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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"

28228 results found.

  1. SVOM GRB 260515A: Global MASTER-Net observations report
  2. SVOM GRB 260515A: MASTER OT J151044.43+243321.7 optical counterpart detection
  3. GRB 260515A: SVOM/VT optical candidate from VHF data
  4. GRB 260515A: JinShan optical counterpart candidate
  5. GRB 260515A: SVOM detection of a burst
  6. GRB 260510C: Glowbug gamma-ray detection
  7. EP260514a: GROWTH-India Telescope optical upper limit
  8. GRB 260511B: GMG Optical Upper Limit
  9. EP260514a: Global MASTER-Net observations report
  10. EP260514a: Einstein Probe detection of a fast X-ray transient
  11. EP260512a: LCO optical upper limits
  12. GRB 260511B: Mephisto multi-band optical followup
  13. Fermi GRB 260514A: Global MASTER-Net observations report
  14. GRB 260512A: AstroSat CZTI detection
  15. EP260512a: EP-FXT follow-up observation
  16. EP260507a: Xinglong Schmidt optical counterpart detection
  17. EP260512a: Global MASTER-Net observations report
  18. Fermi GRB 260513A: Global MASTER-Net observations report
  19. Fermi GRB 260512A: Global MASTER-Net observations report
  20. GRB 260511B: further SAO RAS optical observations
  21. GRB 260509A: SVOM/VT optical observations
  22. The EP-WXT trigger 01709262036 is likely a flaring star
  23. EP260512a: COLIBRÍ optical upper limits
  24. EP260512a: Einstein Probe detection of an X-ray transient
  25. GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
  26. GRB 260511B: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
  27. GRB 260512A: NuSTAR detection of prompt emission
  28. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  29. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  30. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  31. GRB 260511A: Glowbug gamma-ray detection
  32. GRB 260511B: SAO RAS optical observations
  33. GRB 260510D: Glowbug gamma-ray detection of a likely short burst
  34. GRB 260511B: FRAM-ORM optical detection
  35. GRB 260511A: EP-FXT follow-up observation
  36. GRB 260511B: EP-FXT follow-up observation
  37. GRB 260511B: LCO optical counterpart detection
  38. GRB260511B: MAO/AZT-22 optical observations
  39. GRB 260511B: LCO optical observations
  40. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) further optical observations
  41. GRB 260511B: SVOM/COLIBRÍ (FM-GFT) optical observations
  42. GRB 260510B: EP-FXT follow-up observation
  43. GRB 260510C: Fermi GBM Observation
  44. GRB 260509A: SAO RAS optical observations
  45. GRB 260511A: REM near-infrared detection
  46. GRB 260511B: GROWTH-India Telescope optical observations
  47. GRB 260506B: Glowbug gamma-ray detection
  48. GRB 260506A: Glowbug gamma-ray detection of a short burst
  49. GRB 260511B: J-band observations by the SYSU 80 cm infrared telescope
  50. GRB 260511B: NuSTAR detection of prompt emission
  51. GRB 260511A: NuSTAR detection of prompt emission
  52. GRB 260511B: Fermi GBM Detection
  53. GRB 260511B: SVOM/VT optical observation with VHF data
  54. GRB 260511B: TRT optical observation
  55. GRB 260511B : MITSuME Akeno optical afterglow candidate detection
  56. GRB 260511A: Fermi GBM Detection
  57. GRB 260511B SVOM/C-GFT optical counterpart detection
  58. EP260509a: LCO optical upper limits
  59. GRB 260511A: UTGO H50 optical afterglow observation
  60. GRB 260511B: SVOM detection of a burst
  61. GRB 260510C: EP-FXT follow-up observation
  62. EP260509a: EP-FXT non-detection and upper limit
  63. GRB 260511A: SVOM/VT optical observation with VHF data
  64. Fermi GRB 260511A: Global MASTER-Net observations report
  65. GRB 260511A: KAIT optical afterglow observations
  66. GRB 260511A: LCO optical afterglow detection
  67. GRB 260511A: SVOM/COLIBRÍ (FM-GFT) optical counterpart
  68. GRB 260511A: TRT optical counterpart detection
  69. GRB 260511A: SVOM detection of a bright burst
  70. GRB 260511A: BALROG localization (Fermi Trigger 800172815 / GRB 260511259)
  71. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  72. GRB 260510C: MAXI/GSC detection
  73. EP260509a: Global MASTER-Net observations report
  74. Fermi GBM Sub-Threshold Detection of GRB 260510B
  75. GRB 260510C: SVOM detection of a burst
  76. GRB 260510B: LCO optical upper limits
  77. EP260509a: Einstein Probe detection of an X-ray transient
  78. GRB 260509A: Liverpool Telescope optical observations
  79. GRB 260510B: SVOM detection of a burst
  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 260509A: SVOM/VT optical candidate with VHF data
  86. GRB 260509A: LCO optical counterpart detection
  87. GRB 260509A: SVOM detection of a burst
  88. IceCube-260504A: Upper limits from a search for additional neutrino events in IceCube
  89. EP260507a: REM optical/NIR observations
  90. EP260507a: refined analysis of the EP-WXT and EP-FXT observations
  91. GRB 260507B / EP260507a: Fermi-GBM Sub-Threshold Detection
  92. EP260507a: COLIBRÍ optical observations
  93. EP260507a: NOT optical observations
  94. EP260507a: further Liverpool Telescope observations
  95. EP260507a: Liverpool Telescope optical upper limits
  96. EP260507a: TRT optical counterpart detection
  97. EP260507a: Kinder optical counterpart candidate
  98. EP260507a: LCO optical counterpart
  99. EP260507a: Einstein Probe detection of an X-ray transient
  100. GRB 260506B: BALROG localization (Fermi Trigger 799765648 / GRB 260506547)

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