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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"

19663 results found.

  1. GRB 220319A: LCO Optical Upper Limit
  2. GRB 220319A: Mondy optical uper limit
  3. GRB 220319A: Swift-XRT refined Analysis
  4. GRB 220319A: Enhanced Swift-XRT position
  5. GRB 220319A: MASTER Global Robotic Net optical observations
  6. GRB 220319A: Swift detection of a burst
  7. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  8. GRB 220306B: Swift/UVOT Upper Limits
  9. GRB 220310C: Fermi GBM observation
  10. GRB 210722A: TAROT Reunion observatory optical light curve
  11. GRB 210222B: TAROT Reunion observatory optical light curve
  12. GRB 201021C: TAROT Reunion observatory optical light curve
  13. GRB 220310C: Swift-XRT observations
  14. GRB 220310C: Swift ToO observations
  15. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  16. GRB 220306B: Nanshan/NEXT optical upper limit
  17. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  18. Fermi GBM Detection of GRB 220308A
  19. GRB 220308A: AGILE detection
  20. GRB 220310A: Swift ToO observations
  21. Konus-Wind detection of GRB 220308A
  22. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  23. IPN triangulation of GRB 220308A (long / very bright)
  24. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  25. GRB 220306B: Tautenburg observations
  26. GRB 220304A Fermi GBM detection
  27. GRB 220306B: Swift-BAT refined analysis
  28. GRB 220306B: AbAO optical observations, possible afterglow candidate
  29. GRB 220306B: BOOTES-1 optical upper limit
  30. GRB 220306B: Swift-XRT refined Analysis
  31. GRB 220306B: Fermi GBM observation
  32. GRB 220306B: Enhanced Swift-XRT position
  33. Swift GRB 220306B: Global MASTER-Net observations report
  34. GRB 220305A: Swift-BAT refined analysis
  35. GRB 220306B: Swift detection of a burst
  36. Fermi GBM Sub-Threshold Detection of GRB 220305A
  37. GRB 220305A: Swift-XRT refined Analysis
  38. GRB 220305A: Enhanced Swift-XRT position
  39. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  40. Swift GRB 220305A: Global MASTER-Net observations report
  41. GRB 220305A: Swift-XRT observations
  42. GRB 220305A: Swift detection of a burst
  43. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  44. GRB 220302A: Swift/UVOT Upper Limits
  45. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  46. GRB 220302A: Swift-XRT refined Analysis
  47. GRB 220302A: BOOTES-5/JGT optical upper limit
  48. Swift resumes autonomous slewing
  49. GRB 220302A: Enhanced Swift-XRT position
  50. GRB 220302A: Swift afterglow detection
  51. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  52. Swift GRB 220302A: Global MASTER-Net observations report
  53. GRB 220302A: Swift detection of a burst
  54. GRB 220228A: Fermi-LAT detection
  55. Konus-Wind detection of GRB 220222A
  56. IPN triangulation of GRB 220222A
  57. GCN Circ.draft on GRB 220222A
  58. GRB 220219B: Swift-XRT observations
  59. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  60. GRB 220219B: Swift ToO observations
  61. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  62. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  63. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  64. GRB 220218A: BOOTES-5/JGT optical upper limit
  65. GRB 220218A: Swift detection of a burst
  66. Swift GRB220218.94: Global MASTER-Net observations report
  67. Swift resumes pointed science observations
  68. Konus-Wind detection of GRB 220211A
  69. GRB 220211A: Fermi GBM observation
  70. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  71. IPN triangulation of GRB 220211A (short)
  72. GRB 220210A: Insight-HXMT/HE detection
  73. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  74. GRB 220210A: 1.5m OSN optical upper limit
  75. GRB 220210A: Fermi GBM detection
  76. GRB 220210A: Fermi-LAT detection
  77. GRB 220210A: AGILE detection
  78. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  79. GRB 220210A: Swift/BAT-GUANO localization
  80. GRB 210919A: Maidanak optical observations
  81. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  82. Konus-Wind detection of GRB 220203A
  83. GRB 220203A: GECAM detection
  84. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  85. IPN triangulation of GRB 220203A (short)
  86. IPN triangulation of GRB 220130A
  87. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  88. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  89. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  90. IPN triangulation of GRB 220128A (long)
  91. IPN triangulation of GRB 220124A
  92. GRB 220117A: Terskol and AbAO optical upper limits
  93. GRB 220118A: TARGET optical upper limit
  94. GRB 220117B: TARGET optical upper limit
  95. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  96. IPN triangulation of GRB 211226A
  97. GRB 220117C: Fermi GBM Observation
  98. GRB 220118A: 2.2m CAHA/CAFOS detections
  99. GRB 220118A: Fermi GBM detection
  100. GRB 220118A: COATLI Optical Observations

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