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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"

19548 results found.

  1. GRB 190211A: Swift detection of a burst
  2. GRB 190202A: Terskol 2-m optical observations
  3. IPN Triangulation of GRB 190206A (short/extremely bright)
  4. GRB 190203A: Mondy optical observations
  5. GRB190202A: GROWTH-India detection of optical afterglow
  6. GRB 190202A: Xinglong-2.16m optical observations
  7. GRB 190202A: SAO RAS further optical observations
  8. GRB 190204A: SAO RAS optical observations
  9. GRB 190204A: Mondy optical upper limit
  10. GRB190203A: UVOT analysis
  11. GRB 190203A: COATLI Optical Observations
  12. GRB 190204A: Swift/UVOT Detection
  13. GRB 190204A: Enhanced Swift-XRT position
  14. GRB 190204A: COATLI Optical Detection of the Fading Afterglow
  15. GRB 190203A: Liverpool Telescope near-IR observations
  16. GRB 190203A: Swift-XRT refined Analysis
  17. Swift Trigger 887541: MASTER inspect
  18. GRB 190202A: R and I band observation from HCT
  19. GRB 190204A: Swift detection of a burst with a possible optical counterpart
  20. Swift Trigger 887541: Swift detection of Swift J1728.9-3613
  21. GRB 190203A: Enhanced Swift-XRT position
  22. GRB 190203A: SAO RAS optical observations, afterglow fading
  23. GRB 190203A: Koshka Zeiss-1000 optical upper limit
  24. GRB 190203A: Swift detection of a burst with an optical counterpart
  25. GRB 190202A: SAO RAS optical observations
  26. GRB 190202A: TSHAO optical observations
  27. GRB 190202A, Swift-BAT refined analysis
  28. GRB 190202A: AGILE ratemeters detection
  29. GRB 190202A: Swift/UVOT Detection
  30. GRB 190202A: GOTO optical observations
  31. GRB 190202A: Enhanced Swift-XRT position
  32. GRB 190202A: Koshka Zeiss-1000 optical observations
  33. GRB 190202A: Swift detection of a burst with an optical counterpart
  34. GRB 190129B: DDOTI Detection of the Possible Afterglow and Suggestion of Fading
  35. GRB 190129B: Swift/UVOT Upper Limits
  36. GRB 190129B: ePESSTO NTT optical observations
  37. GRB 190129B: MASTER Global Robotic Net optical observation
  38. GRB 190129B: GROND possible host candidate
  39. GRB 190129B: Swift-XRT candidate afterglow detection
  40. GRB 190129B: Tiled Swift observations
  41. Fermi GBM Observations of IceCube-190124A
  42. INTEGRAL observation of IceCube-190124A
  43. Trigger 886496: Another Swift trigger on MAXI J1348-630
  44. Trigger 886486: Swift detection of MAXI J1631-479
  45. Trigger 886266: Another Swift trigger on MAXI J1348-630
  46. GRB 190114C: Optical follow-up from HCT
  47. Swift Trigger 885960: A third Swift trigger on MAXI J1348-630
  48. Trigger 885807: Swift detection of MAXI J1348-630
  49. GRB 190123A: IKI-GRB-FuN optical upper limit
  50. GRB 190123A: NEXT-0.6m optical limit
  51. GRB 190114C: CHILESCOPE optical observations
  52. GRB 190123A: AROMA-N Optical Observation
  53. GRB 190123A: Swift/UVOT Upper Limits
  54. GRB 190123A: COATLI Optical Observations
  55. GRB 190123A: GMG observational limit
  56. Trigger 885456: Swift detection of MAXI J1631-479
  57. GRB 190123A: GOTO optical limit
  58. GRB 190123A: Enhanced Swift-XRT position
  59. GRB 190123A: MASTER Global Robotic Net optical observation
  60. GRB 190123A: Swift detection of a burst
  61. GRB 190122A: Fermi-LAT detection
  62. GRB 190114C: RTT150 optical observations
  63. IPN Triangulation of GRB 190118A (long)
  64. IPN Triangulation of GRB 190117A (long)
  65. Trigger 884906: Swift detection of MAXI J1631-479
  66. GRB 190114C: GMRT detection at 1.26GHz
  67. GRB 190114C: MeerKAT radio observation
  68. GRB 190114C: RATIR Optical and NIR Detections
  69. GRB 190114C: RT-22 detection at 36.8 GHz
  70. GRB 190114C: COATLI Optical Detection
  71. GRB 190114C: continued CHILESCOPE optical obs
  72. GRB190114C: ATCA detection of the radio afterglow
  73. GRB 190114B: continued optical observations in Mondy
  74. GRB 190114C: Optical detection from HCT
  75. GRB 190114C: CHILESCOPE optical observations
  76. GRB190114C: GRowth-India detection of optical afterglow
  77. GRB 190114C: REM optical/NIR detection
  78. GRB 190114C: Mondy optical observations
  79. GRB 190114C: Swift/UVOT Detection
  80. GRB 190114C: Swift-BAT refined analysis
  81. GRB 190114B: Liverpool Telescope near-IR observations
  82. GRB 190114B: optical afterglow observations in Mondy and Abastumani observatories
  83. GRB 190114B: Swift/UVOT Upper Limits
  84. GRB 190114A: Swift/UVOT Observations
  85. GRB 190114A: Mondy optical afterglow detectio
  86. GRB 190114C: Fermi-LAT detection
  87. GRB 190114C: Enhanced Swift-XRT position
  88. GRB 190114C: GROND detection of the afterglow
  89. GRB 190114C: OASDG optical observations
  90. GRB 190114B: Mondy optical afterglow detection
  91. GRB 190114B: Enhanced Swift-XRT position
  92. INTEGRAL observation of IceCube-190104A
  93. GRB 190114C: Swift detection of a very bright burst with a bright optical counterpart
  94. GRB 190114B: Swift detection of a burst
  95. GRB 190103B: Swift/UVOT Upper Limits
  96. GRB 190114A: GROND detection of the afterglow
  97. GRB 190114A: Enhanced Swift-XRT position
  98. GRB 190114A: Swift detection of a burst
  99. Konus-Wind observation of GRB 190110A
  100. Correction to GCN Circular 23663: GRB 190109A: Swift UVOT Upper Limits

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