Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

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"

37766 results found.

  1. GRB 181201A: a long GRB detected by INTEGRAL
  2. GRB 181119A: CALET Gamma-Ray Burst Monitor detection
  3. GRB 181123B: ATCA 5/9 GHz rapid-response radio observation
  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 181123B: Keck further near-infrared imaging
  9. GRB 181126A: Swift/UVOT Upper Limits
  10. GRB 181126A: Swift-XRT refined Analysis
  11. GRB 181126A deep Gemini imaging
  12. GRB 181126A: Fermi GBM observation
  13. Konus-Wind observation of GRB 181121A
  14. GRB 181126A: Enhanced Swift-XRT position
  15. GRB 181126A: Prompt enhanced Swift-XRT position
  16. GRB 181126A: Swift detection of a burst
  17. GRB 181123B: Insight-HXMT/HE detection
  18. GRB 181125A: Fermi GBM observation
  19. GRB 181125A: Swift-BAT refined analysis
  20. IPN Triangulation of GRB 181121A (short)
  21. GRB 181125A: Swift detection of a burst
  22. GRB 181121A: AstroSat CZTI detection
  23. Swift J1858.6-0814/GRB 181123A: Swift/BAT location correction to GCN 23442
  24. Swift trigger 873178: GRB 181123A is Swift J1858.6-0814
  25. GRB 181123B: Global MASTER Net optical inspection
  26. GRB 181123B: Swift-BAT lag analysis and search for extended emission
  27. GRB 181123A, Swift-BAT refined analysis
  28. GRB 181123B: Keck near-infrared imaging
  29. GRB 181123B: Gemini-North optical detection
  30. GRB 181119A: AstroSat CZTI detection
  31. GRB 181123B: Swift/UVOT Upper Limits
  32. GRB 181020A: AstroSat CZTI detection
  33. GRB 181123B: Swift-XRT refined Analysis
  34. GRB 181123B: Enhanced Swift-XRT position
  35. GRB 181123B: Prompt enhanced Swift-XRT position
  36. GRB 181123B: Swift detection of a short burst
  37. GRB 181123A: Swift detection of a burst
  38. GRB 181119A: Insight-HXMT/HE detection
  39. GRB 181121A: AGILE/MCAL detection of a burst
  40. GRB 181120A: Fermi GBM observation
  41. GRB 181120A: Fermi-LAT detection
  42. Swift Trigger 872470: further Swift analysis
  43. Swift Trigger 872470 is probably not a GRB
  44. Konus-Wind observation of GRB 181110A
  45. GRB 181110A: optical observations in Chilescope observatory
  46. GROND observations of GRB181110A
  47. GRB 181110A: VLT/X-shooter redshift
  48. GRB 181110A, Swift-BAT refined analysis
  49. GRB 181110A: Swift/UVOT Detection
  50. GRB 181110A: Swift-XRT refined Analysis
  51. GRB 181110A: Enhanced Swift-XRT position
  52. GRB 181110A: optical observations from iTelescope SSO
  53. GRB 181110A: MITSuME Akeno optical observation
  54. GRB 181110A: Kanata 1.5m optical observation
  55. GRB 181110A: Swift detection of a burst with an optical counterpart
  56. Fermi GRB 181105.31: Global MASTER Net optical observations
  57. GRB 181103A: AbAO optical upper limit
  58. GRB 181028A: Insight-HXMT/HE detection
  59. GRB 181103A: MITSuME Okayama optical upper limits
  60. GRB 181103A: Swift/UVOT Detection
  61. GRB 181103A: Nanshan-1m optical upper limit
  62. GRB 181103A: Swift-BAT refined analysis
  63. GRB 181103A: Swift-XRT refined Analysis
  64. GRB 181103A: Enhanced Swift-XRT position
  65. GRB 181103A: Swift detection of a burst
  66. GRB 181030A: Swift/UVOT Detection
  67. GRB 181028A: CALET Gamma-Ray Burst Monitor detection
  68. GRB 181030A, Swift-BAT refined analysis
  69. GRB 181030A: RATIR Optical and NIR Observations
  70. GRB 181026A: AstroSat CZTI detection
  71. GRB 181030A: Swift-XRT refined Analysis
  72. Konus-Wind observation of GRB 181028A
  73. GRB 181030A: MASTER Net OT detection
  74. GRB 181030A: Enhanced Swift-XRT position
  75. GRB 181030A: SAO RAS optical observations
  76. GRB 181030A: Swift detection of a burst with a possible optical counterpart
  77. IPN Triangulation of GRB 181028A (long)
  78. GRB 181028A: Fermi GBM observation
  79. GRB 181028A: Fermi-LAT detection
  80. GRB 181027A: Fermi GBM detection
  81. GRB 181027A: Swift-BAT refined analysis
  82. GRB 181027A: Swift detection of a burst
  83. GRB 180728B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 554505003)
  84. Fermi-LAT Gamma-ray Observations of IceCube-181023A
  85. GRB 181023A: Swift-BAT refined analysis
  86. GRB 181023A: Swift/UVOT Upper Limits
  87. IceCube-181023A - IceCube observation of a high-energy neutrino candidate event
  88. GRB 181022A: Swift-XRT refined Analysis
  89. GRB 181023A: Swift-XRT refined Analysis
  90. GRB 181022A: MITSuME Akeno optical upper limits
  91. GRB 181022A: GROND upper limits
  92. GRB 181022A: LCO Sutherland observations
  93. GRB 181023A: Enhanced Swift-XRT position
  94. GRB 181023A: KAIT Optical Upper Limit
  95. GRB 181022A: Swift/UVOT Upper Limits
  96. GRB 181023A: Swift detection of a burst
  97. GRB 181022A: Swift-BAT refined analysis
  98. GRB 181022A: Swift detection of a burst
  99. Konus-Wind observation of GRB 181020A
  100. GRB 181020A: REM detection

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov