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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"

24614 results found.

  1. IceCube Alert 211208.84: Global MASTER-Net observations report
  2. GRB 211207A: Swift-BAT refined analysis
  3. GRB 211207A: VLT/X-shooter redshift
  4. Chandra observation of GW170817 at ~1573 days since merger (Epoch 1 of 4)
  5. GRB 211204C: Fermi GBM detection
  6. Swift GRB 211207A: Global MASTER-Net observations report
  7. GRB 211207A: Swift detection of a burst with an optical counterpart
  8. GRB 211206A: Not observable by Fermi-GBM
  9. IPN triangulation of GRB 211204C
  10. GRB 211206A: Swift/BAT-GUANO detection outside the coded FOV
  11. GRB 211204C: Swift/BAT-GUANO detection outside the coded FOV
  12. GRB 211204C: GECAM detection
  13. Fermi GRB 211204C: Global MASTER-Net observations report
  14. GRB 211204C: Fermi GBM Final Real-time Localization
  15. Fermi GRB 211204B: Global MASTER-Net observations report
  16. GRB 211204B: Fermi GBM Final Real-time Localization
  17. Fermi GRB 211204A: Global MASTER-Net observations report
  18. GRB 211204A: Fermi GBM Final Real-time Localization
  19. GRB 211124A: Fermi GBM Observation
  20. Swift GRB 211203A: Global MASTER-Net observations report
  21. Fermi GBM Upper limits for GRB 211203A
  22. Konus-Wind detection of GRB 211130A
  23. IPN triangulation of GRB 211130A
  24. GRB 211201A: GECAM detection
  25. GRB 211201A: Swift/BAT-GUANO detection likely outside the coded FOV
  26. GRB 211106A: Second HST Observation
  27. Fermi GRB 211201A: Global MASTER-Net observations report
  28. GRB 211201A: Fermi GBM Final Real-time Localization
  29. Fermi GRB 211130A: Global MASTER-Net observations report
  30. IceCube-211125A: No significant detection in HAWC
  31. GRB 211130A: BALROG localization (Fermi Trigger 659978192 / GRB 211130636)
  32. GRB 211130A: Fermi GBM Final Real-time Localization
  33. GRB 211106A: GECAM detection
  34. GRB 211129A: Swift-BAT refined analysis
  35. GRB 211129A: Swift-XRT refined Analysis
  36. GRB 211106A: HST Observations
  37. IceCube-Cascade 211128A: Upper limits from a search for additional neutrino events in IceCube
  38. IceCube-211125A: Upper limits from a search for additional neutrino events in IceCube
  39. GRB 211129A: Fermi GBM observation
  40. Swift GRB 211129A: Global MASTER-Net observations report
  41. IPN triangulation of GRB 211118A
  42. GRB 211129A: MITSuME Akeno optical upper limits
  43. GRB 211129A: Swift detection of a burst
  44. IceCube-211125A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  45. GRB 211023A: Xinglong 2.16m optical observations
  46. Fermi-LAT Gamma-ray Observations of IceCube-211125A
  47. GRB 211120548: Fermi GBM observation
  48. Konus-Wind detection of GRB 211120A
  49. IPN triangulation of GRB 211120A
  50. IceCube-211125A: No neutrino counterpart detected with ANTARES
  51. IceCube-211125A: IceCube observation of a high-energy neutrino candidate track-like event
  52. GRB 211118A: Fermi GBM detection
  53. IceCube Alert 211125.27: Global MASTER-Net observations report
  54. Fermi-LAT Gamma-ray Observations of IceCube-211123A
  55. IceCube-211123A: Upper limits from a search for additional neutrino events in IceCube
  56. IceCube-211123A: INTEGRAL was inactive at the time of the event
  57. IceCube-211123A: Upper limits from Fermi-GBM Observations
  58. IceCube-211117A: not observable by Fermi-GBM
  59. IceCube-211116A: not observable by Fermi-GBM
  60. IceCube-211023A: not observable by Fermi-GBM
  61. IPN triangulation of GRB 211124A (short)
  62. HAWC-211123A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  63. HAWC-211123A: not observable by Fermi-GBM
  64. GRB 211124A: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  65. IceCube Alert 211123.60: Global MASTER-Net observations report
  66. HAWC-211123A: No neutrino counterpart detected with ANTARES
  67. IceCube-211123A - IceCube observation of a high-energy neutrino candidate track-like event
  68. Fermi trigger No 659413798: Global MASTER-Net observations report
  69. GRB 211023B: LBT likely spectroscopic redshift of the host galaxy
  70. Alert from the HAWC Burst Monitor HAWC-211123A
  71. GRB 211120A: AGILE detection
  72. Fermi trigger No 659183098: Global MASTER-Net observations report
  73. Fermi trigger No 659106591: Global MASTER-Net observations report
  74. GRB 211120B: Swift/BAT-GUANO detection outside the coded FOV
  75. GRB 211120A: GECAM detection
  76. GRB 211023A: optical observations and photometric evidence of supernova
  77. Fermi-LAT Gamma-ray Observations of IceCube-211117A
  78. GRB211118A: Swift/BAT-GUANO detection outside the coded FOV
  79. Fermi trigger No 658971499: Global MASTER-Net observations report
  80. Search for counterpart to IceCube-211117A with ANTARES
  81. IceCube-211117A : IceCube observation of a high-energy neutrino candidate track-like event
  82. IceCube-211116A: Upper limits from a search for additional neutrino events in IceCube
  83. Fermi-LAT Gamma-ray Observations of IceCube-211116A
  84. IceCube-211116A: No neutrino counterpart detected with ANTARES
  85. IceCube Alert 211116.44: Global MASTER-Net observations report
  86. Fermi trigger No 658755664: Global MASTER-Net observations report
  87. Fermi trigger No 658764238: Global MASTER-Net observations report
  88. IceCube-211116A : IceCube observation of a high-energy neutrino candidate track-like event
  89. GRB 211115A: CALET Gamma-Ray Burst Monitor detection
  90. Fermi trigger No 658686687: Global MASTER-Net observations report
  91. GRB 211023A: classification and SPI-ACS/INTEGRAL registration
  92. Fermi GRB 211112A: Global MASTER-Net observations report
  93. IPN triangulation of GRB 211106A (short)
  94. GRB 211112A: Fermi GBM Final Real-time Localization
  95. Short GRB 211106A: spectroscopy of galaxies in the field
  96. GRB 211110A: GECAM detection
  97. Fermi trigger No 658214822: Global MASTER-Net observations report
  98. GRB 211107A: GECAM detection
  99. GRB 211106A: VLT/FORS2 optical observations
  100. Fermi GRB 211109B: Global MASTER-Net observations report

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