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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"

19663 results found.

  1. GRB 190110A: Fermi GBM detection
  2. GRB 190110A: Swift detection of a burst
  3. GRB 190109B: Fermi GBM observation
  4. GRB 190106A: OSN Afterglow Observations
  5. GRB 190109B: Swift/UVOT Upper Limits
  6. GRB 190109A: Swift/UVOT Upper Limits
  7. GRB 190109B: Swift-XRT refined Analysis
  8. GRB 190109B: Swift-BAT refined analysis
  9. GRB 190109A: Fermi GBM observation
  10. GRB 190109B: BOOTES-5/JGT optical observations
  11. GRB 190109B: Mondy optical upper limit
  12. GRB 190109A: Swift-BAT refined analysis
  13. GRB 190109B: Enhanced Swift-XRT position
  14. GRB 190109B: Swift-XRT observations
  15. GRB 190109B: Swift detection of a burst
  16. IPN triangulation of GRB 190103A (long)
  17. GRB 190109A: Swift-XRT refined Analysis
  18. GRB 190109A: Enhanced Swift-XRT position
  19. GRB 190109A: Prompt enhanced Swift-XRT position
  20. GRB 190109A: Swift detection of a burst
  21. IceCube-190104A: Swift-XRT observations
  22. Trigger 882561: Swift detection of MAXI J1631-479
  23. Konus-Wind observation of GRB 190106A
  24. GRB 190106A: Swift-XRT refined Analysis
  25. GRB 190103B: CALET Gamma-Ray Burst Monitor detection
  26. GRB 190106A: BOOTES-4/MET optical observations
  27. GRB 190106A: Swift/UVOT Detection
  28. GRB 190106A: Swift-BAT refined analysis
  29. GRB 190106A: Bassano Bresciano Observatory optical detection
  30. GRB 190106A: Enhanced Swift-XRT position
  31. GRB 190106A: MITSuME Akeno optical observation
  32. GRB 190106A: MASTER Amur OT detection
  33. GRB 190106A: Swift detection of a burst with an optical counterpart
  34. SWIFT GRB190106.57 Global MASTER-Net OT detection
  35. Konus-Wind observation of GRB 190103B
  36. GRB 190103B: Bassano Bresciano observatory upper limit
  37. GRB 190103B: Swift-BAT refined analysis
  38. GRB 190103B: Swift-XRT refined Analysis
  39. GRB 190103B: Enhanced Swift-XRT position
  40. GRB 190103B: Swift detection of a burst
  41. GRB 181231A: Fermi-LAT detection
  42. GRB 181225A: further Swift-XRT observations
  43. GRB 181228A: Global MASTER Net OT is the same REM IR transient
  44. Swift Trigger 880127 is not a GRB
  45. GRB 181228A: Swift-XRT refined Analysis
  46. GRB 181228A: Swift-BAT refined analysis
  47. GRB 181222B: Swift follow-up observations of MASTER optical transient J204928.79+245744.0
  48. GRB 181228A: Swift/UVOT Upper Limits
  49. GRB 181228A: Fermi GBM observation
  50. IPN Triangulation of GRB 181227A (long)
  51. GRB 181228A: Global MASTER Net OT detection
  52. GRB 181228A: Enhanced Swift-XRT position
  53. GRB 181228A: KAIT Optical Upper Limit
  54. GRB 181228A: Swift detection of a burst
  55. GRB 181222B: Swift ToO observations
  56. GRB 181225A: Swift observations and X-ray candidate afterglow
  57. GRB 181225A: Swift ToO observations
  58. GRB 181225A: Fermi-LAT Detection
  59. GRB 181224A: Swift-BAT refined analysis
  60. GRB 181224A: Swift detection of a burst
  61. Trigger 878548: Swift detection of AX 1631.9-4752
  62. Swift Trigger 878504 is not astrophysical
  63. GRB 181213A: Swift/UVOT Observations
  64. GRB 181213A:Insight-HXMT/HE detection
  65. GRB 181213A: HMM-0.5m, NEXT-0.6m, CNEOST-1m optical observations
  66. GRB 181213A: Swift-XRT refined Analysis
  67. GRB 181213A: Enhanced Swift-XRT position
  68. IPN Triangulation of GRB 181212A (long)
  69. GRB 181213A: Swift-BAT refined analysis
  70. GRB181213A: Swift/UVOT Detection
  71. GRB 181213A: Swift-XRT observations
  72. GRB 181213A: BOOTES-5/JGT optical observations
  73. SWIFT GRB181213A Global MASTER-Net bright OT discovery
  74. GRB 181213A: Swift detection of a burst
  75. GRB 181203A: GROND detection of the afterglow
  76. GRB 181203A: BOOTES-3/YA optical observations
  77. Swift Trigger 874754 is likely not an astrophysical event
  78. GRB 181203A: Swift/UVOT Upper Limits
  79. GRB 181203A: Swift-XRT refined Analysis
  80. GRB 181203A: Swift-BAT refined analysis
  81. GRB 181201A: Swift/UVOT Detection
  82. GRB 181202A: Swift/UVOT Detection
  83. GRB 181202A: RATIR Optical and NIR Observations
  84. GRB 181203A: Enhanced Swift-XRT position
  85. GRB 181203A: Swift detection of a burst
  86. GRB 181202A: Global MASTER-Net optical observations
  87. GRB 181202A: Swift-BAT refined analysis
  88. GRB 181202A: Swift-XRT refined Analysis
  89. GRB 181202A: Enhanced Swift-XRT position
  90. GRB 181202A: Swift detection of a burst with an optical counterpart
  91. GRB 181201A: Fermi-LAT detection
  92. GRB 181201A: iTelescope optical afterglow detection
  93. GRB 181201A: Swift-XRT afterglow detection
  94. GRB 181201A: Swift ToO observations
  95. GRB 181201A: Swift-XRT afterglow
  96. GRB 181201A: likely Swift/XRT afterglow
  97. GRB 181123B: ATCA 5/9 GHz rapid-response radio observation
  98. GRB 181126A: Swift-BAT refined analysis
  99. GRB 181126A: Swift/UVOT Upper Limits
  100. GRB 181126A: Swift-XRT refined Analysis

Advanced

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