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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"

28234 results found.

  1. Fermi GRB 260516B: Global MASTER-Net observations report
  2. GRB 260515A: OHP/T193 optical observations
  3. EP260514a: COLIBRÍ optical upper limits
  4. GRB 260515A: LCO optical observations
  5. SVOM GRB 260515A: Global MASTER-Net observations report
  6. SVOM GRB 260515A: MASTER OT J151044.43+243321.7 optical counterpart detection
  7. GRB 260515A: SVOM/VT optical candidate from VHF data
  8. GRB 260515A: JinShan optical counterpart candidate
  9. GRB 260515A: SVOM detection of a burst
  10. GRB 260510C: Glowbug gamma-ray detection
  11. EP260514a: GROWTH-India Telescope optical upper limit
  12. GRB 260511B: GMG Optical Upper Limit
  13. EP260514a: Global MASTER-Net observations report
  14. EP260514a: Einstein Probe detection of a fast X-ray transient
  15. EP260512a: LCO optical upper limits
  16. GRB 260511B: Mephisto multi-band optical followup
  17. Fermi GRB 260514A: Global MASTER-Net observations report
  18. GRB 260512A: AstroSat CZTI detection
  19. EP260512a: EP-FXT follow-up observation
  20. EP260507a: Xinglong Schmidt optical counterpart detection
  21. EP260512a: Global MASTER-Net observations report
  22. Fermi GRB 260513A: Global MASTER-Net observations report
  23. Fermi GRB 260512A: Global MASTER-Net observations report
  24. GRB 260511B: further SAO RAS optical observations
  25. GRB 260509A: SVOM/VT optical observations
  26. The EP-WXT trigger 01709262036 is likely a flaring star
  27. EP260512a: COLIBRÍ optical upper limits
  28. EP260512a: Einstein Probe detection of an X-ray transient
  29. GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
  30. GRB 260511B: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
  31. GRB 260512A: NuSTAR detection of prompt emission
  32. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  33. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  34. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  35. GRB 260511A: Glowbug gamma-ray detection
  36. GRB 260511B: SAO RAS optical observations
  37. GRB 260510D: Glowbug gamma-ray detection of a likely short burst
  38. GRB 260511B: FRAM-ORM optical detection
  39. GRB 260511A: EP-FXT follow-up observation
  40. GRB 260511B: EP-FXT follow-up observation
  41. GRB 260511B: LCO optical counterpart detection
  42. GRB260511B: MAO/AZT-22 optical observations
  43. GRB 260511B: LCO optical observations
  44. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) further optical observations
  45. GRB 260511B: SVOM/COLIBRÍ (FM-GFT) optical observations
  46. GRB 260510B: EP-FXT follow-up observation
  47. GRB 260510C: Fermi GBM Observation
  48. GRB 260509A: SAO RAS optical observations
  49. GRB 260511A: REM near-infrared detection
  50. GRB 260511B: GROWTH-India Telescope optical observations
  51. GRB 260506B: Glowbug gamma-ray detection
  52. GRB 260506A: Glowbug gamma-ray detection of a short burst
  53. GRB 260511B: J-band observations by the SYSU 80 cm infrared telescope
  54. GRB 260511B: NuSTAR detection of prompt emission
  55. GRB 260511A: NuSTAR detection of prompt emission
  56. GRB 260511B: Fermi GBM Detection
  57. GRB 260511B: SVOM/VT optical observation with VHF data
  58. GRB 260511B: TRT optical observation
  59. GRB 260511B : MITSuME Akeno optical afterglow candidate detection
  60. GRB 260511A: Fermi GBM Detection
  61. GRB 260511B SVOM/C-GFT optical counterpart detection
  62. EP260509a: LCO optical upper limits
  63. GRB 260511A: UTGO H50 optical afterglow observation
  64. GRB 260511B: SVOM detection of a burst
  65. GRB 260510C: EP-FXT follow-up observation
  66. EP260509a: EP-FXT non-detection and upper limit
  67. GRB 260511A: SVOM/VT optical observation with VHF data
  68. Fermi GRB 260511A: Global MASTER-Net observations report
  69. GRB 260511A: KAIT optical afterglow observations
  70. GRB 260511A: LCO optical afterglow detection
  71. GRB 260511A: SVOM/COLIBRÍ (FM-GFT) optical counterpart
  72. GRB 260511A: TRT optical counterpart detection
  73. GRB 260511A: SVOM detection of a bright burst
  74. GRB 260511A: BALROG localization (Fermi Trigger 800172815 / GRB 260511259)
  75. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  76. GRB 260510C: MAXI/GSC detection
  77. EP260509a: Global MASTER-Net observations report
  78. Fermi GBM Sub-Threshold Detection of GRB 260510B
  79. GRB 260510C: SVOM detection of a burst
  80. GRB 260510B: LCO optical upper limits
  81. EP260509a: Einstein Probe detection of an X-ray transient
  82. GRB 260509A: Liverpool Telescope optical observations
  83. GRB 260510B: SVOM detection of a burst
  84. GRB 260509A: LCO optical observations
  85. SVOM GRB 260509A: MASTER-OAFA optical observation
  86. Fermi GRB 260510A: Global MASTER-Net observations report
  87. GRB 260509A: KAIT optical observations
  88. GRB 260509A: SVOM/COLIBRÍ (FM-GFT) observations
  89. GRB 260509A: SVOM/VT optical candidate with VHF data
  90. GRB 260509A: LCO optical counterpart detection
  91. GRB 260509A: SVOM detection of a burst
  92. IceCube-260504A: Upper limits from a search for additional neutrino events in IceCube
  93. EP260507a: REM optical/NIR observations
  94. EP260507a: refined analysis of the EP-WXT and EP-FXT observations
  95. GRB 260507B / EP260507a: Fermi-GBM Sub-Threshold Detection
  96. EP260507a: COLIBRÍ optical observations
  97. EP260507a: NOT optical observations
  98. EP260507a: further Liverpool Telescope observations
  99. EP260507a: Liverpool Telescope optical upper limits
  100. EP260507a: TRT optical counterpart detection

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