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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"

28233 results found.

  1. GRB 181203A: Swift-XRT refined Analysis
  2. GRB 181203A: Swift-BAT refined analysis
  3. GRB 181201A: Swift/UVOT Detection
  4. GRB 181202A: Swift/UVOT Detection
  5. GRB 181202A: RATIR Optical and NIR Observations
  6. GRB 181203A: Enhanced Swift-XRT position
  7. GRB 181203A: Swift detection of a burst
  8. GRB 181201A: Further COATLI Optical Monitoring
  9. GRB 181201A: Insight-HXMT/HE detection
  10. GRB 181202A: Swift-BAT refined analysis
  11. GRB 181202A: Swift-XRT refined Analysis
  12. GRB 181201A: GROND detection of the afterglow and redshift upper limit of z < 3
  13. GRB 181201A: optical observations in Chilescope observatory
  14. GRB 181202A: Enhanced Swift-XRT position
  15. GRB 181202A: Swift detection of a burst with an optical counterpart
  16. GRB 181201A: COATLI Optical Detection
  17. GRB 181201A: Fermi-LAT detection
  18. GRB 181201A: Zeiss-1000/CrAO optical observations
  19. GRB 181201A: NOT optical observations
  20. GRB 181201A: optical observations in SAAO
  21. GRB 181201A: iTelescope optical afterglow detection
  22. GRB 181201A: Swift-XRT afterglow detection
  23. GRB 181201A: Swift-XRT afterglow
  24. GRB 181201A MASTER-Net OT detection
  25. GRB 181201A: a long GRB detected by INTEGRAL
  26. Short-duration GRB 181121.4: MASTER-Tavrida possible OT detection near the PGC galaxy during large Fermi error box inspection
  27. GRB 181127A : a long GRB detected by INTEGRAL
  28. GRB 181126A: Swift-BAT refined analysis
  29. GRB 181123B: Keck further near-infrared imaging
  30. GRB 181126A: Swift/UVOT Upper Limits
  31. GRB 181126A: Swift-XRT refined Analysis
  32. GRB 181126A deep Gemini imaging
  33. GRB 181126A: Enhanced Swift-XRT position
  34. GRB 181126A: Swift detection of a burst
  35. GRB 181125A: Fermi GBM observation
  36. GRB 181125A: Swift-BAT refined analysis
  37. GRB 181125A: Swift detection of a burst
  38. GRB 181123B: Global MASTER Net optical inspection
  39. GRB 181123A, Swift-BAT refined analysis
  40. GRB 181123B: Keck near-infrared imaging
  41. GRB 181123B: Swift/UVOT Upper Limits
  42. GRB 181123B: Swift-XRT refined Analysis
  43. GRB 181123B: Enhanced Swift-XRT position
  44. GRB 181123B: Swift detection of a short burst
  45. GRB 181119A: Insight-HXMT/HE detection
  46. GRB 181120A: Fermi GBM observation
  47. GRB 181120A: Fermi-LAT detection
  48. Swift Trigger 872470: further Swift analysis
  49. Swift Trigger 872470 is probably not a GRB
  50. Konus-Wind observation of GRB 181110A
  51. GRB 181110A: optical observations in Chilescope observatory
  52. GROND observations of GRB181110A
  53. GRB 181110A, Swift-BAT refined analysis
  54. GRB 181110A: Swift/UVOT Detection
  55. GRB 181110A: Swift-XRT refined Analysis
  56. GRB 181110A: Enhanced Swift-XRT position
  57. GRB 181110A: optical observations from iTelescope SSO
  58. GRB 181110A: Kanata 1.5m optical observation
  59. GRB 181110A: Swift detection of a burst with an optical counterpart
  60. Swift Trigger 871103 is not an astrophysical event
  61. Fermi GRB 181105.31: Global MASTER Net optical observations
  62. GRB 181103A: AbAO optical upper limit
  63. GRB 181028A: Insight-HXMT/HE detection
  64. GRB 181103A: Swift/UVOT Detection
  65. GRB 181103A: Nanshan-1m optical upper limit
  66. GRB 181103A: Swift-BAT refined analysis
  67. GRB 181103A: Swift-XRT refined Analysis
  68. GRB 181103A: Enhanced Swift-XRT position
  69. GRB 181103A: Swift detection of a burst
  70. GRB 181030A: Swift/UVOT Detection
  71. GRB 181030A, Swift-BAT refined analysis
  72. GRB 181030A: RATIR Optical and NIR Observations
  73. GRB 181030A: Swift-XRT refined Analysis
  74. GRB 181030A: Enhanced Swift-XRT position
  75. GRB 181030A: SAO RAS optical observations
  76. GRB 181030A: Swift detection of a burst with a possible optical counterpart
  77. GRB 181028A: Fermi GBM observation
  78. GRB 181027A: Fermi GBM detection
  79. GRB 181027A: Swift-BAT refined analysis
  80. IceCube-181023A: HAWC follow-up
  81. IceCube-181023A: MASTER Net optical alert and follow up observations
  82. Fermi-LAT Gamma-ray Observations of IceCube-181023A
  83. GRB 181023A: Swift-BAT refined analysis
  84. GRB 181023A: Swift/UVOT Upper Limits
  85. GRB 181022A: Swift-XRT refined Analysis
  86. GRB 181023A: Swift-XRT refined Analysis
  87. GRB 181022A: GROND upper limits
  88. GRB 181022A: LCO Sutherland observations
  89. GRB 181023A: Enhanced Swift-XRT position
  90. GRB 181022A: Swift/UVOT Upper Limits
  91. GRB 181023A: Swift detection of a burst
  92. GRB 181022A: Swift-BAT refined analysis
  93. GRB 181022A: Swift detection of a burst
  94. GRB 181020A: Swift/UVOT Detection
  95. GRB 181020A: LCO Cerro Tololo observations
  96. GRB 181020A: Swift-BAT refined analysis
  97. GRB 181018A: Insight-HXMT/HE detection
  98. GRB 181017A: Insight-HXMT/HE detection
  99. GRB 181020A: Swift-XRT refined Analysis
  100. GRB 181020A: Fermi GBM detection

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