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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"

14931 results found.

  1. IceCube-231125A - IceCube observation of a high-energy neutrino candidate track-like event
  2. GRB 231125A: AstroSat CZTI detection of a short burst
  3. GRB 231126A: Fermi GBM Final Real-time Localization
  4. GRB 231123C: Insight-HXMT/HE detection
  5. GRB 231123C (short): Glowbug gamma-ray detection
  6. GRB 231124A: Glowbug gamma-ray detection
  7. GRB230728A: VIRT optical upper limit
  8. GRB 231123C: Swift/BAT-GUANO detection of a short burst likely outside the coded FOV
  9. GRB 231124A: CALET Gamma-Ray Burst Monitor detection
  10. GRB 231115A: XMM-Newton observation
  11. GRB 231124A: Fermi GBM Final Real-time Localization
  12. GRB 231123A: AstroSat CZTI detection
  13. GRB 231123C: Fermi GBM Final Real-time Localization
  14. GRB 231123B: Fermi GBM Final Real-time Localization
  15. GRB 231118A: REM optical afterglow detection
  16. GRB 231122B: AstroSat CZTI detection
  17. GRB 231122B: CALET Gamma-Ray Burst Monitor detection
  18. GRB 231122B: Swift/BAT-GUANO detection of a long burst outside the coded FOV
  19. GRB 231117A: Chandra afterglow detection
  20. GRB 231123A: Fermi GBM Final Real-time Localization
  21. GRB 231122B: Glowbug gamma-ray detection
  22. GRB 231122A: GECAM detection
  23. GRB 231122B: GECAM detection
  24. GRB 231122A: Fermi GBM Final Real-time Localization
  25. GRB 231118A: ATCA detection of radio counterpart
  26. GRB 231118A: GRBAlpha detection
  27. GRB 231118A: VZLUSAT-2 detection
  28. Konus-Wind detection of GRB 231020A
  29. GRB 231118B: CALET Gamma-Ray Burst Monitor detection
  30. GRB 231117A: CALET Gamma-Ray Burst Monitor detection
  31. 231118A: Swift-UVOT Detection
  32. GRB231117A: Swift-UVOT detection
  33. GRB 231117A : MITSuME Akeno optical afterglow candidate detection
  34. GRB 231120A: Fermi GBM Final Real-time Localization
  35. GRB 231118A: MeerLICHT afterglow detection
  36. GRB 231118A: VLT/X-shooter redshift
  37. GRB 231117A: MAAO 0.7-m telescope optical upper limit
  38. GRB 231117A: GECAM-C detection
  39. GRB 231118A: AstroSat CZTI detection
  40. GRB 231115A: Upper limit from CALET Gamma-Ray Burst Monitor
  41. GRB 231117A: 10 GHz VLA detection
  42. GRB 231118A: Las Cumbres optical detection
  43. GRB 231118B: Fermi GBM Final Real-time Localization
  44. GRB 231118A: Continued Skynet Observations
  45. GRB 231117A: Kinder observations with Lulin observatory for AT 2023yba without fading in r band
  46. GRB 231118A: Swift detection of a burst
  47. GRB 231118A: Fermi GBM Final Real-time Localization
  48. GRB 231117A: ATCA detection of a radio counterpart
  49. GRB 231117A: GRBAlpha detection
  50. GRB 231117A: afterglow candidate detection from Kinder observations with Lulin observatory
  51. GRB 231117A (short): Glowbug gamma-ray detection
  52. GRB 231117A: ATLAS non-detection of an optical counterpart
  53. Konus-Wind detection of GRB 231117A (short/hard)
  54. GRB 231115A: optical observations from INAF observatories
  55. GRB 231117A: AGILE detection of a bright short burst
  56. GRB 231117A: AstroSat CZTI detection of a bright short burst
  57. GRB 231117A: Swift detection of a bright short burst
  58. GRB 231115A: Non-detection of radio emission with CHIME/FRB
  59. GRB 231111A: Swift/UVOT Detection
  60. MAGIC observation of GRB 231115A, a possible magnetar giant flare
  61. GRB 231115A: Swift/BAT-GUANO detection of a short burst
  62. GRB 231115A: Swift-XRT and Swift-UVOT observations
  63. Konus-Wind detection of GRB 231115A (a probable Magnetar Giant Flare from M82)
  64. GRB 231115A: Insight-HXMT/HE detection
  65. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  66. GRB 231116A: Fermi GBM Final Real-time Localization
  67. GRB 231115A / AT2023xvj: Updated GIT analysis
  68. GRB231115A: GRANDMA Observations
  69. GRB 231115A: Non-detection in low-latency of gravitational waves with LIGO/Virgo/KAGRA
  70. GRB 231106A: TESS identification of candidate optical counterpart
  71. GRB 231115A (short): Glowbug gamma-ray detection
  72. GRB 231115A: Fermi GBM Final Real-time Localization
  73. LIGO/Virgo/KAGRA S231113bw: Zwicky Transient Facility observations
  74. GRB 231113A (short): Glowbug gamma-ray detection
  75. GRB 231114A (short): Glowbug gamma-ray detection
  76. GRB 231114A: Fermi GBM Final Localization
  77. LIGO/Virgo/KAGRA S231113bw: Upper limits from Fermi-GBM Observations
  78. GRB 231110A: CALET Gamma-Ray Burst Monitor detection
  79. GRB231111A: MDM 2.4m Hiltner Telescope Observation
  80. GRB 231106A: Glowbug gamma-ray detection
  81. GRB 231111A: Afterglow redshift from OSIRIS+/GTC
  82. GRB 231104A: VZLUSAT-2 detection
  83. GRB 231111A: TNG tentative redshift
  84. GRB 231110A: Glowbug gamma-ray detection
  85. GRB 231110A: AstroSat CZTI detection
  86. GRB231111A: Optical follow-up observations with Mephisto
  87. GRB 231106B: GRBAlpha detection
  88. GRB 231111A: Osservatorio Astronomico "Nastro Verde" optical observations with detection of an optical counterpart
  89. GRB 231110A: Terskol Zeiss-2000 optical upper limit
  90. GRB 231111A: GECAM-C detection of a long burst (correction)
  91. GRB 231110A: GECAM-B detection (correction)
  92. GRB 231111A: GECAM-C detection of a long burst
  93. GRB 231110A: GECAM detection
  94. GRB 231110A: SAO RAS optical observations
  95. GRB 231110A: Swift-XRT afterglow detection
  96. GRB231111A: YAHPT Observations
  97. GRB231111A: GIT confirmation of the optical afterglow
  98. GRB 231111A: MASTER OT earlier detection
  99. GRB 231111A: Swift detection of a burst with an optical counterpart
  100. GRB231110A: WFST Observation and upper limits

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