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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"

27288 results found.

  1. GRB 180821A: BOOTES-3/YA optical observations
  2. GRB 180821A: Swift detection of a burst
  3. GRB180806A: confirmation of the X-ray afterglow
  4. GRB 180818B: Swift-XRT refined Analysis
  5. GRB 180818B: Swift-BAT refined analysis
  6. GRB 180818A: Swift-BAT refined analysis
  7. GRB 180818B: Fermi GBM observations
  8. GRB 180818B: Swift/UVOT Upper Limits
  9. GRB 180818A: Swift/UVOT Upper Limits
  10. GRB 180818B: Swift detection of a burst
  11. GRB 180818A: Swift-XRT refined Analysis
  12. GRB 180818A: Swift detection of a burst
  13. Swift Trigger 853790 is probably not an astrophysical source
  14. GRB 180728A: discovery of the associated supernova
  15. GRB 180809A: further Swift/XRT observations
  16. GRB 180812A: Swift/UVOT Detection
  17. GRB 180812A: Swift-BAT refined analysis
  18. GRB 180812A: Fermi GBM detection
  19. GRB 180812A: Swift-XRT refined Analysis
  20. GRB 180812A: COATLI Detection and Light Curve
  21. GRB 180812A: BOOTES-5/JGT optical afterglow detection
  22. GRB 180812A: Swift detection of a burst
  23. MASTER: OT detection during two Fermi GBM triggers (555263883 and 555263883) error boxes inspection in 22.5 mag SDSS galaxy direction
  24. GRB 180809B: Swift-XRT refined Analysis
  25. GRB 180809B, Swift-BAT refined analysis
  26. Swift Trigger 852625: Swift/BAT/XRT/UVOT observations
  27. GRB 180809B: Swift/UVOT Detection
  28. GRB 180809A: Fermi GBM observation
  29. GRB 180809A: CALET Gamma-Ray Burst Monitor detection
  30. GRB 180809B: CALET Gamma-Ray Burst Monitor detection
  31. Swift Trigger 852625: a possible GRB
  32. GRB180809B: MASTER Triple Independent Automatic OT Detection
  33. GRB 180809B: LCO Sutherland observations
  34. GRB 180809B: GROND Detection of the NIR Afterglow
  35. GRB 180809B: RATIR Optical Observations and Confirmation of Rapid Fading
  36. GRB180809B: MASTER OT observation
  37. GRB 180809A: iTelescope optical limit
  38. GRB 180809B: Swift detection of a burst with an optical afterglow
  39. GRB 180806A/180806.98: RATIR Optical Observations of MASTER OT J004613.05+242014.1
  40. GRB 180806A: Fermi GBM detection
  41. GRB 180806A/180806.94: Refined COATLI Photometry of MASTER OT J004613.05+242014.1
  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: ESO/NTT optical observations
  45. GRB 180805B: COATLI Optical Observations
  46. GRB 180805B: 1.5m OSN I-band observation
  47. GRB 180805B: MASTER optical late inspection short GRB with extended emission
  48. GRB 180805A: Swift-XRT refined Analysis
  49. GRB 180805B: Swift-XRT refined Analysis
  50. GRB 180805B: Swift-BAT refined analysis (short GRB with extended emission)
  51. GRB 180805A: Swift-BAT refined analysis
  52. GRB 180805B: Swift/UVOT Upper Limits
  53. GRB 180805B: Fermi GBM detection
  54. GRB 180805B: Swift detection of a burst
  55. GRB 180805A: Swift detection of a burst
  56. Fermi Trigger 554765006: MASTER optical inspection
  57. FRB 180725A: MASTER optical observations of the Fast Radio Burst error box
  58. Fermi GBM trigger 554730582/180731493 is not a GRB
  59. GRB 180728A: A long GRB of the X-ray flash (XRF) subclass, expecting supernova appearance
  60. GRB 180728B: MASTER optical observations short GRB IPN error box
  61. GRB 180728A: Swift/UVOT Detection
  62. GRB 180701A/MAXI J2119-045: CALET Gamma-Ray Burst Monitor data search
  63. GRB 180727A: Swift/UVOT Upper Limits
  64. GRB 180715A: CALET CAL gamma-ray analysis
  65. GRB 180703B: CALET CAL gamma-ray analysis
  66. GRB 180728B: Fermi GBM detection
  67. IPN Triangulation of GRB 180728B (short)
  68. GRB 180728A: Swift-BAT refined analysis
  69. GRB 180728A: Fermi GBM observation
  70. GRB 180728A: Swift-XRT refined Analysis
  71. GRB 180728A: Swift-XRT observations
  72. GRB 180728A: MASTER OT (= new object) detection
  73. GRB 180727A: Swift-BAT refined analysis
  74. GRB 180728A: Swift detection of a bright burst
  75. GRB 180727A: Swift-XRT refined Analysis
  76. GRB 180727A: Fermi GBM observation
  77. GRB 180727A: Swift detection of a burst
  78. GRB 180720B: CALET Gamma-Ray Burst Monitor detection
  79. NuSTAR observations of GRB 180720B
  80. GRB 180720B: OAJ optical observations
  81. GRB 180722B: Insight-HXMT/HE detection
  82. GRB 180724A: Insight-HXMT/HE detection
  83. GRB 180723A: Fermi GBM detection
  84. GRB 180723A: CALET Gamma-Ray Burst Monitor detection
  85. GRB 180722B: CALET Gamma-Ray Burst Monitor detection
  86. GRB 180723.13: MASTER optical observation of the short Fermi GBM trigger number 554008254
  87. GRB 180722A: MASTER second inspection
  88. GRB 180723.76: MASTER optical observation of the bright long Fermi GBM trigger number 554062193
  89. GRB 180720B: D50 optical observations
  90. GRB 180720B: MASTER Global Net OT observations
  91. GRB 180720B: Testing the universality of the newly born neutron star in BdHNe
  92. GRB 180721A: BOOTES-5/JGT optical observations
  93. GRB 180720B: COATLI Optical Detection
  94. GRB 180720C: BOOTES-2/TELMA optical observations
  95. GRB 180721A: Swift/UVOT Upper Limits
  96. GRB 180715B: AstroSat CZTI detection
  97. FRB 180714: MASTER optical inspection of the Fast Rado Burst Transient
  98. GRB 180720C: MASTER optical observation
  99. ANTARES neutrino Alert180713.02: MASTER optical observation
  100. Fermi Trigger 553879512: MASTER optical observation

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