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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"

19666 results found.

  1. Konus-Wind observation of GRB 190110A
  2. GRB 190110A, Swift-BAT refined analysis
  3. Correction to GCN Circular 23663: GRB 190109A: Swift UVOT Upper Limits
  4. GRB 190110A: Fermi GBM detection
  5. GRB 190110A: Swift detection of a burst
  6. GRB 190109B: Fermi GBM observation
  7. GRB 190106A: OSN Afterglow Observations
  8. GRB 190109B: Swift/UVOT Upper Limits
  9. GRB 190109A: Swift/UVOT Upper Limits
  10. GRB 190109B: Swift-XRT refined Analysis
  11. GRB 190109B: Swift-BAT refined analysis
  12. GRB 190109A: Fermi GBM observation
  13. GRB 190109B: BOOTES-5/JGT optical observations
  14. GRB 190109B: Mondy optical upper limit
  15. GRB 190109A: Swift-BAT refined analysis
  16. GRB 190109B: Enhanced Swift-XRT position
  17. GRB 190109B: Swift-XRT observations
  18. GRB 190109B: Swift detection of a burst
  19. IPN triangulation of GRB 190103A (long)
  20. GRB 190109A: Swift-XRT refined Analysis
  21. GRB 190109A: Enhanced Swift-XRT position
  22. GRB 190109A: Prompt enhanced Swift-XRT position
  23. GRB 190109A: Swift detection of a burst
  24. IceCube-190104A: Swift-XRT observations
  25. Trigger 882561: Swift detection of MAXI J1631-479
  26. Konus-Wind observation of GRB 190106A
  27. GRB 190106A: Swift-XRT refined Analysis
  28. GRB 190103B: CALET Gamma-Ray Burst Monitor detection
  29. GRB 190106A: BOOTES-4/MET optical observations
  30. GRB 190106A: Swift/UVOT Detection
  31. GRB 190106A: Swift-BAT refined analysis
  32. GRB 190106A: Bassano Bresciano Observatory optical detection
  33. GRB 190106A: Enhanced Swift-XRT position
  34. GRB 190106A: MITSuME Akeno optical observation
  35. GRB 190106A: MASTER Amur OT detection
  36. GRB 190106A: Swift detection of a burst with an optical counterpart
  37. SWIFT GRB190106.57 Global MASTER-Net OT detection
  38. Konus-Wind observation of GRB 190103B
  39. GRB 190103B: Bassano Bresciano observatory upper limit
  40. GRB 190103B: Swift-BAT refined analysis
  41. GRB 190103B: Swift-XRT refined Analysis
  42. GRB 190103B: Enhanced Swift-XRT position
  43. GRB 190103B: Swift detection of a burst
  44. GRB 181231A: Fermi-LAT detection
  45. GRB 181225A: further Swift-XRT observations
  46. GRB 181228A: Global MASTER Net OT is the same REM IR transient
  47. Swift Trigger 880127 is not a GRB
  48. GRB 181228A: Swift-XRT refined Analysis
  49. GRB 181228A: Swift-BAT refined analysis
  50. GRB 181222B: Swift follow-up observations of MASTER optical transient J204928.79+245744.0
  51. GRB 181228A: Swift/UVOT Upper Limits
  52. GRB 181228A: Fermi GBM observation
  53. IPN Triangulation of GRB 181227A (long)
  54. GRB 181228A: Global MASTER Net OT detection
  55. GRB 181228A: Enhanced Swift-XRT position
  56. GRB 181228A: KAIT Optical Upper Limit
  57. GRB 181228A: Swift detection of a burst
  58. GRB 181222B: Swift ToO observations
  59. GRB 181225A: Swift observations and X-ray candidate afterglow
  60. GRB 181225A: Swift ToO observations
  61. GRB 181225A: Fermi-LAT Detection
  62. GRB 181224A: Swift-BAT refined analysis
  63. GRB 181224A: Swift detection of a burst
  64. Trigger 878548: Swift detection of AX 1631.9-4752
  65. Swift Trigger 878504 is not astrophysical
  66. GRB 181213A: Swift/UVOT Observations
  67. GRB 181213A:Insight-HXMT/HE detection
  68. GRB 181213A: HMM-0.5m, NEXT-0.6m, CNEOST-1m optical observations
  69. GRB 181213A: Swift-XRT refined Analysis
  70. GRB 181213A: Enhanced Swift-XRT position
  71. IPN Triangulation of GRB 181212A (long)
  72. GRB 181213A: Swift-BAT refined analysis
  73. GRB181213A: Swift/UVOT Detection
  74. GRB 181213A: Swift-XRT observations
  75. GRB 181213A: BOOTES-5/JGT optical observations
  76. SWIFT GRB181213A Global MASTER-Net bright OT discovery
  77. GRB 181213A: Swift detection of a burst
  78. GRB 181203A: GROND detection of the afterglow
  79. GRB 181203A: BOOTES-3/YA optical observations
  80. Swift Trigger 874754 is likely not an astrophysical event
  81. GRB 181203A: Swift/UVOT Upper Limits
  82. GRB 181203A: Swift-XRT refined Analysis
  83. GRB 181203A: Swift-BAT refined analysis
  84. GRB 181201A: Swift/UVOT Detection
  85. GRB 181202A: Swift/UVOT Detection
  86. GRB 181202A: RATIR Optical and NIR Observations
  87. GRB 181203A: Enhanced Swift-XRT position
  88. GRB 181203A: Swift detection of a burst
  89. GRB 181202A: Global MASTER-Net optical observations
  90. GRB 181202A: Swift-BAT refined analysis
  91. GRB 181202A: Swift-XRT refined Analysis
  92. GRB 181202A: Enhanced Swift-XRT position
  93. GRB 181202A: Swift detection of a burst with an optical counterpart
  94. GRB 181201A: Fermi-LAT detection
  95. GRB 181201A: iTelescope optical afterglow detection
  96. GRB 181201A: Swift-XRT afterglow detection
  97. GRB 181201A: Swift ToO observations
  98. GRB 181201A: Swift-XRT afterglow
  99. GRB 181201A: likely Swift/XRT afterglow
  100. GRB 181123B: ATCA 5/9 GHz rapid-response radio observation

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