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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').

823 results found.

  1. GECAM observations of a series of bursts from SGR J1935+2154
  2. GECAM observation of a burst from SGR J1555.2-5402
  3. GECAM detection of a short burst from SGR 1935+2154
  4. GECAM observations of a series of bursts from SGR J1935+2154
  5. GRB 211229A: GECAM detection
  6. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  7. AGILE observations of a bright burst from SGR 1935+2154
  8. IceCube-211216A: Upper limits from a search for additional neutrino events in IceCube
  9. IceCube-211216A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  10. IceCube-211208A: Upper limits from a search for additional neutrino events in IceCube
  11. IceCube-211208A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  12. IceCube-Cascade 211128A: Upper limits from a search for additional neutrino events in IceCube
  13. IceCube-211125A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  14. IceCube-211123A: Upper limits from a search for additional neutrino events in IceCube
  15. HAWC-211123A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  16. GECAM detection of a short burst probably from SGR J1555.2-5402
  17. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  18. GECAM observation of a burst from SGR J1555.2-5402
  19. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  20. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  21. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  22. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  23. Konus-Wind observation of the recent SGR 1935+2154 activity
  24. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  25. AGILE observations of two bright bursts from SGR 1935+2154
  26. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  27. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)
  28. Fermi GBM observation of a bright flare in the direction of SGR 1935+2154
  29. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  30. IPN triangulation of a bright burst from SGR 1935+2154
  31. GECAM observations of a series of bursts from SGR J1935+2154
  32. Swift detection of a burst from SGR Swift J1555.2-5402
  33. GECAM observation of a burst from SGR J1935+2154
  34. GECAM observation of a burst from SGR J1935+2154
  35. GECAM observation of a burst from SGR J1555.2-5402
  36. Fermi GBM trigger 652585475 / 210906073 is not a GRB
  37. Fermi GBM observation of a burst from SGR J1555.2-5402
  38. POLAR detection of a SGR-like burst
  39. Swift detection of an outburst from SGR Swift J1555.2-5402
  40. SGR 1935+2154: SPI INTEGRAL observations on 2021 August 5
  41. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 August 5
  42. IPN Triangulation of a bright burst from SGR 1935+2154
  43. IceCube-210730A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  44. IceCube-210717A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  45. GECAM detection of a short burst from SGR J1935+2154
  46. Recent activity of SGR 1935+2154 as observed by CGBM
  47. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 10
  48. GECAM detection of a short burst from SGR J1935+2154
  49. GECAM detection of a short burst from SGR J1935+2154
  50. GECAM detection of a short burst from SGR 1935+2154
  51. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 7
  52. GECAM detection of a short burst from SGR 1935+2154
  53. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 6
  54. Fermi GBM Observations of SGR J1935+2154
  55. Swift-BAT detection of a burst from SGR 1935+2154
  56. GECAM detection of a bright short burst from SGR 1935+2154
  57. INTEGRAL detection of a burst from SGR 1935+2154
  58. IceCube-210516A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  59. IceCube-210510A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  60. IceCube-210629A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  61. Fermi GBM observation of a bright burst in the direction of SGR 1935+2154
  62. Swift Trigger 1057131: detection of a burst from SGR Swift J1555.2-5402
  63. GECAM Sub-Threshold Detection of new magnetar Swift SGR J1555.2-5402
  64. Fermi GBM Sub-Threshold Detection of new Swift SGR J1555.2-5402
  65. SGR J1555.2-5402: Swift-BAT refined analysis
  66. Swift J1555.2-5402: Swift XRT refined analysis of the new SGR
  67. NICER discovery of 3.86 s pulsations from a new magnetar: SGR J1555.2-5402
  68. Swift Detection of probable new Swift SGR J1555.2-5402
  69. Fermi GBM observation of a bright burst from magneta
  70. Fermi GRB 210510A: Global MASTER-Net observations report
  71. Fermi-LAT Gamma-ray Observations of IceCube-210503A and detection of a new gamma-ray source, Fermi J0931.9+3633
  72. GRB 210402A: MASTER prompt and follow up optical observation
  73. Fermi/GBM observation of a burst from SGR 1830-0645
  74. Swift Trigger 1033144: Detection of SGR 1830-0645
  75. Swift Trigger 1032350: Detection of SGR 1830-0645
  76. Fermi-LAT Gamma-ray Observations of IceCube-210210A
  77. IceCube-210210A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  78. SGR 1935+2154: MAXI/GSC detection
  79. Fermi GBM Observations of a bright burst from SGR J1935+2154
  80. Recent activity of SGR 1935+2154 as observed by CGBM
  81. INTEGRAL detection of a short burst from SGR 1935+2154
  82. GECAM observations of SGR 1935+2154
  83. Fermi GBM Observations of SGR J1935+2154
  84. Konus-Wind detection of two bright bursts from SGR 1935+2154
  85. IPN triangulation of a bright burst from SGR 1935+2154
  86. GECAM detection of a short burst probably from SGR 1935+2154
  87. IPN triangulation of GRB 210124B (short)
  88. GRB 210119A (Swift J1851.2-6148): Swift-BAT refined analysis
  89. GECAM detection of a short GRB 210119A or a new SGR candidate Swift J1851.2-6148
  90. GRB 210119A: Fermi GBM observation
  91. Short Fermi GRB 210119A or new SGR Swift J1851.2-6148: Possible MASTER Short OT detection
  92. Swift detection of a new SGR Swift J1851.2-6148 or a short GRB 210119A
  93. NuEm-210111A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  94. GRB 201227A: continued Chilescope confirmation of variability of possible optical counterpart, redshift estimating
  95. IceCube-201222A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  96. IceCube-201221A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  97. IceCube-201209A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  98. IceCube-201130A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  99. IceCube-201120A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  100. IceCube-201115A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation

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