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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"

5859 results found.

  1. GRB 231108A: Fermi GBM Final Real-time Localization
  2. Fermi trigger No 721006392: Global MASTER-Net observations report
  3. GRB 231104A: Wendelstein Optical/Infrared Observations
  4. IceCube-231103A: Upper limits from a search for additional neutrino events in IceCube
  5. Fermi-LAT gamma-ray observations of IceCube-231103A
  6. Fermi GRB 231103A: Global MASTER-Net observations report
  7. IceCube-231103A - IceCube observation of a high-energy neutrino candidate track-like event
  8. Fermi GRB 231030B: Global MASTER-Net observations report
  9. IPN triangulation of GRB 231020A
  10. GRB 231028A: CALET Gamma-Ray Burst Monitor detection
  11. LIGO/Virgo/KAGRA S231029k: Global MASTER-Net observations report
  12. GRB 231028A: AstroSat CZTI detection
  13. GRB 231028A: Glowbug gamma-ray detection
  14. GRB 231028A: Fermi GBM Detection
  15. GRB 231028A: Swift detection of a burst
  16. GRB 231028A: Fermi GBM Final Real-time Localization
  17. LIGO/Virgo/KAGRA S231025t: Global MASTER-Net observations report
  18. LIGO/Virgo/KAGRA S231025a: Global MASTER-Net observations report
  19. GRB 231019A: Glowbug gamma-ray detection
  20. LIGO/Virgo/KAGRA S231021az: Coverage and upper limits from MAXI/GSC observations
  21. GRB 231019A: VZLUSAT-2 detection
  22. LIGO/Virgo/KAGRA S231020ba: Identification of a GW compact binary merger candidate
  23. Fermi GRB 231019A: Global MASTER-Net observations report
  24. GRB 230911C: ATCA detection of possible radio counterpart
  25. GRB 231019A: Fermi GBM Final Real-time Localization
  26. GRB231017A: Fermi GBM Final Localization
  27. LIGO/Virgo/KAGRA S231008ap: Identification of a GW compact binary merger candidate
  28. LIGO/Virgo/KAGRA S231005ah: Identification of a GW compact binary merger candidate
  29. LIGO/Virgo/KAGRA S231001aq: Identification of a GW compact binary merger candidate
  30. LIGO/Virgo/KAGRA S230930al: Identification of a GW compact binary merger candidate
  31. NuEm-230927A: Swift-XRT follow-up
  32. LIGO/Virgo/KAGRA S230928cb: Identification of a GW compact binary merger candidate
  33. AT2023sva / GRB230916B: GIT observations of the afterglow
  34. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-230927A
  35. LIGO/Virgo/KAGRA S230927be: Identification of a GW compact binary merger candidate
  36. Swift Triggers 1192745 and 1192747 are not astrophysical events
  37. LIGO/Virgo/KAGRA S230927l: Identification of a GW compact binary merger candidate
  38. LIGO/Virgo/KAGRA S230922g: DECam GW-MMADS candidates
  39. GRB 230812B: r'-band observations from MISTRAL at Observatoire de Haute-Provence
  40. LIGO/Virgo/KAGRA S230924an: Identification of a GW compact binary merger candidate
  41. LIGO/Virgo/KAGRA S230917af: GRAWITA wide-field observations
  42. LIGO/Virgo/KAGRA S230922g: Identification of a GW compact binary merger candidate
  43. LIGO/Virgo/KAGRA S230922q: Identification of a GW compact binary merger candidate
  44. LIGO/Virgo/KAGRA S230917af: Zwicky Transient Facility observations
  45. LIGO/Virgo/KAGRA S230904n: Classification of the candidate AT2023rkw with DBSP
  46. GRB 230919A: Swift/BAT-GUANO detection of a possibly short burst outside the coded FOV
  47. transient AT2023sva: imaging and spectroscopic observations from MISTRAL at Observatoire de Haute-Provence
