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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"

11855 results found.

  1. Konus-Wind observation of GRB 200815A
  2. Baksan Neutrino Observatory Alert 200819.88: Global MASTER-Net observations report
  3. GRB 200819A / Swift J0125.7+6303: Ondrejov Perek-2m optical limit
  4. Fermi trigger No 619487843: Global MASTER-Net observations report
  5. GRB 200817A: Fermi GBM Final Real-time Localization
  6. Fermi trigger No 619270776: Global MASTER-Net observations report
  7. HAWC alert 200815.26: MASTER optical observations
  8. Fermi GRB 200809B: Global MASTER-Net observations report
  9. GRB 200809B: MAXI/GSC detection
  10. Fermi trigger No 618642276: Global MASTER-Net observations report
  11. GRB 200806A: CAHA optical afterglow confirmation
  12. Fermi-LAT Gamma-ray Observations of IceCube-200806A
  13. Swift GRB 200806A: Global MASTER-Net observations report
  14. IceCube-200806A: IceCube observation of a high-energy neutrino candidate event
  15. Fermi GRB 200803B: Global MASTER-Net observations report
  16. GRB 200803A: Fermi-LAT detection
  17. LAT GRB200803.15: Global MASTER-Net observations report
  18. Fermi GRB 200803A: Global MASTER-Net observations report
  19. Fermi GRB 200802A: Global MASTER-Net observations report
  20. Konus-Wind detection of GRB 200729A
  21. GRB 200801C: BOOTES-1 and BOOTES-2 optical limits
  22. Fermi GRB 200801A: Global MASTER-Net observations report
  23. Swift Detection of an SGR-like flare from AX J1846.4-0258
  24. Swift GRB200801.84: Global MASTER-Net observations report
  25. GRB 200729A: Swift-XRT refined Analysis
  26. GRB 200729A: IceCube neutrino search
  27. Swift GRB 200729A: Global MASTER-Net observations report
  28. GRB 200729A: Swift detection of a burst
  29. Baksan Neutrino Observatory Alert 200726.66: Global MASTER-Net observations report
  30. Fermi GRB 200723A: Global MASTER-Net observations report
  31. GRB 200716C: CAHA optical observation // Anomalous light curve behavior?
  32. GRB 200716C: CrAO, Terskol, Assy-Turgen optical observations
  33. Konus-Wind observation of GRB 200716C: correction to GCN 28147
  34. Konus-Wind observation of GRB 200716C
  35. Fermi GRB 200718A: Global MASTER-Net observations report
  36. Fermi GBM trigger 616776657/200718619 is not a GRB
  37. GRB 200716C: AGILE/MCAL detection
  38. GRB 200716C: Fermi-LAT detection
  39. GRB 200716C: Swift-XRT refined Analysis
  40. Swift GRB200716.96: Global MASTER-Net observations report
  41. IPN triangulation of GRB 200716A
  42. Fermi GRB 200716B: Global MASTER-Net observations report
  43. GRB 200715A : A long GRB detected by INTEGRAL
  44. GRB 200714E: Fermi GBM observation
  45. Fermi GRB 200714D: Global MASTER-Net observations report
  46. Fermi GRB 200714A: Global MASTER-Net observations report
  47. GRB 200713A: Swift-BAT refined analysis
  48. GRB 200713A: Swift-XRT refined Analysis
  49. GRB 200713A: Swift detection of a burst
  50. GRB 200711A: Swift-BAT refined analysis
  51. GRB 200711A: Fermi-LAT marginal detection
  52. GRB 200711A: KAIT Optical Upper Limit
  53. Fermi-LAT-ANTARES 200407a Coincidence
  54. Fermi GRB 200702A: Global MASTER-Net observations report
  55. GRB 200701A: Swift-BAT refined analysis
  56. GRB 200630A: Swift-XRT refined Analysis
  57. GRB 200630A: Swift detection of a burst
  58. Konus-Wind detection of short/hard GRB 200623B
  59. GRB 200625A: Fermi-LAT detection is likely a flare from PKS 1127-14
  60. GRB 200623A: Swift-XRT observations
  61. IceCube-200620A: No significant detection in HAWC
  62. IceCube-200620A: Upper limits from a search for additional neutrino events in IceCube
  63. IceCube-200620A: INTEGRAL was inactive at the time of the event
  64. IceCube-200620A: MASTER previous detection of ZTF20abgvabi/AT2020ncr
  65. Fermi-LAT Gamma-ray Observations of IceCube-200620A
  66. GRB 200613A: Continued CrAO optical observations
  67. IceCube Alert 200620.13: Global MASTER-Net observations report
  68. GRB 200613A: R-band observations from HCT
  69. IceCube-200620A - IceCube observation of a high-energy neutrino candidate track-like event
  70. Fermi GRB 200619B: Global MASTER-Net observations report
  71. Fermi trigger No 614239407: Global MASTER-Net observations report
  72. Fermi trigger No 614226976: Global MASTER-Net observations report
  73. Baksan Neutrino Observatory Alert 200617.47: Global MASTER-Net observations report
  74. Fermi-LAT Gamma-ray Observations of IceCube-200615A
  75. Fermi-LAT Gamma-ray Observations of IceCube-200614A and detection of a new gamma-ray source, Fermi J0202.8+3132
  76. GRB 200615B: MAXI/GSC detection
  77. IceCube-200615A: IceCube observation of a high-energy neutrino candidate event
  78. Fermi GRB 200615A: Global MASTER-Net observations report
  79. Baksan Neutrino Observatory Alert 200614.34: Global MASTER-Net observations report
  80. Fermi GRB 200614A: Global MASTER-Net observations report
  81. IceCube-200614A - IceCube observation of a high-energy neutrino candidate track-like event
  82. GRB 200613A: Liverpool Telescope observations
  83. GRB 200613A: Fermi-LAT detection
  84. GRB 200612A: Swift-BAT refined analysis
  85. GRB 200612A: Swift-XRT refined Analysis
  86. Konus-Wind observation of ultra-long GRB 200612A
  87. GRB 200612A: Enhanced Swift-XRT position
  88. GRB 200612A: BOOTES-3/YA optical upper limit
  89. GRB 200612A: Swift detection of a burst
  90. GRB 200608A: Swift-BAT refined analysis
  91. Konus-Wind detection of GRB 200605A
  92. GRB 200608A: Swift detection of a burst
  93. Fermi GRB 200607B: Global MASTER-Net observations report
  94. Fermi GRB 200605A: Global MASTER-Net observations report
  95. GRB 200530A: Fermi-LAT detection
  96. GRB 200604A: AstroSat CZTI detection
  97. Fermi trigger No 612988790: Global MASTER-Net observations report
  98. Fermi GRB 200604A: Global MASTER-Net observations report
  99. GRB 200604A: Fermi GBM Final Real-time Localization
  100. Konus-Wind observation of GRB200528A

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