Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27402 results found.

  1. GRB 220302A: Swift/UVOT Upper Limits
  2. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  3. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  4. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  5. GRB 220304A: BALROG localization (Fermi Trigger / GRB 220304228)
  6. Swift resumes autonomous slewing
  7. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  8. GRB 220302A: Enhanced Swift-XRT position
  9. GRB 220302A: Swift afterglow detection
  10. GRB 220228A: Fermi GBM observation
  11. Konus-Wind detection of GRB 220222A
  12. IceCube-220225A: Upper limits from a search for additional neutrino events in IceCube
  13. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  14. IPN triangulation of GRB 220222A
  15. GRB 220101A: The first example of a Petanova
  16. Konus-Wind observation of GRB 220219B
  17. GCN Circ.draft on GRB 220222A
  18. GRB 220219B: Swift-XRT observations
  19. IceCube-220221A: Upper limits from a search for additional neutrino events in IceCube
  20. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  21. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  22. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  23. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  24. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  25. Fermi trigger No 666962499: Global MASTER-Net observations report
  26. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  27. GRB 220211A: redshift lower limit estimating
  28. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  29. ZTF22aaajecp: GIT optical follow-up observations
  30. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  31. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  32. IPN triangulation of GRB 220211A (short)
  33. GRB 220210A: Insight-HXMT/HE detection
  34. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  35. GRB 220210A: Fermi GBM detection
  36. GRB 220210A: Fermi-LAT detection
  37. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  38. GRB 220210A: Swift/BAT-GUANO localization
  39. Fermi GRB 220210A: Global MASTER-Net observations report
  40. GRB 210919A: Maidanak optical observations
  41. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  42. GRB 220209A: Fermi GBM Detection
  43. GRB 220209A: GECAM detection
  44. IceCube-220205A: Upper limits from a search for additional neutrino events in IceCube
  45. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  46. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  47. IceCube-220205B: No neutrino counterpart candidates in ANTARES search
  48. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  49. GRB 220203A: GECAM detection
  50. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  51. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  52. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  53. IceCube-220202A: Upper limits from a search for additional neutrino events in IceCube
  54. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  55. GRB 220128A: AstroSat CZTI detection
  56. GRB 220130A: Fermi GBM Observation
  57. IPN triangulation of GRB 220128A (long)
  58. GRB 220131B: GECAM detection
  59. GRB 220130A: GECAM detection
  60. GRB 220127A: GECAM detection
  61. IPN triangulation of GRB 220124A
  62. GRB 220124A: GECAM detection
  63. GRB 220117A, GROND observations
  64. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  65. GRB 220117A: Terskol and AbAO optical upper limits
  66. GRB 220118A: TARGET optical upper limit
  67. GRB 220117B: TARGET optical upper limit
  68. GRB 220121B: GECAM detection
  69. Fermi-LAT-ANTARES 220121a: upper limits from a search for coincident neutrinos with IceCube
  70. Fermi-LAT-ANTARES 220121a Coincidence
  71. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  72. IPN triangulation of GRB 211226A
  73. GRB 220117C: Fermi GBM Observation
  74. GRB 220118A: 2.2m CAHA/CAFOS detections
  75. GRB 220118A: Fermi GBM detection
  76. GRB 220118A: COATLI Optical Observations
  77. GRB 211221A: No V & R detection, KAO telescope
  78. GRB 220118A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  79. GRB 220117C: Swift/BAT-GUANO arcminute localization
  80. GRB 220118A: Swift-BAT refined analysis
  81. GRB 220118A: Swift/UVOT Detection
  82. Konus-Wind observation of the recent SGR 1935+2154 activity
  83. GRB 220118A: GIT optical observations
  84. GRB 220118A: Enhanced Swift-XRT position
  85. GRB 220118A: MITSuME Akeno optical observation
  86. GRB 220117B: z-band limit
  87. GRB 220118A: Swift detection of a burst with an optical counterpart
  88. GRB 220117A: MITSuME Akeno optical upper limits
  89. Fermi GBM Sub-Threshold Detection of GRB 220117A
  90. GRB 220117B: Swift-BAT refined analysis
  91. GRB 220117A: Swift-BAT refined analysis
  92. IceCube-220115A: Upper limits from a search for additional neutrino events in IceCube
  93. GRB 220117B: Swift/UVOT Upper Limits
  94. GRB 220117A: Swift/UVOT Upper Limits
  95. GRB 220117A: LCO Optical Observations
  96. GRB 220117A: VLT/X-shooter optical afterglow and redshift
  97. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  98. GRB 220117B: Swift-XRT refined Analysis
  99. GRB 220117A: Swift-XRT refined Analysis
  100. AMON IC_HAWC NuEm-220116A: No neutrino counterpart detected with ANTARES

Advanced

Download all Circulars as a .tar.gz archive:
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