Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
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"
  1. GRB 220219A: AGILE/MCAL detection
  2. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  3. GRB 220219A: Fermi GBM Final Real-time Localization
  4. GRB 220218A: Swift detection of a burst
  5. Swift GRB220218.94: Global MASTER-Net observations report
  6. GRB 220211A: redshift lower limit estimating
  7. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  8. Konus-Wind detection of GRB 220209A
  9. Swift resumes pointed science observations
  10. ZTF22aaajecp/AT2022cmc: VLT/X-shooter redshift
  11. ZTF22aaajecp/AT2022cmc: NICER X-ray detection
  12. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  13. Konus-Wind detection of GRB 220211A
  14. IPN triangulation of GRB 220209A
  15. ZTF22aaajecp: GIT optical follow-up observations
  16. GRB 211023A: evidence of supernova in LBT spectra
  17. ZTF22aaajecp/AT2022cmc: GMOS-N spectroscopy
  18. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  19. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  20. ZTF22aaajecp/AT2022cmc: VLA radio detection
  21. GRB 220211A: Fermi GBM observation
  22. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  23. Fermi trigger No 666489765: Global MASTER-Net observations report
  24. GRB 220214A: Fermi GBM Final Real-time Localization
  25. Fermi GBM trigger 666393834/220212892 is not a GRB
  26. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  27. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220212A
  28. IPN triangulation of GRB 220211A (short)
  29. GRB 220210A: Insight-HXMT/HE detection
  30. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  31. GRB 220210A: 1.5m OSN optical upper limit
  32. GRB 220210A: Fermi GBM detection
  33. Fermi GRB 220211B: Global MASTER-Net observations report
  34. GRB 220211B: Fermi GBM Final Real-time Localization
  35. GRB 220209A: Fermi-LAT detection
  36. GRB 220210A: Fermi-LAT detection
  37. GRB 220210A: AGILE detection
  38. GRB 220210A: BOOTES-5/JGT optical afterglow candidate discarded
  39. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  40. GRB 220210A: Swift/BAT-GUANO localization
  41. Fermi GRB 220211A: Global MASTER-Net observations report
  42. GRB 220211A: Fermi GBM Final Real-time Localization
  43. Fermi GRB 220210A: Global MASTER-Net observations report
  44. GRB 220210A: Fermi GBM Final Real-time Localization
  45. GRB 210919A: Maidanak optical observations
  46. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  47. GRB 220209A: Fermi GBM Detection
  48. GRB 220209A: GECAM detection
  49. GRB 220209A: AGILE/MCAL detection
  50. Fermi GRB 220209A: Global MASTER-Net observations report
  51. GRB 220209A: Fermi GBM Final Real-time Localization
  52. IceCube-220205B: Upper limits from a search for additional neutrino events in IceCube
  53. IceCube-220205A: Upper limits from a search for additional neutrino events in IceCube
  54. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  55. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  56. IceCube-220205B: No neutrino counterpart candidates in ANTARES search
  57. Konus-Wind detection of GRB 220130A
  58. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  59. Konus-Wind detection of GRB 220203A
  60. GRB 220203A: GECAM detection
  61. IceCube-220205A - IceCube observation of a high-energy neutrino candidate track-like event
  62. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  63. IPN triangulation of GRB 220203A (short)
  64. IPN triangulation of GRB 220130A
  65. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  66. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  67. IceCube-220202A: Upper limits from a search for additional neutrino events in IceCube
  68. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  69. IceCube-220202A: IceCube observation of a high-energy neutrino candidate track-like event
  70. IceCube Alert 220202.49: Global MASTER-Net observations report
  71. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  72. GRB 220201A: Fermi GBM Final Localization
  73. GRB 220128A: AstroSat CZTI detection
  74. GRB 220130A: Fermi GBM Observation
  75. Konus-Wind detection of GRB 220128A
  76. IPN triangulation of GRB 220128A (long)
  77. Fermi GRB 220131A: Global MASTER-Net observations report
  78. GRB 220131B: GECAM detection
  79. GRB 220130A: GECAM detection
  80. GRB 220131A: Fermi GBM Final Real-time Localization
  81. Fermi GRB 220129A: Global MASTER-Net observations report
  82. GRB 220129A: Fermi GBM Final Real-time Localization
  83. IceCube-211208A: the optical observation of the candidate PKS0735+178
  84. GRB 220127A: GECAM detection
  85. GECAM observations of a series of bursts from SGR J1935+2154
  86. Konus-Wind detection of GRB 220124A
  87. IPN triangulation of GRB 220124A
  88. GRB 220124A: GECAM detection
  89. Fermi trigger No 664738369: Global MASTER-Net observations report
  90. GRB 220117A, GROND observations
  91. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  92. GRB 220117A: Terskol and AbAO optical upper limits
  93. GRB 220118A: TARGET optical upper limit
  94. GRB 220117B: TARGET optical upper limit
  95. GRB 220121B: GECAM detection
  96. Fermi-LAT-ANTARES 220121a: upper limits from a search for coincident neutrinos with IceCube
  97. AGILE observations of a bright burst from SGR 1935+2154
  98. Fermi-LAT-ANTARES 220121a Coincidence
  99. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  100. IPN triangulation of a bright burst from SGR 1935+2154

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