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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"

32689 results found.

  1. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  2. GRB 220921A: ALMA detection
  3. GRB 220921A: DDOTI Detection of the Afterglow
  4. Konus-Wind detection of GRB 220921A
  5. GRB 220921A: Fermi GBM detection
  6. IceCube-220907A: Classification of AT2022oyn as a Type Ia supernova
  7. GRB 220921A: MeerLICHT afterglow observations
  8. GRB 220921A: Swift-XRT Observations
  9. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  10. GRB 220921A: Tiled Swift observations
  11. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  12. IceCube-220918A: Upper limits from a search for additional neutrino events in IceCube
  13. IceCube-220907A: No significant detection in HAWC
  14. GRB 220909A: Fermi GBM observation
  15. Konus-Wind detection of GRB 220910A
  16. Fermi GRB 220912A: Global MASTER-Net observations report
  17. GRB 220910A: Fermi GBM observation
  18. IPN triangulation of GRB 220910A (bright/long)
  19. GRB 220912A: AstroSat CZTI detection
  20. GRB 220831A: DECam optical counterpart follow-up
  21. GRB 220909A: Swift-XRT observations
  22. IPN triangulation of GRB 220905A
  23. GRB 220909A: Swift ToO observations
  24. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  25. GRB 220831A: Gemini-South Infrared Observations
  26. GRB 220910A: AstroSat CZTI detection
  27. GRB 220907A: Swift-BAT refined analysis
  28. IceCube-220907A: One Candidate Counterpart from the Zwicky Transient Facility
  29. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  30. IPN triangulation of GRB 220903A (long)
  31. GRB 220907A: Fermi GBM observation
  32. GRB 220907A: Nanshan/NEXT optical upper limits
  33. GRB 220907A: Swift/UVOT Upper Limits
  34. GRB 220907A: Swift-XRT refined Analysis
  35. GRB 220831A: ATCA 5/9 GHz radio observations
  36. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  37. GRB 220907A: Swift-XRT position
  38. GRB 220907A: Swift detection of a burst
  39. GRB 220831A: Swift-UVOT Upper Limits
  40. Fermi GRB 220905A: Global MASTER-Net observations report
  41. Introducing Self-Service Configuration of GCN Notices over Email for Transient Alerts
  42. GRB 220831A: DECam detection of a possible optical counterpart
  43. Fermi GRB 220902A: Global MASTER-Net observations report
  44. GRB 220831A, VLT/HAWK-I near-infrared observations
  45. GRB 220831A: Fermi GBM observation
  46. GRB 220831A: Swift-XRT observations
  47. GRB 220831A: Swift ToO observations
  48. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  49. IceCube-220822A: No significant detection in HAWC
  50. Konus-Wind detection of GRB 220826A
  51. IceCube-220822A: Classification of AT2022saw as a Type Ia supernova
  52. GRB 220826A: Swift-BAT refined analysis
  53. GRB 220826A: Fermi GBM observation
  54. GRB 220826A: Swift-XRT refined Analysis
  55. GRB 220825A: Fermi GBM observation
  56. GRB 220826A: Lesedi optical afterglow detection
  57. GRB 220826A: Swift/UVOT Detection
  58. GRB 220826A: iTelescope optical afterglow observations
  59. Swift GRB 220826A: Global MASTER-Net observations report
  60. IceCube-220822A: One Candidate Counterpart from the Zwicky Transient Facility
  61. GRB 220823A: Fermi GBM detection
  62. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  63. Konus-Wind detection of GRB 220813A
  64. GRB 220813A: VLT optical observations and possible host galaxy
  65. GRB 220813A: Swift/UVOT Detection
  66. GRB 220810A: Further Swift-XRT observations
  67. GRB 220813A: Swift-XRT refined Analysis
  68. Swift GRB 220813A: Global MASTER-Net observations report
  69. GRB 220810A: Swift-XRT observations
  70. GRB 220810A: Swift ToO observations
  71. GRB 220810A: MeerLICHT detection of two afterglow candidates
  72. Fermi GRB 220810A: Global MASTER-Net observations report
  73. GRB 220627A: MeerKAT radio observations
  74. GRB 220806A: Swift-BAT refined analysis
  75. Konus-Wind detection of GRB 220730A (short)
  76. GRB 220730A: Swift-BAT refined analysis
  77. GRB 220730A: Fermi GBM detection
  78. GRB 220730A: Swift-XRT afterglow detection
  79. GRB 220730A: Swift/UVOT Upper Limits
  80. GRB 220730A: Swift-XRT observations
  81. Swift GRB 220730A: Global MASTER-Net observations report
  82. Fermi GRB 220728A: Global MASTER-Net observations report
  83. Fermi GRB 220724A: Global MASTER-Net observations report
  84. GRB 220715B: VIRT Optical Upper Limit
  85. Fermi GRB 220721A: Global MASTER-Net observations report
  86. Introducing new GCN Kafka broker and web site for transient alerts, https://gcn.nasa.gov
  87. Retraction: Fermi GBM trigger 679932336.585264/220719587 is not a GRB
  88. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  89. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  90. GRB 220715B: Swift-BAT refined analysis
  91. GRB220714B: UVOT detections
  92. GRB 220715B: Fermi GBM detection
  93. GRB 220715B: Swift-XRT refined Analysis
  94. GRB 220715B: Swift/UVOT Upper Limits
  95. Swift GRB 220715B: Global MASTER-Net observations report
  96. GRB 220714B: Swift-BAT refined analysis
  97. GRB 220714B: Fermi GBM observation
  98. GRB 220715A: AGILE/MCAL detection
  99. GRB 220714B: LCO Optical Observations
  100. GRB 220714B: Swift-XRT refined Analysis

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