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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

28110 results found.

  1. Fermi GRB 260512A: Global MASTER-Net observations report
  2. GRB 260511B: further SAO RAS optical observations
  3. GRB 260509A: SVOM/VT optical observations
  4. The EP-WXT trigger 01709262036 is likely a flaring star
  5. EP260512a: COLIBRÍ optical upper limits
  6. EP260512a: Einstein Probe detection of an X-ray transient
  7. GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
  8. GRB 260511B: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
  9. GRB 260512A: NuSTAR detection of prompt emission
  10. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  11. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  12. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  13. GRB 260511A: Glowbug gamma-ray detection
  14. GRB 260511B: SAO RAS optical observations
  15. GRB 260510D: Glowbug gamma-ray detection of a likely short burst
  16. GRB 260511B: FRAM-ORM optical detection
  17. GRB 260511A: EP-FXT follow-up observation
  18. GRB 260511B: EP-FXT follow-up observation
  19. GRB 260511B: LCO optical counterpart detection
  20. GRB260511B: MAO/AZT-22 optical observations
  21. GRB 260511B: LCO optical observations
  22. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) further optical observations
  23. GRB 260511B: SVOM/COLIBRÍ (FM-GFT) optical observations
  24. GRB 260510B: EP-FXT follow-up observation
  25. GRB 260510C: Fermi GBM Observation
  26. GRB 260509A: SAO RAS optical observations
  27. GRB 260511A: REM near-infrared detection
  28. GRB 260511B: GROWTH-India Telescope optical observations
  29. GRB 260506B: Glowbug gamma-ray detection
  30. GRB 260506A: Glowbug gamma-ray detection of a short burst
  31. GRB 260511B: J-band observations by the SYSU 80 cm infrared telescope
  32. GRB 260511B: NuSTAR detection of prompt emission
  33. GRB 260511A: NuSTAR detection of prompt emission
  34. GRB 260511B: Fermi GBM Detection
  35. GRB 260511B: SVOM/VT optical observation with VHF data
  36. GRB 260511B: TRT optical observation
  37. GRB 260511B : MITSuME Akeno optical afterglow candidate detection
  38. GRB 260511A: Fermi GBM Detection
  39. GRB 260511B SVOM/C-GFT optical counterpart detection
  40. EP260509a: LCO optical upper limits
  41. GRB 260511A: UTGO H50 optical afterglow observation
  42. GRB 260511B: SVOM detection of a burst
  43. GRB 260510C: EP-FXT follow-up observation
  44. EP260509a: EP-FXT non-detection and upper limit
  45. GRB 260511A: SVOM/VT optical observation with VHF data
  46. Fermi GRB 260511A: Global MASTER-Net observations report
  47. GRB 260511A: KAIT optical afterglow observations
  48. GRB 260511A: LCO optical afterglow detection
  49. GRB 260511A: SVOM/COLIBRÍ (FM-GFT) optical counterpart
  50. GRB 260511A: TRT optical counterpart detection
  51. GRB 260511A: SVOM detection of a bright burst
  52. GRB 260511A: BALROG localization (Fermi Trigger 800172815 / GRB 260511259)
  53. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  54. GRB 260510C: MAXI/GSC detection
  55. EP260509a: Global MASTER-Net observations report
  56. Fermi GBM Sub-Threshold Detection of GRB 260510B
  57. GRB 260510C: SVOM detection of a burst
  58. GRB 260510B: LCO optical upper limits
  59. EP260509a: Einstein Probe detection of an X-ray transient
  60. GRB 260509A: Liverpool Telescope optical observations
  61. GRB 260510B: SVOM detection of a burst
  62. GRB 260509A: LCO optical observations
  63. SVOM GRB 260509A: MASTER-OAFA optical observation
  64. Fermi GRB 260510A: Global MASTER-Net observations report
  65. GRB 260509A: KAIT optical observations
  66. GRB 260509A: SVOM/COLIBRÍ (FM-GFT) observations
  67. GRB 260509A: SVOM/VT optical candidate with VHF data
  68. GRB 260509A: LCO optical counterpart detection
  69. GRB 260509A: SVOM detection of a burst
  70. IceCube-260504A: Upper limits from a search for additional neutrino events in IceCube
  71. EP260507a: REM optical/NIR observations
  72. EP260507a: refined analysis of the EP-WXT and EP-FXT observations
  73. GRB 260507B / EP260507a: Fermi-GBM Sub-Threshold Detection
  74. EP260507a: COLIBRÍ optical observations
  75. EP260507a: NOT optical observations
  76. EP260507a: further Liverpool Telescope observations
  77. EP260507a: Liverpool Telescope optical upper limits
  78. EP260507a: TRT optical counterpart detection
  79. EP260507a: Kinder optical counterpart candidate
  80. EP260507a: LCO optical counterpart
  81. EP260507a: Einstein Probe detection of an X-ray transient
  82. GRB 260506B: BALROG localization (Fermi Trigger 799765648 / GRB 260506547)
  83. Fermi GRB 260506A: Global MASTER-Net observations report
  84. IceCube Alert 260505A: Global MASTER-Net observations report
  85. GRB 260430B: Glowbug gamma-ray detection
  86. GRB 260421B: radio observation with the VLA
  87. Fermi-LAT Gamma-ray Observations of IceCube-260504A
  88. GRB 260430B: AstroSat CZTI detection of a long burst
  89. GRB 260502A: SVOM/GRM observation of a short GRB
  90. GRB 260503A: SVOM/GRM observation of a GRB
  91. Konus-Wind detection of GRB 260411C
  92. GRB 260504B: REM optical/NIR observations
  93. GRB 260504B: LCO z-band upper limit
  94. SVOM GRB 260504B: MASTER-OAFA optical observations
  95. GRB 260504B: SVOM detection of a short burst
  96. Fermi GRB 260504A: Global MASTER-Net observations report
  97. SVOM/GRM observation of a bright burst from SGR 1E1841-045
  98. GRB 260429B / EP260429a: EP-FXT follow-up observation
  99. EP260502a: Einstein Probe detection of an X-ray transient
  100. GRB 260429A: SVOM/GRM observation of a short burst

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