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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"

21094 results found.

  1. Fermi trigger No 584007338 Global MASTER-Net observations report
  2. IceCube-190704A: Upper limits from Insight-HXMT/HE observations
  3. Fermi-LAT Gamma-ray Observations of IceCube-190704A and detection of the new gamma-ray source 1WHSP J104516.2+275133
  4. GRB 190627A: Discovery Channel Telescope late time observations
  5. IceCube Alert 190704.78 Global MASTER-Net observations report
  6. Baksan Neutrino Observatory Alert 190703.21 Global MASTER-Net observations report
  7. Baksan Neutrino Observatory Alert 190703.56 Global MASTER-Net observations report
  8. Fermi trigger No 583854113 Global MASTER-Net observations report
  9. LIGO/Virgo S190630ag: no counterpart candidate in the SVOM/GWAC observations
  10. LIGO/Virgo S190701ah: No transient candidates from CALET observations
  11. LIGO/Virgo S190701ah: Upper limits from Insight-HXMT/HE observations
  12. Fermi-LAT Gamma-ray Observations of IceCube-190629A
  13. LIGO/Virgo S190701ah: No counterpart candidates in the Swift/BAT Observations
  14. LIGO/Virgo S190701ah: Upper limits from AGILE-GRID observations
  15. LIGO/Virgo S190630ag: Upper limits from Insight-HXMT/HE observations
  16. LIGO/Virgo S190701ah: Upper limits from Fermi-GBM Observations
  17. LIGO/Virgo S190630ag: Upper limits from CALET observations
  18. LIGO/Virgo S190701ah Global MASTER-Net observations report
  19. LIGO/Virgo S190701ah: Coverage and upper limits from MAXI/GSC observations
  20. GRB 190701A: Swift/UVOT Upper Limits
  21. LIGO/Virgo S190701ah: No counterpart candidates in AGILE-MCAL observations
  22. GRB 190701A: COATLI Optical Observations
  23. GRB 190630C: Swift/UVOT Upper Limits
  24. GRB 190630C: KAIT Optical Upper Limit
  25. GRB 190630B: Swift/UVOT Upper Limits
  26. LIGO/Virgo S190630ag: No counterpart candidates in AGILE-GRID observations
  27. LIGO/Virgo S190630ag: No counterpart candidates in the Swift/BAT Observations
  28. LIGO/Virgo S190630ag: No counterpart candidates in AGILE-MCAL observations
  29. LIGO/Virgo S190630ag: No counterpart candidates in Fermi-LAT observations
  30. GRB 190630B: KAIT Optical Afterglow Confirmation
  31. Swift GRB190631. Global MASTER-Net observations report
  32. LIGO/Virgo S190630ag: Upper limits from Fermi-GBM Observations
  33. LIGO/Virgo S190630ag: Coverage and upper limits from MAXI/GSC observations
  34. LIGO/Virgo S190630ag: No counterpart candidates in HAWC observations
  35. LIGO/Virgo S190630ag Global MASTER-Net observations report
  36. IceCube-190629A: Upper limits from Fermi-GBM Observations
  37. GRB 190627A: VLT/FORS2 spectroscopic redshift
  38. Fermi trigger No 583567803 Global MASTER-Net observations report
  39. GRB 190627A: Koshka Zeiss-1000 optical counterpart observations
  40. Baksan Neutrino Observatory Alert 190629.56 Global MASTER-Net observations report
  41. IceCube Alert 190629.81 Global MASTER-Net observations report
  42. GRB 190627A : Xinglong 2.16m optical observation
  43. GRB 190627A: GMG observation at the second epoch
  44. GRB 190627A: NOT optical observations
  45. GRB 190627A: Optical imaging and spectroscopy from Calar Alto
  46. GRB 190627A: NUTTelA-TAO optical counterpart observations
  47. GRB 190610A: Further Swift-XRT observations
  48. GRB 190627A: MASTER optical counterpart observation
  49. GRB190627A: VIRT Afterglow observation
  50. GRB 190627A: Montarrenti Observatory optical detection
  51. GRB 190627A: NUTTelA-TAO optical observations
  52. Fermi trigger No 583327924 Global MASTER-Net observations report
  53. GRB 190627A: Swift/UVOT Detection
  54. Fermi trigger No 583245413 Global MASTER-Net observations report
  55. Fermi trigger No 583245413 Global MASTER-Net observations report
  56. Fermi trigger No 583221986 Global MASTER-Net observations report
  57. Fermi trigger No 583111521 Global MASTER-Net observations report
  58. Swift GRB190624.86 Global MASTER-Net observations report
  59. Fermi trigger No 582886211 Global MASTER-Net observations report
  60. Fermi trigger No 582856902 Global MASTER-Net observations report
  61. Fermi trigger No 582748289 Global MASTER-Net observations report
  62. Fermi trigger No 582759998 Global MASTER-Net observations report
  63. Fermi-LAT Gamma-ray Observations of IceCube-190619A
  64. LIGO/Virgo S190426c: Swift UVOT - no new counterpart candidates identified
  65. LIGO/Virgo S190510g: Swift UVOT - no new counterpart candidates identified
  66. Fermi trigger No 582615488 Global MASTER-Net observations report
  67. Fermi trigger No 582615488 Global MASTER-Net observations report
  68. Fermi trigger No 582646590 Global MASTER-Net observations report
  69. GRB 190613A: SEDM Observations
  70. Fermi trigger No 582596766 Global MASTER-Net observations report
  71. GRB 190613B: JCMT SCUBA-2 sub-mm observations
  72. Fermi trigger No 582304592 Global MASTER-Net observations report
  73. Fermi trigger No 582159815 Global MASTER-Net observations report
  74. GRB 190613B: SEDM Observations
  75. GRB 190613A: SEDM Observations
  76. GRB 190610A: Swift/UVOT Upper Limits
  77. GRB 190610A: Swift-XRT observations
  78. GRB 190613B: GROND Detection of the Optical/NIR Afterglow
  79. GRB 190613B: BOOTES-5/JGT early optical observations
  80. GRB 190613B: Optical observations from NOT
  81. Fermi trigger No 582115625 Global MASTER-Net observations report
  82. GRB 190610A: Swift ToO observations
  83. GRB 190613B: KAIT Optical Afterglow Confirmation
  84. GRB 190613B: Swift/UVOT Detection
  85. GRB 190613A: Swift/UVOT Detection
  86. Swift GRB190613.17 Global MASTER-Net observations report
  87. GRB 190613A: KAIT Optical Afterglow Confirmation
  88. Fermi trigger No 582091643 Global MASTER-Net observations report
  89. Fermi trigger No 582012834 Global MASTER-Net observations report
  90. Fermi trigger No 581986074 Global MASTER-Net observations report
  91. GRB 190611A: Swift/UVOT Upper Limits
  92. GRB 190611A: Optical observations from VLT/FORS2
  93. Fermi trigger No 582004649 Global MASTER-Net observations report
  94. Fermi trigger No 581889628 Global MASTER-Net observations report
  95. Fermi trigger No 581882394 Global MASTER-Net observations report
  96. Fermi trigger No 581841498 Global MASTER-Net observations report
  97. Fermi trigger No 581719018 Global MASTER-Net observations report
  98. Fermi trigger No 581645543 Global MASTER-Net observations report
  99. LIGO/Virgo S190425z: Swift UVOT - no new sources identified, and a summary of the Swift UVOT processing of GW triggers.
  100. GRB 190114C: East Asia VLBI Network observations

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