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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"

11854 results found.

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

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