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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"

26364 results found.

  1. IceCube-200512A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  2. Insight-HXMT's continued observation plan for SGR J1935+2154
  3. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  4. IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT
  5. GRB 200509A: Swift-BAT refined analysis
  6. GRB 200510A: BALROG localization (Fermi Trigger 610800081 / GRB 200510445)
  7. GRB 200509A: GROWTH-India r band upper limits
  8. GRB 200509A: Swift/UVOT Detection
  9. GRB 200509A: LCO Optical Afterglow Detection
  10. GRB 200509A: Swift-XRT refined Analysis
  11. GRB 200509A: Enhanced Swift-XRT position
  12. GRB 200509A: Zadko observatory - Gingin optical upper limits
  13. GRB 200509A: Swift detection of a burst with a possible optical counterpart
  14. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  15. Swift Detection of a burst from SGR Swift J1818.0-1607
  16. Swift GRB200506.73: Global MASTER-Net observations report
  17. Insight-HXMT detection of a short bright burst from SGR 1935+2154
  18. GRB 200502A: AstroSat CZTI detection
  19. GRB 200503B: BALROG localization (Fermi Trigger 610219118 / GRB 200503721)
  20. Insight-HXMT X-ray and hard X-ray upper limits to the radio burst detected by FAST from SGR 1935+2154
  21. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  22. GRB 200424A: Swift-XRT afterglow detection
  23. Insight-HXMT X-ray and hard X-ray detection of the double peaks of the Fast Radio Burst from SGR 1935+2154
  24. Fermi GBM observation of a flare from the magnetar SGR 1806-20
  25. GRB 200501A: Fermi GBM Final Real-time Localization
  26. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  27. Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
  28. A Forest of Bursts from SGR 1935+2154
  29. SGR 1935+2154 the Insight-HXMT observation plan
  30. IceCube-200425A: No significant detection in HAWC
  31. IceCube-200425A: Upper limits from a search for additional neutrino events in IceCube
  32. Fermi-LAT Gamma-ray Observations of IceCube-200425A
  33. IceCube-200425A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  34. GRB 200425A: Swift-BAT refined analysis
  35. GRB 200424A: Swift/UVOT Upper Limits
  36. GRB 200425A: LCO Optical Upper Limits
  37. GRB 200425A: Swift/UVOT Upper Limits
  38. GRB 200424A: AstroSat CZTI detection
  39. GRB 200425A: Swift-XRT refined Analysis
  40. GRB 200424A: Swift-XRT observations
  41. GRB 200425A: Enhanced Swift-XRT position
  42. GRB 200425A: Swift detection of a burst
  43. GRB 200424A: LCO Optical Upper Limit
  44. IPN Triangulation of a bright burst from SGR 1935+2154
  45. IceCube-200421A: Upper limits from a search for additional neutrino events in IceCube
  46. GRB 200415A: ASIM observation
  47. GRB 200410A: Liverpool Telescope First Hour Observations
  48. Fermi-LAT Gamma-ray Observations of IceCube-200421A
  49. IceCube-200421A: No Neutrino Counterpart in ANTARES data
  50. IceCube-200421A: No significant detection in HAWC
  51. IceCube-200421A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  52. GRB 200412B: continued Mondy and Terskol optical observations
  53. GRB 200412B: continued Terskol optical observations
  54. GRB 200412B: continued AbAO, Mondy, TSHAO, Terskol optical observations
  55. GRB 200410A: Optical upper limit
  56. GRB 200416A: Swift/UVOT Detection
  57. GRB 200416A: Swift-BAT refined analysis
  58. GRB 200412B: Swift XRT confirmation of afterglow and UVOT upper limits
  59. GRB 200415A: MASTER imspection and possible localisation
  60. GRB200412B: GROWTH India detection of afterglow
  61. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  62. GRB 200416A: Swift-XRT refined Analysis
  63. GRB 200412B: continued Tautenburg observations
  64. GRB 200416A: Fermi GBM observation
  65. GRB 200416A: Swift detection of a burst with an optical afterglow
  66. GRB 200415A: Fermi GBM observation
  67. IPN triangulation of GRB 200415A (possible Magnetar Giant Flare in Sculptor Galaxy?)
  68. GRB 200412B: Mondy optical observations
  69. GRB 200412B: continued Tautenburg observations
  70. GRB 200415A: BALROG localization (Fermi Trigger 608633290 / GRB 200415367)
  71. GRB 200410A: Swift-BAT refined analysis
  72. GRB 200412B: Tautenburg observations
  73. GRB 200412B: contunued AbAO optical observations
  74. GRB 200412B: SAO RAS observations of OT
  75. IceCube-200410A: No significant detection in HAWC
  76. GRB 200412B: Tautenburg observations
  77. GRB 200412B: AbAO optical observations
  78. GRB 200412B: Insight-HXMT/HE detection
  79. IceCube-200410A : Upper limits from Insight-HXMT/HE observations
  80. GRB 200412B: Swift-XRT afterglow detection
  81. Fermi GRB 200412A: Global MASTER-Net observations report
  82. GRB 200412B: Fermi GBM detection
  83. IceCube-200410A: Upper limits from a search for additional neutrino events in IceCube
  84. GRB 200412A: Fermi GBM detection
  85. GRB 200412B: BALROG localization (Fermi Trigger 608375325 / GRB 200412381)
  86. GRB 200412A: BALROG localization (Fermi Trigger 608367436 / GRB 200412290)
  87. GRB 200411A: Swift-BAT refined analysis
  88. Fermi-LAT Gamma-ray Observations of IceCube-200410A
  89. GRB 200411A: Swift-XRT refined Analysis
  90. GRB 200411A: Swift/UVOT Upper Limits
  91. GRB 200411A: Enhanced Swift-XRT position
  92. IceCube-200410A: Possible associated excess in INTEGRAL SPI-ACS prompt observation
  93. GRB 200411A: Swift detection of a short burst
  94. GRB 200410A: Swift/UVOT Detection
  95. LIGO/Virgo S200225q: Swift XRT observations, 1 X-ray sources
  96. LIGO/Virgo S200224ca: Swift XRT observations, 8 X-ray sources
  97. GRB 200410A: Swift-XRT refined Analysis
  98. GRB 200410A: Enhanced Swift-XRT position
  99. GRB 200409A: Swift-BAT refined analysis
  100. GRB 200410A: Swift detection of a burst with a possible optical counterpart

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