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"

14986 results found.

  1. GRB 201108A: Fermi GBM Final Real-time Localization
  2. Konus-Wind detection of GRB 201105A
  3. Swift XRT and UVOT detection of ZTF20acozryr/AT2020yxz/GRB201103B
  4. GRB 201015A: Swift-XRT late time observations
  5. GRB 201104B: Swift/UVOT Detection
  6. GRB 201103B (ZTF20acozryr/AT2020yxz): VLT/X-shooter redshift
  7. IPN triangulation of GRB 201103B (consistent with ZTF20acozryr/AT2020yxz)
  8. ZTF20acozryr/AT2020yxz: Zwicky Transient Facility discovery of a fast optical transient with no associated GRB
  9. GRB 201104B: VLT/X-shooter redshift
  10. Swift Trigger 1004219: Detection of SGR 1830-0645
  11. GRB 201104C: Fermi GBM Final Real-time Localization
  12. GRB 201103B: AGILE detection
  13. GRB 201104A: AGILE/MCAL detection
  14. GRB 201104A: Fermi-LAT detection
  15. GRB 201104B: Swift/UVOT Detection
  16. GRB 201104B: Swift detection of a burst
  17. GRB 201104A: Fermi GBM Final Real-time Localization
  18. GRB 201103A: Fermi GBM Final Real-time Localization
  19. GRB 201031B: Fermi GBM Final Real-time Localization
  20. GRB 201031A: Swift detection of a burst
  21. GRB 201029A: Fermi GBM detection
  22. GRB 201029A: Swift detection of a burst
  23. GRB 201026A: Fermi GBM detection
  24. GRB 201027A: 1.5m OSN optical upper limit
  25. GRB 201026A: FRAM-ORM optical detection limit
  26. GRB 201027A: Swift detection of a burst
  27. GRB 201026A: Swift detection of a burst
  28. GRB 201024A: Swift/UVOT Detection
  29. GRB 201020B: follow-up observations with Savelli Telescope
  30. GRB 201024A: FRAM-ORM afterglow detection
  31. GRB 201020B: Redshift from GTC/OSIRIS
  32. GRB 201024A: Redshift from GTC/OSIRIS
  33. GRB 201024A: Swift detection of a burst with an optical afterglow
  34. Swift GRB201024A: Global MASTER-Net OT detection
  35. IceCube-201021A: No significant detection in HAWC
  36. IceCube-201021A: Optical counterpart of WISEA J172314.13+142101.5
  37. GRB 201020B: GROWTH-India Telescope optical observations
  38. Fermi-LAT Gamma-ray Observations of IceCube-201021A and detection of a new gamma-ray source, Fermi J1725.5+1312
  39. GRB 201020B: Konkoly Obs. optical detection
  40. GRB 201021C: Fermi GBM detection
  41. GRB 201021C: Swift/UVOT Detection
  42. Konus-Wind detection of GRB 201020A
  43. GRB 201020B: Swift/UVOT Detection
  44. GRB 201020B: Swift-XRT afterglow detection
  45. GRB 201021C: VLT/X-shooter redshift
  46. IceCube-201021A: No neutrino counterpart candidates in ANTARES search
  47. GRB 201021C: Swift detection of a burst with an optical counterpart
  48. HAWC-201019A: No Neutrino Counterpart detected with ANTARES
  49. GRB200826A: GMOS-N detection of a supernova bump
  50. GRB 201021B MAXI/GSC detection
  51. Konus-Wind detection of GRB 201020B
  52. GRB 201020B: MASTER bright optical afterglow detection
  53. GRB 201020B: Fermi-LAT detection
  54. IceCube-201021A: IceCube observation of a high-energy neutrino candidate event
  55. GRB 201020B: AGILE detection
  56. GRB 201021A: Fermi GBM Final Real-time Localization
  57. GRB 201020B: Fermi GBM detection
  58. GRB 201020B: Fermi GBM Final Real-time Localization
  59. GRB 201020A: Swift detection of a burst with an optical counterpart.
  60. GRB 201019B: AstroSat CZTI detection
  61. GRB 201016A: Insight-HXMT/HE detection
  62. GRB 201017A: GROWTH-India optical upper limit
  63. GRB 201015A: 6 GHz VLA radio afterglow candidate detection
  64. GRB 201019A: Fermi GBM Final Real-time Localization
  65. GRB 201014A: MMT afterglow detection
  66. GRB 201019A: Fermi GBM Final Real-time Localization
  67. GRB 201015A: GROWTH-India Telescope (GIT) upper limit
  68. GRB 201015A: HCT optical photometric follow-up
  69. GRB 201017A: Assy and Mondy optical observations, possible afterglow detection
  70. GRB 201017A: Fermi GBM detection
  71. GRB 201015A NUTTelA-TAO / BSTI Early Measurements (Preliminary)
  72. Trigger 1000631: Swift detection of Cen X-3
  73. GRB 201017A: Swift detection of a burst
  74. GRB 201017A: Fermi GBM Final Real-time Localization
  75. GRB 201015A: FRAM-ORM afterglow detection
  76. Fermi GBM Sub-Threshold Detection of GRB 201015A
  77. GRB 201015A: Swift/UVOT Detection
  78. GRB 201015A: redshift confirmation
  79. IceCube-201014A: No significant detection in HAWC
  80. Konus-Wind observation of GRB 201013A
  81. GRB 201016A: AstroSat CZTI detection
  82. GRB 201008A: Swift-XRT afterglow detection
  83. GRB 201016A: Fermi GBM detection
  84. GRB 201015A: BOOTES-1 early optical afterglow detection
  85. GRB 201016B: Fermi GBM Final Real-time Localization
  86. GRB 201015A: GOTO confirmation of afterglow detection
  87. GRB 201016A: Fermi GBM Final Real-time Localization
  88. Swift GRB201015.95: Global MASTER-Net OT detection
  89. GRB 201015A: Swift detection of a burst
  90. GRB 201014A (Swift trigger =1000255): CrAO/ZTSH optical afterglow discovery
  91. Swift-BAT trigger 1000255: XRT afterglow detection of GRB 201014A
  92. GRB 201013A: Insight-HXMT/HE detection
  93. IceCube-201014A: No neutrino counterpart candidates in ANTARES search
  94. Swift Trigger 1000255 is probably not a GRB
  95. GRB 201013A: TSHAO and AbAO optical observations, afterglow confirmation
  96. GRB 201013A: AstroSat CZTI detection
  97. GRB 201013A: CALET Gamma-Ray Burst Monitor detection
  98. IceCube-201014A - IceCube observation of a high-energy neutrino candidate track-like event
  99. GRB 201013A: FRAM-ORM possible afterglow candidate
  100. GRB 201013A: Swift detection of a burst

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