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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"

37766 results found.

  1. Fermi trigger No 713525317: Global MASTER-Net observations report
  2. GRB 230812A: Fermi GBM Final Real-time Localization
  3. GRB 230808A: Fermi GBM Detection
  4. GRB 230805B: Swift-BAT refined analysis
  5. GRB 230805B: Iota Scorpii Observatory, La Spezia, Italy upper limit
  6. GRB 230805B: AstroSat CZTI detection
  7. GRB 230808A: Swift/BAT-GUANO detection of a burst
  8. Fermi trigger No 713136868: Global MASTER-Net observations report
  9. GRB 230808B: Fermi GBM Final Real-time Localization
  10. The Fermi GBM Trigger 713134237 / 230807868 is not associated with LIGO/Virgo/KAGRA S230807f.
  11. Fermi trigger No 713205976: Global MASTER-Net observations report
  12. ZTF23aaoohpy/AT2023lcr: JWST observations consistent with the presence of a supernova
  13. GRB 230808A: Fermi GBM Final Real-time Localization
  14. GRB 230805B : MITSuME Akeno optical upper limits
  15. Fermi GRB 230807A: Global MASTER-Net observations report
  16. Fermi trigger No 713134237: Global MASTER-Net observations report
  17. GRB 230807A: Fermi GBM Final Real-time Localization
  18. LIGO/Virgo/KAGRA S230805x: Upper limits from Swift/BAT-GUANO
  19. Konus-Wind detection of GRB 230803A
  20. GRB 230805B: Fermi GBM observation
  21. GRB 230805B : OHP/T193 optical upper limit
  22. GRB 230806A: Fermi GBM Final Localization
  23. GRB 230805B: Enhanced Swift-XRT position
  24. GRB 230805B: Swift/UVOT Upper Limits
  25. Fermi trigger No 712991593: Global MASTER-Net observations report
  26. GRB 230805B: Bassano Bresciano observatory upper limit
  27. Fermi trigger No 712987357: Global MASTER-Net observations report
  28. GRB 230805B: BOOTES-6/DPRT optical upper limit and 1.5m OSN detection
  29. GRB 230805B: NOT optical afterglow confirmation
  30. GRB 230805B: Swift-XRT refined Analysis
  31. Fermi GRB 230805A: Global MASTER-Net observations report
  32. GRB 230805B: SAO RAS optical observations
  33. Fermi trigger No 712927418: Global MASTER-Net observations report
  34. Swift GRB 230805B: Global MASTER-Net observations report
  35. GRB 230805B: Swift detection of a burst
  36. GRB 230805A: Fermi GBM Final Real-time Localization
  37. GRB 230802B: AstroSat CZTI detection
  38. GRB 230802A: Fermi GBM observation
  39. GRB 230802A: Swift-BAT refined analysis
  40. GRB 230804A: Fermi GBM Final Real-time Localization
  41. Fermi trigger No 712798043: Global MASTER-Net observations report
  42. IPN triangulation of GRB 230803A
  43. GRB 230802A: Swift/UVOT Upper Limits
  44. GRB 230803A: AstroSat CZTI detection
  45. LIGO/Virgo/KAGRA S230802aq: AstroSat CZTI non-detection and upper limits
  46. Fermi trigger No 712718833: Global MASTER-Net observations report
  47. GRB 230803A: Fermi GBM Final Real-time Localization
  48. Fermi trigger No 712713532: Global MASTER-Net observations report
  49. Fermi trigger No 712651827: Global MASTER-Net observations report
  50. GRB 230802B: Fermi GBM Final Localization
  51. Swift GRB 230802A: Global MASTER-Net observations report
  52. GRB 230802A: BOOTES-5/JGT optical upper limit
  53. LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations
  54. GRB 230802A: Swift-XRT refined Analysis
  55. GRB 230802A: Enhanced Swift-XRT position
  56. LIGO/Virgo S230802aq: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  57. GRB 230802A: Swift detection of a burst
  58. LIGO/Virgo/KAGRA S230731an: Upper limits from Swift/BAT-GUANO
  59. GRB 230723A: SPT-3G millimeter-band transient event inconsistent with IPN position
  60. LIGO/Virgo/KAGRA S230731an: AstroSat CZTI non-detection and upper limits
  61. LIGO/Virgo/KAGRA S230731an: not observable by Fermi-GBM
  62. GRB 230731A: Fermi GBM Final Real-time Localization
  63. GRB 230723A: Detection of candidate millimeter-band radiation by SPT-3G
  64. Fermi trigger No 712390645: Global MASTER-Net observations report
  65. GRB 230728A: Swift-BAT refined analysis
  66. Fermi-LAT gamma-ray observations of IceCube-230727A
  67. GRB 230723B: Swift-BAT refined analysis
  68. Fermi trigger No 712306969: Global MASTER-Net observations report
  69. GRB 230723B: MITSuME Ishigaki optical observation
  70. GRB 230728A: BOOTES-1 optical upper limit
  71. GRB 230728A: Fermi GBM Observation
  72. GRB 230728A: LCOGT Optical Upper Limit
  73. GRB 230728A: Swift/UVOT Upper Limits
  74. GRB 230728A: Swift-XRT refined Analysis
  75. GRB 230728A: Enhanced Swift-XRT position
  76. GRB 230728A: NOT optical observations and possible host galaxy
  77. GRB 230727A: AstroSat CZTI detection
  78. GRB 230728A: Swift detection of a burst
  79. GRB 230727A: Swift/BAT-GUANO detection of a burst
  80. Fermi-LAT gamma-ray observations of IceCube-230725A
  81. Fermi-LAT gamma-ray observations of IceCube-230724A
  82. Fermi trigger No 712143685: Global MASTER-Net observations report
  83. IceCube-230727A - IceCube observation of a high-energy neutrino candidate track-like event
  84. GRB 230727A: Fermi GBM Final Real-time Localization
  85. GRB 230723B: Further CAHA observations and host galaxy detection
  86. Konus-Wind detection of GRB 230723A
  87. GRB 230723B: MITSuME Akeno optical afterglow candidate detection
  88. GRB 230723B: ATCA rapid radio follow-up
  89. IceCube-230724A - IceCube observation of a high-energy neutrino candidate track-like event
  90. IBAS trigger number 10337: not a real GRB
  91. IceCube-230725A - IceCube observation of a high-energy neutrino candidate track-like event
  92. GRB 230723B: GAD Observatory, La Spezia, Italy upper limit
  93. IPN triangulation of GRB 230723A (short)
  94. Fermi Gamma-ray Burst Monitor trigger 711982704/230725540 is not a GRB
  95. GRB 230725B: Fermi GBM Final Real-time Localization
  96. GRB 230725A: Fermi GBM Final Real-time Localization
  97. GRB 230723B: Leavitt Observatory upper limit
  98. GRB 230723B: Osservatorio Astronomico Nastro Verde upper limit
  99. GRB 230723B: Montarrenti Observatory upper limit
  100. GRB 230723B: Optical afterglow candidate from CAHA

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