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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"

12190 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. AX J1846.4-0258: Swift-BAT refined analysis
  21. Konus-Wind detection of GRB 200729A
  22. GRB 200801C: BOOTES-1 and BOOTES-2 optical limits
  23. Fermi GRB 200801A: Global MASTER-Net observations report
  24. Swift Detection of an SGR-like flare from AX J1846.4-0258
  25. Swift GRB200801.84: Global MASTER-Net observations report
  26. GRB 200729A: Swift-XRT refined Analysis
  27. GRB 200729A: IceCube neutrino search
  28. Swift GRB 200729A: Global MASTER-Net observations report
  29. GRB 200729A: Swift detection of a burst
  30. Baksan Neutrino Observatory Alert 200726.66: Global MASTER-Net observations report
  31. Fermi GRB 200723A: Global MASTER-Net observations report
  32. GRB 200716C: CAHA optical observation // Anomalous light curve behavior?
  33. GRB 200716C: CrAO, Terskol, Assy-Turgen optical observations
  34. Konus-Wind observation of GRB 200716C: correction to GCN 28147
  35. Konus-Wind observation of GRB 200716C
  36. Fermi GRB 200718A: Global MASTER-Net observations report
  37. Fermi GBM trigger 616776657/200718619 is not a GRB
  38. GRB 200716C: AGILE/MCAL detection
  39. GRB 200716C: Fermi-LAT detection
  40. GRB 200716C: Swift-XRT refined Analysis
  41. Swift GRB200716.96: Global MASTER-Net observations report
  42. IPN triangulation of GRB 200716A
  43. Fermi GRB 200716B: Global MASTER-Net observations report
  44. GRB 200715A : A long GRB detected by INTEGRAL
  45. GRB 200714E: Fermi GBM observation
  46. Fermi GRB 200714D: Global MASTER-Net observations report
  47. Fermi GRB 200714A: Global MASTER-Net observations report
  48. GRB 200713A: Swift-BAT refined analysis
  49. GRB 200713A: Swift-XRT refined Analysis
  50. GRB 200713A: Swift detection of a burst
  51. GRB 200711A: Swift-BAT refined analysis
  52. GRB 200711A: Fermi-LAT marginal detection
  53. GRB 200711A: KAIT Optical Upper Limit
  54. Fermi-LAT-ANTARES 200407a Coincidence
  55. Fermi GRB 200702A: Global MASTER-Net observations report
  56. Trigger 980513: Swift detection of SGR Swift J1818.0-1607
  57. GRB 200701A: Swift-BAT refined analysis
  58. GRB 200630A: Swift-XRT refined Analysis
  59. GRB 200630A: Swift detection of a burst
  60. Konus-Wind detection of short/hard GRB 200623B
  61. GRB 200625A: Fermi-LAT detection is likely a flare from PKS 1127-14
  62. Updated catalog of X-ray bursts of SGR J1935+2154 from Insight-HXMT observations
  63. GRB 200623A: Swift-XRT observations
  64. IceCube-200620A: No significant detection in HAWC
  65. IceCube-200620A: Upper limits from a search for additional neutrino events in IceCube
  66. IceCube-200620A: INTEGRAL was inactive at the time of the event
  67. IceCube-200620A: MASTER previous detection of ZTF20abgvabi/AT2020ncr
  68. Fermi-LAT Gamma-ray Observations of IceCube-200620A
  69. GRB 200613A: Continued CrAO optical observations
  70. IceCube Alert 200620.13: Global MASTER-Net observations report
  71. GRB 200613A: R-band observations from HCT
  72. IceCube-200620A - IceCube observation of a high-energy neutrino candidate track-like event
  73. Fermi GRB 200619B: Global MASTER-Net observations report
  74. Fermi trigger No 614239407: Global MASTER-Net observations report
  75. Fermi trigger No 614226976: Global MASTER-Net observations report
  76. Baksan Neutrino Observatory Alert 200617.47: Global MASTER-Net observations report
  77. Fermi-LAT Gamma-ray Observations of IceCube-200615A
  78. Fermi-LAT Gamma-ray Observations of IceCube-200614A and detection of a new gamma-ray source, Fermi J0202.8+3132
  79. GRB 200615B: MAXI/GSC detection
  80. IceCube-200615A: IceCube observation of a high-energy neutrino candidate event
  81. Fermi GRB 200615A: Global MASTER-Net observations report
  82. Baksan Neutrino Observatory Alert 200614.34: Global MASTER-Net observations report
  83. Fermi GRB 200614A: Global MASTER-Net observations report
  84. IceCube-200614A - IceCube observation of a high-energy neutrino candidate track-like event
  85. GRB 200613A: Liverpool Telescope observations
  86. GRB 200613A: Fermi-LAT detection
  87. GRB 200612A: Swift-BAT refined analysis
  88. GRB 200612A: Swift-XRT refined Analysis
  89. Konus-Wind observation of ultra-long GRB 200612A
  90. GRB 200612A: Enhanced Swift-XRT position
  91. GRB 200612A: BOOTES-3/YA optical upper limit
  92. GRB 200612A: Swift detection of a burst
  93. GRB 200608A: Swift-BAT refined analysis
  94. Konus-Wind detection of GRB 200605A
  95. GRB 200608A: Swift detection of a burst
  96. Fermi GRB 200607B: Global MASTER-Net observations report
  97. 1RXS J1708−4009: Swift-BAT refined analysis
  98. Fermi GRB 200605A: Global MASTER-Net observations report
  99. GRB 200530A: Fermi-LAT detection
  100. GRB 200604A: AstroSat CZTI detection

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