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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"

39369 results found.

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

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