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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"

27283 results found.

  1. GRB 180626A: Swift-XRT refined Analysis
  2. GRB 180626A: COATLI Optical Detection
  3. GRB 180624A: LCO Haleakala observations
  4. GRB 180626A: Swift/UVOT Detection
  5. GRB 180626A: RATIR Optical Detection
  6. GRB 180626A: LCO Haleakala observations
  7. GRB 180626A: ISON-MN optical observations
  8. GRB 180626A: Swift detection of a burst with an optical counterpart
  9. GRB 180623B: CALET Gamma-Ray Burst Monitor detection
  10. GRB 180624A: Swift-BAT refined analysis
  11. GRB 180624A: RATIR Optical Observations
  12. GRB 180624A: LBT/MODS redshift measurement
  13. GRB 180624A: GROND observations
  14. GRB 180624A: LCO Siding Springs afterglow candidate
  15. GRB 180624A: Swift-XRT refined Analysis
  16. GRB 180624A: Swift/UVOT Upper Limits
  17. GRB 180623A: Swift-BAT refined analysis
  18. GRB 180624A: Swift detection of a burst
  19. GRB 180623A: Swift/UVOT Detection
  20. GRB 180623A: Swift-XRT refined Analysis
  21. GRB 180623A: Swift detection of a burst
  22. GRB 180620B: Swift/UVOT Detection
  23. GRB 180620A iTelescope observation
  24. GRB 180620B: Swift-BAT refined analysis
  25. GROND observations of GRB 180620B
  26. GROND observations of GRB 180620A
  27. GRB 180620B: Swift-XRT refined Analysis
  28. GRB 180618B: CALET Gamma-Ray Burst Monitor detection
  29. GRB 180620A: Swift-BAT refined analysis
  30. GRB 180620B: Fermi GBM detection
  31. GRB 180620A: Xinglong-2.16m optical observations
  32. GRB 180618A: Swift/UVOT Detection
  33. GRB 180620A: Swift-XRT refined Analysis
  34. GRB 180620B: Swift detection of a burst with an optical counterpart
  35. GRB 180620A: COATLI Detection and Light Curve
  36. GRB 180620A: Swift/UVOT Detection
  37. GRB 180618A: Xinglong-2.16m optical upper limit
  38. GRB 180620A: LCO McDonald observations
  39. GRB 180620A: MASTER OT observation
  40. GRB 180620A: ISON-MN afterglow confirmation
  41. GRB 180620A: RATIR Optical Afterglow Detection
  42. GRB 180620A: Swift detection of a burst with an optical counterpart
  43. GRB 180618A: MASTER OT observation (a short GRB with extended emission)
  44. GRB 180618A: Swift-BAT refined analysis (a short GRB with extended emission)
  45. GRB 180618A: Fermi GBM detection
  46. GRB 180618A: Swift-XRT refined Analysis
  47. GRB 180618A: LT prompt observations
  48. GRB 180618A: Swift detection of a burst with an optical counterpart
  49. GRB 180614A: 1.5m OSN I-band observation
  50. GRB 180614A: Swift/UVOT Upper Limits
  51. GRB 180614A: Swift-BAT refined analysis
  52. GRB 180614A: NOT optical upper limits
  53. GRB 180614A: MASTER observation
  54. GRB 180614A: Swift-XRT refined Analysis
  55. GRB 180614A: Swift detection of a burst
  56. GRB 180613A: Swift/UVOT Upper Limits
  57. GRB 180613A GROND observations
  58. GRB 180613A, Swift-BAT refined analysis
  59. GRB 180613A: Swift-XRT refined Analysis
  60. GRB 180613A: Swift detection of a burst
  61. GRB 180611A: Fermi GBM observation
  62. IPN Triangulation of GRB 180611A (long)
  63. GRB 180605A: Fermi GBM observation
  64. IPN Triangulation of GRB 180605A (long)
  65. GW170817/GRB170817A: LBT optical detection
  66. Fermi GBM trigger 180604900/549840956 likely not a GRB
  67. GRB 180602B: Fermi GBM detection
  68. GRB 180602A: Swift/UVOT Upper Limits
  69. GRB 180602A: Swift-XRT refined Analysis
  70. GRB 180602A: Swift-BAT refined analysis
  71. GRB 180602A: Swift detection of a burst
  72. Fermi GBM trigger 549533811/180601345 is not a GRB
  73. GRB 180529A: CALET Gamma-Ray Burst Monitor detection
  74. Swift Trigger 834937 is not a GRB
  75. GRB 180526A: CALET Gamma-Ray Burst Monitor detection
  76. GRB180523B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 548793993)
  77. GRB 180523A: CALET Gamma-Ray Burst Monitor detection
  78. Fermi GBM trigger 548829437/180524192 is not a GRB
  79. GRB 180505A: AstroSat CZTI detection
  80. GRB 180514A: Swift/UVOT Upper Limits
  81. GRB 180514A: GOTO Optical Observations
  82. GRB 180514A: Swift-BAT refined analysis
  83. GRB 180514A: Swift-XRT refined Analysis
  84. GRB 180512A: VLT/HAWK-I NIR Observations
  85. GRB 180514A: Swift detection of a burst
  86. GRB 180512A: Swift-XRT refined Analysis
  87. GRB 180512A: Swift-BAT refined analysis
  88. GRB 180512A: RATIR Optical Observations
  89. GRB 180512A: LBT optical detection
  90. GRB 180512A: Swift/UVOT Upper Limits
  91. GRB 180512A: GROND upper limits
  92. GRB 180512A: NOT upper limits
  93. GRB 180512A: OASDG optical observations
  94. GRB 180512A: Upper limits from OSN
  95. GRB 180512A: Swift detection of a burst
  96. GRB 180510A: Swift/UVOT followup observations
  97. GRB 180510B: Swift-XRT refined Analysis
  98. GRB 180510A: Swift-XRT refined Analysis
  99. Swift trigger 831888: misidentification of 4U 1416-62
  100. GRB 180510B: Swift-BAT refined analysis

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