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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"

21120 results found.

  1. Fermi trigger No 613630183: Global MASTER-Net observations report
  2. Swift GRB200612.19: Global MASTER-Net observations report
  3. Swift GRB 200608A: Global MASTER-Net observations report
  4. GRB 200608A: BOOTES-3 and BOOTES-4 optical upper limit
  5. GRB 200522A: Further HST F125W Observations
  6. Fermi GRB 200607B: Global MASTER-Net observations report
  7. Fermi GRB 200607A: Global MASTER-Net observations report
  8. Fermi GRB 200605A: Global MASTER-Net observations report
  9. GRB 200530A: Fermi-LAT detection
  10. Fermi trigger No 612988790: Global MASTER-Net observations report
  11. Fermi GRB 200604A: Global MASTER-Net observations report
  12. Swift detection of an SGR-like burst from 1RXS J1708−4009
  13. Baksan Neutrino Observatory Alert 200603.12: Global MASTER-Net observations report
  14. GRB 200529A: Swift/UVOT Upper Limits
  15. Baksan Neutrino Observatory Alert 200601.42: Global MASTER-Net observations report
  16. Fermi-LAT Gamma-ray Observations of IceCube-200530A
  17. Fermi GRB 200601A: Global MASTER-Net observations report
  18. IceCube-200530A: not observable by Fermi-GBM
  19. Fermi GRB 200531A: Global MASTER-Net observations report
  20. IceCube-200530A: Candidate Counterparts from the Zwicky Transient Facility
  21. IceCube Alert 200530.33: Global MASTER-Net observations report
  22. Fermi GRB 200530A: Global MASTER-Net observations report
  23. Fermi GRB 200529B: Global MASTER-Net observations report
  24. Fermi trigger No 612429771: Global MASTER-Net observations report
  25. GRB 200524A: SAO RAS optical observations
  26. GRB 200524A: Assy continued optical observations
  27. Swift GRB200529.04: Global MASTER-Net observations report
  28. GRB 200528A: NOT optical upper limits
  29. GRB 200528A: Swift/UVOT Upper Limits
  30. Swift GRB 200528A: Global MASTER-Net observations report
  31. GRB 200524A: Assy optical observations
  32. Baksan Neutrino Observatory Alert 200526.85: Global MASTER-Net observations report
  33. GRB 200522A: HST F125W new point source detection
  34. GRB 200522A: Hubble Space Telescope Near-IR F160W Observations
  35. GRB200524A: UVOT detection
  36. Fermi GRB 200525A: Global MASTER-Net observations report
  37. GRB 200522A: Gemini North optical imaging
  38. GRB 200524A: CrAO optical observations
  39. GRB 200524A: Kitab observatory afterglow observations
  40. GRB 200524A: Further Liverpool Telescope observations
  41. Fermi-LAT Gamma-ray Observations of IceCube-190523A
  42. GRB 200524A: KAIT Optical Observations
  43. GRB 171205A: ATCA observations of late-time radio emission
  44. GRB 200524A: Swift-XRT afterglow detection
  45. GRB 200524A: OAJ multicolor afterglow detection
  46. GRB 200524: Swift/UVOT observations missed the ZTF20abbiixp position
  47. GRB 200524A: CAHA multicolor afterglow detection
  48. GRB 200524A: Liverpool Telescope observations
  49. GRB 200524A: 3.6m DOT observations of the afterglow candidate ZTF20abbiixp
  50. GRB 200524A: CrAO observations of ZTF20abbiixp
  51. Fermi GRB 200524A: Global MASTER-Net observations report
  52. ZTF Discovery of ZTF20abbiixp: The Likely Optical Afterglow to GRB 200524A
  53. GRB 200524A: Swift ToO observations
  54. GRB 200524A: Fermi-LAT detection
  55. GRB 200522A: Correction to GCN 27792
  56. IceCube-200523A: Upper limits from Fermi-GBM Observations
  57. Swift GRB 200522A: Global MASTER-Net observations report
  58. IceCube Alert 200523.10: Global MASTER-Net observations report
  59. GRB 200522A: 6 GHz VLA radio source detection
  60. GRB 200522A: BOOTES-3/YA optical upper limit
  61. GRB 200522A: Swift/UVOT Upper Limits
  62. Fermi GRB 200522B: Global MASTER-Net observations report
  63. GRB 200519A: R-band follow-up from HCT
  64. GRB 200519A: Swift/UVOT Detection
  65. Fermi trigger No 611676654: Global MASTER-Net observations report
  66. GRB 200519A: GROWTH-India optical follow-up
  67. Swift GRB 200519A: Global MASTER-Net observations report
  68. Fermi trigger No 611605955: Global MASTER-Net observations report
  69. GRB 200519A: BOOTES-3/YA optical counterpart observations
  70. GRB 200517A: Swift-XRT afterglow detection
  71. Fermi trigger No 611434353: Global MASTER-Net observations report
  72. GRB 200517A: Tiled Swift observations
  73. Swift GRB200516.63: Global MASTER-Net observations report
  74. GRB 200514A: MITSuME Akeno optical upper limits
  75. GRB200514B: YSE detection of ZTF20aazpphd
  76. Optical transient ZTF20aazpphd is unrelated to GRB 200514B
  77. GRB 200514A: MAXI/GSC detection
  78. Baksan Neutrino Observatory Alert 200512.: Global MASTER-Net observations report
  79. GRB 200512A: Swift/UVOT Upper Limits
  80. Fermi-LAT Gamma-ray Observations of IceCube-200512A
  81. IceCube Alert 200512.31: Global MASTER-Net observations report
  82. IceCube-200512A: No Candidate Counterparts from the Zwicky Transient Facility
  83. Insight-HXMT's continued observation plan for SGR J1935+2154
  84. Baksan Neutrino Observatory Alert 200511.76: Global MASTER-Net observations report
  85. GRB 200509A: Swift/UVOT Detection
  86. Swift GRB 200509A: Global MASTER-Net observations report
  87. GRB 200509A: Zadko observatory - Gingin optical upper limits
  88. Swift Detection of a burst from SGR Swift J1818.0-1607
  89. Swift GRB200506.73: Global MASTER-Net observations report
  90. GRB 200422A: INTEGRAL observations
  91. GRB 200503A: AGILE observations
  92. GRB 200502A: AGILE observations
  93. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  94. GRB 200424A: Swift-XRT afterglow detection
  95. Fermi GBM trigger 200429866/609886052 is not a GRB
  96. SGR 1935+2154: MASTER optical observations
  97. Integral GRB200428.61: Global MASTER-Net observations report
  98. high bursting activity of SGR 1935+2154: CGBM observations
  99. SGR 1935+2154 the Insight-HXMT observation plan
  100. Swift detection of multiple bursts from SGR 1935+2154

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