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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.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

24541 results found.

  1. IPN triangulation of GRB 230906A (short)
  2. Fermi GRB 230906A: Global MASTER-Net observations report
  3. GRB 230812B: Chandra late-time detection of the X-ray afterglow
  4. GRB 230906A: Fermi GBM Final Localizationn
  5. GRB 230905B: GECAM-C detection of a long burst
  6. LIGO/Virgo/KAGRA S230904n: Updated Sky localization and EM Bright Classification
  7. GRB 230905A: Fermi GBM Final Real-time Localization
  8. GRB 230903A: Swift-BAT refined analysis
  9. GRB 230904C: Fermi GBM Final Localization
  10. Fermi trigger No 715552087: Global MASTER-Net observations report
  11. Fermi trigger No 715429986: Global MASTER-Net observations report
  12. Fermi GRB 230903A: Global MASTER-Net observations report
  13. GRB 230903A: Fermi GBM detection
  14. LIGO/Virgo/KAGRA S230904n: 1 counterpart neutrino candidate from IceCube neutrino searches
  15. GRB 230904B: BALROG localization (Fermi Trigger 715526984 / GRB 230904562)
  16. Fermi GRB 230904A: Global MASTER-Net observations report
  17. GRB 230904A: Fermi GBM Final Real-time Localization
  18. LIGO/Virgo/KAGRA S230904n: Identification of a GW compact binary merger candidate
  19. GRB 230903A: LCOGT Optical Upper Limits
  20. Swift GRB230903.72: Global MASTER-Net observations report
  21. GRB 230903A: Fermi GBM Final Real-time Localization
  22. Integral GRB230902.00: Global MASTER-Net observations report
  23. LIGO/Virgo/KAGRA S230831e: Updated Sky localization
  24. LIGO/Virgo/KAGRA S230831e: Identification of a GW compact binary merger candidate
  25. LIGO/Virgo/KAGRA S230820bq: Updated Sky localization
  26. LIGO/Virgo/KAGRA S230814ah: Updated Sky localization
  27. GRB 230827A: Fermi GBM Observation
  28. GRB 230826A: Swift-BAT refined analysis
  29. GRB 230828A: GRBAlpha detection
  30. GRB 230827A: VZLUSAT-2 detection
  31. GRB 230827A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  32. GRB 230826A: VZLUSAT-2 detection
  33. GRB 230827B: VZLUSAT-2 detection
  34. GRB 230827B / GRB 230827256: Fermi GBM Observation
  35. GRB 230827A: GRBAlpha detection
  36. GRB 230827A: BALROG localization (Fermi Trigger / GRB 230827762)
  37. Fermi trigger No 714809315: Global MASTER-Net observations report
  38. GRB 230827.256: AKO Optical follow-up of ZTF23abaanxz (AT 2023qxj)
  39. Fermi GRB 230827A: Global MASTER-Net observations report
  40. GRB 230827.256 : GIT optical follow-up of ZTF23abaanxz/AT2023qxj
  41. GRB 230827A: Fermi GBM Final Real-time Localization
  42. AT 2023qxj: ZTF discovery of the likely afterglow of Fermi GRB 230827256
  43. GRB 230826A: GRBAlpha detection
  44. GRB 230826A: Fermi GBM Observation
  45. Swift J1727.8-1613 (GRB 230824A): Leavitt Observatory optical observations
  46. Swift J1727.8-1613 (GRB 230824A): GAD Observatory La Spezia - optical observations
  47. GRB 230826A: Swift detection of a burst
  48. GRB 230826A: Fermi GBM Final Real-time Localization
  49. Swift GRB230826.81: Global MASTER-Net observations report
  50. Swift J1727.8-1613 (GRB 230824A): Bassano Bresciano Observatory optical observations
  51. LIGO/Virgo/KAGRA S230825k: Upper limits from Swift/BAT-GUANO
  52. Swift GRB230825.85: Global MASTER-Net observations report
  53. Swift J1727.8-1613 (GRB 230824A): Skynet Optical Observations
  54. Swift GRB230825.75: Global MASTER-Net observations report
  55. NICER detection of Swift J1727.8-1613 (GRB 230824A)
  56. LIGO/Virgo/KAGRA S230825k: Updated Sky localization
  57. LIGO/Virgo/KAGRA S230825k: Identification of a GW compact binary merger candidate
  58. Fermi trigger No 714618399: Global MASTER-Net observations report
  59. GRB 230824A: AKO Optical Afterglow Candidate
  60. Trigger 1186982: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  61. Integral GRB230824.72: Global MASTER-Net observations report
  62. GRB 230824A: Swift detection of a burst
  63. Swift GRB230824.58: Global MASTER-Net observations report
  64. LIGO/Virgo/KAGRA S230824r: Updated Sky localization
  65. LIGO/Virgo/KAGRA S230824r: Identification of a GW compact binary merger candidate
  66. Swift GRB230824.10: Global MASTER-Net observations report
  67. GRB 230822A: Fermi GBM Observation
  68. LIGO/Virgo/KAGRA S230822bm: Upper limits from Swift/BAT-GUANO
  69. GRB 230822A: Swift/BAT-GUANO detection of a burst
  70. IceCube-230823A: Event likely due to background
  71. IceCube-230823A - IceCube observation of a high-energy neutrino candidate track-like event
  72. GRB 230812B: AstroSat LAXPC detection
  73. GRB 230818B: VZLUSAT-2 detection
  74. GRID detection of GRB 230818A
  75. LIGO/Virgo/KAGRA S230822bm: Updated Sky localization
  76. GRB 230822A: Fermi GBM Final Real-time Localization
  77. LIGO/Virgo/KAGRA S230822bm: Identification of a GW compact binary merger candidate
  78. Swift GRB230821.64: Global MASTER-Net observations report
  79. GRB 230818A: Swift-BAT refined analysis
  80. Konus-Wind detection of GRB 230818A
  81. GRB 230812B : GRANDMA/Kilonova-Catcher optical afterglow detection and upper limits
  82. Swift GRB230820.81: Global MASTER-Net observations report
  83. Swift GRB230820.80: Global MASTER-Net observations report
  84. LIGO/Virgo/KAGRA S230820bq: Identification of a GW compact binary merger candidate
  85. Swift GRB230820.82: Global MASTER-Net observations report
  86. GRB 230818A: Fermi GBM Observation
  87. LIGO/Virgo/KAGRA S230819ax: Updated Sky localization
  88. LIGO/Virgo/KAGRA S230819ax: Identification of a GW compact binary merger candidate
  89. Fermi GRB 230818A: Global MASTER-Net observations report
  90. Fermi trigger No 713974668: Global MASTER-Net observations report
  91. GRB 230818A: Swift detection of a burst
  92. GRB 230818A: Fermi GBM Final Real-time Localization
  93. Swift GRB230818.98: Global MASTER-Net observations report
  94. Swift GRB230818.98: Global MASTER-Net OT detection
  95. GRB 230816A: Swift-BAT refined analysis
  96. GRB 230816A: SVOM/C-GFT optical detection
  97. Fermi GRB 230817A: Global MASTER-Net observations report
  98. GRB 230817A: BALROG localization (Fermi Trigger 713966581 / GRB 230817502)
  99. GRB 230817A: Fermi GBM Final Real-time Localization
  100. Swift GRB230816.80: Global MASTER-Net observations report

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