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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"

38573 results found.

  1. GRB 260522A: Fermi GBM Final Real-time Localization
  2. GRB 260511A: iTelescope T-75 optical detection
  3. GRB 260520B: SVOM/GRM observation
  4. GRB 260411B: TERI Gamma-ray detection
  5. GRB 260407A: TERI Gamma-ray detection
  6. GRB 260307A: TERI Gamma-ray detection
  7. GRB 260225D: TERI Gamma-ray detection
  8. GRB 251118A: TERI Gamma-ray detection
  9. GRB 251113A: TERI Gamma-ray detection
  10. GRB 260428A: TERI Gamma-ray detection
  11. Konus-Wind detection of GRB 260519C
  12. GRB 260520B: Fermi GBM Final Localization
  13. GRB 260509A: SVOM/ECLAIRs refined analysis
  14. GRB 260520A: Fermi GBM Final Localization
  15. GRB 260519D: Fermi GBM Final Localization Correction
  16. GRB 260519C: NuSTAR detection of prompt emission
  17. Konus-Wind detection of GRB 260518A
  18. GRB 260519B: Fermi GBM Final Localization
  19. GRB 260519A: Fermi GBM Final Localization
  20. GRB 260518A: AstroSat CZTI detection of a long burst
  21. GRB 260516D: SVOM/ECLAIRs refined analysis
  22. GRB 260515A: SVOM/ECLAIRs refined analysis
  23. GRB 260421B: radio detection with the VLA
  24. GRID detection of GRB 260511A
  25. GRB 260509A: CrAO ZTSh optical upper limit
  26. GRB 260516D: EP-FXT follow-up observation
  27. GRB 260516D: GOTO optical counterpart detection
  28. GRB 260516D: LCO optical observations
  29. GRB 260515A: further Liverpool Telescope observations
  30. GRB 260516D: SVOM/COLIBRÍ (FM-GFT) optical observations
  31. GRB 260516D: GTC/OSIRIS+ spectroscopic redshift z = 1.801
  32. GRB 260516D: GROWTH-India Telescope optical detection
  33. GRB 260516D: SVOM/VT optical bright candidate
  34. GRB 260516D: FRAM-ORM optical limit
  35. GRB 260515A: CrAO ZTSh BVRI optical observations
  36. SVOM GRB260516D: Global MASTER-Net observations report
  37. GRB 260516D: SVOM possible detection of a burst
  38. GRB 260516C: Fermi GBM Final Real-time Localization
  39. Konus-Wind detection of GRB 260515A
  40. GRB 260515A: Liverpool Telescope optical detection
  41. GRB 260515A: LCO optical counterpart detection
  42. Fermi Gamma-ray Burst Monitor trigger 800627191/260516518 is not a GRB
  43. GRB 260515A: SVOM/COLIBRÍ (FM-GFT) optical observations
  44. GRB 260515A: EP-FXT follow-up observation
  45. EP260514a: refined analysis of the EP-WXT and follow-up EP-FXT observations
  46. EP260514a: TRT optical counterpart candidate
  47. EP260514a: SVOM/VT optical candidate
  48. GRB 260516B: Fermi GBM Final Real-time Localization
  49. Fermi Gamma-ray Burst Monitor trigger 800592653/260516119 is not a GRB
  50. GRB 260515A: SVOM/VT optical observations
  51. GRB 260515A: OHP/T193 optical observations
  52. EP260514a: COLIBRÍ optical upper limits
  53. GRB 260516A: Fermi GBM Final Real-time Localization
  54. GRID detection of GRB 260507A
  55. GRB 260515A: GTC/OSIRIS+ spectroscopic redshift z = 0.764
  56. GRB 260515A: LCO optical observations
  57. SVOM GRB 260515A: Global MASTER-Net observations report
  58. GRB 260515A: NOT optical observations.
  59. SVOM GRB 260515A: MASTER OT J151044.43+243321.7 optical counterpart detection
  60. GRB 260515A: SVOM/VT optical candidate from VHF data
  61. GRB 260515A: JinShan optical counterpart candidate
  62. GRB 260515A: SVOM detection of a burst
  63. GRB 260510C: Glowbug gamma-ray detection
  64. IceCube-260504A: No Candidate Transients from the Zwicky Transient Facility
  65. EP260514a: GROWTH-India Telescope optical upper limit
  66. GRB 260511B: NOT optical observations
  67. Konus-Wind detection of GRB 260512A
  68. GRB 260510C: CALET Gamma-Ray Burst Monitor detection
  69. GRB 260511B: GMG Optical Upper Limit
  70. EP260514a: Einstein Probe detection of a fast X-ray transient
  71. EP260512a: LCO optical upper limits
  72. IPN triangulation of GRB 260512A
  73. GRB 260511B: Mephisto multi-band optical followup
  74. GRB 260512A: AstroSat CZTI detection
  75. The EP-WXT trigger 01709262077 is likely a flaring star
  76. EP260512a: EP-FXT follow-up observation
  77. GRB 260514A: Fermi GBM Final Real-time Localization
  78. GRB 260511B: further SAO RAS optical observations
  79. GRB 260513A: Fermi GBM Final Real-time Localization
  80. GRB 260509A: SVOM/VT optical observations
  81. Konus-Wind detection of GRB 260511B
  82. The EP-WXT trigger 01709262036 is likely a flaring star
  83. EP260512a: COLIBRÍ optical upper limits
  84. EP260512a: Einstein Probe detection of an X-ray transient
  85. GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
  86. GRB 260511B: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
  87. GRB 260512A: NuSTAR detection of prompt emission
  88. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  89. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  90. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  91. GRB 260512A: Fermi GBM Final Real-time Localization
  92. GRB 260511A: Glowbug gamma-ray detection
  93. Konus-Wind detection of GRB 260511A
  94. MASS-Cube (GRID 2.0) detection of GRB 260511A
  95. MASS-Cube (GRID 2.0) detection of GRB 260507A
  96. GRB 260511B: SAO RAS optical observations
  97. GRB 260510D: Glowbug gamma-ray detection of a likely short burst
  98. GRB 260511B: FRAM-ORM optical detection
  99. GRB 260511A: EP-FXT follow-up observation
  100. GRB 260511B: EP-FXT follow-up observation

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