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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"

27302 results found.

  1. Fermi trigger No 712927418: Global MASTER-Net observations report
  2. Swift GRB 230805B: Global MASTER-Net observations report
  3. GRB 230805B: Swift detection of a burst
  4. GRB 230805A: Fermi GBM Final Real-time Localization
  5. GRB 230802A: Fermi GBM observation
  6. GRB 230802A: Swift-BAT refined analysis
  7. GRB 230804A: Fermi GBM Final Real-time Localization
  8. Fermi trigger No 712798043: Global MASTER-Net observations report
  9. GRB 230802A: Swift/UVOT Upper Limits
  10. LIGO/Virgo/KAGRA S230802aq: AstroSat CZTI non-detection and upper limits
  11. Fermi trigger No 712718833: Global MASTER-Net observations report
  12. GRB 230803A: Fermi GBM Final Real-time Localization
  13. Fermi trigger No 712713532: Global MASTER-Net observations report
  14. Fermi trigger No 712651827: Global MASTER-Net observations report
  15. GRB 230802B: Fermi GBM Final Localization
  16. Swift GRB 230802A: Global MASTER-Net observations report
  17. GRB 230802A: BOOTES-5/JGT optical upper limit
  18. LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations
  19. GRB 230802A: Swift-XRT refined Analysis
  20. LIGO/Virgo/KAGRA S230802aq: Coverage and upper limits from MAXI/GSC observations
  21. GRB 230802A: Swift detection of a burst
  22. LIGO/Virgo/KAGRA S230731an: Upper limits from Swift/BAT-GUANO
  23. LIGO/Virgo/KAGRA S230731an: AstroSat CZTI non-detection and upper limits
  24. LIGO/Virgo/KAGRA S230731an: not observable by Fermi-GBM
  25. GRB 230731A: Fermi GBM Final Real-time Localization
  26. LIGO/Virgo/KAGRA S230731an: Coverage and upper limits from MAXI/GSC observations
  27. Fermi trigger No 712390645: Global MASTER-Net observations report
  28. GRB 230728A: Swift-BAT refined analysis
  29. GRB 230723B: Swift-BAT refined analysis
  30. Fermi trigger No 712306969: Global MASTER-Net observations report
  31. GRB 230728A: BOOTES-1 optical upper limit
  32. GRB 230728A: Fermi GBM Observation
  33. GRB 230728A: LCOGT Optical Upper Limit
  34. GRB 230728A: Swift/UVOT Upper Limits
  35. GRB 230728A: Swift-XRT refined Analysis
  36. GRB 230728A: NOT optical observations and possible host galaxy
  37. GRB 230728A: Swift detection of a burst
  38. Swift GRB230728.12: Global MASTER-Net observations report
  39. GRB 230727A: Swift/BAT-GUANO detection of a burst
  40. Fermi trigger No 712143685: Global MASTER-Net observations report
  41. GRB 230727A: Fermi GBM Final Real-time Localization
  42. Integral GRB230726.26: Global MASTER-Net observations report
  43. Konus-Wind detection of GRB 230723A
  44. LIGO/Virgo/KAGRA S230726b: one counterpart neutrino candidate from IceCube neutrino searches
  45. IBAS trigger number 10337: not a real GRB
  46. Integral GRB230725.99: Global MASTER-Net observations report
  47. IceCube Alert 230725.90: Global MASTER-Net observations report
  48. GRB 230723B: GAD Observatory, La Spezia, Italy upper limit
  49. Fermi Gamma-ray Burst Monitor trigger 711982704/230725540 is not a GRB
  50. GRB 230725B: Fermi GBM Final Real-time Localization
  51. GRB 230725A: Fermi GBM Final Real-time Localization
  52. GRB 230723B: Leavitt Observatory upper limit
  53. GRB 230723B: Osservatorio Astronomico Nastro Verde upper limit
  54. GRB 230723B: Montarrenti Observatory upper limit
  55. GRB 230723B: Bassano Bresciano Observatory upper limit
  56. GRB 230723B: Fermi GBM observation
  57. GRB 230723B: Swift-XRT refined Analysis
  58. GRB 230723B: non-detections from Observatoire de Haute-Provence
  59. IceCube Alert 230724.08: Global MASTER-Net observations report
  60. Fermi trigger No 711853834: Global MASTER-Net observations report
  61. GRB 230724A: Fermi GBM Final Real-time Localization
  62. Fermi trigger No 711805358: Global MASTER-Net observations report
  63. GRB 230723B: Swift/UVOT Upper Limits
  64. Swift GRB 230723B: Global MASTER-Net observations report
  65. Swift-XRT position for GRB 230723B
  66. GRB 230723B: Swift-XRT observations
  67. GRB 230723B: Swift detection of a burst
  68. Fermi GRB 230723A: Global MASTER-Net observations report
  69. GRB 230723A: Fermi GBM Final Real-time Localization
  70. Swift GRB230720.30: Global MASTER-Net observations report
  71. IPN triangulation of GRB 230715D
  72. Swift Trigger 1180063 is not a GRB
  73. Swift Trigger 1180060 is not a GRB
  74. Swift Trigger 1180055 is not a GRB
  75. GRB 230718A: Final Localization Correction
  76. GRB 230718A: Fermi GBM Final Real-time Localization
  77. Fermi Gamma-ray Burst Monitor trigger 711329677/230717982 is not a GRB
  78. IPN triangulation of GRB 230712C (short)
  79. IPN triangulation of GRB 230712A (short)
  80. GRB 230717A: Fermi GBM Final Real-time Localization
  81. LIGO/Virgo/KAGRA S230715bw: Retraction of GW compact binary merger candidate
  82. Fermi trigger No 711088412: Global MASTER-Net observations report
  83. GRB 230715A: Fermi GBM Final Real-time Localization
  84. Fermi GRB 230713A: Global MASTER-Net observations report
  85. IceCube-230707A : MAXI upper limit and NICER follow-up observation of Swift J1753.5-0127
  86. GRB 230713A: Fermi GBM Final Real-time Localization
  87. GRB 230709B: CALET Gamma-Ray Burst Monitor detection
  88. GRB 230703A: CALET Gamma-Ray Burst Monitor detection
  89. GRB 230709C: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  90. IceCube-230708A: Upper limits from Swift/BAT-GUANO
  91. GRB 230712B: Fermi GBM Final Localization
  92. LIGO/Virgo/KAGRA S230712a: Retraction of GW compact binary merger candidate
  93. GRB 230712A: Fermi GBM Final Real-time Localization
  94. Fermi trigger No 710741042: Global MASTER-Net observations report
  95. GRB 230709C: Fermi GBM Detection
  96. GRB 230709C: Fermi GBM Final Localization
  97. GRB 230707B: Fermi GBM Observation
  98. GRB 230710A: Fermi GBM Final Real-time Localization
  99. IceCube-230707A: No candidates detected by Swift-XRT
  100. Swift Trigger 1178410 is not an astrophysical event

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