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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"

45718 results found.

  1. GRB 260516D: LCO optical observations
  2. GRB 260515A: further Liverpool Telescope observations
  3. GRB 260516D: SVOM/COLIBRÍ (FM-GFT) optical observations
  4. GRB 260516D: GTC/OSIRIS+ spectroscopic redshift z = 1.801
  5. GRB 260516D: GROWTH-India Telescope optical detection
  6. GRB 260516D: SVOM/VT optical bright candidate
  7. GRB 260516D: FRAM-ORM optical limit
  8. GRB 260515A: CrAO ZTSh BVRI optical observations
  9. Fermi GRB 260516C: Global MASTER-Net observations report
  10. SVOM GRB260516D: Global MASTER-Net observations report
  11. GRB 260516D: SVOM possible detection of a burst
  12. GRB 260516C: Fermi GBM Final Real-time Localization
  13. Konus-Wind detection of GRB 260515A
  14. GRB 260515A: Liverpool Telescope optical detection
  15. GRB 260515A: LCO optical counterpart detection
  16. Fermi Gamma-ray Burst Monitor trigger 800627191/260516518 is not a GRB
  17. GRB 260515A: SVOM/COLIBRÍ (FM-GFT) optical observations
  18. GRB 260515A: EP-FXT follow-up observation
  19. EP260514a: refined analysis of the EP-WXT and follow-up EP-FXT observations
  20. EP260514a: NOT optical counterpart confirmation
  21. EP260514a: TRT optical counterpart candidate
  22. EP260514a: SVOM/VT optical candidate
  23. Fermi GRB 260516B: Global MASTER-Net observations report
  24. GRB 260516B: Fermi GBM Final Real-time Localization
  25. Fermi Gamma-ray Burst Monitor trigger 800592653/260516119 is not a GRB
  26. GRB 260515A: SVOM/VT optical observations
  27. GRB 260515A: OHP/T193 optical observations
  28. EP260514a: COLIBRÍ optical upper limits
  29. GRB 260516A: Fermi GBM Final Real-time Localization
  30. GRID detection of GRB 260507A
  31. GRB 260515A: GTC/OSIRIS+ spectroscopic redshift z = 0.764
  32. GRB 260515A: LCO optical observations
  33. SVOM GRB 260515A: Global MASTER-Net observations report
  34. GRB 260515A: NOT optical observations.
  35. SVOM GRB 260515A: MASTER OT J151044.43+243321.7 optical counterpart detection
  36. GRB 260515A: SVOM/VT optical candidate from VHF data
  37. GRB 260515A: JinShan optical counterpart candidate
  38. GRB 260515A: SVOM detection of a burst
  39. GRB 260510C: Glowbug gamma-ray detection
  40. IceCube-260504A: No Candidate Transients from the Zwicky Transient Facility
  41. EP260514a: GROWTH-India Telescope optical upper limit
  42. GRB 260511B: NOT optical observations
  43. Konus-Wind detection of GRB 260512A
  44. GRB 260510C: CALET Gamma-Ray Burst Monitor detection
  45. GRB 260511B: GMG Optical Upper Limit
  46. EP260514a: Global MASTER-Net observations report
  47. EP260514a: Einstein Probe detection of a fast X-ray transient
  48. EP260512a: LCO optical upper limits
  49. IPN triangulation of GRB 260512A
  50. GRB 260511B: Mephisto multi-band optical followup
  51. Fermi GRB 260514A: Global MASTER-Net observations report
  52. GRB 260512A: AstroSat CZTI detection
  53. The EP-WXT trigger 01709262077 is likely a flaring star
  54. EP260512a: EP-FXT follow-up observation
  55. EP260507a: Xinglong Schmidt optical counterpart detection
  56. GRB 260514A: Fermi GBM Final Real-time Localization
  57. EP260512a: Global MASTER-Net observations report
  58. Fermi GRB 260513A: Global MASTER-Net observations report
  59. Fermi GRB 260512A: Global MASTER-Net observations report
  60. GRB 260511B: further SAO RAS optical observations
  61. GRB 260513A: Fermi GBM Final Real-time Localization
  62. GRB 260509A: SVOM/VT optical observations
  63. Konus-Wind detection of GRB 260511B
  64. The EP-WXT trigger 01709262036 is likely a flaring star
  65. EP260512a: COLIBRÍ optical upper limits
  66. EP260512a: Einstein Probe detection of an X-ray transient
  67. GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
  68. GRB 260511B: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
  69. GRB 260512A: NuSTAR detection of prompt emission
  70. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  71. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  72. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  73. GRB 260512A: Fermi GBM Final Real-time Localization
  74. GRB 260511A: Glowbug gamma-ray detection
  75. Konus-Wind detection of GRB 260511A
  76. MASS-Cube (GRID 2.0) detection of GRB 260511A
  77. MASS-Cube (GRID 2.0) detection of GRB 260507A
  78. GRB 260511B: SAO RAS optical observations
  79. GRB 260510D: Glowbug gamma-ray detection of a likely short burst
  80. GRB 260511B: FRAM-ORM optical detection
  81. GRB 260511A: EP-FXT follow-up observation
  82. GRB 260511B: EP-FXT follow-up observation
  83. GRB 260511B: LCO optical counterpart detection
  84. GRB260511B: MAO/AZT-22 optical observations
  85. GRB 260511A: SVOM/VT optical observations
  86. GRB 260511B: LCO optical observations
  87. GRB 260511B: OHP/T193 spectroscopic observations
  88. GRB 260511B: GOTO optical counterpart detection
  89. GRB 260511B: Xinglong 2.16m/BEFOSC redshift confirmation
  90. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) further optical observations
  91. GRB 260511B: SVOM/VT optical observations
  92. GRB 260511B: SVOM/COLIBRÍ (FM-GFT) optical observations
  93. GRB 260510B: EP-FXT follow-up observation
  94. GRB 260511B: OSIRIS+/GTC redshift z=2.006
  95. GRB 260510C: Fermi GBM Observation
  96. GRB 260509A: SAO RAS optical observations
  97. GRB 260511A: REM near-infrared detection
  98. GRB 260511B: GROWTH-India Telescope optical observations
  99. GRB 260511B: AstroSat CZTI detection
  100. GRB 260506B: Glowbug gamma-ray detection

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