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"

37645 results found.

  1. GRB 260909A: Mondy optical observations and afterglow candidate
  2. GRB 260909A: Xinglong 2.16m optical upper limit
  3. GRB 260909A: SVOM/C-GFT optical upper limit
  4. GRB 260909A: SVOM detection of a burst
  5. Fermi trigger No 810554827: Global MASTER-Net observations report
  6. GRB 260907A: Glowbug gamma-ray detection of a likely short burst
  7. GRB 260903A: Swift ToO observations
  8. Fermi GRB 260907B: Global MASTER-Net observations report
  9. GRB 260903A: SAO RAS optical upper limit
  10. GRB 260907B: Fermi GBM Final Real-time Localization
  11. Fermi GRB 260907A: Global MASTER-Net observations report
  12. GRB 260907A: Fermi GBM Final Real-time Localization
  13. GRB 260903A: J-band upper limit with WINTER
  14. GRB 260903A: SVOM/ECLAIRs refined analysis
  15. GRB260903A: Liverpool Telescope optical observations
  16. GRB 260903A: SAO RAS optical observations
  17. GRB 260830A: GECAM-B detection of a burst
  18. GRB 260830A: Insight-HXMT/HE detection
  19. GRB 260903A: EP-FXT follow-up observation
  20. GRB 260903A: OHP/T193 optical afterglow detection
  21. GRB 260903A: NOT optical observations and afterglow fading
  22. GRB 260903A: LCO optical observations
  23. GRB 260903A: SVOM/VT optical candidate
  24. GRB 260903A: Retraction of optical counterpart of GCN 45501
  25. GRB 260831A: GECAM-B observation
  26. GRB 260903A: LCO optical counterpart detection
  27. GRB 260827A: Insight-HXMT/HE detection
  28. GRB 260903A: SVOM detection of a soft faint burst
  29. Konus-Wind detection of GRB 260829A
  30. GRB 260829A: SVOM/GRM observation
  31. GRB 260818A: ATCA detection of a candidate radio counterpart
  32. GRB 260831B / sb26083106: SVOM/GWAC-F60A/B confirmation of optical variation of nova V* GK Per
  33. GRB 260831B / sb26083106: SVOM/VT optical variability of V* GK Per
  34. SVOM trigger sb26083106 is not a GRB
  35. GRB 260829A: AstroSat CZTI detection
  36. GRB 260831B: EP-FXT follow-up observation
  37. GRB 260830A: NuSTAR detection of prompt emission
  38. GRB 260831B: LCO optical upper limits
  39. GRB 260827A: SVOM/GRM observation
  40. GRB 260831B: SVOM detection of a possible burst
  41. IPN triangulation of GRB 260829A
  42. GRB 260827A: Glowbug gamma-ray detection
  43. GRB 260831A: Fermi GBM Final Real-time Localization
  44. Fermi-LAT Gamma-ray Observations of IceCube-260827A
  45. Fermi-LAT Gamma-ray Observations of IceCube-260825A
  46. GRB 260829A: GECAM-B observation of a long burst
  47. GRB 260825A: SVOM/GRM observation of a long burst
  48. GRB 260825A: GECAM-B observation
  49. GRB 260829A: Fermi GBM Detection
  50. GRB 260825A: AstroSat CZTI detection
  51. GRB 260829A: BALROG localization (Fermi Trigger 809676494 / GRB 260829256)
  52. GRB 260829A: Fermi GBM Final Real-time Localization
  53. Fermi GBM trigger 809666623/260829141 is not a GRB
  54. GRB 260818B: Further EP-FXT observation
  55. GRB 260818B: VLT optical and nIR observations
  56. GRB 260818B: TNG NIR observations
  57. IceCube-260827A - IceCube observation of a high-energy neutrino candidate track-like event
  58. GRB 260827A: Fermi GBM Final Real-time Localization
  59. GRB 260818B: 6 GHz VLA observations
  60. GRB 260818B: SVOM/VT optical upper limit and continuous observations
  61. GRB 260818B: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  62. GRB 260808B: SAO RAS observations of the optical rebrightening
  63. GRB 260807A: EP-FXT follow-up observations
  64. GRB 260822A: SVOM/ECLAIRs refined analysis
  65. GRB 260809A: SVOM/ECLAIRs refined analysis
  66. GRB 260822A: SVOM/VT optical upper limits
  67. GRB 260825A: Fermi GBM Final Real-time Localization
  68. IceCube-260825A - IceCube observation of a high-energy neutrino candidate track-like event
  69. GRB 260822A: PRIME near-infrared upper limits from multiple epochs
  70. GRB 260822A: EP/FXT follow-up observations
  71. GRB 260822A: the candidate optical afterglow is an unrelated type-Ia SN
  72. GRB 260818A: further EP-FXT observations and X-ray afterglow confirmation
  73. GRB 260822A: Retraction of GOTO optical counterpart detection GCN 45431
  74. GRB 260822A: GOTO optical counterpart detection
  75. GRB 260822A: SVOM/VT optical detection of COLIBRÍ candidate
  76. GRB 260822A: SVOM/COLIBRÍ (FM-GFT) possible optical counterpart candidate
  77. GRB 260822A: LCO optical upper limits
  78. GRB260822B: Fermi GBM Final Localization
  79. GRB 260822A: GROWTH-India Telescope Upper Limits
  80. GRB 260822A: GOTO optical upper limit
  81. GRB 260822A: SVOM detection of a short burst
  82. Fermi-LAT Gamma-ray Observations of IceCube-260821A
  83. Fermi-LAT Gamma-ray Observations of IceCube-260807A
  84. GRB 260818B: VLA radio observations
  85. GRB 260818B: SVOM/C-GFT optical upper limit
  86. GRB 260820A: Insight-HXMT/HE detection
  87. IceCube-260821A - IceCube observation of a high-energy neutrino candidate track-like event
  88. GRB 260818B: SVOM/GRM observation
  89. GRB260820A: Fermi GBM Final Real-Time Localization
  90. GRB 260818B: Insight-HXMT detection
  91. GRB 260818B: EP-FXT follow-up observation
  92. GRB 260818A: J-band observations with WINTER
  93. GRB 260818B: SVOM/ECLAIRs refined analysis
  94. GRB 260818A: SVOM/ECLAIRs refined analysis
  95. GRB 260818B: NOT optical upper limits
  96. GRB 260810A: SVOM/GRM observation
  97. GRB 260818B: SVOM/COLIBRÍ (FM-GFT) optical upper limit
  98. GRB260818A: EP-FXT follow-up observation
  99. GRB 260818B: LCO optical upper limits
  100. GRB 260818B: SVOM detection of a short burst

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