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"

12113 results found.

  1. Fermi-LAT Gamma-ray Observations of IceCube-211125A
  2. GRB 211120548: Fermi GBM observation
  3. Konus-Wind detection of GRB 211120A
  4. IPN triangulation of GRB 211120A
  5. Chandra observations of GRB 210905A
  6. Fermi-LAT Gamma-ray Observations of IceCube-211123A
  7. IceCube-211123A: Upper limits from Fermi-GBM Observations
  8. GRB 211124A: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  9. Fermi trigger No 659413798: Global MASTER-Net observations report
  10. GRB 211120A: AGILE detection
  11. GRB 211120A: AstroSat CZTI detection
  12. GRB 211120B: Swift/BAT-GUANO detection outside the coded FOV
  13. GRB 211118A: AstroSat CZTI detection
  14. GRB 211023A: optical observations and photometric evidence of supernova
  15. Fermi-LAT Gamma-ray Observations of IceCube-211117A
  16. GRB211118A: Swift/BAT-GUANO detection outside the coded FOV
  17. Fermi trigger No 658971499: Global MASTER-Net observations report
  18. Fermi-LAT Gamma-ray Observations of IceCube-211116A
  19. Fermi trigger No 658755664: Global MASTER-Net observations report
  20. Konus-Wind detection of GRB 211107B
  21. GRB 211115A: MAXI/GSC detection
  22. GRB 211023A: classification and SPI-ACS/INTEGRAL registration
  23. Fermi GRB 211112A: Global MASTER-Net observations report
  24. GRB 211110A: AstroSat CZTI detection
  25. Fermi trigger No 658214822: Global MASTER-Net observations report
  26. GRB 211107B: Swift-XRT afterglow detection
  27. GRB 211107A: GECAM detection
  28. GRB 211106A: VLT/FORS2 optical observations
  29. Fermi GRB 211109B: Global MASTER-Net observations report
  30. Fermi GRB 211109A: Global MASTER-Net observations report
  31. Konus-Wind detection of GRB 211106A
  32. GRB 211023A: BTA spectroscopic redshift
  33. GRB 211107A: Fermi GBM Final Real-time Localization
  34. GRB 211106A: Swift/BAT-GUANO candidate arcminute localization of a short burst
  35. GRB 211105A: MASTER optical inspection
  36. GRB 211105A: Swift/BAT-GUANO detection outside the coded FOV
  37. GRB 211105A: AGILE detection of a burst
  38. Fermi trigger No 657742914: Global MASTER-Net observations report
  39. GRB 211102B: GECAM detection
  40. Konus-Wind detection of GRB 211023A
  41. Fermi GRB 211027A: Global MASTER-Net observations report
  42. GRB 211025A: Swift-XRT refined Analysis
  43. GRB 211024B: Swift-XRT refined Analysis
  44. GRB 210610B: Sintesz-Newton/CrAO optical observations
  45. GRB 211025A: Swift detection of a burst
  46. GECAM detection of a short burst probably from SGR J1555.2-5402
  47. GRB 211024B: Swift detection of a burst
  48. Fermi-LAT Gamma-ray Observations of IceCube-211023A
  49. GRB 211023B: BOOTES-4/MET and 1.5m OSN optical upper limit
  50. GRB 211023A: AGILE detection
  51. GRB 211022A: AstroSat CZTI detection
  52. GRB 211023B: Swift-XRT refined Analysis
  53. Fermi GRB 211024A: Global MASTER-Net observations report
  54. GRB 211023A: Fermi-LAT detection
  55. GRB 211023B: Swift detection of a possibly short burst with an optical counterpart
  56. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-211020A
  57. BepiColombo MGNS joins the IPN
  58. Fermi trigger No 656268212: Global MASTER-Net observations report
  59. GRB 211018A: Fermi-LAT detection
  60. Fermi trigger No 656288898: Global MASTER-Net observations report
  61. Integral GRB211016.42: Global MASTER-Net observations report
  62. IceCube-210922A: Hard X-ray flux limit for JCMT/SCUBA2 source from NuSTAR observations
  63. Fermi trigger No 655646385: Global MASTER-Net observations report
  64. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  65. Fermi trigger No 655401471: Global MASTER-Net observations report
  66. IceCube-210922A: DESI Observations
  67. GECAM observation of a burst from SGR J1555.2-5402
  68. Konus-Wind detection of GRB 210928A
  69. Fermi trigger No 654854799: Global MASTER-Net observations report
  70. GRB 210930A: Swift-BAT refined analysis
  71. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  72. GRB 210928A: Fermi-LAT detection
  73. Fermi trigger No 654739449: Global MASTER-Net observations report
  74. Swift GRB211001.03: Global MASTER-Net observations report
  75. Swift GRB211001.03: Global MASTER-Net OT detection
  76. Fermi GRB 210929B: Global MASTER-Net observations report
  77. Fermi-LAT Gamma-ray Observations of IceCubeCascade-210926A
  78. GRB 210925B: AstroSat CZTI detection
  79. IPN triangulation of GRB 210925B
  80. GRB 210926A: AstroSat CZTI detection
  81. GRB 210919A: iTelescope T-11 upper limits
  82. GRB 210919A OSN 1.5m Source Confirmation
  83. IceCube-210922A: No significant detection in HAWC
  84. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  85. GRB 210919A: DECam Upper Limits
  86. Fermi-LAT Gamma-ray Observations of IceCube-210922A
  87. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  88. GRB 210912A: LBT optical observations
  89. GRB 210919A: AbAO optical upper limit
  90. Swift GRB 210919A: Global MASTER-Net observations report
  91. Swift trigger 1073821: detection of IGR J16418-4532
  92. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  93. Konus-Wind observation of the recent SGR 1935+2154 activity
  94. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  95. AGILE observations of two bright bursts from SGR 1935+2154
  96. GRB 210912A: CAHA 2.2m Detection
  97. GRB 210912A: Swift-XRT refined Analysis
  98. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  99. Swift GRB 210912A: Global MASTER-Net observations report
  100. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)

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