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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').

3410 results found.

  1. GRB 221029A: Fermi GBM Final Localization
  2. GRB 221029A: Detection by GRBAlpha
  3. GRB 221028A: COATLI Upper Limits
  4. Konus-Wind detection of GRB 221017A
  5. GRB 221027A: Fermi GBM detection
  6. GRB 221024A: Mondy optical observations
  7. IPN triangulation of GRB 221022C (short)
  8. SGR 1935+2154: AstroSat CZTI Detections
  9. GRB 221009A: SARA-RM 1m Optical Afterglow Detection
  10. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  11. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  12. GRB 221017A: CALET Gamma-Ray Burst Monitor detection
  13. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  14. GRB 221009A: Continued LDT Afterglow Monitoring
  15. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  16. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  17. SGR 1935+2154: Detection by GRBAlpha
  18. The probability of observing GRB 221009A at z = 0.151
  19. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  20. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  21. IPN triangulation of GRB 221017A (long)
  22. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  23. GRB 221009A: continued Assy optical afterglow observations, possible SN evidence
  24. Konus-Wind observation of the recent SGR 1935+2154 activity
  25. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  26. GRB 221014A: Fermi GBM Final Real-time Localization
  27. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  28. Fermi trigger No 687345829: Global MASTER-Net observations report
  29. Fermi trigger No 687344475: Global MASTER-Net observations report
  30. Fermi trigger No 687340841: Global MASTER-Net observations report
  31. Fermi trigger No 687337536: Global MASTER-Net observations report
  32. Integral GRB221013.00: Global MASTER-Net observations report
  33. Afterglow limits of GRB 221006A from OHP
  34. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  35. INTEGRAL shows increasing activity in SGR J1935+2154
  36. Fermi trigger No 687205006: Global MASTER-Net observations report
  37. INTEGRAL detection of a burst from SGR J1935+2154
  38. GRB 220829A: Detection by GRBAlpha
  39. INTEGRAL detection of a burst from SGR J1935+2154
  40. GRB 221009A (Swift J1913.1+1946): Burke-Gaffney Observatory optical observations
  41. GRB 221009A (Swift J1913.1+1946): MeerLICHT observations
  42. GRB 221006A: Swift-XRT observations
  43. GRB 221006A: MAXI/GSC detection
  44. Fermi GBM trigger 686350260/221001869 is not a GRB
  45. Fermi trigger No 686403226: Global MASTER-Net observations report
  46. Fermi trigger No 686350260: Global MASTER-Net observations report
  47. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  48. Fermi GRB 220925A: Global MASTER-Net observations report
  49. Fermi trigger No 685748699: Global MASTER-Net observations report
  50. GRB 220921A: MeerLICHT afterglow observations
  51. Fermi trigger No 685452089: Global MASTER-Net observations report
  52. Fermi trigger No 684894705: Global MASTER-Net observations report
  53. Konus-Wind detection of GRB 220910A
  54. Fermi GRB 220912A: Global MASTER-Net observations report
  55. IPN triangulation of GRB 220905A
  56. Fermi GRB 220905A: Global MASTER-Net observations report
  57. Fermi GRB 220902A: Global MASTER-Net observations report
  58. Fermi trigger No 683654200: Global MASTER-Net observations report
  59. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
  60. Fermi trigger No 683202084: Global MASTER-Net observations report
  61. Fermi trigger No 683183601: Global MASTER-Net observations report
  62. Fermi trigger No 683152759: Global MASTER-Net observations report
  63. Fermi trigger No 682918137: Global MASTER-Net observations report
  64. IceCube Alert 220822.85: Global MASTER-Net observations report
  65. GRB 220730A: Swift-BAT refined analysis
  66. GRB 220730A: Swift-XRT afterglow detection
  67. GRB 220730A: Swift-XRT observations
  68. GRB 220729A: AstroSat CZTI detection
  69. GRB 220730A: Swift detection of a short hard burst
  70. Fermi trigger No 680782656: Global MASTER-Net observations report
  71. Fermi GRB 220728A: Global MASTER-Net observations report
  72. Fermi GRB 220721A: Global MASTER-Net observations report
  73. Fermi GRB 220711B: Global MASTER-Net observations report
  74. GRB 220710A: Swift/BAT-GUANO arcminute localization
  75. GRB 220708A: Swift detection of a burst
  76. IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
  77. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  78. IceCube-220629A: No significant detection in HAWC
  79. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  80. IceCube Alert 220629.99: Global MASTER-Net observations report
  81. Trigger 1113743: Swift detection of MAXI J0655-013
  82. Fermi GRB 220623B: Global MASTER-Net observations report
  83. IPN triangulation of GRB 220624A
  84. Fermi GRB 220620A: Global MASTER-Net observations report
  85. GRB 220617A: Swift-XRT observations
  86. GRB 220618A: Swift detection of a burst
  87. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  88. IPN triangulation of GRB 220606C
  89. Fermi trigger No 676909037: Global MASTER-Net observations report
  90. Fermi GRB 220610A: Global MASTER-Net observations report
  91. Fermi trigger No 676537486: Global MASTER-Net observations report
  92. Fermi trigger No 675992935: Global MASTER-Net observations report
  93. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  94. Fermi trigger No 675411172: Global MASTER-Net observations report
  95. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  96. IPN triangulation of GRB 220524B
  97. Konus-Wind detection of GRB 220521B
  98. IPN triangulation of GRB 220521B
  99. Fermi GRB 220523B: Global MASTER-Net observations report
  100. GRB 220523A: Fermi GBM Final Real-time Localization

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