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"

11793 results found.

  1. IceCube-Cascade 230329A: Upper limits from a search for additional neutrino events in IceCube
  2. GRB 230328B: 3.6m DOT multiband optical observation
  3. Fermi trigger No 701883729: Global MASTER-Net observations report
  4. Konus-Wind detection of GRB 230328B
  5. GRB 230328B: Liverpool Telescope afterglow detection
  6. GRB 230328B: OHP/T120 optical observations
  7. GRB 230328B: Swift-XRT refined Analysis
  8. GRB 230328B: AstroSat CZTI detection
  9. GRB 230328B: Mondy, AbAO and Kitab optical observations
  10. GRB 230328B: Swift detection of a burst with an optical afterglow
  11. GRB 230325A: Swift-XRT refined Analysis
  12. GRB 230325A: Swift detection of a burst
  13. GRB 230320B: Fermi GBM Observation
  14. Konus-Wind detection of GRB 230309A
  15. Konus-Wind detection of GRB 230308A
  16. Konus-Wind detection of GRB 230304B
  17. GRB 230322B: Swift-XRT refined Analysis
  18. GRB 230322B: Swift detection of a burst with optical counterpart
  19. GRB 230322A: Fermi GBM Final Real-time Localization
  20. GRB 230320B: GRBAlpha detection
  21. GRB 230320B: CALET Gamma-Ray Burst Monitor detection
  22. Fermi trigger No 701071944: Global MASTER-Net observations report
  23. SGR 1806-20: Correction to GCN 33494
  24. INTEGRAL detection of a burst from SGR 1806-200
  25. GRB 230321B: AstroSat CZTI detection
  26. GRB 230320B: AstroSat CZTI detection
  27. GRB 230320A: Fermi GBM Final Real-time Localization
  28. GRB 230314A: TURBO Optical Upper Limit
  29. Fermi trigger No 700976129: Global MASTER-Net observations report
  30. IPN triangulation of GRB 230309A
  31. Fermi GRB 230316A: Global MASTER-Net observations report
  32. GRB 230304D: AstroSat CZTI detection
  33. GRB 230313A: AstroSat CZTI detection
  34. VZLUSAT-2 detection of SGR 1806-20
  35. GRB 230307A: INTEGRAL upper limit on Hard X-ray afterglow
  36. Fermi GRB 230313A: Global MASTER-Net observations report
  37. GRB 230309A: AstroSat CZTI detection of a bright long GRB
  38. Further improved IPN localization for GRB 230307A
  39. Swift GRB230311.84: Global MASTER-Net observations report
  40. Trigger 1159327: Swift detection of SGR1806-20
  41. GRB 230310A: AstroSat CZTI detection
  42. GRB 230307A: GECKO optical observations and detections of the afterglow
  43. GRB 230307A: MAXI/GSC upper limit
  44. GRB 230307A: ASO-S/HXI detection
  45. GRB 230217A: ATCA rapid-response radio detection
  46. GRB 230307A: Upper limits from a neutrino search with IceCube
  47. Fermi GRB 230307A: Global MASTER-Net observations report
  48. Konus-Wind detection of GRB 230307A
  49. Fermi GRB 230308A: Global MASTER-Net observations report
  50. GRB 230307A: AstroSat CZTI detection
  51. Fermi-LAT gamma-ray observations of IceCube-230306A
  52. GRB 230307A: GECAM detection of an extremely bright burst
  53. GRB 230304C: AstroSat CZTI detection
  54. GRB 230304B: AstroSat CZTI detection
  55. GRB 230304A: AstroSat CZTI detection
  56. GRB 230304A: Fermi GBM Final Real-time Localization
  57. Fermi GRB 230301B: Global MASTER-Net observations report
  58. GRB 230228A: Fermi GBM Observation
  59. Fermi trigger No 699294715: Global MASTER-Net observations report
  60. GRB 230228A: Swift-XRT refined Analysis
  61. GRB 230228A: Swift detection of a possibly short burst
  62. Fermi trigger No 699029364: Global MASTER-Net observations report
  63. GRB 230217A: VLT/FORS2 optical observations and candidate counterpart
  64. GRB 230216A Mondy Observations
  65. IceCube-230220A: Upper limits from a search for additional neutrino events in IceCube
  66. GRB 230220A: Correction to GCN 33352
  67. Fermi-LAT gamma-ray observations of IceCube-230220A
  68. Fermi GRB 230220B: Global MASTER-Net observations report
  69. GRB 230217A: AstroSat CZTI detection
  70. GRB 230217A: 6 GHz VLA observations
  71. GRB 230220B: Fermi GBM Final Real-time Localization
  72. GRB 230217A: Gemini-South Optical Observation
  73. IceCube-230217A: Upper limits from a search for additional neutrino events in IceCube
  74. IceCube-230220A - IceCube observation of a high-energy neutrino candidate
  75. GRB 230220A: MAXI/GSC detection
  76. IceCube-230217A: BOOTES-4/MET Optical Observations
  77. Fermi-LAT gamma-ray observations of IceCube-230217A
  78. Konus-Wind detection of GRB 230217A
  79. GRB 230216B: AstroSat CZTI detection
  80. IceCube-230217A - IceCube observation of a high-energy neutrino candidate track-like event
  81. GRB 230216A: Swift-BAT refined analysis
  82. GRB 230216A: Swift detection of a burst
  83. Fermi trigger No 697904388: Global MASTER-Net observations report
  84. Fermi GRB 230209B: Global MASTER-Net observations report
  85. Fermi Gamma-ray Burst Monitor triggers 230206723/697396830 and 230206797/697403223 are not GRBs
  86. Fermi trigger No 697403223: Global MASTER-Net observations report
  87. Fermi trigger No 697396830: Global MASTER-Net observations report
  88. GRB 230205A: Swift-XRT refined Analysis
  89. GRB 230205A: BOOTES-5/JGT early optical upper limit
  90. GRB 230204B: AGILE detection
  91. GRB 230205A: Swift detection of a burst
  92. IceCube-230201A: BOOTES-4/MET Optical Upper Limits
  93. GRB 230204B: AstroSat CZTI detection
  94. GRB 230204B: MAXI/GSC detection
  95. Fermi trigger No 697208885: Global MASTER-Net observations report
  96. Fermi trigger No 697098930: Global MASTER-Net observations report
  97. IceCube-230201A: Upper limits from a search for additional neutrino events in IceCube
  98. ZTF23aabmzlp/AT2023azs: Lulin 1m LOT optical observations
  99. Fermi GRB 230201B: Global MASTER-Net observations report
  100. Fermi-LAT gamma-ray observations of IceCube-230201A

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