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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"

4169 results found.

  1. GRB 200629A: Fermi GBM Final Real-time Localization
  2. GRB 200629A: BALROG localization (Fermi Trigger 615127794 / GRB 200629535)
  3. Updated catalog of X-ray bursts of SGR J1935+2154 from Insight-HXMT observations
  4. GRB 200623A: TNG optical observations
  5. IceCube-200620A: No significant detection in HAWC
  6. GRB 200613A: CrAO optical observations
  7. GRB 200619A: Fermi GBM observation
  8. Fermi trigger No 614103490: Global MASTER-Net observations report
  9. GRB 200613A: MITSuME Akeno optical upper limits
  10. Fermi GRB 200615A: Global MASTER-Net observations report
  11. IceCube Alert 200614.53: Global MASTER-Net observations report
  12. GRB 200613A: Fermi-LAT detection
  13. Baksan Neutrino Observatory Alert 200611.74: Global MASTER-Net observations report
  14. Fermi GRB 200607A: Global MASTER-Net observations report
  15. IPN triangulation of GRB 200605A (short)
  16. 1RXS J1708−4009: Swift-BAT refined analysis
  17. Fermi GRB 200605A: Global MASTER-Net observations report
  18. Swift detection of an SGR-like burst from 1RXS J1708−4009
  19. IceCube-200530A: Upper limits from a search for additional neutrino events in IceCube
  20. Baksan Neutrino Observatory Alert 200601.42: Global MASTER-Net observations report
  21. Fermi GRB 200531A: Global MASTER-Net observations report
  22. IceCube-200530A: No significant detection in HAWC
  23. IceCube-200530A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  24. GRB 200530A: AstroSat CZTI detection
  25. Fermi GRB 200530A: Global MASTER-Net observations report
  26. GRB 200529A: LCO Optical Afterglow Detection
  27. Fermi GRB 200529B: Global MASTER-Net observations report
  28. Fermi trigger No 612429771: Global MASTER-Net observations report
  29. GRB 200529B: Fermi GBM Final Real-time Localization
  30. GRB 200524A: Assy continued optical observations
  31. GRB 200529A: Fermi GBM Final Real-time Localization
  32. Swift GRB200529.04: Global MASTER-Net observations report
  33. Fermi GRB 200524A: Global MASTER-Net observations report
  34. Fermi GRB 200522B: Global MASTER-Net observations report
  35. Fermi trigger No 611676654: Global MASTER-Net observations report
  36. Fermi trigger No 611434353: Global MASTER-Net observations report
  37. Swift J1818.0-1607: BOOTES-3/YA optical upper limit
  38. Swift Detection of a burst from SGR Swift J1818.0-1607
  39. AGILE detection of a burst from SGR 1935+2154 on May 10, 2020
  40. SGR 1935+2154: AstroSat CZTI detection
  41. Insight-HXMT's continued observation plan for SGR J1935+2154
  42. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  43. IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT
  44. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  45. Swift Detection of a burst from SGR Swift J1818.0-1607
  46. Swift GRB200506.73: Global MASTER-Net observations report
  47. Insight-HXMT detection of a short bright burst from SGR 1935+2154
  48. AGILE detection of a short and hard X-ray burst possibly related to SGR 1935+2154
  49. Geocentric time correction for Insight-HXMT detection of the x-ray counterpart of the FRB by CHIME and STARE2 from SGR 1935+2154
  50. Insight-HXMT X-ray and hard X-ray upper limits to the radio burst detected by FAST from SGR 1935+2154
  51. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  52. Insight-HXMT X-ray and hard X-ray detection of the double peaks of the Fast Radio Burst from SGR 1935+2154
  53. Fermi GBM observation of a flare from the magnetar SGR 1806-20
  54. Trigger 968731: Swift detection of SGR1806-20
  55. Fermi GBM trigger 200429866/609886052 is not a GRB
  56. SGR 1935+2154: MASTER optical observations
  57. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154
  58. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  59. Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
  60. A Forest of Bursts from SGR 1935+2154
  61. SGR 1935+2154: AstroSat CZTI detections
  62. high bursting activity of SGR 1935+2154: CGBM observations
  63. SGR 1935+2154 the Insight-HXMT observation plan
  64. SGR 1935+2154: MAXI/GSC detection
  65. Fermi GBM observation of a bright flare from magnetar SGR 1935+2154
  66. Swift detection of multiple bursts from SGR 1935+2154
  67. Gagarin-day GRB 200412B: observations with the 3.6m Devasthal Optical Telescope
  68. Fermi GRB 200423A: Global MASTER-Net observations report
  69. Konus-Wind observation of a bright burst from SGR 1935+2154
  70. GRB 200415A (possible magnetar Giant Flare in Sculptor Galaxy): INTEGRAL observations
  71. IPN Triangulation of a bright burst from SGR 1935+2154
  72. bright SGR burst detected by CALET Gamma-Ray Burst Monitor
  73. Fermi trigger No 608935505: Global MASTER-Net observations report
  74. GRB 200410A: Optical upper limit
  75. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  76. Fermi GRB 200415A: Global MASTER-Net observations report
  77. GRB 200412B: Tautenburg observations
  78. GRB 200412B: Optical afterglow detection with 1.3m DFOT
  79. Konus-Wind observation of a bright burst from SGR 1935+2154
  80. GRB 200411A: Fermi GBM observation
  81. GRB 200411A: Swift detection of a short burst
  82. GRB 200411A: Fermi GBM Final Real-time Localization
  83. IceCube Alert 200410.97: Global MASTER-Net observations report
  84. SGR 1935+2154: Fermi GBM observation
  85. Fermi trigger No 608204639: Global MASTER-Net observations report
  86. IPN Triangulation of a bright burst from SGR 1935+2154
  87. Baksan Neutrino Observatory Alert 200409.23: Global MASTER-Net observations report
  88. Fermi GRB 200407B: Global MASTER-Net observations report
  89. Baksan Neutrino Observatory Alert 200406.3: Global MASTER-Net observations report
  90. GRB 200405B: LCO Optical Upper Limits
  91. Fermi GRB 200403C: Global MASTER-Net observations report
  92. Fermi GRB 200402C: Global MASTER-Net observations report
  93. GRB 200402B: BALROG localization (Fermi Trigger 607537834 / GRB 200402688)
  94. Fermi GRB 200401A: Global MASTER-Net observations report
  95. GRB 200325B: Mondy continued observations
  96. Fermi trigger No 606918292: Global MASTER-Net observations report
  97. Fermi trigger No 606799116: Global MASTER-Net observations report
  98. Fermi trigger No 606840801: Global MASTER-Net observations report
  99. Fermi trigger No 606681997: Global MASTER-Net observations report
  100. LIGO/Virgo S200316bj: no counterpart candidate in SVOM/GWAC-F30 observations

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