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"

27938 results found.

  1. IPN triangulation of GRB 220308A (long / very bright)
  2. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  3. GRB 220306B: Tautenburg observations
  4. GRB 220304A Fermi GBM detection
  5. GRB 220306B: Swift-BAT refined analysis
  6. GRB 220306B: AbAO optical observations, possible afterglow candidate
  7. GRB 220306B: BOOTES-1 optical upper limit
  8. GRB 220306B: Swift-XRT refined Analysis
  9. GRB 220306B: Fermi GBM observation
  10. GRB 220306B: Enhanced Swift-XRT position
  11. Swift GRB 220306B: Global MASTER-Net observations report
  12. GRB 220305A: Swift-BAT refined analysis
  13. GRB 220306B: Swift detection of a burst
  14. Fermi GBM Sub-Threshold Detection of GRB 220305A
  15. GRB 220305A: Swift-XRT refined Analysis
  16. GRB 220306A: Fermi GBM Final Real-time Localization
  17. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  18. GRB 220305A: Enhanced Swift-XRT position
  19. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  20. Swift GRB 220305A: Global MASTER-Net observations report
  21. GRB 220305A: Swift-XRT observations
  22. GRB 220305A: Swift detection of a burst
  23. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  24. GRB 220302A: Swift/UVOT Upper Limits
  25. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  26. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  27. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  28. GRB 220302A: Swift-XRT refined Analysis
  29. GRB 220304A: Fermi GBM Final Real-time Localization
  30. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  31. GRB 220302A: BOOTES-5/JGT optical upper limit
  32. Swift resumes autonomous slewing
  33. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  34. GRB 220302A: Enhanced Swift-XRT position
  35. ZTF22aaajecp/AT2022cmc: ATCA detection
  36. GRB 220302A: Swift afterglow detection
  37. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  38. Swift GRB 220302A: Global MASTER-Net observations report
  39. GRB 220302A: Swift detection of a burst
  40. GRB 220228A: Fermi-LAT detection
  41. GRB 220228A: Fermi GBM Final Localization
  42. Konus-Wind detection of GRB 220222A
  43. IceCube-220225A - IceCube observation of a high-energy neutrino candidate track-like event
  44. IPN triangulation of GRB 220222A
  45. ZTF22aaajecp/AT2022cmc: DECam Photometry
  46. GCN Circ.draft on GRB 220222A
  47. GRB 220219B: Swift-XRT observations
  48. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  49. GRB 220223A: Fermi GBM Final Real-time Localization
  50. ZTF22aabjpxh/AT2022cva: 1.5m OSN optical observation
  51. GRB 220222B: Fermi GBM Final Real-time Localization
  52. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  53. GRB 220219B: Swift ToO observations
  54. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  55. GRB 220222A: Fermi GBM Final Real-time Localization
  56. ZTF22aabjpxh/AT2022cva: GMOS-N spectroscopy
  57. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  58. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  59. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  60. Konus-Wind observation of GRB 220219A
  61. IPN triangulation of GRB 220219A
  62. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  63. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  64. GRB 220218A: BOOTES-5/JGT optical upper limit
  65. ZTF22aaajecp/AT2022cmc: Keck DEIMOS Redshift
  66. GRB 220219A: AGILE/MCAL detection
  67. GRB 220219A: Fermi GBM Final Real-time Localization
  68. GRB 220218A: Swift detection of a burst
  69. Swift GRB220218.94: Global MASTER-Net observations report
  70. Konus-Wind detection of GRB 220209A
  71. Swift resumes pointed science observations
  72. ZTF22aaajecp/AT2022cmc: VLT/X-shooter redshift
  73. ZTF22aaajecp/AT2022cmc: NICER X-ray detection
  74. Konus-Wind detection of GRB 220211A
  75. IPN triangulation of GRB 220209A
  76. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  77. ZTF22aaajecp/AT2022cmc: VLA radio detection
  78. GRB 220211A: Fermi GBM observation
  79. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  80. GRB 220214A: Fermi GBM Final Real-time Localization
  81. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  82. IPN triangulation of GRB 220211A (short)
  83. GRB 220210A: Insight-HXMT/HE detection
  84. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  85. GRB 220210A: 1.5m OSN optical upper limit
  86. GRB 220210A: Fermi GBM detection
  87. GRB 220211B: Fermi GBM Final Real-time Localization
  88. GRB 220209A: Fermi-LAT detection
  89. GRB 220210A: Fermi-LAT detection
  90. GRB 220210A: AGILE detection
  91. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  92. GRB 220210A: Swift/BAT-GUANO localization
  93. GRB 220211A: Fermi GBM Final Real-time Localization
  94. GRB 220210A: Fermi GBM Final Real-time Localization
  95. GRB 210919A: Maidanak optical observations
  96. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  97. GRB 220209A: Fermi GBM Detection
  98. GRB 220209A: GECAM detection
  99. GRB 220209A: AGILE/MCAL detection
  100. GRB 220209A: Fermi GBM Final Real-time Localization

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