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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"

28275 results found.

  1. GRB 180715A: LCO Sutherland possible optical candidate
  2. GRB 180715A: Swift-XRT observations
  3. GRB180714A: a long GRB detected by INTEGRAL
  4. IceCube-171106A: MASTER optical observation
  5. GRB 180705A: OSN observations
  6. GRB 180709A: Swift-BAT refined analysis
  7. GRB 180709A: Swift/UVOT Upper Limits
  8. GRB 180709A: Swift-XRT refined Analysis
  9. GRB 180709A: Optical limits
  10. GRB 180709A: COATLI Optical Observations
  11. GRB 180709A: Enhanced Swift-XRT position
  12. GRB 180703A: Swift-XRT afterglow detection
  13. GRB 180709A: Swift detection of a burst
  14. GRB 180705A: RTT150 optical upper limit
  15. Trigger 846740: Swift trigger near NGC5055
  16. IPN Triangulation of GRB 180703A
  17. GRB 180706A: GOTO optical limits
  18. GRB 180706A: TSHAO optical observations
  19. GRB 180706A: Swift/UVOT Detection
  20. GRB 180706A: Swift-BAT refined analysis
  21. GRB 180705A: Swift-XRT refined Analysis
  22. GRB 180706A: Fermi GBM observation
  23. GRB 180706A: Swift-XRT refined Analysis
  24. GRB 180706A: Enhanced Swift-XRT position
  25. Konus-Wind observation of GRB 180701A
  26. GRB 180705A: TSHAO optical upper limit
  27. GRB 180705A: Swift/UVOT Upper Limits
  28. GRB 180705A: RATIR Optical Observations
  29. GRB 180706A: COATLI Optical Detection
  30. GRB 180706A: Swift detection of a burst with optical counterpart
  31. IPN Triangulation of GRB 180703B
  32. GRB 180705A: Swift-BAT refined analysis
  33. GRB 180705A: Enhanced Swift-XRT position
  34. GRB 180705A: Swift-XRT observations
  35. GRB 180705A: Swift detection of a burst
  36. GRB 180703A: Swift/UVOT Upper Limits
  37. GRB 180703A: Fermi GBM detection
  38. GRB 180704A: Swift-XRT refined Analysis
  39. GRB 180704A: Swift-BAT refined analysis
  40. GRB 180704A: Swift/UVOT Upper Limits
  41. GRB 180703A: LCO Sutherland possible optical candidate
  42. GRB 180703A: Swift-XRT observations
  43. GRB 180704A: Enhanced Swift-XRT position
  44. GRB 180704A: Swift-XRT observations
  45. GRB 180703B: Fermi-LAT detection
  46. GRB 180630A: Swift/UVOT Detection
  47. GRB 180701A: MAXI/GSC detection
  48. GRB 180630A: Swift-BAT refined analysis
  49. GRB 180630A: Swift-XRT refined Analysis
  50. GRB 180630A: Fermi GBM detection
  51. GRB 180630A: Enhanced Swift-XRT position
  52. GRB 180630A: Swift detection of a burst with an optical counterpart
  53. GRB 180626C: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 551697835)
  54. GRB 180626A: TSHAO optical upper limit
  55. Konus-Wind observation of GRB 180626A
  56. GRB 180626A: RATIR Optical Observations
  57. IPN Triangulation of GRB 180626C (short)
  58. IPN Triangulation of GRB 180626B (short)
  59. GRB 180626A: Swift-BAT refined analysis
  60. GRB 180626A: KAIT Optical Upper Limit
  61. GRB 180626A: Swift-XRT refined Analysis
  62. GRB 180626A: COATLI Optical Detection
  63. GRB 180626A: Swift/UVOT Detection
  64. GRB 180626A: RATIR Optical Detection
  65. GRB 180626A: ISON-MN optical observations
  66. GRB 180626A: Enhanced Swift-XRT position
  67. GRB 180626A: A long GRB detected by INTEGRAL
  68. GRB 180626A: Swift detection of a burst with an optical counterpart
  69. GRB 180624A: Swift-BAT refined analysis
  70. AT2018cow: Swift/BAT data search
  71. GRB 180624A: RATIR Optical Observations
  72. GRB 180624A: LBT/MODS redshift measurement
  73. GRB 180613A: LCO Afterglow detection
  74. GRB 180624A: GROND observations
  75. GRB 180624A: LCO Siding Springs afterglow candidate
  76. GRB 180624A: MITSuME Okayama optical upper limits
  77. GRB 180624A: Swift-XRT refined Analysis
  78. GRB 180624A: Swift/UVOT Upper Limits
  79. GRB 180624A: Enhanced Swift-XRT position
  80. GRB 180623A: Swift-BAT refined analysis
  81. GRB 180624A: Swift detection of a burst
  82. GRB 180623A: Swift/UVOT Detection
  83. GRB 180623A: Swift-XRT refined Analysis
  84. GRB 180623A: Enhanced Swift-XRT position
  85. GRB 180623A: Swift detection of a burst
  86. GRB 180620B: Swift/UVOT Detection
  87. GRB 180620A iTelescope observation
  88. Konus-Wind observation of GRB 180618A (a short GRB with extended emission)
  89. GRB 180620B: Swift-BAT refined analysis
  90. GRB 180613A: Afterglow confirmation and added photometry
  91. GROND observations of GRB 180620B
  92. GROND observations of GRB 180620A
  93. GRB 180620B: Swift-XRT refined Analysis
  94. GRB 180620A: Swift-BAT refined analysis
  95. GRB 180620B: Enhanced Swift-XRT position
  96. GRB 180620B: Fermi GBM detection
  97. GRB 180620A: Xinglong-2.16m optical observations
  98. GRB 180618A: Swift/UVOT Detection
  99. GRB 180618A: TSHAO optical upper limit
  100. GRB 180620A: Swift-XRT refined Analysis

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