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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"

21114 results found.

  1. Fermi GRB 200607A: Global MASTER-Net observations report
  2. Fermi GRB 200605A: Global MASTER-Net observations report
  3. GRB 200530A: Fermi-LAT detection
  4. Fermi trigger No 612988790: Global MASTER-Net observations report
  5. Fermi GRB 200604A: Global MASTER-Net observations report
  6. Swift detection of an SGR-like burst from 1RXS J1708−4009
  7. Baksan Neutrino Observatory Alert 200603.12: Global MASTER-Net observations report
  8. GRB 200529A: Swift/UVOT Upper Limits
  9. Baksan Neutrino Observatory Alert 200601.42: Global MASTER-Net observations report
  10. Fermi-LAT Gamma-ray Observations of IceCube-200530A
  11. Fermi GRB 200601A: Global MASTER-Net observations report
  12. IceCube-200530A: not observable by Fermi-GBM
  13. Fermi GRB 200531A: Global MASTER-Net observations report
  14. IceCube-200530A: Candidate Counterparts from the Zwicky Transient Facility
  15. IceCube Alert 200530.33: Global MASTER-Net observations report
  16. Fermi GRB 200530A: Global MASTER-Net observations report
  17. Fermi GRB 200529B: Global MASTER-Net observations report
  18. Fermi trigger No 612429771: Global MASTER-Net observations report
  19. GRB 200524A: SAO RAS optical observations
  20. GRB 200524A: Assy continued optical observations
  21. Swift GRB200529.04: Global MASTER-Net observations report
  22. GRB 200528A: NOT optical upper limits
  23. GRB 200528A: Swift/UVOT Upper Limits
  24. Swift GRB 200528A: Global MASTER-Net observations report
  25. GRB 200524A: Assy optical observations
  26. Baksan Neutrino Observatory Alert 200526.85: Global MASTER-Net observations report
  27. GRB 200522A: HST F125W new point source detection
  28. GRB 200522A: Hubble Space Telescope Near-IR F160W Observations
  29. GRB200524A: UVOT detection
  30. Fermi GRB 200525A: Global MASTER-Net observations report
  31. GRB 200522A: Gemini North optical imaging
  32. GRB 200524A: CrAO optical observations
  33. GRB 200524A: Kitab observatory afterglow observations
  34. GRB 200524A: Further Liverpool Telescope observations
  35. Fermi-LAT Gamma-ray Observations of IceCube-190523A
  36. GRB 200524A: KAIT Optical Observations
  37. GRB 171205A: ATCA observations of late-time radio emission
  38. GRB 200524A: Swift-XRT afterglow detection
  39. GRB 200524A: OAJ multicolor afterglow detection
  40. GRB 200524: Swift/UVOT observations missed the ZTF20abbiixp position
  41. GRB 200524A: CAHA multicolor afterglow detection
  42. GRB 200524A: Liverpool Telescope observations
  43. GRB 200524A: 3.6m DOT observations of the afterglow candidate ZTF20abbiixp
  44. GRB 200524A: CrAO observations of ZTF20abbiixp
  45. Fermi GRB 200524A: Global MASTER-Net observations report
  46. ZTF Discovery of ZTF20abbiixp: The Likely Optical Afterglow to GRB 200524A
  47. GRB 200524A: Swift ToO observations
  48. GRB 200524A: Fermi-LAT detection
  49. GRB 200522A: Correction to GCN 27792
  50. IceCube-200523A: Upper limits from Fermi-GBM Observations
  51. Swift GRB 200522A: Global MASTER-Net observations report
  52. IceCube Alert 200523.10: Global MASTER-Net observations report
  53. GRB 200522A: 6 GHz VLA radio source detection
  54. GRB 200522A: BOOTES-3/YA optical upper limit
  55. GRB 200522A: Swift/UVOT Upper Limits
  56. Fermi GRB 200522B: Global MASTER-Net observations report
  57. GRB 200519A: R-band follow-up from HCT
  58. GRB 200519A: Swift/UVOT Detection
  59. Fermi trigger No 611676654: Global MASTER-Net observations report
  60. GRB 200519A: GROWTH-India optical follow-up
  61. Swift GRB 200519A: Global MASTER-Net observations report
  62. Fermi trigger No 611605955: Global MASTER-Net observations report
  63. GRB 200519A: BOOTES-3/YA optical counterpart observations
  64. GRB 200517A: Swift-XRT afterglow detection
  65. Fermi trigger No 611434353: Global MASTER-Net observations report
  66. GRB 200517A: Tiled Swift observations
  67. Swift GRB200516.63: Global MASTER-Net observations report
  68. GRB 200514A: MITSuME Akeno optical upper limits
  69. GRB200514B: YSE detection of ZTF20aazpphd
  70. Optical transient ZTF20aazpphd is unrelated to GRB 200514B
  71. GRB 200514A: MAXI/GSC detection
  72. Baksan Neutrino Observatory Alert 200512.: Global MASTER-Net observations report
  73. GRB 200512A: Swift/UVOT Upper Limits
  74. Fermi-LAT Gamma-ray Observations of IceCube-200512A
  75. IceCube Alert 200512.31: Global MASTER-Net observations report
  76. IceCube-200512A: No Candidate Counterparts from the Zwicky Transient Facility
  77. Insight-HXMT's continued observation plan for SGR J1935+2154
  78. Baksan Neutrino Observatory Alert 200511.76: Global MASTER-Net observations report
  79. GRB 200509A: Swift/UVOT Detection
  80. Swift GRB 200509A: Global MASTER-Net observations report
  81. GRB 200509A: Zadko observatory - Gingin optical upper limits
  82. Swift Detection of a burst from SGR Swift J1818.0-1607
  83. Swift GRB200506.73: Global MASTER-Net observations report
  84. GRB 200422A: INTEGRAL observations
  85. GRB 200503A: AGILE observations
  86. GRB 200502A: AGILE observations
  87. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  88. GRB 200424A: Swift-XRT afterglow detection
  89. Fermi GBM trigger 200429866/609886052 is not a GRB
  90. SGR 1935+2154: MASTER optical observations
  91. Integral GRB200428.61: Global MASTER-Net observations report
  92. high bursting activity of SGR 1935+2154: CGBM observations
  93. SGR 1935+2154 the Insight-HXMT observation plan
  94. Swift detection of multiple bursts from SGR 1935+2154
  95. IceCube-200425A: Upper limits from Fermi-GBM Observations
  96. Fermi-LAT Gamma-ray Observations of IceCube-200425A
  97. Gagarin-day GRB 200412B: observations with the 3.6m Devasthal Optical Telescope
  98. IceCube Alert 200425.98: Global MASTER-Net observations report
  99. GRB 200424A: Swift/UVOT Upper Limits
  100. Swift GRB 200425A: Global MASTER-Net observations report

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