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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"

19663 results found.

  1. GRB 200803A: AstroSat CZTI detection
  2. GRB 200803A: Fermi GBM detection
  3. GRB 200803A: Swift-XRT afterglow detection
  4. GRB 200803A: Fermi-LAT detection
  5. GRB 200803A: Tiled Swift observations
  6. AX J1846.4-0258: Swift-BAT refined analysis
  7. Konus-Wind detection of GRB 200729A
  8. GRB 200801C: BOOTES-1 and BOOTES-2 optical limits
  9. Swift Detection of an SGR-like flare from AX J1846.4-0258
  10. Swift GRB200801.84: Global MASTER-Net observations report
  11. GRB 200729A: VLA Observations
  12. GRB 200729A: Swift-BAT refined analysis
  13. GRB 200729A: Swift/UVOT Upper Limits
  14. GRB 200729A: Swift-XRT refined Analysis
  15. GRB 200729A: HST imaging
  16. Fermi-GBM Sub-Threshold candidate for GRB 200729A
  17. GRB 200729A: IceCube neutrino search
  18. GRB 200729A: Pan-STARRS pre-explosion source detection
  19. GRB 200729A: Enhanced Swift-XRT position
  20. GRB200729A: BOOTES-1 optical upper limit
  21. Swift GRB 200729A: Global MASTER-Net observations report
  22. GRB 200729A: Swift detection of a burst
  23. GRB 200723A: Swift ToO observations
  24. GRB 200716C: CAHA optical observation // Anomalous light curve behavior?
  25. GRB 200714E: Swift-XRT afterglow detection
  26. Konus-Wind observation of GRB 200716C: correction to GCN 28147
  27. Konus-Wind observation of GRB 200716C
  28. GRB 200716C: Insight-HXMT/HE detection
  29. GRB 200716C: CALET Gamma-Ray Burst Monitor detection
  30. GRB 200716C: Swift-BAT refined analysis
  31. GRB 200716C: Fermi GBM detection
  32. GRB 200716C: AGILE/MCAL detection
  33. GRB 200716C: Swift-XRT refined analysis correction
  34. GRB 200716C: Fermi-LAT detection
  35. GRB 200716C: Swift-XRT refined Analysis
  36. GRB 200716C: Enhanced Swift-XRT position
  37. GRB200716C: BOOTES-1 optical afterglow detection
  38. Swift GRB200716C: Global MASTER-Net OT detection
  39. GRB 200716C: Swift detection of a burst with an optical counterpart
  40. Swift GRB200716.96: Global MASTER-Net observations report
  41. IPN triangulation of GRB 200716A
  42. GRB 200715A: Swift-XRT afterglow detection
  43. GRB 200715A: Swift ToO observations
  44. GRB 200714E: Fermi GBM observation
  45. GRB 200714E: Swift-XRT observations
  46. GRB 200714E: Swift ToO observations
  47. GRB 200714E: Swift/BAT-GUANO detection and arcminute localization
  48. GRB 200713A: Swift-BAT refined analysis
  49. GRB 200711A: Insight-HXMT/HE detection
  50. GRB 200713A: Swift-XRT refined Analysis
  51. GRB 200713A: Enhanced Swift-XRT position
  52. GRB 200713A: Swift detection of a burst
  53. GRB 200711A: CALET Gamma-Ray Burst Monitor detection
  54. GRB 200711A: Swift/UVOT Upper Limits
  55. GRB 200711A: Swift-BAT refined analysis
  56. GRB 200711A: Fermi-LAT marginal detection
  57. GRB 200711A: Swift-XRT refined Analysis
  58. GRB 200711A: Fermi GBM detection
  59. Swift GRB 200711A: Global MASTER-Net observations report
  60. GRB 200711A: Swift detection of a burst
  61. GRB 200709B/HAWC-200907A: Swift-XRT further observations
  62. HAWC-200907A: No Neutrino Counterpart detected with ANTARES
  63. GRB 200709B: Swift-XRT observations
  64. GRB 200709B: Tiled Swift observations
  65. Trigger 980513: Swift detection of SGR Swift J1818.0-1607
  66. GRB 200701A: Swift-BAT refined analysis
  67. Fermi-GBM Sub-Threshold Detection of GRB 200701A
  68. GRB 200701A: Swift detection of a burst
  69. GRB 200630A: Swift-BAT refined analysis
  70. GRB 200630A: Swift/UVOT Upper Limits
  71. GRB 200630A: Swift-XRT refined Analysis
  72. GRB 200623A: Swift XRT further observations
  73. GRB 200630A: Fermi GBM detection
  74. GRB 200630A: Enhanced Swift-XRT position
  75. GRB 200630A: Swift detection of a burst
  76. GRB 200522A: Gemini North spectroscopy of the putative host galaxy
  77. GRB 200625A: Fermi-LAT detection is likely a flare from PKS 1127-14
  78. GRB 200623A: LBT optical observations
  79. GRB 200623A : SMA observations at Swift/XRT Source #3
  80. GRB 200625A: Swift ToO observations
  81. GRB 200623A: Swift/UVOT Upper Limits
  82. IPN triangulation of GRB 200623B (short)
  83. GRB 200623A: Swift-XRT observations
  84. GRB 200623A: OAJ deep multi-color imaging, XRT #2 is pre-detected
  85. GRB 200623A: TNG optical observations
  86. GRB 200623A: AbAO afterglow candidate within XRT #2
  87. GRB 200623A: Fermi GBM observation
  88. GRB 200623A: Correction to GCN 28013
  89. GRB 200623A: Swift ToO observations
  90. GRB 200623A: Swift/BAT-GUANO detection and arcminute localization of a short GRB
  91. Swift/UVOT Observations of IceCube 200615A
  92. Swift-XRT observations of IceCube 200615A
  93. GRB 200613A: Swift/UVOT Detection
  94. GRB 200613A: Liverpool Telescope observations
  95. GRB 200613A: Swift-XRT afterglow detection
  96. GRB 200612A: Fermi GBM detection
  97. GRB 200613A: Swift ToO observations
  98. GRB 200613A: Fermi-LAT detection
  99. GRB 200612A: Swift/UVOT Upper Limits
  100. GRB 200612A: Swift-BAT refined analysis

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