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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"

28252 results found.

  1. ZTF23aaoohpy/AT2023lcr: JWST spectroscopy confirmation of an associated type Ic-BL supernova
  2. GRB 230812A: Fermi GBM Final Real-time Localization
  3. GRB 230808A: Fermi GBM Detection
  4. LIGO/Virgo/KAGRA S230810af: Retraction of GW compact binary merger candidate
  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. GRB 230808B: Fermi GBM Final Real-time Localization
  9. ZTF23aaoohpy/AT2023lcr: JWST observations consistent with the presence of a supernova
  10. GRB 230808A: Fermi GBM Final Real-time Localization
  11. GRB 230807A: Fermi GBM Final Real-time Localization
  12. Konus-Wind detection of GRB 230803A
  13. GRB 230806A: Fermi GBM Final Localization
  14. GRB 230805B: Enhanced Swift-XRT position
  15. GRB 230805B: Swift/UVOT Upper Limits
  16. GRB 230805B: BOOTES-6/DPRT optical upper limit and 1.5m OSN detection
  17. GRB 230805B: NOT optical afterglow confirmation
  18. GRB 230805B: Swift-XRT refined Analysis
  19. GRB 230805B: SAO RAS optical observations
  20. GRB 230805B: Swift detection of a burst
  21. GRB 230805A: Fermi GBM Final Real-time Localization
  22. GRB 230802B: AstroSat CZTI detection
  23. GRB 230804A: Fermi GBM Final Real-time Localization
  24. IPN triangulation of GRB 230803A
  25. GRB 230802A: Swift/UVOT Upper Limits
  26. GRB 230803A: AstroSat CZTI detection
  27. LIGO/Virgo/KAGRA S230802aq: AstroSat CZTI non-detection and upper limits
  28. GRB 230803A: Fermi GBM Final Real-time Localization
  29. GRB 230802B: Fermi GBM Final Localization
  30. GRB 230802A: BOOTES-5/JGT optical upper limit
  31. LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations
  32. GRB 230802A: Swift-XRT refined Analysis
  33. GRB 230802A: Enhanced Swift-XRT position
  34. GRB 230802A: Swift detection of a burst
  35. LIGO/Virgo/KAGRA S230731an: AstroSat CZTI non-detection and upper limits
  36. GRB 230731A: Fermi GBM Final Real-time Localization
  37. GRB 230723A: Detection of candidate millimeter-band radiation by SPT-3G
  38. GRB 230723B: MITSuME Ishigaki optical observation
  39. GRB 230728A: BOOTES-1 optical upper limit
  40. GRB 230728A: Fermi GBM Observation
  41. GRB 230728A: LCOGT Optical Upper Limit
  42. GRB 230728A: Swift/UVOT Upper Limits
  43. GRB 230728A: Swift-XRT refined Analysis
  44. GRB 230728A: Enhanced Swift-XRT position
  45. GRB 230728A: NOT optical observations and possible host galaxy
  46. GRB 230727A: AstroSat CZTI detection
  47. GRB 230728A: Swift detection of a burst
  48. GRB 230727A: Swift/BAT-GUANO detection of a burst
  49. IceCube-230727A - IceCube observation of a high-energy neutrino candidate track-like event
  50. GRB 230727A: Fermi GBM Final Real-time Localization
  51. GRB 230723B: Further CAHA observations and host galaxy detection
  52. Konus-Wind detection of GRB 230723A
  53. GRB 230723B: MITSuME Akeno optical afterglow candidate detection
  54. GRB 230723B: ATCA rapid radio follow-up
  55. IceCube-230724A - IceCube observation of a high-energy neutrino candidate track-like event
  56. IceCube-230725A - IceCube observation of a high-energy neutrino candidate track-like event
  57. GRB 230723B: GAD Observatory, La Spezia, Italy upper limit
  58. IPN triangulation of GRB 230723A (short)
  59. GRB 230725B: Fermi GBM Final Real-time Localization
  60. GRB 230725A: Fermi GBM Final Real-time Localization
  61. GRB 230723B: Optical afterglow candidate from CAHA
  62. GRB 230723B: Swift-XRT refined Analysis
  63. GRB 230723B: non-detections from Observatoire de Haute-Provence
  64. GRB 230724A: Fermi GBM Final Real-time Localization
  65. GRB 230723B: Optical limit from CAHA
  66. GRB 230723B: Swift/UVOT Upper Limits
  67. Swift-XRT position for GRB 230723B
  68. GRB 230723A: AGILE/MCAL detection
  69. GRB 230723B: Swift-XRT observations
  70. GRB 230723B: Swift detection of a burst
  71. GRB 230723A: Fermi GBM Final Real-time Localization
  72. GRB 230718A: Final Localization Correction
  73. GRB 230718A: Fermi GBM Final Real-time Localization
  74. IPN triangulation of GRB 230712A (short)
  75. GRB 230717A: Fermi GBM Final Real-time Localization
  76. LIGO/Virgo/KAGRA S230715bw: Retraction of GW compact binary merger candidate
  77. GRB 230715A: Fermi GBM Final Real-time Localization
  78. IceCube-230707A : MAXI upper limit and NICER follow-up observation of Swift J1753.5-0127
  79. GRB 230713A: Fermi GBM Final Real-time Localization
  80. GRB 230709B: CALET Gamma-Ray Burst Monitor detection
  81. GRB 230703A: CALET Gamma-Ray Burst Monitor detection
  82. GRB 230709C: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  83. GRB 230712B: Fermi GBM Final Localization
  84. GRB 230712A: Fermi GBM Final Real-time Localization
  85. GRB 230709C: GRBAlpha detection
  86. GRB 230709B: GRBAlpha detection
  87. GRB 230709C: Fermi GBM Detection
  88. GRB 230709C: Fermi GBM Final Localization
  89. GRB 230710A: Fermi GBM Final Real-time Localization
  90. IceCube-230707A: No candidates detected by Swift-XRT
  91. Swift Trigger 1178410 is not an astrophysical event
  92. GRB 230709C: AstroSat CZTI detection
  93. GRB 230707B: CALET Gamma-Ray Burst Monitor detection
  94. Swift Trigger 1178410: possible GRB 230709A
  95. GRB 230628C: GRID Detection
  96. IceCube-230708A - IceCube observation of a high-energy neutrino candidate track-like event
  97. GRB 230707B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  98. GRB 230707A: Swift-XRT observations
  99. IceCube-230707B - IceCube observation of a high-energy neutrino candidate track-like event
  100. GRB 230707B: Fermi GBM Final Real-time Localization

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