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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"

28103 results found.

  1. GRB 180721A: Swift-BAT refined analysis
  2. GRB 180720C: Swift-BAT refined analysis
  3. GRB 180721A: Swift-XRT refined Analysis
  4. GRB 180720B: Swift-BAT refined analysis
  5. GRB 180721A: Enhanced Swift-XRT position
  6. GRB 180721A: Swift detection of a burst
  7. GRB 180720B: MAXI/GSC detection
  8. GRB 180720C: Swift/UVOT Upper Limits
  9. GRB 180720C: Fermi GBM observation
  10. GRB 180720C: Enhanced Swift-XRT position
  11. GRB 180720B: Swift-XRT refined Analysis
  12. GRB 180720C: Swift detection of a burst or possible Galactic Transient
  13. GRB 180720B: Fermi GBM observation
  14. GRB 180720B : TSHAO optical observations
  15. GRB 180720B: Kanata 1.5m optical/NIR observation
  16. GRB 180720B: LCO Haleakala possible bright optical candidate
  17. GRB 180720A: Fermi GBM observation
  18. GRB 180720B: Swift detection of a burst
  19. GRB 180718B: MASTER optical observation
  20. GRB 180715A: Swift/UVOT Upper Limits
  21. Swift detects a flare from AX 1631.9-4752
  22. GRB 180718B: Fermi GBM detection
  23. GRB 180718A: Fermi GBM detection
  24. GRB 180718A short GRB detected by IPN and found in ground analysis of BAT data
  25. GRB 180715A: COATLI Optical Observations
  26. GRB 180715A: Swift-XRT observations
  27. GRB 180715A: Swift-BAT refined analysis
  28. GRB 180715A: GOTO optical limits
  29. GRB 180715A: LCO Sutherland possible optical candidate
  30. GRB 180715A: Swift-XRT observations
  31. GRB180714A: a long GRB detected by INTEGRAL
  32. IceCube-171106A: MASTER optical observation
  33. GRB 180705A: OSN observations
  34. GRB 180709A: Swift-BAT refined analysis
  35. GRB 180709A: Swift/UVOT Upper Limits
  36. GRB 180709A: Swift-XRT refined Analysis
  37. GRB 180709A: Optical limits
  38. GRB 180709A: COATLI Optical Observations
  39. GRB 180709A: Enhanced Swift-XRT position
  40. GRB 180703A: Swift-XRT afterglow detection
  41. GRB 180709A: Swift detection of a burst
  42. GRB 180705A: RTT150 optical upper limit
  43. Trigger 846740: Swift trigger near NGC5055
  44. IPN Triangulation of GRB 180703A
  45. GRB 180706A: GOTO optical limits
  46. GRB 180706A: TSHAO optical observations
  47. GRB 180706A: Swift/UVOT Detection
  48. GRB 180706A: Swift-BAT refined analysis
  49. GRB 180705A: Swift-XRT refined Analysis
  50. GRB 180706A: Fermi GBM observation
  51. GRB 180706A: Swift-XRT refined Analysis
  52. GRB 180706A: Enhanced Swift-XRT position
  53. Konus-Wind observation of GRB 180701A
  54. GRB 180705A: TSHAO optical upper limit
  55. GRB 180705A: Swift/UVOT Upper Limits
  56. GRB 180705A: RATIR Optical Observations
  57. GRB 180706A: COATLI Optical Detection
  58. GRB 180706A: Swift detection of a burst with optical counterpart
  59. IPN Triangulation of GRB 180703B
  60. GRB 180705A: Swift-BAT refined analysis
  61. GRB 180705A: Enhanced Swift-XRT position
  62. GRB 180705A: Swift-XRT observations
  63. GRB 180705A: Swift detection of a burst
  64. GRB 180703A: Swift/UVOT Upper Limits
  65. GRB 180703A: Fermi GBM detection
  66. GRB 180704A: Swift-XRT refined Analysis
  67. GRB 180704A: Swift-BAT refined analysis
  68. GRB 180704A: Swift/UVOT Upper Limits
  69. GRB 180703A: LCO Sutherland possible optical candidate
  70. GRB 180703A: Swift-XRT observations
  71. GRB 180704A: Enhanced Swift-XRT position
  72. GRB 180704A: Swift-XRT observations
  73. GRB 180703B: Fermi-LAT detection
  74. GRB 180630A: Swift/UVOT Detection
  75. GRB 180701A: MAXI/GSC detection
  76. GRB 180630A: Swift-BAT refined analysis
  77. GRB 180630A: Swift-XRT refined Analysis
  78. GRB 180630A: Fermi GBM detection
  79. GRB 180630A: Enhanced Swift-XRT position
  80. GRB 180630A: Swift detection of a burst with an optical counterpart
  81. GRB 180626C: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 551697835)
  82. GRB 180626A: TSHAO optical upper limit
  83. Konus-Wind observation of GRB 180626A
  84. GRB 180626A: RATIR Optical Observations
  85. IPN Triangulation of GRB 180626C (short)
  86. IPN Triangulation of GRB 180626B (short)
  87. GRB 180626A: Swift-BAT refined analysis
  88. GRB 180626A: KAIT Optical Upper Limit
  89. GRB 180626A: Swift-XRT refined Analysis
  90. GRB 180626A: COATLI Optical Detection
  91. GRB 180626A: Swift/UVOT Detection
  92. GRB 180626A: RATIR Optical Detection
  93. GRB 180626A: ISON-MN optical observations
  94. GRB 180626A: Enhanced Swift-XRT position
  95. GRB 180626A: A long GRB detected by INTEGRAL
  96. GRB 180626A: Swift detection of a burst with an optical counterpart
  97. GRB 180624A: Swift-BAT refined analysis
  98. AT2018cow: Swift/BAT data search
  99. GRB 180624A: RATIR Optical Observations
  100. GRB 180624A: LBT/MODS redshift measurement

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