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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

35947 results found.

  1. GRB230618A: LCOGT Optical Observations
  2. GRB 230618B: Fermi GBM Final Real-time Localization
  3. GRB 230618A: Prompt enhanced Swift-XRT position
  4. GRB 230618A: Swift detection of a burst
  5. GRB 230616A: Swift ToO observations
  6. GRB 230617A: Fermi GBM Final Real-time Localization
  7. GRB 230614C: GRBAlpha detection
  8. GRB 230616A: AstroSat CZTI detection
  9. GRB 230616A: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  10. GRB 230614C: AstroSat CZTI detection
  11. GRB 230614B: Fermi GBM Observation
  12. GRB 230614C: Fermi GBM Detection
  13. GRB 230614B: Swift/BAT-GUANO detection outside the coded FOV
  14. GRB 230614B: Fermi GBM Final Real-time Localization
  15. GRB 230614A: Fermi GBM Final Real-time Localization
  16. GRB 230606A: LCOGT Optical Observations
  17. GRB 230608A: CALET Gamma-Ray Burst Monitor detection
  18. GRB 230608A: AstroSat CZTI detection
  19. GRB 230608A: AGILE detection
  20. Fermi GRB 230603A: Global MASTER-Net observations report
  21. GRB 230506B: Chandra localization of the X-ray afterglow
  22. GRB 230606A: Swift-BAT refined analysis
  23. GRB 230606A: Gaoyazi/GOT optical upper limit
  24. GRB 230606A: Fermi GBM Observation
  25. GRB 230606A: BOOTES-5/JGT optical upper limit
  26. GRB 230606A: Swift-XRT refined Analysis
  27. GRB 230604A: GRBAlpha detection
  28. GRB 230606A: Swift/UVOT Upper Limits
  29. GRB 230606A: Enhanced Swift-XRT position
  30. GRB 230606A: Swift detection of a burst
  31. GRB 230604A: AstroSat CZTI detection of a short GRB
  32. GRB 230603A: Fermi GBM Final Real-time Localization
  33. GRB 230521A: VZLUSAT-2 detection
  34. GRB 230522A: GRBAlpha and VZLUSAT-2 joint detection
  35. GRB 230525A: CALET Gamma-Ray Burst Monitor detection
  36. LIGO/Virgo/KAGRA S230529ay: Upper limits from Fermi-GBM Observations
  37. LIGO/Virgo/KAGRA S230529ay: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  38. GRB 230529A: Fermi GBM Final Real-time Localization
  39. LIGO/Virgo/KAGRA S230518h: Upper limits from Glowbug gamma-ray observations
  40. GRB 230510A: Swift-BAT refined analysis
  41. GRB 230525A: Fermi GBM Detection
  42. GRB 230525A: Fermi GBM Final Localization
  43. GRB 230523B: GRBAlpha detection
  44. GRB 230524A: Fermi GBM Observation
  45. GRB 230524B: AstroSat CZTI detection
  46. GRB 230524A: AstroSat CZTI detection
  47. GRB 230524A: AGILE detection
  48. GRB 230524A: Fermi GBM Final Real-time Localization
  49. GRB 230523B: Name correction from GCN Circular 33859
  50. GRB 230523A: Swift/BAT-GUANO detection of a short hard burst
  51. Fermi Gamma-ray Burst Monitor trigger 706536788/230523509 is not a GRB
  52. GRB 230523A: Fermi GBM Final Real-time Localization
  53. GRB 230518B: VZLUSAT-2 detection
  54. Fermi Gamma-ray Burst Monitor trigger 706338208/230521211 is not a GRB
  55. IPN triangulation of GRB 230518A (short)
  56. GRB 230520A: CALET Gamma-Ray Burst Monitor detection
  57. GRB 230521A: Fermi GBM Final Real-time Localization
  58. GRB 230520B is not a GRB
  59. GRB 230520B: Fermi GBM Final Real-time Localization
  60. GRB 230520A: MAXI/GSC detection
  61. GRB 230518A: Fermi GBM Observation
  62. LIGO/Virgo/KAGRA S230518h: Upper limits from Konus-Wind observations
  63. GRB 230518A: Swift/BAT-GUANO detection
  64. GRB 230518A: Fermi GBM Final Real-time Localization
  65. Fermi Gamma-ray Burst Monitor trigger 706068974/230518095 is not a GRB
  66. LIGO/Virgo/KAGRA S230518h: Upper limits from Fermi-GBM Observations
  67. LIGO/Virgo S230518h: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  68. GRB 230513A: Zwicky Transient Facility continuous observations of a Fermi Short GRB (Trigger 705709044)
  69. GRB 230510B: GRBAlpha detection
  70. GRB 230517A: BALROG localization (Fermi Trigger 706014351 / GRB 230517462)
  71. Improved IPN triangulation of GRB 230512A
  72. GRB 230517A: Fermi GBM Final Real-time Localization
  73. GRB 230510B: Fermi GBM detection
  74. GRB 230516A: Fermi GBM Final Real-time Localization
  75. IPN triangulation of GRB 230511D (short)
  76. IPN triangulation of GRB 230512A
  77. GRB 230513A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705709044)
  78. GRB 230512A: Nanshan/NEXT non-detection of GRB afterglow candidate
  79. GRB 230512A: Zwicky Transient Facility non-detection of GRB afterglow candidate
  80. GRB 230512A: Liverpool Telescope observations
  81. GRB 230512A: GIT non detection of afterglow candidate
  82. GRB 230512A: Kitab possible afterglow candidate
  83. GRB 230512A: GRBAlpha detection
  84. GRB 230510A: GRBAlpha detection
  85. GRB 230513A: Fermi GBM Final Real-time Localization
  86. GRB 230510A: OHP/T193 and OHP/T120 optical observations
  87. GRB 230512A: Swift-XRT observations
  88. GRB 230512A: GIT optical follow-up ZTF candidates
  89. GRB 230512A: Fermi GBM detection
  90. GRB 230512A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705565670)
  91. GRB 230430A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 704533643)
  92. GRB 230511D: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705537623)
  93. GRB 230512A: Tiled Swift observations
  94. GRB 230512A: Fermi-LAT detection
  95. GRB 230512A: AstroSat CZTI detection
  96. GRB 230512A: Fermi GBM Final Localization
  97. GRB 230510A: GIT optical upper limits
  98. GRB 230510A: LCOGT Optical Upper Limit
  99. GRB 230511D: Fermi GBM Final Real-time Localization
  100. GRB 230510A: Swift/UVOT Observations

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