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"

24595 results found.

  1. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  2. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220212A
  3. IPN triangulation of GRB 220211A (short)
  4. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  5. GRB 220210A: Fermi GBM detection
  6. Fermi GRB 220211B: Global MASTER-Net observations report
  7. GRB 220211B: Fermi GBM Final Real-time Localization
  8. GRB 220209A: Fermi-LAT detection
  9. GRB 220210A: Fermi-LAT detection
  10. GRB 220210A: AGILE detection
  11. GRB 220210A: Swift/BAT-GUANO localization
  12. Fermi GRB 220211A: Global MASTER-Net observations report
  13. GRB 220211A: Fermi GBM Final Real-time Localization
  14. Fermi GRB 220210A: Global MASTER-Net observations report
  15. GRB 220210A: Fermi GBM Final Real-time Localization
  16. GRB 220209A: Fermi GBM Detection
  17. GRB 220209A: GECAM detection
  18. GRB 220209A: AGILE/MCAL detection
  19. Fermi GRB 220209A: Global MASTER-Net observations report
  20. GRB 220209A: Fermi GBM Final Real-time Localization
  21. IceCube-220205B: Upper limits from a search for additional neutrino events in IceCube
  22. IceCube-220205A: Upper limits from a search for additional neutrino events in IceCube
  23. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  24. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  25. IceCube-220205B: No neutrino counterpart candidates in ANTARES search
  26. Konus-Wind detection of GRB 220130A
  27. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  28. Konus-Wind detection of GRB 220203A
  29. GRB 220203A: GECAM detection
  30. IceCube-220205A - IceCube observation of a high-energy neutrino candidate track-like event
  31. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  32. IPN triangulation of GRB 220203A (short)
  33. IPN triangulation of GRB 220130A
  34. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  35. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  36. IceCube-220202A: Upper limits from a search for additional neutrino events in IceCube
  37. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  38. IceCube-220202A: IceCube observation of a high-energy neutrino candidate track-like event
  39. IceCube Alert 220202.49: Global MASTER-Net observations report
  40. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  41. GRB 220201A: Fermi GBM Final Localization
  42. GRB 220128A: AstroSat CZTI detection
  43. GRB 220130A: Fermi GBM Observation
  44. Konus-Wind detection of GRB 220128A
  45. IPN triangulation of GRB 220128A (long)
  46. Fermi GRB 220131A: Global MASTER-Net observations report
  47. GRB 220131B: GECAM detection
  48. GRB 220130A: GECAM detection
  49. GRB 220131A: Fermi GBM Final Real-time Localization
  50. Fermi GRB 220129A: Global MASTER-Net observations report
  51. GRB 220129A: Fermi GBM Final Real-time Localization
  52. GRB 220127A: GECAM detection
  53. GECAM observations of a series of bursts from SGR J1935+2154
  54. Konus-Wind detection of GRB 220124A
  55. IPN triangulation of GRB 220124A
  56. GRB 220124A: GECAM detection
  57. Fermi trigger No 664738369: Global MASTER-Net observations report
  58. GRB 220121B: GECAM detection
  59. Fermi-LAT-ANTARES 220121a: upper limits from a search for coincident neutrinos with IceCube
  60. Fermi-LAT-ANTARES 220121a Coincidence
  61. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  62. IPN triangulation of a bright burst from SGR 1935+2154
  63. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  64. GRB 220120A: Fermi GBM Final Localization
  65. GRB 220117C: Fermi GBM Observation
  66. GRB 220118A: Fermi GBM detection
  67. GRB 220118A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  68. GRB 220117C: Swift/BAT-GUANO arcminute localization
  69. Swift currently in safe hold with science slews disabled
  70. GRB 220118A: Swift-BAT refined analysis
  71. Swift GRB220118.50: Global MASTER-Net observations report
  72. GRB 220118A: MITSuME Akeno optical observation
  73. GRB 220117B: z-band limit
  74. Swift GRB 220118A: Global MASTER-Net observations report
  75. GRB 220118A: Fermi GBM Final Real-time Localization
  76. GRB 220117A: MITSuME Akeno optical upper limits
  77. Fermi GBM Sub-Threshold Detection of GRB 220117A
  78. GRB 220117B: Swift-BAT refined analysis
  79. GRB 220117A: Swift-BAT refined analysis
  80. IceCube-220115A: Upper limits from a search for additional neutrino events in IceCube
  81. GRB 220117A: LCO Optical Observations
  82. GRB 220117A: VLT/X-shooter optical afterglow and redshift
  83. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  84. GRB 220117B: Swift-XRT refined Analysis
  85. GRB 220117A: Swift-XRT refined Analysis
  86. AMON IC_HAWC NuEm-220116A: No neutrino counterpart detected with ANTARES
  87. GRB 220117B: MITSuME Akeno optical upper limits
  88. Swift GRB 220117A: Global MASTER-Net observations report
  89. Swift GRB 220117B: Global MASTER-Net observations report
  90. GRB 220117B: Swift detection of a burst
  91. GRB 220117A: Swift detection of a burst
  92. GECAM observations of a series of bursts from SGR J1935+2154
  93. Fermi trigger No 663960124: Global MASTER-Net observations report
  94. Fermi trigger No 663967527: Global MASTER-Net observations report
  95. Fermi trigger No 663923149: Global MASTER-Net observations report
  96. Fermi trigger No 663899819: Global MASTER-Net observations report
  97. Fermi trigger No 663886592: Global MASTER-Net observations report
  98. Fermi trigger No 663966693: Global MASTER-Net observations report
  99. GRB 220115B: Fermi GBM Final Real-time Localization
  100. IceCube Alert 220115.51: Global MASTER-Net observations report

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