Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

12126 results found.

  1. GRB 211207A: Swift detection of a burst with an optical counterpart
  2. GRB 211206A: AstroSat CZTI detection
  3. GRB 211206B: AstroSat CZTI detection
  4. GRB 211204C: AstroSat CZTI detection
  5. GRB 211206A: Swift/BAT-GUANO detection outside the coded FOV
  6. GRB 211206A: AGILE/MCAL detection of a burst
  7. GRB 211204C: Swift/BAT-GUANO detection outside the coded FOV
  8. Konus-Wind detection of GRB 211130A
  9. GRB 211201A: Swift/BAT-GUANO detection likely outside the coded FOV
  10. GRB 211201A: Fermi GBM Final Real-time Localization
  11. GRB 211106A: GECAM detection
  12. GRB 211129A: Swift-XRT refined Analysis
  13. Swift GRB 211129A: Global MASTER-Net observations report
  14. Fermi-LAT Gamma-ray Observations of IceCube-211125A
  15. GRB 211120548: Fermi GBM observation
  16. Konus-Wind detection of GRB 211120A
  17. IPN triangulation of GRB 211120A
  18. Chandra observations of GRB 210905A
  19. Fermi-LAT Gamma-ray Observations of IceCube-211123A
  20. IceCube-211123A: Upper limits from Fermi-GBM Observations
  21. GRB 211124A: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  22. Fermi trigger No 659413798: Global MASTER-Net observations report
  23. GRB 211120A: AGILE detection
  24. GRB 211120A: AstroSat CZTI detection
  25. GRB 211120B: Swift/BAT-GUANO detection outside the coded FOV
  26. GRB 211118A: AstroSat CZTI detection
  27. GRB 211023A: optical observations and photometric evidence of supernova
  28. Fermi-LAT Gamma-ray Observations of IceCube-211117A
  29. GRB211118A: Swift/BAT-GUANO detection outside the coded FOV
  30. Fermi trigger No 658971499: Global MASTER-Net observations report
  31. Fermi-LAT Gamma-ray Observations of IceCube-211116A
  32. Fermi trigger No 658755664: Global MASTER-Net observations report
  33. Konus-Wind detection of GRB 211107B
  34. GRB 211115A: MAXI/GSC detection
  35. GRB 211023A: classification and SPI-ACS/INTEGRAL registration
  36. Fermi GRB 211112A: Global MASTER-Net observations report
  37. GRB 211110A: AstroSat CZTI detection
  38. Fermi trigger No 658214822: Global MASTER-Net observations report
  39. GRB 211107B: Swift-XRT afterglow detection
  40. GRB 211107A: GECAM detection
  41. GRB 211106A: VLT/FORS2 optical observations
  42. Fermi GRB 211109B: Global MASTER-Net observations report
  43. Fermi GRB 211109A: Global MASTER-Net observations report
  44. Konus-Wind detection of GRB 211106A
  45. GRB 211023A: BTA spectroscopic redshift
  46. GRB 211107A: Fermi GBM Final Real-time Localization
  47. GRB 211106A: Swift/BAT-GUANO candidate arcminute localization of a short burst
  48. GRB 211105A: MASTER optical inspection
  49. GRB 211105A: Swift/BAT-GUANO detection outside the coded FOV
  50. GRB 211105A: AGILE detection of a burst
  51. Fermi trigger No 657742914: Global MASTER-Net observations report
  52. GRB 211102B: GECAM detection
  53. Konus-Wind detection of GRB 211023A
  54. Fermi GRB 211027A: Global MASTER-Net observations report
  55. GRB 211025A: Swift-XRT refined Analysis
  56. GRB 211024B: Swift-XRT refined Analysis
  57. GRB 210610B: Sintesz-Newton/CrAO optical observations
  58. GRB 211025A: Swift detection of a burst
  59. GECAM detection of a short burst probably from SGR J1555.2-5402
  60. GRB 211024B: Swift detection of a burst
  61. Fermi-LAT Gamma-ray Observations of IceCube-211023A
  62. GRB 211023B: BOOTES-4/MET and 1.5m OSN optical upper limit
  63. GRB 211023A: AGILE detection
  64. GRB 211022A: AstroSat CZTI detection
  65. GRB 211023B: Swift-XRT refined Analysis
  66. Fermi GRB 211024A: Global MASTER-Net observations report
  67. GRB 211023A: Fermi-LAT detection
  68. GRB 211023B: Swift detection of a possibly short burst with an optical counterpart
  69. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-211020A
  70. BepiColombo MGNS joins the IPN
  71. Fermi trigger No 656268212: Global MASTER-Net observations report
  72. GRB 211018A: Fermi-LAT detection
  73. Fermi trigger No 656288898: Global MASTER-Net observations report
  74. Integral GRB211016.42: Global MASTER-Net observations report
  75. IceCube-210922A: Hard X-ray flux limit for JCMT/SCUBA2 source from NuSTAR observations
  76. Fermi trigger No 655646385: Global MASTER-Net observations report
  77. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  78. Fermi trigger No 655401471: Global MASTER-Net observations report
  79. IceCube-210922A: DESI Observations
  80. GECAM observation of a burst from SGR J1555.2-5402
  81. Konus-Wind detection of GRB 210928A
  82. Fermi trigger No 654854799: Global MASTER-Net observations report
  83. GRB 210930A: Swift-BAT refined analysis
  84. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  85. GRB 210928A: Fermi-LAT detection
  86. Fermi trigger No 654739449: Global MASTER-Net observations report
  87. Swift GRB211001.03: Global MASTER-Net observations report
  88. Swift GRB211001.03: Global MASTER-Net OT detection
  89. Fermi GRB 210929B: Global MASTER-Net observations report
  90. Fermi-LAT Gamma-ray Observations of IceCubeCascade-210926A
  91. GRB 210925B: AstroSat CZTI detection
  92. IPN triangulation of GRB 210925B
  93. GRB 210926A: AstroSat CZTI detection
  94. GRB 210919A: iTelescope T-11 upper limits
  95. GRB 210919A OSN 1.5m Source Confirmation
  96. IceCube-210922A: No significant detection in HAWC
  97. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  98. GRB 210919A: DECam Upper Limits
  99. Fermi-LAT Gamma-ray Observations of IceCube-210922A
  100. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22

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