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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.

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

28125 results found.

  1. GRB 260510C: Glowbug gamma-ray detection
  2. EP260514a: GROWTH-India Telescope optical upper limit
  3. GRB 260511B: GMG Optical Upper Limit
  4. EP260514a: Global MASTER-Net observations report
  5. EP260514a: Einstein Probe detection of a fast X-ray transient
  6. EP260512a: LCO optical upper limits
  7. GRB 260511B: Mephisto multi-band optical followup
  8. Fermi GRB 260514A: Global MASTER-Net observations report
  9. GRB 260512A: AstroSat CZTI detection
  10. EP260512a: EP-FXT follow-up observation
  11. EP260507a: Xinglong Schmidt optical counterpart detection
  12. EP260512a: Global MASTER-Net observations report
  13. Fermi GRB 260513A: Global MASTER-Net observations report
  14. Fermi GRB 260512A: Global MASTER-Net observations report
  15. GRB 260511B: further SAO RAS optical observations
  16. GRB 260509A: SVOM/VT optical observations
  17. The EP-WXT trigger 01709262036 is likely a flaring star
  18. EP260512a: COLIBRÍ optical upper limits
  19. EP260512a: Einstein Probe detection of an X-ray transient
  20. GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
  21. GRB 260511B: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
  22. GRB 260512A: NuSTAR detection of prompt emission
  23. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  24. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  25. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  26. GRB 260511A: Glowbug gamma-ray detection
  27. GRB 260511B: SAO RAS optical observations
  28. GRB 260510D: Glowbug gamma-ray detection of a likely short burst
  29. GRB 260511B: FRAM-ORM optical detection
  30. GRB 260511A: EP-FXT follow-up observation
  31. GRB 260511B: EP-FXT follow-up observation
  32. GRB 260511B: LCO optical counterpart detection
  33. GRB260511B: MAO/AZT-22 optical observations
  34. GRB 260511B: LCO optical observations
  35. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) further optical observations
  36. GRB 260511B: SVOM/COLIBRÍ (FM-GFT) optical observations
  37. GRB 260510B: EP-FXT follow-up observation
  38. GRB 260510C: Fermi GBM Observation
  39. GRB 260509A: SAO RAS optical observations
  40. GRB 260511A: REM near-infrared detection
  41. GRB 260511B: GROWTH-India Telescope optical observations
  42. GRB 260506B: Glowbug gamma-ray detection
  43. GRB 260506A: Glowbug gamma-ray detection of a short burst
  44. GRB 260511B: J-band observations by the SYSU 80 cm infrared telescope
  45. GRB 260511B: NuSTAR detection of prompt emission
  46. GRB 260511A: NuSTAR detection of prompt emission
  47. GRB 260511B: Fermi GBM Detection
  48. GRB 260511B: SVOM/VT optical observation with VHF data
  49. GRB 260511B: TRT optical observation
  50. GRB 260511B : MITSuME Akeno optical afterglow candidate detection
  51. GRB 260511A: Fermi GBM Detection
  52. GRB 260511B SVOM/C-GFT optical counterpart detection
  53. EP260509a: LCO optical upper limits
  54. GRB 260511A: UTGO H50 optical afterglow observation
  55. GRB 260511B: SVOM detection of a burst
  56. GRB 260510C: EP-FXT follow-up observation
  57. EP260509a: EP-FXT non-detection and upper limit
  58. GRB 260511A: SVOM/VT optical observation with VHF data
  59. Fermi GRB 260511A: Global MASTER-Net observations report
  60. GRB 260511A: KAIT optical afterglow observations
  61. GRB 260511A: LCO optical afterglow detection
  62. GRB 260511A: SVOM/COLIBRÍ (FM-GFT) optical counterpart
  63. GRB 260511A: TRT optical counterpart detection
  64. GRB 260511A: SVOM detection of a bright burst
  65. GRB 260511A: BALROG localization (Fermi Trigger 800172815 / GRB 260511259)
  66. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  67. GRB 260510C: MAXI/GSC detection
  68. EP260509a: Global MASTER-Net observations report
  69. Fermi GBM Sub-Threshold Detection of GRB 260510B
  70. GRB 260510C: SVOM detection of a burst
  71. GRB 260510B: LCO optical upper limits
  72. EP260509a: Einstein Probe detection of an X-ray transient
  73. GRB 260509A: Liverpool Telescope optical observations
  74. GRB 260510B: SVOM detection of a burst
  75. GRB 260509A: LCO optical observations
  76. SVOM GRB 260509A: MASTER-OAFA optical observation
  77. Fermi GRB 260510A: Global MASTER-Net observations report
  78. GRB 260509A: KAIT optical observations
  79. GRB 260509A: SVOM/COLIBRÍ (FM-GFT) observations
  80. GRB 260509A: SVOM/VT optical candidate with VHF data
  81. GRB 260509A: LCO optical counterpart detection
  82. GRB 260509A: SVOM detection of a burst
  83. IceCube-260504A: Upper limits from a search for additional neutrino events in IceCube
  84. EP260507a: REM optical/NIR observations
  85. EP260507a: refined analysis of the EP-WXT and EP-FXT observations
  86. GRB 260507B / EP260507a: Fermi-GBM Sub-Threshold Detection
  87. EP260507a: COLIBRÍ optical observations
  88. EP260507a: NOT optical observations
  89. EP260507a: further Liverpool Telescope observations
  90. EP260507a: Liverpool Telescope optical upper limits
  91. EP260507a: TRT optical counterpart detection
  92. EP260507a: Kinder optical counterpart candidate
  93. EP260507a: LCO optical counterpart
  94. EP260507a: Einstein Probe detection of an X-ray transient
  95. GRB 260506B: BALROG localization (Fermi Trigger 799765648 / GRB 260506547)
  96. Fermi GRB 260506A: Global MASTER-Net observations report
  97. IceCube Alert 260505A: Global MASTER-Net observations report
  98. GRB 260430B: Glowbug gamma-ray detection
  99. GRB 260421B: radio observation with the VLA
  100. Fermi-LAT Gamma-ray Observations of IceCube-260504A

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