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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"

24541 results found.

  1. Fermi-LAT gamma-ray observations of IceCube-231125A
  2. Integral GRB231129.21: Global MASTER-Net observations report
  3. LIGO/Virgo/KAGRA S231129ac: Identification of a GW compact binary merger candidate
  4. GRB 231129A: GECAM-C detection of a long burst
  5. GRB 231129A: INTEGRAL detection of a long GRB
  6. GRB 231129A: Swift detection of a burst
  7. LIGO/Virgo/KAGRA S231127cg: Updated Sky localization
  8. GRB 231128A: Fermi GBM Final Real-time Localization
  9. GRB 231123C: Fermi GBM Observation
  10. GRB 231123B: Fermi GBM Observation
  11. IceCube-231125A: Upper limits from a search for additional neutrino events in IceCube
  12. LIGO/Virgo/KAGRA S231127cg: Identification of a GW compact binary merger candidate
  13. GRB 231125A: GRBAlpha detection
  14. GRB 231125A: CALET Gamma-Ray Burst Monitor detection
  15. GRB 231125A (short): Glowbug gamma-ray detection
  16. GRB 231123B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  17. Update of IceCube-231125A - Corrected errors
  18. GRB 231124A: GRBAlpha detection
  19. IceCube-231125A - IceCube observation of a high-energy neutrino candidate track-like event
  20. Fermi trigger No 722653947: Global MASTER-Net observations report
  21. GRB 231126A: Fermi GBM Final Real-time Localization
  22. Fermi trigger No 722460326: Global MASTER-Net observations report
  23. Fermi trigger No 722507896: Global MASTER-Net observations report
  24. GRB 231123C: Swift/BAT-GUANO detection of a short burst likely outside the coded FOV
  25. Fermi trigger No 722462310: Global MASTER-Net observations report
  26. LIGO/Virgo/KAGRA S231118an: Updated Sky localization and EM Bright Classification
  27. GRB 231124A: CALET Gamma-Ray Burst Monitor detection
  28. GRB 231124A: Fermi GBM Final Real-time Localization
  29. GRB 231123C: Fermi GBM Final Real-time Localization
  30. GRB 231123B: Fermi GBM Final Real-time Localization
  31. Fermi trigger No 722400249: Global MASTER-Net observations report
  32. LIGO/Virgo/KAGRA S231123cg: Identification of a GW compact binary merger candidate
  33. GRB 231118A: REM optical afterglow detection
  34. GRB 231122B: AstroSat CZTI detection
  35. GRB 231122B: Swift/BAT-GUANO detection of a long burst outside the coded FOV
  36. GRB 231117A: Chandra afterglow detection
  37. GRB 231123A: Fermi GBM Final Real-time Localization
  38. Fermi trigger No 722349867: Global MASTER-Net observations report
  39. GRB 231122A: GECAM detection
  40. GRB 231122B: GECAM detection
  41. GRB 231122A: Fermi GBM Final Real-time Localization
  42. GRB 231117A: Swift/UVOT late time observations
  43. GRB 231117A: Swift-BAT refined analysis
  44. GRB 231118A: GRBAlpha detection
  45. LIGO/Virgo/KAGRA S231118d: Upper limits from Swift/BAT-GUANO
  46. LIGO/Virgo/KAGRA S231118an: Upper limits from Swift/BAT-GUANO
  47. LIGO/Virgo/KAGRA S231114n: Upper limits from Swift/BAT-GUANO
  48. LIGO/Virgo/KAGRA S231113bb: Upper limits from Swift/BAT-GUANO
  49. LIGO/Virgo/KAGRA S231119u: Updated Sky localization and Source Classification
  50. LIGO/Virgo/KAGRA S231118ab: Updated Sky localization and Source Classification
  51. LIGO/Virgo/KAGRA S231118d: Updated Sky localization and Source Classification
  52. GRB 231118A: VZLUSAT-2 detection
  53. GRB 231118A: Swift-BAT refined analysis
  54. Konus-Wind detection of GRB 231020A
  55. GRB 231118B: CALET Gamma-Ray Burst Monitor detection
  56. GRB 231117A : MITSuME Akeno optical afterglow candidate detection
  57. GRB 231118B: Fermi GBM observation
  58. GRB 231118A: Fermi GBM observation
  59. LIGO/Virgo/KAGRA S231119ab: Coverage and upper limits from MAXI/GSC observations
  60. GRB 231120A: Fermi GBM Final Real-time Localization
  61. LIGO/Virgo/KAGRA S231119u: One counterpart neutrino candidate from IceCube neutrino searches
  62. GRB 231118A: VLT/X-shooter redshift
  63. Fermi trigger No 722039659: Global MASTER-Net observations report
  64. LIGO/Virgo/KAGRA S231119u: Identification of a GW compact binary merger candidate
  65. GRB 231117A: GECAM-C detection
  66. GRB 231115A: Upper limit from CALET Gamma-Ray Burst Monitor
  67. GRB 231117A: 10 GHz VLA detection
  68. GRB 231118B: BALROG localization (Fermi Trigger 722039659 / GRB 231118940)
  69. GRB 231118B: Fermi GBM Final Real-time Localization
  70. GRB 231118A: LCOGT Optical Observations
  71. Swift GRB231118.72: Global MASTER-Net observations report
  72. GRB 231117A: Kinder observations with Lulin observatory for AT 2023yba without fading in r band
  73. GRB 231118A: Skynet Optical Afterglow Discovery
  74. GRB 231118A: Fermi GBM Final Real-time Localization
  75. LIGO/Virgo/KAGRA S231118an: Identification of a GW compact binary merger candidate
  76. GRB 231117A: GRBAlpha detection
  77. LIGO/Virgo/KAGRA S231118ab: Identification of a GW compact binary merger candidate
  78. GRB 231115A: Wendelstein Optical/Infrared Observations
  79. GRB 231115A: JinShan optical upper limits
  80. LIGO/Virgo/KAGRA S231118d: Identification of a GW compact binary merger candidate
  81. GRB 231117A: Keck observations indicate presence of optical afterglow in z~0.3-0.5 galaxy
  82. GRB 231117A: REM optical and NIR early-time observations
  83. GRB231117A: AGILE/MCAL analysis
  84. GRB 231117A: AKO Optical Upper Limit
  85. GRB 231117A: afterglow candidate detection from Kinder observations with Lulin observatory
  86. Swift GRB 231117A: Global MASTER-Net observations report
  87. GRB 231117A: ATLAS non-detection of an optical counterpart
  88. Konus-Wind detection of GRB 231117A (short/hard)
  89. GRB 231115A : OHP/T120 optical upper limit
  90. GRB 231117A : MITSuME Akeno optical upper limits
  91. GRB 231117A: Swift detection of a bright short burst
  92. GRB 231115A: Non-detection of radio emission with CHIME/FRB
  93. GRB 231115A: Swift/BAT-GUANO detection of a short burst
  94. Fermi GRB 231116A: Global MASTER-Net observations report
  95. Konus-Wind detection of GRB 231115A (a probable Magnetar Giant Flare from M82)
  96. GRB 231115A: AGILE/MCAL upper limits
  97. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  98. GRB 231116A: Fermi GBM Final Real-time Localization
  99. GRB 231115A : MITSuME Akeno and Okayama optical upper limits
  100. GRB 231115A: archival Chandra X-ray observations

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