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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"

21035 results found.

  1. GRB 180325A: Global MASTER-Net OT prompt observations
  2. GRB 180325A: TAROT Calern observatory optical observations
  3. GRB 180325A: RATIR Optical Observations
  4. GRB 180325A: prompt REM optical/NIR detection
  5. GRB 180325A: NOT redshift
  6. GRB 180325A: prompt LT observations
  7. GRB 180324A: Swift/UVOT Upper Limits
  8. GRB 180324A: RATIR Optical Observations and Possible Afterglow Detection
  9. GRB 180324A: KAIT Optical Upper Limit
  10. GRB 180316A: RATIR Optical Observations
  11. GRB 180316A: TSHAO optical observations
  12. GRB 180316A: RATIR Optical Observations, Possible Re-brightening
  13. GRB 180316A: Swift/UVOT Detection
  14. GRB 180316A: RATIR Optical Observations
  15. GRB 180316A: LCO Cerro Tololo observations
  16. GROND observations of GRB 180316A
  17. GRB180316A: MASTER-IAC OT light curve
  18. GRB180316A: MASTER-IAC optical detection
  19. GRB 180314B: RATIR Optical Observations
  20. GRB 180314B: Swift/UVOT Upper Limits
  21. GRB 180314A: TAROT La Silla observatory optical observations
  22. GRB 180314A: LCO Siding Springs observations
  23. GRB 180314A: VLT/X-shooter redshift
  24. GRB 180314A: Swift/UVOT Detection
  25. GRB 180314A: REM optical/NIR observations
  26. GRB 180314A: MASTER-Net OT dtetction
  27. GRB180314A: GROND detection of the afterglow
  28. GRB 180311A: Swift/UVOT Upper Limits
  29. Trigger 813449: Swift detection of large burst from XTE J1701-407
  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. GRB 180305A: RATIR Optical Afterglow Candidate
  35. GRB 180305A: Swift ToO observations
  36. GRB 180224A: Swift/UVOT Detection
  37. GRB 180224A: OASDG optical observations
  38. GRB 180224A: AbAO optical observations
  39. GRB 180224A: RATIR Optical Observations
  40. GRB180224A: Global MASTER-Net bright OT detection
  41. MAXI J1813-095 source: AbAO optical observations
  42. GRB 180222A: Swift/UVOT Upper Limits
  43. Swift trigger 811074 (possible GRB 180221A): Swift refined analysis
  44. GRB 180205A: Mondy optical observations
  45. GRB180221A: MASTER-OAFA optical observations
  46. Swift Trigger 811074: possible GRB 180221A
  47. GRB 180204A: 15 GHz upper limits from AMI
  48. Swift J1658.2-4242: Swift BAT and XRT refined analysis
  49. Swift trigger 810300: MASTER-OAFA robotic report
  50. Swift J1658.2-4242 (trigger 810300): Swift-XRT position
  51. GRB 180205A: SEDM Observations
  52. GRB 180210A: Swift-XRT afterglow detection
  53. GRB 180210A: Tiled Swift observations
  54. GRB 180205A: BAO optical observations
  55. GRB 180210A: Swift ToO observations
  56. GRB180205A: Optical observations with DOAO 1m telescope
  57. GRB 180205A: AbAO optical observations
  58. GRB 180205A optical observations
  59. GRB 180205A: Optical observations
  60. GRB 180205A: Swift/UVOT Detection
  61. GRB 180205A: Nanshan-1m optical observations
  62. GRB 180205A: Further GROND Observations reveal Afterglow is still bright
  63. GRB 180205A: Nickel telescope optical observations
  64. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  65. GRB 180205A: VLT polarimetry
  66. GRB 180205A: Mondy optical observations
  67. GRB 180205A: VLT/X-shooter redshift
  68. GRB 180205A: GROND detection of the NIR/optical afterglow
  69. GRB 180205A: KAIT optical afterglow confirmation
  70. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  71. GRB 180204A: Swift/UVOT Upper Limits
  72. GW170817/GRB170817A: Updated results from the full Chandra dataset
  73. GW170817/GRB170817A: Preliminary results of Chandra monitoring
  74. LIGO/Virgo GW170817: Chandra X-ray Emission Continues to Rise ~156 Days Post-Merger
  75. LIGO/Virgo G298048 GRAWITA: VST-ESO PARANAL follow up of AT2017gfo
  76. GRB 180115A: SEDM Observations
  77. GRB 180115A: Swift/UVOT Detection
  78. e-MERLIN detection of GRB 171205A
  79. GRB 180113A: Swift ToO observations
  80. GRB 180111A: AbAO optical observations
  81. GRB 180113A: KAIT Optical Observations
  82. GRB 180111A: Swift/UVOT Detection
  83. GRB 180103A: Swift-XRT afterglow detection
  84. GRB 180111A: RATIR Optical and NIR Observations
  85. GRB 180103A: LCO Sutherland 1-m telescope observations
  86. GRB 180103A: Swift/UVOT Upper Limits
  87. GRB 180103A: Swift-XRT observations
  88. GRB 180103A: Swift ToO observations
  89. GRB 180103A: Swift detection of a burst
  90. VLBA detection of GRB 171205A
  91. GRB 180102A: Swift/UVOT Upper Limits
  92. GRB 180102A: NOT optical observations
  93. GRB 180102A: MASTER-Net robotic report
  94. GRB 171222A: Nanshan-0.36m optical upper limit
  95. GRB 171222A: Swift/UVOT Upper Limits
  96. GRB 171222A: MASTER-Net OT observations
  97. GRB 171222A: Redshift from 10.4m GTC/OSIRIS
  98. GRB 171222A: NOT Optical Afterglow
  99. GMRT Radio detection of GRB 171205A
  100. GRB 171216A: Swift/UVOT Upper Limits

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