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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"

8520 results found.

  1. GRB 190129B: GROND possible host candidate
  2. GRB 190129B: Swift-XRT candidate afterglow detection
  3. GRB 190129B: Tiled Swift observations
  4. INTEGRAL observation of IceCube-190124A
  5. Trigger 886266: Another Swift trigger on MAXI J1348-630
  6. GRB 190114C: Optical follow-up from HCT
  7. Swift Trigger 885960: A third Swift trigger on MAXI J1348-630
  8. Search for counterparts to IceCube-190124A with IceCube
  9. Search for counterpart to IceCube-190124A with ANTARES
  10. IceCube-190124A - IceCube observation of a high-energy neutrino candidate event
  11. Konus-Wind observation of GRB 190122A
  12. GRB 190123A: Swift detection of a burst
  13. GRB 190122A: Fermi GBM observation
  14. Trigger 884906: Swift detection of MAXI J1631-479
  15. GRB 190114C: MeerKAT radio observation
  16. GRB 190114C: Optical detection from HCT
  17. GRB190114C, Long follow up urged
  18. INTEGRAL observation of IceCube-190104A
  19. GRB 190114C: Swift detection of a very bright burst with a bright optical counterpart
  20. GRB 190114B: Swift detection of a burst
  21. GRB 190114A: Possible UVOT Detection
  22. GRB 190114A: Swift detection of a burst
  23. GRB 190109B: Swift detection of a burst
  24. GRB 190109A: Swift detection of a burst
  25. IceCube-190104A: Swift-XRT observations
  26. GRB 190106A: Swift-BAT refined analysis
  27. GRB 190106A: Swift detection of a burst with an optical counterpart
  28. Search for Counterparts to IceCube-190104A with IceCube
  29. Search for counterpart to IceCube-190104A with ANTARES
  30. IceCube-190104A - IceCube observation of a high-energy neutrino candidate event
  31. GRB 190103B: Swift detection of a burst
  32. GRB 181225A: KAIT Follow-Up Observations with Upper Limit
  33. GRB 181228A: KAIT Optical Upper Limit
  34. GRB 181228A: Swift detection of a burst
  35. GRB 181222B: Swift ToO observations
  36. GRB 181225A: Swift observations and X-ray candidate afterglow
  37. GRB 181225A: Swift ToO observations
  38. Swift Trigger 878504 is not astrophysical
  39. GRB 181126A: MeerKAT radio observation
  40. GRB181213A: Swift/UVOT Detection
  41. Swift Trigger 874754 is likely not an astrophysical event
  42. Fermi-GBM Observations During Four New GW-Detected BBH Mergers (Correction)
  43. Fermi-GBM Observations During Four New GW-Detected BBH Mergers
  44. GRB 181203A: Swift detection of a burst
  45. GRB 181201A: GROND detection of the afterglow and redshift upper limit of z < 3
  46. GRB 181202A: Swift detection of a burst with an optical counterpart
  47. GRB 181201A: Swift ToO observations
  48. GRB 181126A: Swift detection of a burst
  49. GRB 181123B: Keck near-infrared imaging
  50. GRB 181123B: Swift detection of a short burst
  51. Swift Trigger 872470 is probably not a GRB
  52. GRB 181110A: Swift detection of a burst with an optical counterpart
  53. Swift Trigger 871103 is not an astrophysical event
  54. Fermi GRB 181105.31: Global MASTER Net optical observations
  55. GRB 181103A: Swift detection of a burst
  56. IceCube-181023A: HAWC follow-up
  57. Search for counterparts to IceCube-181023A with IceCube
  58. Fermi-LAT Gamma-ray Observations of IceCube-181023A
  59. IceCube-181023A - IceCube observation of a high-energy neutrino candidate event
  60. GRB 181023A: KAIT Optical Upper Limit
  61. GRB 181023A: Swift detection of a burst
  62. GRB 181022A: Swift detection of a burst
  63. GRB 181020A: Swift detection of a burst with an optical counterpart
  64. Search for counterparts to IceCube-181014A with IceCube
  65. IceCube-181014A - IceCube observation of a high-energy neutrino candidate event
  66. GRB 181013A: Swift detection of a probable burst
  67. GRB 181010A: MASTER-Argentina OT detection
  68. GRB 181010A: Swift detection of a burst with an optical counterpart
  69. GRB 181002A: Swift detection of a burst
  70. GRB 180930A: KAIT Optical Upper Limit
  71. GRB 180930A: Swift detection of a burst
  72. GRB 180925A: Swift detection of a burst
  73. GRB 180924A: Swift detection of a burst
  74. Swift Trigger 863053 is not an astrophysical event
  75. GRB 180923A: MASTER inspection MAXI/GSC error box
  76. GRB 180914B: KAIT Optical Afterglow Candidate
  77. GRB 180914B: Tiled Swift observations
  78. GRB 180914A: MASTER automatic inspection
  79. GRB 180914A: Tiled Swift observations
  80. Fermi-LAT Gamma-ray Observations of IceCube-180908A
  81. INTEGRAL observation of IceCube-180908A
  82. Search for counterparts to IceCube-180908A with IceCube
  83. IceCube-180908A: HAWC follow-up
  84. Search for counterpart to IceCube-180908A with ANTARES
  85. GRB 180715A: 15 GHz upper limits from the AMI Short GRB Program
  86. GRB 180718A: 15 GHz upper limits from the AMI Short GRB Program
  87. IceCube-180908A - IceCube observation of a high-energy neutrino candidate event
  88. GRB 180905A: Swift detection of a burst
  89. GRB 180904A: NOT optical observations, candidate host galaxy
  90. GRB 180904A: Swift detection of a burst
  91. GRB 180829A: Tiled Swift observations
  92. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  93. GRB 180818B: TSHAO optical upper limit
  94. GRB 180823A: Swift detection of a burst
  95. GRB 180821A: iTelescope counterpart is not the afterglow
  96. GRB 180818B: 1.5m OSN optical afterglow candidate
  97. GRB 180821A: Swift detection of a burst
  98. GRB 180818B: Swift detection of a burst
  99. GRB 180818A: Swift detection of a burst
  100. GRB 180809A: further Swift/XRT observations

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