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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"

6829 results found.

  1. INTEGRAL observation of IceCube-190104A
  2. GRB 190114A: Swift-XRT refined Analysis
  3. GRB 190110A: Fermi GBM detection
  4. GRB 190109B: Fermi GBM observation
  5. GRB 190106A: OSN Afterglow Observations
  6. GRB 190109B: Swift-XRT refined Analysis
  7. GRB 190109A: Fermi GBM observation
  8. GRB 190109A: Swift-XRT refined Analysis
  9. GRB 190106A: Swift-XRT refined Analysis
  10. Fermi LAT Gamma-ray Observations of IceCube-190104A
  11. GRB 190103B: Swift-XRT refined Analysis
  12. GRB 181231A: Fermi GBM detection
  13. GRB 181231A: Fermi-LAT detection
  14. GRB 181225A: further Swift-XRT observations
  15. GRB 181228A: Swift-XRT refined Analysis
  16. GRB 181222B: Swift follow-up observations of MASTER optical transient J204928.79+245744.0
  17. GRB 181228A: Fermi GBM observation
  18. GRB 181227A: Fermi GBM detection
  19. GRB 181225A: Swift observations and X-ray candidate afterglow
  20. GRB 181225A: Fermi GBM detection
  21. GRB 181225A: Fermi-LAT Detection
  22. Konus-Wind observation of GRB 181222B
  23. GRB 181222B : Fermi GBM detection
  24. GRB 181222A: Fermi GBM observation
  25. GRB 181213A: Swift-XRT refined Analysis
  26. GRB 181212A: Fermi GBM Detection
  27. GRB 181126B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 564897175)
  28. GRB 181203A: Swift-XRT refined Analysis
  29. GRB 181201A: Swift/UVOT Detection
  30. GRB 181202A: Swift-XRT refined Analysis
  31. GRB 181201A: optical observations in Chilescope observatory
  32. GRB 181201A: Fermi-LAT detection
  33. GRB 181201A: iTelescope optical afterglow detection
  34. GRB 181201A: Swift-XRT afterglow detection
  35. GRB 181126A: No Ks-band afterglow detection with Keck I
  36. GRB 181126A: Swift-XRT refined Analysis
  37. GRB 181126A: Fermi GBM observation
  38. GRB 181125A: Fermi GBM observation
  39. GRB 181123B: Swift-XRT refined Analysis
  40. GRB 181120A: Fermi GBM observation
  41. GRB 181120A: Fermi-LAT detection
  42. Swift Trigger 872470: further Swift analysis
  43. GRB 181110A: optical observations in Chilescope observatory
  44. GRB 181110A: Swift-XRT refined Analysis
  45. GRB 181103A: Swift-XRT refined Analysis
  46. GRB 181030A: Swift-XRT refined Analysis
  47. GRB 181030A: SAO RAS optical observations
  48. GRB 181028A: Fermi GBM observation
  49. GRB 181028A: Fermi-LAT detection
  50. GRB 181027A: Fermi GBM detection
  51. IceCube-181023A: HAWC follow-up
  52. Fermi-LAT Gamma-ray Observations of IceCube-181023A
  53. GRB 181022A: Swift-XRT refined Analysis
  54. GRB 181023A: Swift-XRT refined Analysis
  55. GRB 181020A: Global MASTER Net OT observations
  56. GRB 181020A: Swift-XRT refined Analysis
  57. GRB 181020A: Fermi GBM detection
  58. GRB 181020A: Fermi-LAT detection
  59. Fermi-LAT Gamma-ray Observations of IceCube-181014A
  60. GRB 181013A: Swift detection of a probable burst
  61. GRB180913A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 558557292)
  62. GRB 181010A: Fermi GBM observation
  63. GRB 181010A: Swift-XRT refined Analysis
  64. GRB 181003A: Swift-XRT afterglow detection
  65. GRB 181002A: Swift-XRT refined Analysis
  66. GRB 180930A: Swift-XRT refined Analysis
  67. GRB 180925A: Swift-XRT refined Analysis
  68. GRB 180924A: Swift-XRT refined Analysis
  69. GRB 180923B: Fermi GBM detection
  70. GRB 180914B: Swift-XRT afterglow detection
  71. GRB 180914B: Fermi-LAT detection
  72. GRB 180914A: Swift-XRT observations
  73. GRB 180914A: Fermi GBM detection
  74. GRB 180914A: Fermi-LAT detection
  75. IceCube-180908A: CALET Gamma-Ray Burst Monitor upper limits
  76. Fermi-LAT Gamma-ray Observations of IceCube-180908A
  77. INTEGRAL observation of IceCube-180908A
  78. IceCube-180908A: HAWC follow-up
  79. GRB 180905A: Swift-XRT refined Analysis
  80. GRB 180904A: Swift-XRT refined Analysis
  81. GRB 180904A: SAO RAS optical observations
  82. GRB 180904A: OSN observations
  83. GRB 180904A: NOT optical observations, candidate host galaxy
  84. GRB 180829A: Swift-XRT observations
  85. GRB 180828A: Swift-XRT refined Analysis
  86. GRB 180828A: Fermi GBM observation
  87. GRB 180823A: Swift-XRT refined Analysis
  88. GRB 180821A: Swift-XRT refined Analysis
  89. GRB180806A: confirmation of the X-ray afterglow
  90. GRB 180818B: Swift-XRT refined Analysis
  91. GRB 180818B: Fermi GBM observations
  92. GRB 180818A: Swift-XRT refined Analysis
  93. LIGO/Virgo GW170817: A steep decline in the radio light curve and prediction for the X-rays
  94. Chandra X-ray observations of GW170817 at 1 year post-merger: increasingly rapid fading
  95. GRB 180812A: Fermi GBM detection
  96. GRB 180812A: Swift-XRT refined Analysis
  97. Konus-Wind observation of GRB 180809B
  98. GRB 180809B: Swift-XRT refined Analysis
  99. GRB 180809B, Swift-BAT refined analysis
  100. Swift Trigger 852625: Swift/BAT/XRT/UVOT observations

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