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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

12108 results found.

  1. GRB 220930A: Enhanced Swift-XRT position
  2. GRB 220930A: Prompt enhanced Swift-XRT position
  3. GRB 220930A: Swift detection of a burst
  4. Fermi-LAT gamma-ray observations of IceCube-220928A
  5. Konus-Wind detection of GRB 220927A
  6. IPN triangulation of GRB 220927A (long)
  7. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  8. Analysis of long GRB 220926B detected by INTEGRAL
  9. GRB 220926B
  10. Fermi GRB 220925A: Global MASTER-Net observations report
  11. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  12. Fermi trigger No 685748699: Global MASTER-Net observations report
  13. Konus-Wind detection of GRB 220921A
  14. GRB 220921A: Fermi-LAT detection
  15. Fermi trigger No 685452089: Global MASTER-Net observations report
  16. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  17. IceCube-220907A: No significant detection in HAWC
  18. Konus-Wind detection of GRB 220910A
  19. Fermi GRB 220912A: Global MASTER-Net observations report
  20. GRB 220912A: AstroSat CZTI detection
  21. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  22. GRB 220910A: AstroSat CZTI detection
  23. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  24. GRB 220907A: Swift-XRT position
  25. GRB 220907A: Swift detection of a burst
  26. Fermi GRB 220905A: Global MASTER-Net observations report
  27. Fermi GRB 220902A: Global MASTER-Net observations report
  28. GRB 220831A, VLT/HAWK-I near-infrared observations
  29. Fermi trigger No 683654200: Global MASTER-Net observations report
  30. IceCube-220822A: No significant detection in HAWC
  31. Fermi trigger No 683537972: Global MASTER-Net observations report
  32. Fermi trigger No 683476673: Global MASTER-Net observations report
  33. Konus-Wind detection of GRB 220826A
  34. Fermi trigger No 683202084: Global MASTER-Net observations report
  35. Fermi trigger No 683183601: Global MASTER-Net observations report
  36. GRB 220826A: Swift-XRT refined Analysis
  37. GRB 220826A: Swift detection of a burst with an optical counterpart
  38. GRB 220825A: Swift/BAT-GUANO detection
  39. IceCube-220822A: Upper limits from a search for additional neutrino events in IceCube
  40. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  41. Fermi trigger No 682918137: Global MASTER-Net observations report
  42. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  43. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  44. IceCube Alert 220822.85: Global MASTER-Net observations report
  45. Konus-Wind detection of GRB 220813A
  46. GRB 220813A: Swift-XRT refined Analysis
  47. GRB 220813A: Swift detection of a burst with an optical counterpart
  48. Fermi trigger No 681998863: Global MASTER-Net observations report
  49. GRB 220810A: MeerLICHT detection of two afterglow candidates
  50. Fermi trigger No 681890304: Global MASTER-Net observations report
  51. Swift GRB220806.76: Global MASTER-Net observations report
  52. GRB 220803A: AstroSat CZTI detection
  53. Konus-Wind detection of GRB 220730A (short)
  54. GRB 220729A: AstroSat CZTI detection
  55. Fermi trigger No 680782656: Global MASTER-Net observations report
  56. Fermi GRB 220728A: Global MASTER-Net observations report
  57. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220728A
  58. GRB 220728A: Fermi GBM Final Real-time Localization
  59. Fermi GRB 220724A: Global MASTER-Net observations report
  60. Introducing new GCN Kafka broker and web site for transient alerts, https://gcn.nasa.gov
  61. GRB 220715B: Swift-BAT refined analysis
  62. GRB 220714B: Swift-XRT refined Analysis
  63. GRB 220714B: Swift detection of a burst
  64. GRB 220714A: Possible Swift detection of a burst
  65. GRB 220710A: Swift-XRT afterglow detection
  66. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  67. GRB 220711B, GROND observations
  68. Konus-Wind detection of GRB 220711C
  69. Fermi trigger No 679248723: Global MASTER-Net observations report
  70. Fermi GRB 220711B: Global MASTER-Net observations report
  71. GRB 220710A: Swift/BAT-GUANO arcminute localization
  72. GRB 220711B: Swift-XRT refined Analysis
  73. GRB 220711B: Swift detection of a burst
  74. GRB 220707A: AstroSat CZTI detection
  75. GRB 220708B: GIT optical upper limits
  76. GRB 220708B: T193-OHP optical upper limit
  77. Konus-Wind detection of GRB 220708B
  78. GRB 220708B: Swift-XRT afterglow detection
  79. GRB 220708B: Swift/BAT-GUANO arcminute localization
  80. GRB 220708A: Swift-XRT observations
  81. GRB 220706A: Swift-XRT refined Analysis
  82. GRB 220706A, GROND observations
  83. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  84. GRB 220702B: AstroSat CZTI detection
  85. GRB 220706A: Nanshan/NEXT optical upper limits
  86. GRB 220706A: Swift detection of a burst
  87. GRB 220702B: Fermi GBM Final Localization
  88. Alert from the HAWC Burst Monitor HAWC-220702A
  89. GRB 220627A: AstroSat CZTI detection
  90. GRB 220701A: Swift-XRT refined Analysis
  91. GRB 220701A: BOOTES-5/JGT early optical upper limit
  92. GRB 200701A: KAIT Optical Upper Limit
  93. GRB 220701A: Swift detection of a burst
  94. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  95. GRB 220627A, GROND observations
  96. GRB 220624A: AGILE/GRID refined analysis
  97. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  98. Konus-Wind detection of GRB 220627A
  99. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  100. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB

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