Fermi GBM Detection
  61. GRB141022B: Fermi GBM Detection
  62. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate
  63. GRB 141022A: Swift detection of a burst
  64. GRB 141004A: RATIR Late Time Optical and NIR Observations
  65. GRB 141020A: Swift/UVOT Detection
  66. GRB 141020B: MAXI/GSC detection
  67. GRB 141020A: Swift detection of a burst with an optical counterpart
  68. GRB 141017A: GROND Afterglow Confirmation
  69. GRB 141017A: Swift/UVOT Detection
  70. GRB 141017A: Swift detection of a burst
  71. GRB 141015A: Swift detection of a burst
  72. Konus-Wind observation of GRB 141011A
  73. GRB 141011A: Fermi GBM detection
  74. Trigger 614903: Swift detection of IGR J17544-2619
  75. GRB141004A: Host galaxy redshift form GTC
  76. Konus-Wind observation of GRB 141005A
  77. GRB 141004A: Swift/UVOT Detection
  78. GRB 141005A: Fermi GBM Detection
  79. GRB 141005A: Swift detection of a burst
  80. GRB 141004A: TNG photometric and spectroscopic observations
  81. GRB 141004A: Swift detection of a burst with an optical counterpart
  82. Swift observations of HD 305560
  83. GRB 140930B: MASTER early possible OT detection
  84. Swift possible detection of the Be star HD 305560
  85. Konus-Wind observation of GRB 140930B
  86. GRB 140928A: MAXI-GSC detection
  87. GRB 140930B: WHT detection of candidate afterglow
  88. GRB 140930B: Swift detection of a short burst
  89. GRB 140930A/MAXI J2259+524: MAXI-GSC detection
  90. Konus-Wind observation of GRB 140928A
  91. GRB 140928A: Fermi GBM detection
  92. GRB 140928A: Fermi-LAT detection
  93. GRB 140927A: Swift detection of a burst
  94. GRB 140919A: Swift/UVOT Detection
  95. GRB 140919A: Swift detection of a burst
  96. GRB 140916B: LOT and iPTF follow-up of optical afterglow candidates
  97. Swift detection of outburst from 4U 1700+24
  98. GRB 140916A: Swift detection of a burst
  99. Possible radio detection of GRB 140903A with the GMRT
  100. GRB 140903A: Chandra detection of the afterglow

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