  48. GRB 230812B : optical observations from MISTRAL at Observatoire de Haute-Provence
  49. GRB 230919A: AstroSat CZTI detection
  50. LIGO/Virgo/KAGRA S230920al: Identification of a GW compact binary merger candidate
  51. LIGO/Virgo/KAGRA S230919bj: Identification of a GW compact binary merger candidate
  52. GRB 230918B: GOTO detection of a fast-rising transient in the GBM localisation region
  53. GRB 230918A (short): Glowbug gamma-ray detection
  54. GRB 230916B: Glowbug gamma-ray detection
  55. ZTF and SEDM Observations of the Candidate Optical Afterglow AT 2023sva
  56. GRB 230918A: Fermi GBM Final Real-time Localization
  57. GRB 230917A: AstroSat CZTI detection
  58. Swift Triggers 1192480, 1192481, 1192482 and 1192483 are not astrophysical events
  59. LIGO/Virgo/KAGRA S230917af: MAXI/GSC observations
  60. GRB 230915B: Glowbug gamma-ray detection
  61. GRB 230916A: NuSTAR Discovery of Prompt Emission from a Potential GRB
  62. GRB 230911A: Fermi GBM Observation
  63. Swift GRB230916.18: Global MASTER-Net observations report
  64. Fermi trigger No 716572242: Global MASTER-Net observations report
  65. Fermi trigger No 716544961: Global MASTER-Net observations report
  66. Fermi-LAT gamma-ray observations of IceCube-230914A
  67. GRB 230915A: Swift/BAT-GUANO detection of a burst
  68. GRB 230911D: GRBAlpha detection
  69. Swift GRB230916.19: Global MASTER-Net observations report
  70. Swift GRB230916.18: Global MASTER-Net observations report
  71. Swift GRB230916.13: Global MASTER-Net observations report
  72. Swift GRB230916.12: Global MASTER-Net observations report
  73. Swift GRB230916.11: Global MASTER-Net observations report
  74. Swift Trigger 1192233 is not a GRB
  75. IceCube-230914A: Upper limits from a search for additional neutrino events in IceCube
  76. Fermi trigger No 716449174: Global MASTER-Net observations report
  77. IceCube Alert 230914.22: Global MASTER-Net observations report
  78. Swift Trigger 1192088 is not an astrophysical event
  79. Fermi trigger No 716419312: Global MASTER-Net observations report
  80. GRB 230913A: Glowbug gamma-ray detection
  81. IceCube-230914A - IceCube observation of a high-energy neutrino candidate track-like event
  82. LIGO/Virgo/KAGRA S230914ak: Identification of a GW compact binary merger candidate
  83. Swift Trigger 1191994 is not an astrophysical event
  84. Swift GRB230913.70: Global MASTER-Net observations report
  85. LIGO/Virgo/KAGRA S230904n: One ZTF candidate counterpart to coincident neutrino event
  86. Swift Trigger 1191904 is not a GRB
  87. Swift GRB230913.70: Global MASTER-Net observations report
  88. Swift Trigger 1191903 is not an astrophysical event
  89. GRB 230913A: Swift/BAT-GUANO arcminute localization of a burst
  90. Fermi GRB 230913A: Global MASTER-Net observations report
  91. GRB 230911A: GOTO optical counterpart candidate
  92. GRB 230911D: NuSTAR Detection of Prompt Emission
  93. GRB 230911B: AstroSat CZTI detection
  94. GRB 230906A: Chandra detection of the X-ray afterglow
  95. Swift GRB 230911C: Global MASTER-Net observations report
  96. IPN triangulation of GRB 230911D (long)
  97. LIGO/Virgo/KAGRA S230911ae: Identification of a GW compact binary merger candidate
  98. GRB 230911B: GRBAlpha and VZLUSAT-2 joint detection
  99. Fermi trigger No 716145795: Global MASTER-Net observations report
  100. GRB 230911C: GOTO optical upper limits

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