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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"

21046 results found.

  1. GRB 180329B: VLT/X-shooter spectroscopic observations
  2. GRB 180329B: Swift/UVOT Detection
  3. GRB 180329B: RATIR Optical Observations
  4. GRB 180329B: NOT optical afterglow detection
  5. GRB 180329A: Swift-BAT refined analysis
  6. GRB 180329B: Swift detection of a burst with an optical afterglow
  7. Swift Trigger 819301: possible GRB 180329A
  8. GRB 180325A: VLT/X-shooter spectroscopic observations
  9. GRB 180325A: further NOT observations
  10. GRB 180325A: Swift/UVOT Detection
  11. GRB 180325A: GROND observations
  12. GRB 180325A: Global MASTER-Net OT prompt observations
  13. GRB 180325A: TAROT Calern observatory optical observations
  14. GRB 180325A: RATIR Optical Observations
  15. GRB 180325A: prompt REM optical/NIR detection
  16. GRB 180325A: NOT redshift
  17. GRB 180325A: prompt LT observations
  18. GRB 180324A: Swift/UVOT Upper Limits
  19. GRB 180324A: RATIR Optical Observations and Possible Afterglow Detection
  20. GRB 180324A: KAIT Optical Upper Limit
  21. GRB 180316A: RATIR Optical Observations
  22. GRB 180316A: TSHAO optical observations
  23. GRB 180316A: RATIR Optical Observations, Possible Re-brightening
  24. GRB 180316A: Swift/UVOT Detection
  25. GRB 180316A: RATIR Optical Observations
  26. GRB 180316A: LCO Cerro Tololo observations
  27. GROND observations of GRB 180316A
  28. GRB180316A: MASTER-IAC OT light curve
  29. GRB180316A: MASTER-IAC optical detection
  30. GRB 180314B: RATIR Optical Observations
  31. GRB 180314B: Swift/UVOT Upper Limits
  32. GRB 180314A: TAROT La Silla observatory optical observations
  33. GRB 180314A: LCO Siding Springs observations
  34. GRB 180314A: VLT/X-shooter redshift
  35. GRB 180314A: Swift/UVOT Detection
  36. GRB 180314A: REM optical/NIR observations
  37. GRB 180314A: MASTER-Net OT dtetction
  38. GRB180314A: GROND detection of the afterglow
  39. GRB 180311A: Swift/UVOT Upper Limits
  40. Trigger 813449: Swift detection of large burst from XTE J1701-407
  41. GRB 180305A: RATIR Optical Observations
  42. GRB 180305A: Swift/UVOT Upper Limits
  43. GRB 180305A: Mondy optical observations
  44. GRB 180305A: Swift-XRT afterglow detection
  45. GRB 180305A: RATIR Optical Afterglow Candidate
  46. GRB 180305A: Swift ToO observations
  47. GRB 180224A: Swift/UVOT Detection
  48. GRB 180224A: OASDG optical observations
  49. GRB 180224A: AbAO optical observations
  50. GRB 180224A: RATIR Optical Observations
  51. GRB180224A: Global MASTER-Net bright OT detection
  52. MAXI J1813-095 source: AbAO optical observations
  53. GRB 180222A: Swift/UVOT Upper Limits
  54. Swift trigger 811074 (possible GRB 180221A): Swift refined analysis
  55. GRB 180205A: Mondy optical observations
  56. GRB180221A: MASTER-OAFA optical observations
  57. Swift Trigger 811074: possible GRB 180221A
  58. GRB 180204A: 15 GHz upper limits from AMI
  59. Swift J1658.2-4242: Swift BAT and XRT refined analysis
  60. Swift trigger 810300: MASTER-OAFA robotic report
  61. Swift J1658.2-4242 (trigger 810300): Swift-XRT position
  62. GRB 180205A: SEDM Observations
  63. GRB 180210A: Swift-XRT afterglow detection
  64. GRB 180210A: Tiled Swift observations
  65. GRB 180205A: BAO optical observations
  66. GRB 180210A: Swift ToO observations
  67. GRB180205A: Optical observations with DOAO 1m telescope
  68. GRB 180205A: AbAO optical observations
  69. GRB 180205A optical observations
  70. GRB 180205A: Optical observations
  71. GRB 180205A: Swift/UVOT Detection
  72. GRB 180205A: Nanshan-1m optical observations
  73. GRB 180205A: Further GROND Observations reveal Afterglow is still bright
  74. GRB 180205A: Nickel telescope optical observations
  75. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  76. GRB 180205A: VLT polarimetry
  77. GRB 180205A: Mondy optical observations
  78. GRB 180205A: VLT/X-shooter redshift
  79. GRB 180205A: GROND detection of the NIR/optical afterglow
  80. GRB 180205A: KAIT optical afterglow confirmation
  81. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  82. GRB 180204A: Swift/UVOT Upper Limits
  83. GW170817/GRB170817A: Updated results from the full Chandra dataset
  84. GW170817/GRB170817A: Preliminary results of Chandra monitoring
  85. LIGO/Virgo GW170817: Chandra X-ray Emission Continues to Rise ~156 Days Post-Merger
  86. LIGO/Virgo G298048 GRAWITA: VST-ESO PARANAL follow up of AT2017gfo
  87. GRB 180115A: SEDM Observations
  88. GRB 180115A: Swift/UVOT Detection
  89. e-MERLIN detection of GRB 171205A
  90. GRB 180113A: Swift ToO observations
  91. GRB 180111A: AbAO optical observations
  92. GRB 180113A: KAIT Optical Observations
  93. GRB 180111A: Swift/UVOT Detection
  94. GRB 180103A: Swift-XRT afterglow detection
  95. GRB 180111A: RATIR Optical and NIR Observations
  96. GRB 180103A: LCO Sutherland 1-m telescope observations
  97. GRB 180103A: Swift/UVOT Upper Limits
  98. GRB 180103A: Swift-XRT observations
  99. GRB 180103A: Swift ToO observations
  100. GRB 180103A: Swift detection of a burst

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