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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28120 results found.

  1. GRB 200524A: Assy optical observations
  2. IceCube-200523A: Upper limits from a search for additional neutrino events in IceCube
  3. GRB 200522A: Hubble Space Telescope Near-IR F160W Observations
  4. GRB 200524A: optical upper limits from further MITSuME Akeno observation
  5. GRB 200522A: Gemini North optical imaging
  6. GRB 200524A: AstroSat CZTI detection
  7. GRB 200524A: Further Liverpool Telescope observations
  8. Fermi-LAT Gamma-ray Observations of IceCube-190523A
  9. GRB200521A: ASIM observation
  10. GRB 200524A: KAIT Optical Observations
  11. GRB 200524A: MITSuME Akeno optical observation
  12. GRB 200524A: Swift-XRT afterglow detection
  13. GRB 200524A: OAJ multicolor afterglow detection
  14. GRB 200524A: Fermi GBM detection
  15. GRB 200524: Swift/UVOT observations missed the ZTF20abbiixp position
  16. GRB 200524A: CAHA multicolor afterglow detection
  17. GRB 200524A: Correction to the GCN 27800
  18. GRB 200524A: 3.6m DOT observations of the afterglow candidate ZTF20abbiixp
  19. GRB 200524A: GROWTH-India confirmation of optical afterglow
  20. GRB 200522A: Swift-BAT refined analysis
  21. GRB 200522A: LCO Optical Afterglow Detection
  22. GRB 200522A: 6 GHz VLA radio source detection
  23. GRB 200522A: Swift-XRT refined Analysis
  24. GRB 200522A: Swift/UVOT Upper Limits
  25. GRB 200522A: Enhanced Swift-XRT position
  26. GRB 200522A: Swift detection of a short burst
  27. GRB 200519A: Swift-BAT refined analysis
  28. GRB 200519A: Insight-HXMT/HE detection
  29. GRB 200519A: Swift/UVOT Detection
  30. GRB 200519A: GROWTH-India optical follow-up
  31. GRB 200519A: AstroSat CZTI detection
  32. GRB 200519A: Swift-XRT refined Analysis
  33. GRB 200519A: Enhanced Swift-XRT position
  34. GRB 200519A: LCO Optical Afterglow Detection
  35. Fermi GBM Sub-Threshold Detection of GRB 200517A
  36. GRB 200519A: iTelescope optical afterglow detection
  37. GRB 200519A: Swift detection of a burst with an optical afterglow
  38. GRB 200517A: Swift-XRT afterglow detection
  39. GRB 200517A: MAXI/GSC detection
  40. GRB 200514B: BALROG localization (Fermi Trigger 611140062 / GRB 200514380)
  41. Swift GRB200516.63: Global MASTER-Net observations report
  42. Swift Detection of a burst from SGR Swift J1818.0-1607
  43. GRB 200514B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 611140062) - More Candidates
  44. GRB 200514A: MITSuME Akeno optical upper limits
  45. GRB 200512A: Swift-BAT refined analysis
  46. GRB 200514B: GROWTH-India follow-up of ZTF20aazpphd (AT2020jww)
  47. GRB 200514A: MAXI/GSC detection
  48. Baksan Neutrino Observatory Alert 200512.: Global MASTER-Net observations report
  49. GRB 200512A: LCO Optical Upper Limits
  50. IceCube-200512A: Upper limits from a search for additional neutrino events in IceCube
  51. Fermi GBM Sub-Threshold Detection of GRB 200512A
  52. GRB 200512A: Swift/UVOT Upper Limits
  53. GRB 200512A: Swift-XRT refined Analysis
  54. GRB 200512A: Enhanced Swift-XRT position
  55. GRB 200512A: Swift detection of a burst
  56. Fermi-LAT Gamma-ray Observations of IceCube-200512A
  57. IceCube-200512A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  58. Insight-HXMT's continued observation plan for SGR J1935+2154
  59. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  60. IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT
  61. GRB 200509A: Swift-BAT refined analysis
  62. GRB 200510A: BALROG localization (Fermi Trigger 610800081 / GRB 200510445)
  63. GRB 200509A: GROWTH-India r band upper limits
  64. GRB 200509A: Swift/UVOT Detection
  65. GRB 200509A: LCO Optical Afterglow Detection
  66. GRB 200509A: Swift-XRT refined Analysis
  67. GRB 200509A: Enhanced Swift-XRT position
  68. GRB 200509A: Zadko observatory - Gingin optical upper limits
  69. GRB 200509A: Swift detection of a burst with a possible optical counterpart
  70. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  71. Swift Detection of a burst from SGR Swift J1818.0-1607
  72. Swift GRB200506.73: Global MASTER-Net observations report
  73. Insight-HXMT detection of a short bright burst from SGR 1935+2154
  74. GRB 200502A: AstroSat CZTI detection
  75. GRB 200503B: BALROG localization (Fermi Trigger 610219118 / GRB 200503721)
  76. Insight-HXMT X-ray and hard X-ray upper limits to the radio burst detected by FAST from SGR 1935+2154
  77. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  78. GRB 200424A: Swift-XRT afterglow detection
  79. Insight-HXMT X-ray and hard X-ray detection of the double peaks of the Fast Radio Burst from SGR 1935+2154
  80. Fermi GBM observation of a flare from the magnetar SGR 1806-20
  81. GRB 200501A: Fermi GBM Final Real-time Localization
  82. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  83. Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
  84. A Forest of Bursts from SGR 1935+2154
  85. SGR 1935+2154 the Insight-HXMT observation plan
  86. IceCube-200425A: No significant detection in HAWC
  87. IceCube-200425A: Upper limits from a search for additional neutrino events in IceCube
  88. Fermi-LAT Gamma-ray Observations of IceCube-200425A
  89. IceCube-200425A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  90. GRB 200425A: Swift-BAT refined analysis
  91. GRB 200424A: Swift/UVOT Upper Limits
  92. GRB 200425A: LCO Optical Upper Limits
  93. GRB 200425A: Swift/UVOT Upper Limits
  94. GRB 200424A: AstroSat CZTI detection
  95. GRB 200425A: Swift-XRT refined Analysis
  96. GRB 200424A: Swift-XRT observations
  97. GRB 200425A: Enhanced Swift-XRT position
  98. GRB 200425A: Swift detection of a burst
  99. GRB 200424A: LCO Optical Upper Limit
  100. IPN Triangulation of a bright burst from SGR 1935+2154

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