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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"

11672 results found.

  1. IPN Triangulation of GRB 180914A (long)
  2. GRB 180914B: VLT/X-shooter spectroscopic redshift
  3. GRB 180914B: AGILE/MCAL refined analysis
  4. GRB180914B: Swift UVOT detection of an optical afterglow
  5. Konus-Wind of the very bright GRB 180914B
  6. GRB 180914B: RATIR Optical and NIR Observations
  7. GRB 180914B: Swift-XRT afterglow detection
  8. GRB 180914A: RATIR Optical and NIR Observations
  9. GRB 180914B: Tiled Swift observations
  10. GRB 180914B: Fermi-LAT detection
  11. GRB 180914A: MASTER automatic inspection
  12. GRB 180914A: Swift-XRT observations
  13. GRB 180914A: Tiled Swift observations
  14. GRB 180914A: Fermi GBM detection
  15. GRB 180914A: Fermi-LAT detection
  16. Fermi-LAT Gamma-ray Observations of IceCube-180908A
  17. Fermi GBM trigger 557852757/180905629 is not a GRB
  18. Konus-Wind observation of GRB 180828A
  19. GRB 180828A: AstroSat CZTI detection
  20. GRB 180828A: Fermi GBM observation
  21. Fermi GBM trigger 557014342/180826925 is not a GRB
  22. Fermi GBM trigger 557008382/180826856 is not a GRB
  23. GRB 180818B: 1.5m OSN optical afterglow candidate
  24. GRB180806A: confirmation of the X-ray afterglow
  25. GRB 180818B: Fermi GBM observations
  26. GRB 180812A: Fermi GBM detection
  27. Konus-Wind observation of GRB 180809B
  28. MASTER: OT detection during two Fermi GBM triggers (555263883 and 555263883) error boxes inspection in 22.5 mag SDSS galaxy direction
  29. GRB 180806A: AstroSat CZTI detection
  30. Konus-Wind observation of GRB 180806A
  31. GRB 180809A: Fermi GBM observation
  32. GRB 180809A: CALET Gamma-Ray Burst Monitor detection
  33. GRB 180728A: AstroSat CZTI detection
  34. GRB180806A: correction to Circular 23097
  35. GRB 180723A: AstroSat CZTI detection
  36. GRB 180806A: NOT optical observations
  37. GRB 180806A: Swift-XRT afterglow detection
  38. GRB 180806A/180806.98: RATIR Optical Observations of MASTER OT J004613.05+242014.1
  39. GRB 180806A: Fermi GBM detection
  40. GRB 180806A/180806.94: Refined COATLI Photometry of MASTER OT J004613.05+242014.1
  41. GRB 180806A: Swift ToO observations
  42. GRB 180806.94: COATLI Detection of MASTER OT J004613.05+242014.1 and Confirmation of Fading
  43. GRB 180806.94: MASTER possible OT detection in Fermi GMB trigger 555287944 error box
  44. GRB 180805B: Fermi GBM detection
  45. Fermi Trigger 554765006: MASTER optical inspection
  46. Fermi GBM trigger 554730582/180731493 is not a GRB
  47. Konus-Wind observation of the bright nearby GRB 180728A
  48. GRB 180703B: CALET CAL gamma-ray analysis
  49. GRB 180728B: Fermi GBM detection
  50. IPN Triangulation of GRB 180728B (short)
  51. GRB 180728A: Fermi GBM observation
  52. GRB 180727A: Fermi GBM observation
  53. GRB 180727A: Swift detection of a burst
  54. GRB 180720B: CALET Gamma-Ray Burst Monitor detection
  55. GRB 180720B: OAJ optical observations
  56. GRB 180722B: Insight-HXMT/HE detection
  57. GRB 180724A: Insight-HXMT/HE detection
  58. GRB 180720B long follow up requested
  59. GRB 180723A: Fermi GBM detection
  60. GRB 180718B: Swift-XRT observations
  61. GRB 180723A: CALET Gamma-Ray Burst Monitor detection
  62. GRB 180722B: CALET Gamma-Ray Burst Monitor detection
  63. GRB 180723.13: MASTER optical observation of the short Fermi GBM trigger number 554008254
  64. GRB 180723.76: MASTER optical observation of the bright long Fermi GBM trigger number 554062193
  65. GRB 180720B: ISON-Castelgrande optical observations
  66. GRB 180715B: AstroSat CZTI detection
  67. GRB 180715A: AstroSat CZTI detection
  68. Konus-Wind observation of GRB 180720B
  69. Fermi Trigger 553879512: MASTER optical observation
  70. GRB 180720B: MAXI/GSC detection
  71. GRB 180720C: Fermi GBM observation
  72. GRB 180720B: OSN detection, fading slower?
  73. GRB 180720B: Fermi GBM observation
  74. GRB 180720B : Fermi-LAT detection
  75. GRB 180720A: Fermi GBM observation
  76. GRB 180718A: MASTER optical observation
  77. GRB180715B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 553369644)
  78. GRB 180718B: Fermi GBM detection
  79. GRB 180718B: Swift ToO observations
  80. GRB 180718B: Fermi-LAT detection
  81. GRB 180718A: Fermi GBM detection
  82. GRB 180718A short GRB detected by IPN and found in ground analysis of BAT data
  83. GRB 180715A: CALET Gamma-Ray Burst Monitor detection
  84. GRB 180715A: Fermi GBM detection
  85. IceCube-171106A: MASTER optical observation
  86. GRB 180703A: optical afterglow confirmation
  87. GRB 180703B: further analysis of CGBM data
  88. GRB 180703A: Swift-XRT afterglow detection
  89. Konus-Wind observation of GRB 180703A
  90. GRB 180703A: MASTER optical observation
  91. IPN Triangulation of GRB 180703A
  92. GRB 180706A: Fermi GBM observation
  93. Konus-Wind observation of GRB 180703B
  94. IPN Triangulation of GRB 180703B
  95. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  96. GRB 180703A: AstroSat CZTI detection
  97. GRB 180703A: Swift/UVOT Upper Limits
  98. GRB 180703B: Fermi GBM detection
  99. GRB 180703A: Fermi GBM detection
  100. GRB 180703A: LCO Sutherland possible optical candidate

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