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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"

19662 results found.

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

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