Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

14983 results found.

  1. GRB200817B: AstroSat CZTI detection
  2. GRB 200903B: Fermi GBM Final Real-time Localization
  3. GRB 200903A: Swift detection of a burst
  4. GRB 200903A: Fermi GBM Final Real-time Localization
  5. GRB 200901A: MASTER OT early detection
  6. GRB 200901B: Swift/UVOT Detection
  7. GRB 200901A: Swift/UVOT Detection
  8. GRB 200901B: Swift detection of a burst
  9. GRB 200901A: Swift detection of a burst
  10. GRB 200829A: Fermi GBM detection
  11. Konus-Wind detection of GRB 200829A (a clone of GRB 200826B?)
  12. GRB 200830A: Fermi GBM Final Real-time Localization
  13. GRB 200826A
  14. GRB200829A: optical afterglow detection
  15. GRB 200829A: Global MASTER-Net OT detection
  16. GRB 200829A: AGILE/MCAL detection
  17. GRB 200829A: Swift/UVOT Detection
  18. GRB 200829A: Swift detection of a burst with an optical afterglow
  19. Zwicky Transient Facility discovery of ZTF20abtxwfx/AT2020sev, a fast optical transient and candidate afterglow
  20. Konus-Wind detection of GRB 200826B
  21. IPN triangulation of GRB 200826B
  22. GRB 200826A: VLA Detection at 6 GHz
  23. GRB 200826A: further analysis of the Konus-Wind data and classification
  24. GRB 200826A: Swift-XRT afterglow detection
  25. GRB 200824A: Insight-HXMT/HE detection
  26. GRB 200826B: Fermi GBM detection
  27. GRB200826A: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi Short GRB (Trigger 620108997)
  28. Konus-Wind detection of GRB 200826A
  29. GRB200826A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 620108997)
  30. GRB 200826B: Fermi GBM Final Real-time Localization
  31. IPN triangulation of GRB 200826A (short/bright)
  32. GRB 200826A: AGILE detection
  33. GRB 200826A: AstroSat CZTI detection
  34. GRB 200826A: Fermi GBM Final Real-time Localization
  35. GRB 200824A: Fermi GBM Final Real-time Localization
  36. Swift Trigger 992444: a possible GRB 200821A
  37. Konus-Wind observation of GRB 200815A
  38. IPN triangulation of GRB 200815A (short)
  39. GRB 200819A: Swift detection of a burst
  40. GRB 200818A: Fermi GBM Final Localization
  41. GRB 200815A: CALET Gamma-Ray Burst Monitor detection of a short burst
  42. GRB 200817A: Fermi GBM Final Real-time Localization
  43. Swift trigger 990358 is not an astrophysical source
  44. Swift trigger 989458 is likely not an astrophysical source
  45. IceCube200806A: No significant detection in HAWC
  46. GRB 200811A: Fermi GBM Final Real-time Localization
  47. GRB 200809B: Fermi GBM detection
  48. GRB 200809B: Swift-XRT afterglow detection
  49. GRB 200809B: MAXI/GSC detection
  50. GRB 200809B: AstroSat CZTI detection
  51. GRB 200809B: Swift/BAT-GUANO detection and arcminute localization
  52. GRB 200809B: Fermi GBM Final Real-time Localization
  53. GRB 200808A: AGILE detection
  54. GRB 200806A: CALET Gamma-Ray Burst Monitor detection
  55. GRB 200809A: Fermi GBM Final Real-time Localization
  56. GRB 200808A: Fermi GBM Final Real-time Localization
  57. IPN triangulation of GRB 200805A (short)
  58. GRB 200806A: CAHA optical afterglow confirmation
  59. GRB 200806A: Swift/UVOT Possible Detection
  60. GRB 200805A: CALET Gamma-Ray Burst Monitor detection of a short burst
  61. GRB 200806A: AstroSat CZTI detection
  62. GRB 200806A: Swift detection of a burst
  63. IceCube-200806A: IceCube observation of a high-energy neutrino candidate event
  64. GRB 200803B: MASTER possibly OT discovery
  65. GRB 200803A: AstroSat CZTI detection
  66. GRB 200803A: Fermi GBM detection
  67. GRB 200803A: Swift-XRT afterglow detection
  68. GRB 200803A: Fermi-LAT detection
  69. GRB 200803A: MASTER optical counterpart discovery
  70. GRB 200803B: Fermi GBM Final Real-time Localization
  71. GRB 200801B: AstroSat CZTI detection
  72. GRB 200803A: Fermi GBM Final Real-time Localization
  73. Konus-Wind detection of GRB 200729A
  74. GRB 200802A: Fermi GBM Final Real-time Localization
  75. Swift Detection of an SGR-like flare from AX J1846.4-0258
  76. GRB 200801B: Fermi GBM Final Real-time Localization
  77. GRB 200801A: Fermi GBM Final Real-time Localization
  78. GRB 200729A: RT-22 observations at 36.8 GHz
  79. GRB 200729A: further analysis of the NOT data
  80. GRB 200729A: Pan-STARRS pre-explosion source detection
  81. GRB 200729A: Spitzer archival source detection
  82. GRB 200729A: NOT optical upper limits
  83. GRB200729A: BOOTES-1 optical upper limit
  84. GRB 200729A: Swift detection of a burst
  85. IceCube GCN Notice 134327_10548129 retraction
  86. GRB 200724A: Fermi GBM Final Real-time Localization
  87. GRB 200723A: Fermi GBM Final Real-time Localization
  88. GRB 200716C: CAHA optical observation // Anomalous light curve behavior?
  89. GRB 200714E: Swift-XRT afterglow detection
  90. GRB 200716C: FRAM-ORM afterglow detection
  91. Konus-Wind observation of GRB 200716C: correction to GCN 28147
  92. Konus-Wind observation of GRB 200716C
  93. GRB 200716C: VIRT optical detection.
  94. GRB 200716C: Insight-HXMT/HE detection
  95. AMON IC_HAWC 170720: No Neutrino Counterpart detected with ANTARES
  96. GRB 200718A: Fermi GBM Final Real-time Localization
  97. GRB 200716C: CALET Gamma-Ray Burst Monitor detection
  98. GRB 200716B: Insight-HXMT/HE detection
  99. GRB 200716C: Fermi GBM detection
  100. GRB 200716C: AGILE/MCAL detection

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