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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"

28287 results found.

  1. GRB 180325A: Swift detection of a burst with an optical counterpart
  2. GRB 180324A: Swift/UVOT Upper Limits
  3. GRB 180324A: Swift-XRT refined Analysis
  4. GRB 180324A: Enhanced Swift-XRT position
  5. GRB 180324A: RATIR Optical Observations and Possible Afterglow Detection
  6. GRB 180324A: Swift detection of a burst
  7. IPN Triangulation of GRB 180317A (short/hard)
  8. GRB 180316A: RATIR Optical Observations
  9. GRB 180316A: TSHAO optical observations
  10. GRB 180316A: RATIR Optical Observations, Possible Re-brightening
  11. GRB 180316A: Swift-BAT refined analysis
  12. GRB 180316A: Swift-XRT refined Analysis
  13. GRB 180316A: Swift/UVOT Detection
  14. GRB 180316A: RATIR Optical Observations
  15. GRB 180316A: Enhanced Swift-XRT position
  16. GRB 180316A: LCO Cerro Tololo observations
  17. GROND observations of GRB 180316A
  18. GRB 180316A: Swift detection of a burst
  19. GRB 180314B: RATIR Optical Observations
  20. GRB 180314B: Swift-BAT refined analysis
  21. GRB 180314B: Zeiss-1000/CrAO optical upper limit
  22. GRB 180314B: Swift/UVOT Upper Limits
  23. GRB 180314B: Swift-XRT refined Analysis
  24. GRB 180314B: Enhanced Swift-XRT position
  25. GRB 180313A: Fermi GBM detection
  26. GRB 180314B: Swift detection of a burst
  27. GRB 180314A: Swift-BAT refined analysis
  28. Swift Trigger on MAXI J1820+070
  29. GRB 180314A: TAROT La Silla observatory optical observations
  30. GRB 180314A: LCO Siding Springs observations
  31. GRB 180314A: Swift-XRT refined Analysis
  32. GRB 180314A: Fermi GBM observation
  33. GRB 180314A: Swift/UVOT Detection
  34. GRB 180314A: REM optical/NIR observations
  35. GRB 180314A: MASTER-Net OT dtetction
  36. GRB 180314A: Enhanced Swift-XRT position
  37. GRB180314A: GROND detection of the afterglow
  38. GRB 180314A: Swift detection of a burst with an optical counterpart
  39. GRB 180311A: Swift/UVOT Upper Limits
  40. GRB 180311A, Swift-BAT refined analysis
  41. GRB 180311A: Swift-XRT refined Analysis
  42. MAXI J1820+070: Swift/UVOT counterpart correction
  43. Swift detection of MAXI J1820+070
  44. GRB 180311A: Enhanced Swift-XRT position
  45. GRB 180311A: Swift detection of a burst
  46. GRB 180305A: RATIR Optical Observations
  47. GRB 180305A: Swift/UVOT Upper Limits
  48. GRB 180305A: Mondy optical observations
  49. GRB 180305A: Swift-XRT afterglow detection
  50. GRB 180305A: RATIR Optical Afterglow Candidate
  51. GRB 180305A: Fermi GBM detection
  52. GRB 180305A: Fermi-LAT detection
  53. GRB 180221B: Insight-HXMT/HE observation
  54. GRB 180224A: Swift/UVOT Detection
  55. GRB 180224A: OASDG optical observations
  56. IPN Triangulation of GRB 180223A (long)
  57. GRB 180210A: Insight-HXMT/HE observation
  58. Swift Trigger 811686 is probably not an astrophysical source.
  59. GRB 180224A: AbAO optical observations
  60. GRB 180224A: Swift-BAT refined analysis
  61. GRB 180224A: RATIR Optical Observations
  62. GRB 180224A: Swift-XRT refined Analysis
  63. GRB180224A: Global MASTER-Net bright OT detection
  64. GRB 180224A: Enhanced Swift-XRT position
  65. GRB 180224A: Swift detection of a burst with an optical counterpart
  66. MAXI J1813-095 source: AbAO optical observations
  67. GRB 180222A: Swift/UVOT Upper Limits
  68. GRB 180222A: Swift-XRT refined Analysis
  69. GRB 180222A: Swift-BAT refined analysis
  70. GRB 180222A: Enhanced Swift-XRT position
  71. GRB 180222A: A long GRB detected by INTEGRAL
  72. GRB 180222A: Swift detection of a burst
  73. Swift trigger 811074 (possible GRB 180221A): Swift refined analysis
  74. Swift Trigger 811167: Detection of MAXI J1813-095
  75. GRB 180205A: Mondy optical observations
  76. Swift Trigger 811074: possible GRB 180221A
  77. GRB 180218A: Fermi GBM Detection
  78. IPN Triangulation of GRB 180218A (long/bright)
  79. GRB 180204A: 15 GHz upper limits from AMI
  80. Swift trigger 810300: MASTER-OAFA robotic report
  81. GRB 180205A: SEDM Observations
  82. GRB 180210A: Swift-XRT afterglow detection
  83. GRB 180205A: BAO optical observations
  84. GRB 180210A: Fermi GBM detection
  85. Trigger 809374: Swift detection of a possible non-burst faint source
  86. Trigger 809217: Swift trigger on RS CVn Star HD 8357
  87. GRB180205A: Optical observations with DOAO 1m telescope
  88. GRB 180205A: AbAO optical observations
  89. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  90. GRB 180205A: Optical observations
  91. GRB 180205A: Swift/UVOT Detection
  92. GRB 180205A: Nanshan-1m optical observations
  93. GRB 180205A: Swift-XRT refined Analysis
  94. GRB 180205A: Swift-BAT refined analysis
  95. GRB 180205A: Further GROND Observations reveal Afterglow is still bright
  96. GRB 180205A: Nickel telescope optical observations
  97. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  98. GRB 180205A: Mondy optical observations
  99. GRB 180205A: GROND detection of the NIR/optical afterglow
  100. GRB 180205A: Swift detection of a burst with a bright optical counterpart

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