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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"

37674 results found.

  1. GRB 260513A: Fermi GBM Final Real-time Localization
  2. GRB 260509A: SVOM/VT optical observations
  3. Konus-Wind detection of GRB 260511B
  4. GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
  5. GRB 260511B: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
  6. GRB 260512A: NuSTAR detection of prompt emission
  7. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  8. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  9. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  10. GRB 260512A: Fermi GBM Final Real-time Localization
  11. GRB 260511A: Glowbug gamma-ray detection
  12. Konus-Wind detection of GRB 260511A
  13. MASS-Cube (GRID 2.0) detection of GRB 260511A
  14. MASS-Cube (GRID 2.0) detection of GRB 260507A
  15. GRB 260511B: SAO RAS optical observations
  16. GRB 260510D: Glowbug gamma-ray detection of a likely short burst
  17. GRB 260511B: FRAM-ORM optical detection
  18. GRB 260511A: EP-FXT follow-up observation
  19. GRB 260511B: EP-FXT follow-up observation
  20. GRB 260511B: LCO optical counterpart detection
  21. GRB260511B: MAO/AZT-22 optical observations
  22. GRB 260511A: SVOM/VT optical observations
  23. GRB 260511B: LCO optical observations
  24. GRB 260511B: OHP/T193 spectroscopic observations
  25. GRB 260511B: GOTO optical counterpart detection
  26. GRB 260511B: Xinglong 2.16m/BEFOSC redshift confirmation
  27. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) further optical observations
  28. GRB 260510A: AstroSat CZTI detection (Erroneous Submission)
  29. GRB 260511B: SVOM/VT optical observations
  30. GRB 260511B: SVOM/COLIBRÍ (FM-GFT) optical observations
  31. GRB 260510B: EP-FXT follow-up observation
  32. GRB 260511B: OSIRIS+/GTC redshift z=2.006
  33. GRB 260510C: Fermi GBM Observation
  34. GRB 260509A: SAO RAS optical observations
  35. GRB 260511A: REM near-infrared detection
  36. GRB 260511B: GROWTH-India Telescope optical observations
  37. GRB 260511B: AstroSat CZTI detection
  38. GRB 260506B: Glowbug gamma-ray detection
  39. GRB 260506A: Glowbug gamma-ray detection of a short burst
  40. GRB 260511B: J-band observations by the SYSU 80 cm infrared telescope
  41. GRB 260511B: NuSTAR detection of prompt emission
  42. GRB 260511A: NuSTAR detection of prompt emission
  43. GRB 260511B: Fermi GBM Detection
  44. GRB 260511C: Fermi GBM Final Real-time Localization
  45. GRB 260511B: SVOM/VT optical observation with VHF data
  46. GRB 260511B: TRT optical observation
  47. GRB 260510B: SVOM/ECLAIRs refined analysis
  48. GRB 260511B : MITSuME Akeno optical afterglow candidate detection
  49. GRB 260511A: Fermi GBM Detection
  50. GRB 260511B SVOM/C-GFT optical counterpart detection
  51. GRB 260511A: UTGO H50 optical afterglow observation
  52. GRB 260510C: AstroSat CZTI detection
  53. GRB 260511B: SVOM detection of a burst
  54. GRB 260511B: Fermi GBM Final Real-time Localization
  55. GRB 260510C: EP-FXT follow-up observation
  56. GRB 260510C: SVOM/VT optical counterpart confirmation
  57. GRB 260511A: SVOM/VT optical observation with VHF data
  58. Fermi GRB 260511A: Global MASTER-Net observations report
  59. GRB 260511A: KAIT optical afterglow observations
  60. GRB 260511A: LCO optical afterglow detection
  61. GRB 260511A: SVOM/COLIBRÍ (FM-GFT) optical counterpart
  62. GRB 260511A: TRT optical counterpart detection
  63. GRB 260511A: SVOM detection of a bright burst
  64. GRB 260511A: BALROG localization (Fermi Trigger 800172815 / GRB 260511259)
  65. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  66. GRB 260511A: Fermi GBM Final Real-time Localization
  67. GRB 260510B: SVOM/VT optical upper limits
  68. GRB 260510C: SVOM/VT optical upper limits
  69. GRB 260510C: MAXI/GSC detection
  70. Fermi GBM Sub-Threshold Detection of GRB 260510B
  71. GRB 260510D: Fermi GBM Final Real-time Localization
  72. GRB 260510B: GOTO early upper limit
  73. GRB 260510C: SVOM detection of a burst
  74. GRB 260510C: Fermi GBM Final Real-time Localization
  75. GRB 260510A: GECAM-B observation
  76. GRB 260510B: LCO optical upper limits
  77. GRB 260509A: Liverpool Telescope optical observations
  78. GRB 260510B: SVOM detection of a burst
  79. GRB 260509A: NOT spectroscopic redshift upper limit z < 1.95
  80. GRB 260509A: LCO optical observations
  81. SVOM GRB 260509A: MASTER-OAFA optical observation
  82. Fermi GRB 260510A: Global MASTER-Net observations report
  83. GRB 260509A: KAIT optical observations
  84. GRB 260509A: SVOM/COLIBRÍ (FM-GFT) observations
  85. GRB 260510A: Fermi GBM Final Real-time Localization
  86. GRB 260509A: SVOM/VT optical candidate with VHF data
  87. GRB 260509A: LCO optical counterpart detection
  88. GRB 260509A: GOTO optical counterpart candidate
  89. GRB 260509A: SVOM detection of a burst
  90. GRB 260506B: AstroSat CZTI detection
  91. GRB 260507B / EP260507a: Fermi-GBM Sub-Threshold Detection
  92. GRB 260507A: Fermi GBM Final Real-time Localization
  93. GRB 260504B: AstroSat CZTI detection
  94. GRB 260504B: SVOM/ECLAIRs refined analysis
  95. GRB 260506B: BALROG localization (Fermi Trigger 799765648 / GRB 260506547)
  96. GRB 260506B: Fermi GBM Final Real-time Localization
  97. Fermi GRB 260506A: Global MASTER-Net observations report
  98. GRB 260506A: Fermi GBM Final Real-time Localization
  99. GRB 260503A: GECAM-B observation of a burst
  100. GRB 260430B: Glowbug gamma-ray detection

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