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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"

42849 results found.

  1. GRB 260514A: Fermi GBM Final Real-time Localization
  2. EP260512a: Global MASTER-Net observations report
  3. Fermi GRB 260513A: Global MASTER-Net observations report
  4. Fermi GRB 260512A: Global MASTER-Net observations report
  5. GRB 260511B: further SAO RAS optical observations
  6. GRB 260513A: Fermi GBM Final Real-time Localization
  7. GRB 260509A: SVOM/VT optical observations
  8. Konus-Wind detection of GRB 260511B
  9. The EP-WXT trigger 01709262036 is likely a flaring star
  10. EP260512a: Einstein Probe detection of an X-ray transient
  11. GRB 260512A: NuSTAR detection of prompt emission
  12. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  13. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  14. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  15. GRB 260512A: Fermi GBM Final Real-time Localization
  16. GRB 260511A: Glowbug gamma-ray detection
  17. Konus-Wind detection of GRB 260511A
  18. MASS-Cube (GRID 2.0) detection of GRB 260511A
  19. MASS-Cube (GRID 2.0) detection of GRB 260507A
  20. GRB 260511B: SAO RAS optical observations
  21. GRB 260510D: Glowbug gamma-ray detection of a likely short burst
  22. GRB 260511B: FRAM-ORM optical detection
  23. GRB 260511A: EP-FXT follow-up observation
  24. GRB 260511B: EP-FXT follow-up observation
  25. GRB 260511B: LCO optical counterpart detection
  26. GRB260511B: MAO/AZT-22 optical observations
  27. GRB 260511A: SVOM/VT optical observations
  28. GRB 260511B: LCO optical observations
  29. GRB 260511B: OHP/T193 spectroscopic observations
  30. GRB 260511B: GOTO optical counterpart detection
  31. GRB 260511B: Xinglong 2.16m/BEFOSC redshift confirmation
  32. GRB 260511B: SVOM/VT optical observations
  33. GRB 260511B: SVOM/COLIBRÍ (FM-GFT) optical observations
  34. GRB 260510B: EP-FXT follow-up observation
  35. GRB 260511B: OSIRIS+/GTC redshift z=2.006
  36. GRB 260510C: Fermi GBM Observation
  37. GRB 260509A: SAO RAS optical observations
  38. GRB 260511A: REM near-infrared detection
  39. GRB 260511B: GROWTH-India Telescope optical observations
  40. GRB 260511B: AstroSat CZTI detection
  41. GRB 260506B: Glowbug gamma-ray detection
  42. GRB 260506A: Glowbug gamma-ray detection of a short burst
  43. GRB 260511B: J-band observations by the SYSU 80 cm infrared telescope
  44. GRB 260511B: NuSTAR detection of prompt emission
  45. GRB 260511A: NuSTAR detection of prompt emission
  46. GRB 260511B: Fermi GBM Detection
  47. GRB 260511C: Fermi GBM Final Real-time Localization
  48. GRB 260511B: SVOM/VT optical observation with VHF data
  49. GRB 260511B: TRT optical observation
  50. GRB 260510B: SVOM/ECLAIRs refined analysis
  51. GRB 260511B : MITSuME Akeno optical afterglow candidate detection
  52. GRB 260511A: Fermi GBM Detection
  53. GRB 260511B SVOM/C-GFT optical counterpart detection
  54. EP260509a: LCO optical upper limits
  55. GRB 260511A: UTGO H50 optical afterglow observation
  56. GRB 260510C: AstroSat CZTI detection
  57. GRB 260511B: SVOM detection of a burst
  58. GRB 260511B: Fermi GBM Final Real-time Localization
  59. GRB 260510C: EP-FXT follow-up observation
  60. GRB 260510C: SVOM/VT optical counterpart confirmation
  61. EP260509a: EP-FXT non-detection and upper limit
  62. GRB 260511A: SVOM/VT optical observation with VHF data
  63. Fermi GRB 260511A: Global MASTER-Net observations report
  64. GRB 260511A: KAIT optical afterglow observations
  65. GRB 260511A: LCO optical afterglow detection
  66. GRB 260511A: SVOM/COLIBRÍ (FM-GFT) optical counterpart
  67. GRB 260511A: TRT optical counterpart detection
  68. GRB 260511A: SVOM detection of a bright burst
  69. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  70. GRB 260511A: Fermi GBM Final Real-time Localization
  71. GRB 260510B: SVOM/VT optical upper limits
  72. GRB 260510C: SVOM/VT optical upper limits
  73. GRB 260510C: MAXI/GSC detection
  74. EP260509a: Global MASTER-Net observations report
  75. Fermi GBM Sub-Threshold Detection of GRB 260510B
  76. GRB 260510D: Fermi GBM Final Real-time Localization
  77. GRB 260510B: GOTO early upper limit
  78. GRB 260510C: SVOM detection of a burst
  79. GRB 260510C: Fermi GBM Final Real-time Localization
  80. GRB 260510A: GECAM-B observation
  81. GRB 260510B: LCO optical upper limits
  82. EP260509a: Einstein Probe detection of an X-ray transient
  83. GRB 260509A: Liverpool Telescope optical observations
  84. GRB 260510B: SVOM detection of a burst
  85. GRB 260509A: NOT spectroscopic redshift upper limit z < 1.95
  86. SVOM GRB 260509A: MASTER-OAFA optical observation
  87. Fermi GRB 260510A: Global MASTER-Net observations report
  88. GRB 260509A: KAIT optical observations
  89. GRB 260510A: Fermi GBM Final Real-time Localization
  90. GRB 260509A: SVOM/VT optical candidate with VHF data
  91. GRB 260509A: LCO optical counterpart detection
  92. GRB 260509A: GOTO optical counterpart candidate
  93. GRB 260509A: SVOM detection of a burst
  94. GRB 260506B: AstroSat CZTI detection
  95. IceCube-260504A: Upper limits from a search for additional neutrino events in IceCube
  96. EP260507a: REM optical/NIR observations
  97. EP260507a: refined analysis of the EP-WXT and EP-FXT observations
  98. GRB 260507B / EP260507a: Fermi-GBM Sub-Threshold Detection
  99. EP260507a: COLIBRÍ optical observations
  100. EP260507a: SVOM/VT optical observations

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