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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"

8523 results found.

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

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