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"

11631 results found.

  1. GRB 240222A: ATCA radio observations
  2. Fermi trigger No 730618809: Global MASTER-Net observations report
  3. Transient EPW20240219aa: Xinglong-2.16m optical upper limit
  4. GRB 240225A: Swift/BAT-GUANO detection of a short burst
  5. GRB 240222A: GRBAlpha detection
  6. Transient EPW20240219aa: Mondy optical observations
  7. Transient EPW20240219aa: upper limit in gamma-ray range from SPI-ACS/INTEGRAL observations
  8. Insight-HXMT/HE Sub-Threshold Detection of Transient EPW20240219aa
  9. Swift BAT Sub-Threshold Detection of EPW20240219aa
  10. GRB 240222A: GECAM detection of a burst
  11. GRB 240222A: Fermi GBM Observation
  12. Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB
  13. Fermi GRB 240222A: Global MASTER-Net observations report
  14. EPW20240219aa is Likely a GRB Event
  15. GRB 240222A: Fermi GBM Final Real-time Localization
  16. GRB 240216A: Glowbug gamma-ray detection
  17. GRB 240215B: Fermi GBM Observation
  18. GRB 240218A: LBT H-band detection
  19. Fermi GRB 240220A: Global MASTER-Net observations report
  20. GRB 240220A: Fermi GBM Final Real-time Localization
  21. Konus-Wind detection of GRB 240218A
  22. GRB 240218A: VLT/X-shooter redshift of z = 6.782
  23. GRB 240218A: Fermi GBM Detection
  24. GRB 240215A: Fermi GBM Observation
  25. GRB 240216A: GRBAlpha detection
  26. GRB 240215B: GRBAlpha detection
  27. IPN triangulation of GRB 240209A
  28. Fermi trigger No 729914426: Global MASTER-Net observations report
  29. Gamma-ray flaring activity from the blazar 1ES 1959+650 observed by the Fermi-LAT
  30. GRB 240213A: GRBAlpha detection
  31. GRB 240215C: Fermi GBM Final Real-time Localization
  32. GRB 240215B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  33. Fermi GRB 240216A: Global MASTER-Net observations report
  34. GRB 240216A: Fermi GBM Final Real-time Localization
  35. Fermi trigger No 729719508: Global MASTER-Net observations report
  36. GRB 240215A: Swift/BAT-GUANO localization of a burst
  37. Fermi trigger No 729703985: Global MASTER-Net observations report
  38. Fermi trigger No 729650855: Global MASTER-Net observations report
  39. GRB 240209A: Classification of AT2024cew/GOTO24pw as Type Ia-pec supernova
  40. GRB 240209A: Fermi GBM observation
  41. GRB 240213A: Glowbug gamma-ray detection
  42. GRB240209A: OHP/T193 detection of the GOTO afterglow candidate AT2024cew / GOTO24pw
  43. GRB 240209A: Wendelstein Optical Observations
  44. GRB 240213A: BALROG localization (Fermi Trigger / GRB 240213841)
  45. Fermi GRB 240213A: Global MASTER-Net observations report
  46. GRB 240213A: Fermi GBM Final Real-time Localization
  47. GRB 240209A: NOEMA non-detection of AT2024cew / GOTO24pw counterpart candidate
  48. GRB 240209A: NOT photometry of the AT2024cew / GOTO24pw counterpart candidate
  49. GRB 240209A: GOTO optical counterpart candidate
  50. Konus-Wind detection of GRB 240204A
  51. Konus-Wind detection of GRB 240205A (short)
  52. GRB 240209A: Fermi GBM Final Localization
  53. Fermi trigger No 729152364: Global MASTER-Net observations report
  54. IPN triangulation of GRB 240205A (short)
  55. Fermi-LAT gamma-ray observations of IceCube-240204A
  56. GRB 240205B: PRIME near infrared detection
  57. GRB 240205A (short): Glowbug gamma-ray detection
  58. GRB 240205B: AstroSat CZTI detection
  59. Fermi trigger No 729012023: Global MASTER-Net observations report
  60. Konus-Wind detection of GRB 240205B (long / very soft)
  61. GRB 240207A: Fermi GBM Final Real-time Localization
  62. GRB 240205B: VLT/X-shooter redshift
  63. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  64. GRB 240205B: BOOTES-6 optical afterglow follow-up
  65. GRB 240205B: ATCA detection of radio counterpart
  66. GRB 240205B: REM detection of the optical/NIR afterglow
  67. GRB 240205B: Fermi GBM Observation
  68. GRB 240204A: AstroSat CZTI detection
  69. GRB 240204A: Mondy optical afterglow observations
  70. GRB 240204A : OHP/T193/T120 optical afterglow fading detection
  71. GRB 240205B: GECAM detection of a long burst
  72. GRB 240205B: Skynet Optical Afterglow Observations
  73. GRB 240205B: BOOTES-7 optical afterglow follow-up
  74. Fermi trigger No 728749569: Global MASTER-Net observations report
  75. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  76. GRB 240205B: Fermi GBM Final Real-time Localization
  77. GRB 240204A: Fermi GBM Observation
  78. GRB 240205A: Fermi GBM Final Real-time Localization
  79. GRB 240204a: Liverpool Telescope optical afterglow detection
  80. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  81. Fermi Gamma-ray Burst Monitor trigger 728740048/240204491 is not a GRB
  82. Fermi trigger No 728796365: Global MASTER-Net observations report
  83. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  84. GRB 240204A: Montarrenti Observatory optical observations
  85. GRB 240204A: Mondy optical afterglow candidate
  86. Fermi Gamma-ray Burst Monitor trigger 728706420/240204102 is not a GRB
  87. Fermi GRB 240204A: Global MASTER-Net observations report
  88. Fermi trigger No 728706420: Global MASTER-Net observations report
  89. GRB 240204A: Swift detection of a burst
  90. IceCube-240204A - IceCube observation of a high-energy neutrino candidate track-like event
  91. GRB 240204A: Fermi GBM Final Real-time Localization
  92. GRB 230812B: Update on Bad Time Intervals for Fermi GBM data
  93. GRB 240129A: Fermi GBM Observation
  94. IPN triangulation of GRB 240125B (short)
  95. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  96. Fermi GRB 240127A: Global MASTER-Net observations report
  97. GRB 240127A: Fermi GBM Final Real-time Localization
  98. GRB 240125B: Fermi GBM Final Localization
  99. GRB 240123B: Fermi GBM Observation
  100. GRB 240123A: Glowbug gamma-ray 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