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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"

24595 results found.

  1. GRB 181201A: likely Swift/XRT afterglow
  2. GRB 181201A MASTER-Net OT detection
  3. GRB 181201A: a long GRB detected by INTEGRAL
  4. Short-duration GRB 181121.4: MASTER-Tavrida possible OT detection near the PGC galaxy during large Fermi error box inspection
  5. GRB 181127A : a long GRB detected by INTEGRAL
  6. GRB 181126A: Swift-BAT refined analysis
  7. GRB 181126A: No Ks-band afterglow detection with Keck I
  8. GRB 181126A: Fermi GBM observation
  9. Konus-Wind observation of GRB 181121A
  10. GRB 181126A: Swift detection of a burst
  11. GRB 181125A: Fermi GBM observation
  12. GRB 181125A: Swift-BAT refined analysis
  13. IPN Triangulation of GRB 181121A (short)
  14. GRB 181125A: Swift detection of a burst
  15. GRB 181123B: Global MASTER Net optical inspection
  16. GRB 181123A, Swift-BAT refined analysis
  17. GRB 181123B: Gemini-North optical detection
  18. GRB 181123B: Swift detection of a short burst
  19. GRB 181120A: Fermi GBM observation
  20. GRB 181120A: Fermi-LAT detection
  21. Swift Trigger 872470: further Swift analysis
  22. Swift Trigger 872470 is probably not a GRB
  23. GRB 181110A: VLT/X-shooter redshift
  24. GRB 181110A, Swift-BAT refined analysis
  25. GRB 181110A: Swift-XRT refined Analysis
  26. GRB 181110A: optical observations from iTelescope SSO
  27. GRB 181110A: MITSuME Akeno optical observation
  28. GRB 181110A: Swift detection of a burst with an optical counterpart
  29. Fermi GRB 181105.31: Global MASTER Net optical observations
  30. GRB 181103A: MITSuME Okayama optical upper limits
  31. GRB 181103A: Nanshan-1m optical upper limit
  32. GRB 181103A: Swift-BAT refined analysis
  33. IceCube-181031A retraction
  34. GRB 181030A, Swift-BAT refined analysis
  35. Konus-Wind observation of GRB 181028A
  36. GRB 181030A: MASTER Net OT detection
  37. IPN Triangulation of GRB 181028A (long)
  38. GRB 181028A: Fermi GBM observation
  39. GRB 181028A: Fermi-LAT detection
  40. GRB 181027A: Fermi GBM detection
  41. GRB 181027A: Swift-BAT refined analysis
  42. GRB 181027A: Swift detection of a burst
  43. IceCube-181023A: MASTER Net optical alert and follow up observations
  44. Search for counterparts to IceCube-181023A with IceCube
  45. GRB 180728B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 554505003)
  46. Fermi-LAT Gamma-ray Observations of IceCube-181023A
  47. GRB 181023A: Swift-BAT refined analysis
  48. IceCube-181023A - IceCube observation of a high-energy neutrino candidate event
  49. GRB 181023A: Swift-XRT refined Analysis
  50. GRB 181022A: MITSuME Akeno optical upper limits
  51. GRB 181022A: GROND upper limits
  52. GRB 181022A: LCO Sutherland observations
  53. GRB 181023A: KAIT Optical Upper Limit
  54. GRB 181022A: Swift-BAT refined analysis
  55. Konus-Wind observation of GRB 181020A
  56. GRB 181020A: REM detection
  57. Baksan Neutrino BNO 181021: Global MASTER-net Optical Follow-up Observations
  58. GRB 181020A: Global MASTER Net OT observations
  59. GRB 181020A: LCO Cerro Tololo observations
  60. GRB 181020A: Swift-BAT refined analysis
  61. GRB 181020A: VLT/X-shooter spectroscopy and redshift
  62. GRB 181020A: Swift-XRT refined Analysis
  63. GRB 181020A: Fermi GBM detection
  64. GRB 181020A: Fermi-LAT detection
  65. FRB 181016: MASTER optical inspection of the Fast Radio Burst error box
  66. Fermi GBM Observation of IceCube-181014A
  67. GRB 181016A: Swift-BAT refined analysis
  68. GRB 181016A: Swift detection of a burst
  69. Search for counterparts to IceCube-181014A with IceCube
  70. Fermi-LAT Gamma-ray Observations of IceCube-181014A
  71. IceCube-181014A - IceCube observation of a high-energy neutrino candidate event
  72. GRB 181013A: Swift-BAT refined analysis
  73. GRB 181013A: Global MASTER Net optical observations
  74. Swift Trigger 866757: is probably not a GRB
  75. GRB 181011A: Global MASTER Net optical inspection
  76. GRB 181011A: CALET Gamma-Ray Burst Monitor detection
  77. IPN Triangulation of GRB 181011A (long)
  78. GRB180913A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 558557292)
  79. GRB 181010A: REM optical and NIR afterglow detection
  80. GRB 181008B: Global MASTER Net optical inspection
  81. GRB 181010A: Swift-BAT refined analysis
  82. GRB 181010A: Fermi GBM observation
  83. IPN Triangulation of GRB 181008B (long)
  84. GRB 181010A: VLT/X-shooter redshift
  85. GRB 181010A: LCO Cerro Tololo observations
  86. GRB 181010A: MASTER-Argentina OT detection
  87. GRB 181003A: Swift-BAT refined analysis
  88. GRB 181003A: LCO Cerro Tololo observations
  89. GRB 181003A: MASTER optical observation
  90. GRB 181003A: Swift-XRT observations
  91. GRB 181003A: Swift detection of a burst
  92. GRB 181002A: Swift-BAT refined analysis
  93. GRB 181002A: MASTER optical observation
  94. Konus-Wind observation of GRB 180925A
  95. GRB 180930A: Swift-BAT refined analysis
  96. GRB 180930A: KAIT Optical Upper Limit
  97. INTEGRAL detections of the prompt gamma-ray emission of GRB 180914B
  98. GRB 180925A: VLT optical observations
  99. GRB 180925A: Swift-BAT refined analysis
  100. Konus-Wind observation of GRB 180923A

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