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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"

4253 results found.

  1. Fermi GRB 200605A: Global MASTER-Net observations report
  2. Swift detection of an SGR-like burst from 1RXS J1708−4009
  3. IceCube-200530A: Upper limits from a search for additional neutrino events in IceCube
  4. Baksan Neutrino Observatory Alert 200601.42: Global MASTER-Net observations report
  5. Fermi GRB 200531A: Global MASTER-Net observations report
  6. IceCube-200530A: No significant detection in HAWC
  7. IceCube-200530A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  8. GRB 200530A: AstroSat CZTI detection
  9. Fermi GRB 200530A: Global MASTER-Net observations report
  10. GRB 200529A: LCO Optical Afterglow Detection
  11. Fermi GRB 200529B: Global MASTER-Net observations report
  12. Fermi trigger No 612429771: Global MASTER-Net observations report
  13. GRB 200529B: Fermi GBM Final Real-time Localization
  14. GRB 200524A: Assy continued optical observations
  15. GRB 200529A: Fermi GBM Final Real-time Localization
  16. Swift GRB200529.04: Global MASTER-Net observations report
  17. Fermi GRB 200524A: Global MASTER-Net observations report
  18. Fermi GRB 200522B: Global MASTER-Net observations report
  19. Fermi trigger No 611676654: Global MASTER-Net observations report
  20. Fermi trigger No 611434353: Global MASTER-Net observations report
  21. Swift J1818.0-1607: BOOTES-3/YA optical upper limit
  22. Swift Detection of a burst from SGR Swift J1818.0-1607
  23. AGILE detection of a burst from SGR 1935+2154 on May 10, 2020
  24. SGR 1935+2154: AstroSat CZTI detection
  25. Insight-HXMT's continued observation plan for SGR J1935+2154
  26. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  27. IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT
  28. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  29. Swift Detection of a burst from SGR Swift J1818.0-1607
  30. Swift GRB200506.73: Global MASTER-Net observations report
  31. Insight-HXMT detection of a short bright burst from SGR 1935+2154
  32. AGILE detection of a short and hard X-ray burst possibly related to SGR 1935+2154
  33. Geocentric time correction for Insight-HXMT detection of the x-ray counterpart of the FRB by CHIME and STARE2 from SGR 1935+2154
  34. Insight-HXMT X-ray and hard X-ray upper limits to the radio burst detected by FAST from SGR 1935+2154
  35. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  36. Insight-HXMT X-ray and hard X-ray detection of the double peaks of the Fast Radio Burst from SGR 1935+2154
  37. Fermi GBM observation of a flare from the magnetar SGR 1806-20
  38. Trigger 968731: Swift detection of SGR1806-20
  39. Fermi GBM trigger 200429866/609886052 is not a GRB
  40. SGR 1935+2154: MASTER optical observations
  41. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154
  42. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  43. Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
  44. A Forest of Bursts from SGR 1935+2154
  45. SGR 1935+2154: AstroSat CZTI detections
  46. high bursting activity of SGR 1935+2154: CGBM observations
  47. SGR 1935+2154 the Insight-HXMT observation plan
  48. SGR 1935+2154: MAXI/GSC detection
  49. Fermi GBM observation of a bright flare from magnetar SGR 1935+2154
  50. Swift detection of multiple bursts from SGR 1935+2154
  51. Gagarin-day GRB 200412B: observations with the 3.6m Devasthal Optical Telescope
  52. Fermi GRB 200423A: Global MASTER-Net observations report
  53. Konus-Wind observation of a bright burst from SGR 1935+2154
  54. GRB 200415A (possible magnetar Giant Flare in Sculptor Galaxy): INTEGRAL observations
  55. IPN Triangulation of a bright burst from SGR 1935+2154
  56. bright SGR burst detected by CALET Gamma-Ray Burst Monitor
  57. Fermi trigger No 608935505: Global MASTER-Net observations report
  58. GRB 200410A: Optical upper limit
  59. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  60. Fermi GRB 200415A: Global MASTER-Net observations report
  61. GRB 200412B: Tautenburg observations
  62. GRB 200412B: Optical afterglow detection with 1.3m DFOT
  63. Konus-Wind observation of a bright burst from SGR 1935+2154
  64. GRB 200411A: Fermi GBM observation
  65. GRB 200411A: Swift detection of a short burst
  66. GRB 200411A: Fermi GBM Final Real-time Localization
  67. IceCube Alert 200410.97: Global MASTER-Net observations report
  68. SGR 1935+2154: Fermi GBM observation
  69. Fermi trigger No 608204639: Global MASTER-Net observations report
  70. IPN Triangulation of a bright burst from SGR 1935+2154
  71. Baksan Neutrino Observatory Alert 200409.23: Global MASTER-Net observations report
  72. Fermi GRB 200407B: Global MASTER-Net observations report
  73. Baksan Neutrino Observatory Alert 200406.3: Global MASTER-Net observations report
  74. GRB 200405B: LCO Optical Upper Limits
  75. Fermi GRB 200403C: Global MASTER-Net observations report
  76. Fermi GRB 200402C: Global MASTER-Net observations report
  77. GRB 200402B: BALROG localization (Fermi Trigger 607537834 / GRB 200402688)
  78. Fermi GRB 200401A: Global MASTER-Net observations report
  79. GRB 200325B: Mondy continued observations
  80. Fermi trigger No 606918292: Global MASTER-Net observations report
  81. Fermi trigger No 606799116: Global MASTER-Net observations report
  82. Fermi trigger No 606840801: Global MASTER-Net observations report
  83. Fermi trigger No 606681997: Global MASTER-Net observations report
  84. LIGO/Virgo S200316bj: no counterpart candidate in SVOM/GWAC-F30 observations
  85. Fermi trigger No 606263732: Global MASTER-Net observations report
  86. LIGO/Virgo S200316bj : No significant candidates in TAROT - FRAM - GRANDMA observations.
  87. LIGO/Virgo S200316bj: no counterpart candidate in SVOM/GWAC observations
  88. LIGO/Virgo S200213t: Continued Swift UVOT and XRT observations of ZTF20aamvmzj (AT2020cja)
  89. LIGO/Virgo S200316bj: Upper limits from IceCube neutrino searches
  90. SGR Swift J1818.0-1607: Swift-BAT refined analysis
  91. IPN triangulation of GRB 200311A
  92. SGR Swift J1818.0-1607: BOOTES-4/MET optical limit
  93. Fermi trigger No 605756501: Global MASTER-Net observations report
  94. Swift-BAT trigger 960986: Swift detection of a new SGR Swift J1818.0-1607
  95. LIGO/Virgo S200311bg: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
  96. LIGO/Virgo S200311bg: Upper limits from IceCube neutrino searches
  97. Fermi trigger No 605309224: Global MASTER-Net observations report
  98. LIGO/Virgo S200302c : No significant candidates in FRAM - TAROT - GRANDMA observations.
  99. LIGO/Virgo S200302c: AstroSat CZTI upper limits
  100. GRB200210A AstroSat observations

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