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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"

5863 results found.

  1. GRB 220831A: DECam optical counterpart follow-up
  2. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  3. GRB 220831A: Gemini-South Infrared Observations
  4. GRB 220910A: AstroSat CZTI detection
  5. GRB 220910A: AGILE detection
  6. IceCube-220907A: Upper limits from a search for additional neutrino events in IceCube
  7. IceCube-220907A: One Candidate Counterpart from the Zwicky Transient Facility
  8. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  9. IPN triangulation of GRB 220903A (long)
  10. GRB 220907A: Nanshan/NEXT optical upper limits
  11. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  12. Swift GRB220907.59: Global MASTER-Net observations report
  13. IceCube-220907A - IceCube observation of a high-energy neutrino candidate track-like event
  14. IceCube Alert 220907.28: Global MASTER-Net observations report
  15. Fermi GRB 220905A: Global MASTER-Net observations report
  16. GRB 220831A: DECam detection of a possible optical counterpart
  17. Fermi GRB 220902A: Global MASTER-Net observations report
  18. Fermi trigger No 683654200: Global MASTER-Net observations report
  19. Fermi trigger No 683537972: Global MASTER-Net observations report
  20. Fermi trigger No 683202084: Global MASTER-Net observations report
  21. Fermi trigger No 683183601: Global MASTER-Net observations report
  22. GRB 220826A: Lesedi optical afterglow detection
  23. GRB 220826A: iTelescope optical afterglow observations
  24. Fermi trigger No 682918137: Global MASTER-Net observations report
  25. GRB 220719B: Detection by VZLUSAT-2
  26. Fermi GRB 220810A: Global MASTER-Net observations report
  27. Fermi trigger No 681719116: Global MASTER-Net observations report
  28. Fermi trigger No 681633544: Global MASTER-Net observations report
  29. IceCube Alert 220808.33: Global MASTER-Net observations report
  30. GRB 220806A: Swift detection of a burst
  31. Swift GRB220806.76: Global MASTER-Net observations report
  32. Fermi trigger No 681271717: Global MASTER-Net observations report
  33. GRB 220803A: AstroSat CZTI detection
  34. Fermi trigger No 681212354: Global MASTER-Net observations report
  35. Fermi trigger No 680782656: Global MASTER-Net observations report
  36. Fermi GRB 220728A: Global MASTER-Net observations report
  37. GRB 220726A: Fermi GBM Final Real-time Localization
  38. GRB 220714B: Swift detection of a burst
  39. GRB 220714A: Possible Swift detection of a burst
  40. Fermi trigger No 679248723: Global MASTER-Net observations report
  41. Fermi GRB 220711B: Global MASTER-Net observations report
  42. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  43. GRB 220706A, GROND observations
  44. GRB 220706A: Nanshan/NEXT optical upper limits
  45. MAXI GRB220706.73: Global MASTER-Net observations report
  46. Swift GRB 220706A: Global MASTER-Net observations report
  47. GRB 220706A: Swift detection of a burst
  48. GRB 220701A: MITSuME Akeno optical upper limits
  49. GRB 200701A: KAIT Optical Upper Limit
  50. GRB 220623A: iTelescope optical upper limit
  51. Fermi trigger No 677597318: Global MASTER-Net observations report
  52. GRB 220618A: Fermi GBM detection
  53. GRB 220618A: iTelescope T-19 upper limit
  54. GRB 220617A: TNG optical observations
  55. Fermi trigger No 677307509: Global MASTER-Net observations report
  56. IPN triangulation of GRB 220617A (short)
  57. GRB 220618A: BOOTES-5/JGT early optical upper limit
  58. GRB 220618A: Swift detection of a burst
  59. Swift GRB220618.38: Global MASTER-Net observations report
  60. Fermi trigger No 676909037: Global MASTER-Net observations report
  61. Swift GRB 220611A: Global MASTER-Net observations report
  62. Fermi GRB 220610A: Global MASTER-Net observations report
  63. GRB 220609B: AstroSat CZTI detection
  64. Fermi trigger No 676366592: Global MASTER-Net observations report
  65. Fermi GRB 220608A: Global MASTER-Net observations report
  66. MAXI GRB220607.31: Global MASTER-Net observations report
  67. MAXI GRB220607.41: Global MASTER-Net observations report
  68. Fermi trigger No 675992935: Global MASTER-Net observations report
  69. Konus-Wind observation of GRB 220527A
  70. GRB 220530A: Fermi GBM Final Real-time Localization
  71. GRB 220527A: AstroSat CZTI detection
  72. GRB 220527A: CALET Gamma-Ray Burst Monitor detection
  73. GRB 220527A: Fermi GBM Observation
  74. GRB 220527A: Fermi-LAT detection
  75. GRB 220527A: Fermi GBM Final Localization
  76. GRB 220527A: AGILE detection
  77. Konus-Wind detection of GRB 220524A
  78. IPN triangulation of GRB 220524A
  79. Fermi GRB 220523B: Global MASTER-Net observations report
  80. Fermi GRB 220522A: Global MASTER-Net observations report
  81. Fermi trigger No 674868783: Global MASTER-Net observations report
  82. Swift GRB220519.84: Global MASTER-Net observations report
  83. GRB 220511A: Swift-XRT afterglow detection
  84. GRB 220514B: MAXI/GSC detection
  85. GRB 220514A: MeerLICHT optical afterglow candidate
  86. Fermi GRB 220513A: Global MASTER-Net observations report
  87. IceCube-220509A: No significant detection in HAWC
  88. GRB 220511A: Swift-XRT observations
  89. IceCube-220509A: Upper limits from a search for additional neutrino events in IceCube
  90. GRB 220507A: AstroSat CZTI detection
  91. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  92. Fermi trigger No 673846271: Global MASTER-Net observations report
  93. GRB 220506A: MITSuME Akeno optical upper limits
  94. IceCube-220509A - IceCube observation of a high-energy neutrino candidate track-like event
  95. IceCube Alert 220509.76: Global MASTER-Net observations report
  96. GRB 220507A: Fermi GBM Final Localization
  97. IceCube-220501A: No Candidate Counterparts from the Zwicky Transient Facility
  98. GRB 220427A: Swift detection of a burst with an optical counterpart
  99. Fermi GRB 220426A: Global MASTER-Net observations report
  100. Fermi trigger No 672492774: Global MASTER-Net observations report

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