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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"

37764 results found.

  1. GRB 181123B: ATCA 5/9 GHz rapid-response radio observation
  2. Short-duration GRB 181121.4: MASTER-Tavrida possible OT detection near the PGC galaxy during large Fermi error box inspection
  3. GRB 181127A : a long GRB detected by INTEGRAL
  4. GRB 181126A: Swift-BAT refined analysis
  5. GRB 181126A: No Ks-band afterglow detection with Keck I
  6. GRB 181123B: Keck further near-infrared imaging
  7. GRB 181126A: Swift/UVOT Upper Limits
  8. GRB 181126A: Swift-XRT refined Analysis
  9. GRB 181126A deep Gemini imaging
  10. GRB 181126A: Fermi GBM observation
  11. Konus-Wind observation of GRB 181121A
  12. GRB 181126A: Enhanced Swift-XRT position
  13. GRB 181126A: Prompt enhanced Swift-XRT position
  14. GRB 181126A: Swift detection of a burst
  15. GRB 181123B: Insight-HXMT/HE detection
  16. GRB 181125A: Fermi GBM observation
  17. GRB 181125A: Swift-BAT refined analysis
  18. IPN Triangulation of GRB 181121A (short)
  19. GRB 181125A: Swift detection of a burst
  20. GRB 181121A: AstroSat CZTI detection
  21. Swift J1858.6-0814/GRB 181123A: Swift/BAT location correction to GCN 23442
  22. Swift trigger 873178: GRB 181123A is Swift J1858.6-0814
  23. GRB 181123B: Global MASTER Net optical inspection
  24. GRB 181123B: Swift-BAT lag analysis and search for extended emission
  25. GRB 181123A, Swift-BAT refined analysis
  26. GRB 181123B: Keck near-infrared imaging
  27. GRB 181123B: Gemini-North optical detection
  28. GRB 181119A: AstroSat CZTI detection
  29. GRB 181123B: Swift/UVOT Upper Limits
  30. GRB 181020A: AstroSat CZTI detection
  31. GRB 181123B: Swift-XRT refined Analysis
  32. GRB 181123B: Enhanced Swift-XRT position
  33. GRB 181123B: Prompt enhanced Swift-XRT position
  34. GRB 181123B: Swift detection of a short burst
  35. GRB 181123A: Swift detection of a burst
  36. GRB 181119A: Insight-HXMT/HE detection
  37. GRB 181121A: AGILE/MCAL detection of a burst
  38. GRB 181120A: Fermi GBM observation
  39. GRB 181120A: Fermi-LAT detection
  40. Swift Trigger 872470: further Swift analysis
  41. Swift Trigger 872470 is probably not a GRB
  42. Konus-Wind observation of GRB 181110A
  43. GRB 181110A: optical observations in Chilescope observatory
  44. GROND observations of GRB181110A
  45. GRB 181110A: VLT/X-shooter redshift
  46. GRB 181110A, Swift-BAT refined analysis
  47. GRB 181110A: Swift/UVOT Detection
  48. GRB 181110A: Swift-XRT refined Analysis
  49. GRB 181110A: Enhanced Swift-XRT position
  50. GRB 181110A: optical observations from iTelescope SSO
  51. GRB 181110A: MITSuME Akeno optical observation
  52. GRB 181110A: Kanata 1.5m optical observation
  53. GRB 181110A: Swift detection of a burst with an optical counterpart
  54. Fermi GRB 181105.31: Global MASTER Net optical observations
  55. GRB 181103A: AbAO optical upper limit
  56. GRB 181028A: Insight-HXMT/HE detection
  57. GRB 181103A: MITSuME Okayama optical upper limits
  58. GRB 181103A: Swift/UVOT Detection
  59. GRB 181103A: Nanshan-1m optical upper limit
  60. GRB 181103A: Swift-BAT refined analysis
  61. GRB 181103A: Swift-XRT refined Analysis
  62. GRB 181103A: Enhanced Swift-XRT position
  63. GRB 181103A: Swift detection of a burst
  64. GRB 181030A: Swift/UVOT Detection
  65. GRB 181028A: CALET Gamma-Ray Burst Monitor detection
  66. GRB 181030A, Swift-BAT refined analysis
  67. GRB 181030A: RATIR Optical and NIR Observations
  68. GRB 181026A: AstroSat CZTI detection
  69. GRB 181030A: Swift-XRT refined Analysis
  70. Konus-Wind observation of GRB 181028A
  71. GRB 181030A: MASTER Net OT detection
  72. GRB 181030A: Enhanced Swift-XRT position
  73. GRB 181030A: SAO RAS optical observations
  74. GRB 181030A: Swift detection of a burst with a possible optical counterpart
  75. IPN Triangulation of GRB 181028A (long)
  76. GRB 181028A: Fermi GBM observation
  77. GRB 181028A: Fermi-LAT detection
  78. GRB 181027A: Fermi GBM detection
  79. GRB 181027A: Swift-BAT refined analysis
  80. GRB 181027A: Swift detection of a burst
  81. GRB 180728B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 554505003)
  82. Fermi-LAT Gamma-ray Observations of IceCube-181023A
  83. GRB 181023A: Swift-BAT refined analysis
  84. GRB 181023A: Swift/UVOT Upper Limits
  85. IceCube-181023A - IceCube observation of a high-energy neutrino candidate event
  86. GRB 181022A: Swift-XRT refined Analysis
  87. GRB 181023A: Swift-XRT refined Analysis
  88. GRB 181022A: MITSuME Akeno optical upper limits
  89. GRB 181022A: GROND upper limits
  90. GRB 181022A: LCO Sutherland observations
  91. GRB 181023A: Enhanced Swift-XRT position
  92. GRB 181023A: KAIT Optical Upper Limit
  93. GRB 181022A: Swift/UVOT Upper Limits
  94. GRB 181023A: Swift detection of a burst
  95. GRB 181022A: Swift-BAT refined analysis
  96. GRB 181022A: Swift detection of a burst
  97. Konus-Wind observation of GRB 181020A
  98. GRB 181020A: REM detection
  99. GRB 181020A: Swift/UVOT Detection
  100. GRB 181020A: Global MASTER Net OT observations

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