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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"

37750 results found.

  1. GRB 180314B: Zeiss-1000/CrAO optical upper limit
  2. GRB 180314B: Swift/UVOT Upper Limits
  3. GRB 180314B: Swift-XRT refined Analysis
  4. GRB 180314B: Enhanced Swift-XRT position
  5. GRB 180313A: Fermi GBM detection
  6. GRB 180314B: Prompt enhanced Swift-XRT position
  7. GRB 180314B: Swift detection of a burst
  8. GRB 180314A: Swift-BAT refined analysis
  9. Swift Trigger on MAXI J1820+070
  10. GRB 180314A: TAROT La Silla observatory optical observations
  11. GRB 180314A: LCO Siding Springs observations
  12. GRB 180314A: Swift-XRT refined Analysis
  13. GRB 180314A: Fermi GBM observation
  14. GRB 180314A: VLT/X-shooter redshift
  15. GRB 180314A: Swift/UVOT Detection
  16. GRB 180314A: REM optical/NIR observations
  17. GRB 180314A: MASTER-Net OT dtetction
  18. GRB 180314A: Enhanced Swift-XRT position
  19. GRB180314A: GROND detection of the afterglow
  20. GRB 180314A: Swift detection of a burst with an optical counterpart
  21. GRB 180305A: AstroSat CZTI detection
  22. GRB 180311A: Swift/UVOT Upper Limits
  23. GRB 180311A, Swift-BAT refined analysis
  24. GRB 180311A: Swift-XRT refined Analysis
  25. Swift detection of MAXI J1820+070
  26. GRB 180311A: Enhanced Swift-XRT position
  27. GRB 180311A: Prompt enhanced Swift-XRT position
  28. GRB 180311A: Swift detection of a burst
  29. GRB 180305A CALET Gamma-Ray Burst Monitor detection
  30. GRB 180305A: RATIR Optical Observations
  31. GRB 180305A: Swift/UVOT Upper Limits
  32. GRB 180305A: Mondy optical observations
  33. GRB 180305A: Swift-XRT afterglow detection
  34. Konus-Wind observation of GRB 180305A
  35. GRB 180305A: RATIR Optical Afterglow Candidate
  36. GRB 180305A: Swift ToO observations
  37. GRB 180305A: Fermi GBM detection
  38. GRB 180305A: Fermi-LAT detection
  39. GRB 180221B: Insight-HXMT/HE observation
  40. Fermi GBM trigger 541402602/180227234 is not a GRB
  41. GRB 180224A: Swift/UVOT Detection
  42. Konus-Wind observation of GRB 180223A
  43. GRB 180224A: OASDG optical observations
  44. IPN Triangulation of GRB 180223A (long)
  45. GRB 180210A: Insight-HXMT/HE observation
  46. GRB 180224A: AbAO optical observations
  47. GRB 180224A: Swift-BAT refined analysis
  48. GRB 180224A: RATIR Optical Observations
  49. GRB 180224A: Swift-XRT refined Analysis
  50. GRB 180224A: Enhanced Swift-XRT position
  51. GRB 180224A: Swift detection of a burst with an optical counterpart
  52. GRB 180218A: AstroSat CZTI detection
  53. MAXI J1813-095 source: AbAO optical observations
  54. GRB 180222A: Swift/UVOT Upper Limits
  55. GRB 180221B CALET Gamma-Ray Burst Monitor detection
  56. GRB 180222A: Swift-XRT refined Analysis
  57. GRB 180222A: Swift-BAT refined analysis
  58. GRB 180222A: Enhanced Swift-XRT position
  59. GRB 180222A: A long GRB detected by INTEGRAL
  60. GRB 180222A: Swift detection of a burst
  61. Swift trigger 811074 (possible GRB 180221A): Swift refined analysis
  62. GRB 180205A: Mondy optical observations
  63. GRB 180219A CALET Gamma-Ray Burst Monitor detection
  64. GRB180221A: MASTER-OAFA optical observations
  65. Swift Trigger 811074: possible GRB 180221A
  66. Konus-Wind observation of GRB 180218A
  67. GRB 180218A CALET Gamma-Ray Burst Monitor detection
  68. GRB 180218A: Fermi GBM Detection
  69. IPN Triangulation of GRB 180218A (long/bright)
  70. GRB 180204A: 15 GHz upper limits from AMI
  71. GRB 180112A: AstroSat CZTI detection
  72. Fermi GBM triggers 540405116/180215689 and 540476225/180216512 are not a GRBs
  73. Konus-Wind observation of GRB 180210A
  74. GRB 180205A: SEDM Observations
  75. GRB 180210A: Swift-XRT afterglow detection
  76. GRB 180210A: Tiled Swift observations
  77. GRB 180205A: BAO optical observations
  78. GRB 180210A: Swift ToO observations
  79. GRB 180210A: Fermi-LAT detection
  80. GRB 180210A: Fermi GBM detection
  81. Trigger 809217: Swift trigger on RS CVn Star HD 8357
  82. GRB180205A: Optical observations with DOAO 1m telescope
  83. GRB 180205A: AbAO optical observations
  84. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  85. GRB 180205A optical observations
  86. GRB 180202A: Insight-HXMT/HE detection
  87. GRB 180204A: MITSuME Okayama optical upper limits
  88. GRB 180205A: confirmation of Swift-BAT trigger time.
  89. GRB 180205A: Optical observations
  90. GRB 180205A: Swift/UVOT Detection
  91. GRB 180205A: Nanshan-1m optical observations
  92. GRB 180205A: Swift-XRT refined Analysis
  93. GRB 180205A: Swift-BAT refined analysis
  94. GRB 180205A: Xinglong TNT optical observation
  95. GRB 180205A: Further GROND Observations reveal Afterglow is still bright
  96. GRB 180205A: Nickel telescope optical observations
  97. GRB 180205A: VLT polarimetry
  98. GRB 180205A: Mondy optical observations
  99. GRB 180205A: Fermi GBM observation
  100. Konus-Wind observation of GRB 180204A

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