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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"

27220 results found.

  1. Fermi GBM trigger 484906918/160514349 is not a GRB
  2. GRB 160509A: Further VLA Observations
  3. GRB 160509A MASTER-NET observations
  4. GRB 160509A: CALET Gamma-Ray Burst Monitor detection
  5. GRB 160509A: non-observation of VHE emission with HAWC
  6. GRB 160508A: CALET Gamma-Ray Burst Monitor detection
  7. Fermi GBM trigger 484574960/160510506 is not a GRB
  8. GRB 160509A: DCT Imaging / Afterglow Confirmation
  9. GRB 160509A: Fermi-LAT refined analysis
  10. GRB 160509A: Swift/UVOT Upper Limit
  11. GRB 160509A: Fermi GBM Detection
  12. GRB 160509A: optical observations
  13. GRB 160509A: Fermi-LAT prompt detection of a very bright burst
  14. GRB 160506A: TAROT La Silla observatory optical observations
  15. LIGO/Virgo G211117: Astrosat CZTI upper limits
  16. GRB 160506A: Swift-XRT refined Analysis
  17. GRB 160506A: Swift/UVOT Upper Limits
  18. GRB 160506A: Swift-BAT refined analysis
  19. GRB 160506A: GROND upper limits
  20. GRB 160506A: Swift detection of a burst
  21. GRB 160504A: Swift-BAT refined analysis
  22. IceCube-160427A: iPTF Observations
  23. GRB 160504A: RATIR Optical and NIR Observations
  24. GRB 160504A: Swift/UVOT Upper Limits
  25. GRB160504A: Gemini NIR Observations
  26. GRB 160504A: Bassano Bresciano Observatory upper limits
  27. GRB 160504A: Swift-XRT refined Analysis
  28. GRB 160504A: NOT upper limits
  29. GRB 160504A: TAROT Calern observatory optical observations
  30. GRB 160504A: Swift detection of a burst
  31. GRB 160503A: Fermi GBM observation
  32. GRB 160503A: Fermi-LAT detection
  33. GRB 160501A: Swift-BAT refined analysis
  34. GRB 160501A: GROND Upper limits
  35. GRB 160501A: Swift/UVOT Upper Limits
  36. GRB 160501A: Swift-XRT refined Analysis
  37. GRB 160501A: RATIR Optical and NIR Observations
  38. GRB 160501A: TAROT Calern observatory optical observations
  39. GRB 160501A MASTER-NET early observations
  40. GRB 160501A: Swift detection of a burst
  41. IceCube-160427A: Fermi GBM Observations
  42. MASTER search for counterpart to the IceCube event 67093193 (run 127853)
  43. GRB 160422A: XRT Afterglow Confirmation
  44. GRB 160425A: Swift/UVOT Detection
  45. GRB 160425A: Skynet PROMPT-CTIO observations of the optical afterglow
  46. GRB 160425A: Swift-BAT refined analysis
  47. GRB 160325A: Skynet PROMPT-CTIO observations of the optical afterglow
  48. GRB 160422A: GROND NIR afterglow detection
  49. GRB 160425A MASTER notices: possible host galaxy in the optical error-box
  50. GRB 160425A: GROND observation
  51. GRB 160425A: Swift-XRT refined Analysis
  52. GRB 160422A: Swift/UVOT Afterglow Confirmation
  53. GRB 160422A: CALET Gamma-Ray Burst Monitor detection
  54. GRB 160425A : MASTER earlier optical observations
  55. GRB 160425A: Swift detection of an unusual burst with an optical afterglow
  56. Konus-Wind observation of GRB 160424A
  57. LIGO/Virgo G197392 / LVT151012: Identification of a GW CBC Candidate
  58. GRB 160424A: Fermi GBM observation
  59. GRB 160424A: Swift-BAT refined analysis
  60. GRB 160424A: Swift/UVOT Upper Limit
  61. GRB 160424A: Swift-XRT observations
  62. GRB 160424A: Swift detection of a burst
  63. GRB 160422A: Swift/UVOT Candidate Afterglow
  64. GRB 160419A: CALET Gamma-Ray Burst Monitor detection
  65. GRB 160422A: Fermi GBM observation
  66. GRB 160422A: Fermi-LAT Detection
  67. GRB 160419A, Swift-BAT refined analysis
  68. GRB 160419A: Fermi GBM detection
  69. GRB 160419A: Swift detection of a burst
  70. Fermi GBM trigger 482632364/160418023 is not a GRB
  71. GRB 160417A: GMG observations
  72. GRB 160417A: Swift-BAT refined analysis
  73. GRB 160417A: Swift/UVOT Detection
  74. GRB 160417A: Swift-XRT refined Analysis
  75. GRB 160417A: KAIT optical afterglow confirmation
  76. GRB 160417A: Swift detection of a burst with an optical counterpart
  77. LIGO/Virgo G211117: EWE for NOWT of 12 days follow-up of northern sky
  78. GRB 160412A: GROND upper limits
  79. LIGO Virgo G211117: Additional MWA Observations
  80. GRB 160410A: TLS Tautenburg observations
  81. GRB 160412A: Swift/UVOT Upper Limits
  82. Swift Trigger 682614 is not a GRB
  83. GRB 160410A: JCMT SCUBA-2 sub-mm observation
  84. GRB 160409A found in Swift BAT ground analysis
  85. GRB 160412A: Swift-XRT refined Analysis
  86. GRB 160411A: Swift-BAT refined analysis of the short burst
  87. GRB 160412A: Swift-BAT refined analysis
  88. GRB 160412A: Swift detection of a burst
  89. GRB 160408A: CALET Gamma-Ray Burst Monitor detection
  90. GRB 160411A: Gemini-S optical observations
  91. GRB 160411A: GROND Optical/NIR upper limits
  92. GRB 160411A: Swift/UVOT Upper Limits
  93. GRB 160411A: Fermi GBM detection
  94. GRB 160410A: TAROT La Silla observatory early optical observations
  95. GRB 160411A: Swift-XRT refined Analysis
  96. GRB 160411A: MASTER-NET early optical observations.
  97. GRB 160410A: Swift-XRT refined Analysis
  98. GRB 160411A: Swift-XRT observations
  99. GRB 160410A: GMG observation
  100. GRB 160411A: Swift detection of a short burst

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