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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"

36195 results found.

  1. Swift GRB 230805B: Global MASTER-Net observations report
  2. GRB 230805B: Swift detection of a burst
  3. GRB 230805A: Fermi GBM Final Real-time Localization
  4. GRB 230802B: AstroSat CZTI detection
  5. GRB 230802A: Fermi GBM observation
  6. GRB 230802A: Swift-BAT refined analysis
  7. GRB 230804A: Fermi GBM Final Real-time Localization
  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. GRB 230803A: Fermi GBM Final Real-time Localization
  13. GRB 230802B: Fermi GBM Final Localization
  14. Swift GRB 230802A: Global MASTER-Net observations report
  15. GRB 230802A: BOOTES-5/JGT optical upper limit
  16. LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations
  17. GRB 230802A: Swift-XRT refined Analysis
  18. GRB 230802A: Enhanced Swift-XRT position
  19. LIGO/Virgo S230802aq: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  20. GRB 230802A: Swift detection of a burst
  21. LIGO/Virgo/KAGRA S230731an: Upper limits from Swift/BAT-GUANO
  22. GRB 230723A: SPT-3G millimeter-band transient event inconsistent with IPN position
  23. LIGO/Virgo/KAGRA S230731an: AstroSat CZTI non-detection and upper limits
  24. GRB 230731A: Fermi GBM Final Real-time Localization
  25. GRB 230723A: Detection of candidate millimeter-band radiation by SPT-3G
  26. GRB 230728A: Swift-BAT refined analysis
  27. GRB 230723B: Swift-BAT refined analysis
  28. GRB 230723B: MITSuME Ishigaki optical observation
  29. IceCube-230727A: Upper limits from a search for additional neutrino events in IceCube
  30. GRB 230728A: BOOTES-1 optical upper limit
  31. GRB 230728A: Fermi GBM Observation
  32. GRB 230728A: LCOGT Optical Upper Limit
  33. GRB 230728A: Swift/UVOT Upper Limits
  34. GRB 230728A: Swift-XRT refined Analysis
  35. GRB 230728A: Enhanced Swift-XRT position
  36. GRB 230728A: NOT optical observations and possible host galaxy
  37. GRB 230727A: AstroSat CZTI detection
  38. GRB 230728A: Swift detection of a burst
  39. GRB 230727A: Swift/BAT-GUANO detection of a burst
  40. GRB 230727A: Fermi GBM Final Real-time Localization
  41. IceCube-230725A: Upper limits from a search for additional neutrino events in IceCube
  42. IceCube-230724A: Upper limits from a search for additional neutrino events in IceCube
  43. GRB 230723B: Further CAHA observations and host galaxy detection
  44. Konus-Wind detection of GRB 230723A
  45. GRB 230723B: MITSuME Akeno optical afterglow candidate detection
  46. GRB 230723B: ATCA rapid radio follow-up
  47. IBAS trigger number 10337: not a real GRB
  48. GRB 230723B: GAD Observatory, La Spezia, Italy upper limit
  49. IPN triangulation of GRB 230723A (short)
  50. Fermi Gamma-ray Burst Monitor trigger 711982704/230725540 is not a GRB
  51. GRB 230725B: Fermi GBM Final Real-time Localization
  52. GRB 230725A: Fermi GBM Final Real-time Localization
  53. GRB 230723B: Leavitt Observatory upper limit
  54. GRB 230723B: Osservatorio Astronomico Nastro Verde upper limit
  55. GRB 230723B: Montarrenti Observatory upper limit
  56. GRB 230723B: Optical afterglow candidate from CAHA
  57. GRB 230723B: Bassano Bresciano Observatory upper limit
  58. GRB 230723B: Fermi GBM observation
  59. GRB 230723B: Swift-XRT refined Analysis
  60. GRB 230723B: non-detections from Observatoire de Haute-Provence
  61. GRB 230724A: Fermi GBM Final Real-time Localization
  62. GRB 230723B: Optical limit from CAHA
  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 230723A: AGILE/MCAL detection
  67. GRB 230723B: Swift-XRT observations
  68. GRB 230723B: Swift detection of a burst
  69. Fermi GRB 230723A: Global MASTER-Net observations report
  70. GRB 230723A: Fermi GBM Final Real-time Localization
  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. GRB 230715A: Fermi GBM Final Real-time Localization
  82. Fermi GRB 230713A: Global MASTER-Net observations report
  83. GRB 230713A: Fermi GBM Final Real-time Localization
  84. GRB 230709B: CALET Gamma-Ray Burst Monitor detection
  85. GRB 230703A: CALET Gamma-Ray Burst Monitor detection
  86. GRB 230709C: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  87. IceCube-230708A: Upper limits from Swift/BAT-GUANO
  88. GRB 230712B: Fermi GBM Final Localization
  89. GRB 230707A: Swift/BAT-GUANO position correction
  90. GRB 230712A: Fermi GBM Final Real-time Localization
  91. GRB 230709C: GRBAlpha detection
  92. GRB 230709B: GRBAlpha detection
  93. GRB 230709C: Fermi GBM Detection
  94. GRB 230709C: Fermi GBM Final Localization
  95. GRB 230707B: Fermi GBM Observation
  96. GRB 230710A: Fermi GBM Final Real-time Localization
  97. GRB 230709C: AstroSat CZTI detection
  98. GRB 230707B: CALET Gamma-Ray Burst Monitor detection
  99. GRB 230703A detected with multiple GRID detectors
  100. GRB 230709C: BALROG localization (Fermi Trigger 710617111 / GRB 230709735)

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