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"

39403 results found.

  1. GRB 221216A: Swift detection of a burst
  2. GRB 221216A: Fermi GBM Final Real-time Localization
  3. IceCube-221216A - IceCube observation of a high-energy neutrino candidate track-like event
  4. Fermi trigger No 692760884: Global MASTER-Net observations report
  5. GRB 221215A: Swift ToO observations
  6. GRB 221215A: Swift/BAT-GUANO arcminute localization
  7. Konus-Wind detection of GRB 221209A
  8. Fermi GRB 221215B: Global MASTER-Net observations report
  9. IPN triangulation of GRB 221209A (long)
  10. GRB 221215B: Fermi GBM Final Real-time Localization
  11. Fermi Gamma-ray Burst Monitor trigger 692760884/221215066 is not a GRB
  12. Swift GRB221215.15: Global MASTER-Net observations report
  13. Fermi trigger No 692713692: Global MASTER-Net observations report
  14. GRB 221215A: Fermi GBM Final Real-time Localization
  15. Swift Trigger 1144538 is not a GRB
  16. Fermi trigger No 692607435: Global MASTER-Net observations report
  17. GRB 221209A: CALET Gamma-Ray Burst Monitor detection
  18. GRB 221212A: Fermi GBM Final Real-time Localization
  19. Fermi GRB 221211A: Global MASTER-Net observations report
  20. GRB 221208A: AstroSat CZTI detection
  21. GRB 221211A: Fermi GBM Final Real-time Localization
  22. IceCube-221210A - IceCube observation of a high-energy neutrino candidate track-like event
  23. IceCube Alert 221210.36: Global MASTER-Net observations report
  24. GRB 221009A: MuSCAT3 observations
  25. GRB 221209A: AstroSat CZTI detection
  26. GRB 221210A: Fermi GBM Final Real-time Localization
  27. GRB 221209B: Fermi GBM Final Real-time Localization
  28. GRB 221209A: Fermi GBM observation
  29. GRB 221203C: AstroSat CZTI detection
  30. GRB 221209A: BALROG localization (Fermi Trigger 692257829 / GRB 221209243)
  31. GRB 221209A: Fermi GBM Final Real-time Localization
  32. GRB 221206B: Fermi GBM observation
  33. GRB 221206B: Swift-XRT observations
  34. GRB 221206B: Detection by GRBAlpha
  35. GRB 221206B: Swift/BAT-GUANO candidate arcminute localization
  36. GRB 221206B: Swift ToO observations
  37. Swift/BAT trigger #1143281 is not a GRB
  38. GRB 221206C: Fermi GBM Final Real-time Localization
  39. GRB 221206B: Fermi GBM Final Real-time Localization
  40. GRB 221206A: Fermi GBM Final Real-time Localization
  41. GRB 221205A: Fermi GBM Final Real-time Localization
  42. GRB 221202B: Detection by VZLUSAT-2
  43. Swift GRB221204.45: Global MASTER-Net observations report
  44. GRB 221203B: Fermi GBM Final Real-time Localization
  45. GRB 221202A: Swift/UVOT Detection
  46. GRB 221202A: Swift-BAT refined analysis
  47. GRB 221202A: VLT/FORS2 Afterglow Discovery
  48. GRB 221201A: Swift-BAT refined analysis
  49. GRB 221203A: Fermi GBM Final Real-time Localization
  50. GRB 221201A: Fermi GBM observation
  51. GRB 221202A: Swift-XRT refined Analysis
  52. GRB 221202A: LCOGT Optical Upper Limits
  53. GRB 221202A: Enhanced Swift-XRT position
  54. GRB 221202A: MeerLICHT upper limits
  55. GRB 221202B: Fermi GBM Final Real-time Localization
  56. GRB 221202A: Swift detection of a burst
  57. Swift GRB221202.84: Global MASTER-Net observations report
  58. GCN: GRB 221201A: Swift/UVOT Upper Limits
  59. GRB 221201A: Swift-XRT refined Analysis
  60. GRB 221201A: Enhanced Swift-XRT position
  61. Swift GRB 221201A: Global MASTER-Net observations report
  62. Konus-Wind detection of GRB 221124A
  63. GRB 221201A: Swift detection of a burst
  64. GRB 221201A: Fermi GBM Final Real-time Localization
  65. Fermi Gamma-ray Burst Monitor trigger 691534074/221130867 is not a GRB
  66. Optical polarization observation of GRB 221009A
  67. GRB 221126A: Fermi GBM observation
  68. GRB 221126A: AGILE detection
  69. GRB 221127A: Detection by GRBAlpha
  70. GRB 221126A: AstroSat CZTI detection
  71. IceCube-221124A: BOOTES-4/MET and BOOTES-2/TELMA optical upper limit
  72. GRB 221126A: Swift/BAT-GUANO detection outside the coded FOV
  73. IPN triangulation of GRB 221124A (long)
  74. GRB 221126A: Fermi GBM Final Real-time Localization
  75. GRB 221124A: Swift/BAT-GUANO detection
  76. Fermi-LAT gamma-ray observations of IceCube-221124A
  77. GRB 221120A: Detection by VZLUSAT-2
  78. GRB 221124A: CALET Gamma-Ray Burst Monitor detection
  79. IceCube-221124A - IceCube observation of a high-energy neutrino candidate track-like event
  80. IceCube Alert 221124.66: Global MASTER-Net observations report
  81. GRB 221120A: TURBO Optical Upper Limit
  82. GRB 221122A: Detection by GRBAlpha
  83. GRB 221120A: VIRT Optical Upper Limit
  84. GRB 221121A: CALET Gamma-Ray Burst Monitor detection
  85. GRB 221009A：DAMPE observed a 34.7 GeV photon at 1.36 hour after the GBM trigger
  86. GRB 221120A: GTC Confirmation of an Underlying Galaxy
  87. IPN triangulation of GRB 221121A (long)
  88. GRB 221120A: Swift-BAT refined analysis
  89. GRB221121A: AstroSat CZTI detection
  90. GRB 221120A: AKO Telescope Upper Limits
  91. GRB221120A: WIRC near-IR imaging of the afterglow candidate
  92. GRB 221120A: Liverpool Telescope Upper Limits
  93. GRB 221120A: Archival PS1 Imaging of Faint Source near XRT position
  94. GRB 221120A: Fermi GBM observation
  95. GRB 221120A: Swift-XRT refined Analysis
  96. GRB 221120A: Enhanced Swift-XRT position
  97. GRB 221121A: Fermi GBM Final Real-time Localization
  98. GRB 221120A is a short burst
  99. GRB 221120A: Swift/UVOT Upper Limits
  100. GRB 221120A: LDT Optical Afterglow Candidate

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