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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"

43961 results found.

  1. MAXI J1813-095 source: AbAO optical observations
  2. GRB 180222A: Swift/UVOT Upper Limits
  3. GRB 180221B CALET Gamma-Ray Burst Monitor detection
  4. GRB 180222A: Swift-XRT refined Analysis
  5. GRB 180222A: Swift-BAT refined analysis
  6. GRB 180222A: Enhanced Swift-XRT position
  7. GRB 180222A: A long GRB detected by INTEGRAL
  8. GRB 180222A: Swift detection of a burst
  9. Swift trigger 811074 (possible GRB 180221A): Swift refined analysis
  10. Swift Trigger 811167: Detection of MAXI J1813-095
  11. GRB 180205A: Mondy optical observations
  12. GRB 180219A CALET Gamma-Ray Burst Monitor detection
  13. GRB180221A: MASTER-OAFA optical observations
  14. Swift Trigger 811074: possible GRB 180221A
  15. Konus-Wind observation of GRB 180218A
  16. GRB 180218A CALET Gamma-Ray Burst Monitor detection
  17. GRB 180218A: Fermi GBM Detection
  18. IPN Triangulation of GRB 180218A (long/bright)
  19. GRB 180204A: 15 GHz upper limits from AMI
  20. GRB 180112A: AstroSat CZTI detection
  21. Fermi GBM triggers 540405116/180215689 and 540476225/180216512 are not a GRBs
  22. Swift J1658.2-4242: Swift BAT and XRT refined analysis
  23. Swift trigger 810300: MASTER-OAFA robotic report
  24. Swift J1658.2-4242 (trigger 810300): Swift-XRT position
  25. Swift Trigger 810300 is a probable new Galactic source: Swift J1658.2-4242
  26. Konus-Wind observation of GRB 180210A
  27. GRB 180205A: SEDM Observations
  28. GRB 180210A: Swift-XRT afterglow detection
  29. GRB 180210A: Tiled Swift observations
  30. GRB 180205A: BAO optical observations
  31. Retraction of Swift trigger 809374
  32. GRB 180210A: Swift ToO observations
  33. GRB 180210A: Fermi-LAT detection
  34. GRB 180210A: Fermi GBM detection
  35. Trigger 809374: Swift detection of a possible non-burst faint source
  36. Trigger 809217: Swift trigger on RS CVn Star HD 8357
  37. GRB180205A: Optical observations with DOAO 1m telescope
  38. GRB 180205A: AbAO optical observations
  39. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  40. GRB 180205A optical observations
  41. GRB 180202A: Insight-HXMT/HE detection
  42. GRB 180205A: confirmation of Swift-BAT trigger time.
  43. GRB 180205A: Optical observations
  44. GRB 180205A: Swift/UVOT Detection
  45. GRB 180205A: Nanshan-1m optical observations
  46. GRB 180205A: Swift-XRT refined Analysis
  47. GRB 180205A: Swift-BAT refined analysis
  48. GRB 180205A: Xinglong TNT optical observation
  49. GRB 180205A: Further GROND Observations reveal Afterglow is still bright
  50. GRB 180205A: Nickel telescope optical observations
  51. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  52. GRB 180205A: VLT polarimetry
  53. GRB 180205A: Mondy optical observations
  54. GRB 180205A: Fermi GBM observation
  55. Konus-Wind observation of GRB 180204A
  56. GRB 180205A: VLT/X-shooter redshift
  57. GRB 180205A: GROND detection of the NIR/optical afterglow
  58. GRB 180205A: KAIT optical afterglow confirmation
  59. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  60. GRB 180204A: Swift-BAT refined analysis
  61. GRB 180204A: Swift/UVOT Upper Limits
  62. GRB 180204A: Fermi GBM detection
  63. GRB 180204A: Enhanced Swift-XRT position
  64. GRB 180204A: Swift-XRT refined Analysis
  65. GRB 180204A: Swift detection of a short burst
  66. GW170817/GRB170817A: Updated results from the full Chandra dataset
  67. GRB 180126A CALET Gamma-Ray Burst Monitor detection
  68. GW170817/GRB170817A: Preliminary results of Chandra monitoring
  69. LIGO/Virgo GW170817: Chandra X-ray Emission Continues to Rise ~156 Days Post-Merger
  70. GRB 180120A: AstroSat CZTI detection
  71. Fermi GBM trigger 538030981/180119210 is not a GRB
  72. LIGO/Virgo G298048 GRAWITA: VST-ESO PARANAL follow up of AT2017gfo
  73. GRB 180120A: Fermi GBM Detection
  74. GRB 180120A CALET Gamma-Ray Burst Monitor detection
  75. Fermi GBM trigger 538316685/180122517 is not a GRB
  76. GRB 180113B: AstroSat CZTI detection
  77. GRB 180113A: AstroSat CZTI detection
  78. GRB 180115A: SEDM Observations
  79. GRB 180116A CALET Gamma-Ray Burst Monitor detection
  80. Konus-Wind observation of GRB 171209A
  81. GRB 180113A CALET Gamma-Ray Burst Monitor detection
  82. GRB 180112A CALET Gamma-Ray Burst Monitor detection
  83. GRB 180116A: Fermi GBM Detection
  84. Konus-Wind observation of GRB 180113B
  85. IPN Triangulation of GRB 180113B
  86. GRB 180112A: Insight-HXMT/HE detection/observation
  87. GRB 180111A AROMA-N optical observation
  88. Konus-Wind observation of GRB 180113C
  89. e-MERLIN detection of GRB 171205A
  90. IPN Triangulation of GRB 180113C
  91. GRB 180115A: Swift-BAT refined analysis
  92. GRB 180116A: MAXI/GSC detection
  93. GRB 180115A: Redshift from OSIRIS/GTC
  94. GRB 180115A: NOT detection of optical counterpart
  95. Konus-Wind observation of GRB 180113A
  96. GRB 180113C: Insight-HXMT/HE observation
  97. GRB 180113B: Insight-HXMT/HE observation
  98. GRB 180111A: Insight-HXMT/HE observation
  99. GRB 180113A: Swift ToO observations
  100. GRB 180115A: Swift-XRT refined Analysis

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