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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"

28100 results found.

  1. GRB 181002A: Swift-XRT refined Analysis
  2. GRB 181003A: LCO Cerro Tololo observations
  3. GRB 181003A: MASTER optical observation
  4. GRB181002A: GOTO optical limits
  5. GRB 181002A: Swift/UVOT Upper Limits
  6. GRB 181003A: Swift-XRT observations
  7. GRB 181002A: Swift-BAT refined analysis
  8. GRB 181002A: Enhanced Swift-XRT position
  9. GRB 181002A: Swift detection of a burst
  10. GRB 180914B: RTT150 optical observations
  11. GRB 180914B: RTT150 optical observations
  12. GRB 180930A: Swift-BAT refined analysis
  13. GRB 180930A: Swift-XRT refined Analysis
  14. GRB 180930A: NOT optical upper limits
  15. GRB 180930A: Swift/UVOT Upper Limits
  16. GRB 180930A: Enhanced Swift-XRT position
  17. GRB 180930A: Swift detection of a burst
  18. GRB 180924A: Swift/UVOT Upper Limits
  19. GRB 180925A: Insight-HXMT/HE detection
  20. GRB 180925A: Swift/UVOT Detection
  21. GRB 180925A: Swift-BAT refined analysis
  22. GRB 180925A: Swift-XRT refined Analysis
  23. GRB 180925A: Enhanced Swift-XRT position
  24. Konus-Wind observation of GRB 180923A
  25. GRB 180925A: Swift detection of a burst
  26. GRB 180924A: Swift-XRT refined Analysis
  27. GRB 180924A: Swift-BAT refined analysis
  28. GRB 180923B: Fermi GBM detection
  29. GRB 180924A: Enhanced Swift-XRT position
  30. GRB 180924A: Swift detection of a burst
  31. Swift Trigger 863053 is not an astrophysical event
  32. GRB 180923A: MASTER inspection MAXI/GSC error box
  33. GRB 180923A: MAXI/GSC detection
  34. GRB 180914B: DDOTI/OAN Detection and Confirmation of Fading
  35. GRB 180914B: GOTO optical detection
  36. GRB 180914B : continued TSHAO optical observations
  37. GRB 180914B : TSHAO optical observations
  38. GRB 180914B: Continued RATIR Optical and NIR Observations
  39. GRB 180914B: Optical counterpart observation from OAJ
  40. GRB 180914B: RATIR Optical and NIR Observations
  41. GRB 180914B: Swift-XRT afterglow detection
  42. GRB 180914A: RATIR Optical and NIR Observations
  43. GRB 180914A: MASTER automatic inspection
  44. GRB 180914A: Swift-XRT observations
  45. GRB 180914A: Fermi GBM detection
  46. IceCube-180908A: CALET Gamma-Ray Burst Monitor upper limits
  47. Fermi-LAT Gamma-ray Observations of IceCube-180908A
  48. INTEGRAL observation of IceCube-180908A
  49. IceCube-180908A: HAWC follow-up
  50. Search for counterpart to IceCube-180908A with ANTARES
  51. GRB 180715A: 15 GHz upper limits from the AMI Short GRB Program
  52. GRB 180718A: 15 GHz upper limits from the AMI Short GRB Program
  53. GRB 180905A: Swift/UVOT Upper Limits
  54. GRB 180905A, Swift-BAT refined analysis
  55. GRB 180905A: RATIR Optical and NIR Observations
  56. GRB 180905A: Swift-XRT refined Analysis
  57. GRB 180905A: Enhanced Swift-XRT position
  58. GRB 180904A: AbAO optical upper limit
  59. GRB 180904A: Swift/UVOT Upper Limits
  60. GRB 180904A: RATIR Optical and NIR Observations
  61. GRB 180904A: Swift-BAT refined analysis
  62. GRB 180905A: Swift detection of a burst
  63. GRB 180904A: Swift-XRT refined Analysis
  64. GRB 180904A: SAO RAS optical observations
  65. GRB 180904A: OSN observations
  66. GRB 180904A: Enhanced Swift-XRT position
  67. GRB 180904A: NOT optical observations, candidate host galaxy
  68. GRB 180904A: Swift detection of a burst
  69. GRB 180829A: Swift-XRT observations
  70. GRB 180828A: Swift/UVOT Upper Limits
  71. GRB 180828A: RATIR Optical and NIR Observations
  72. GRB 180828A: Swift-BAT refined analysis
  73. GRB 180829A/MAXI J0406-019: MAXI/GSC detection
  74. GRB 180828A: Swift-XRT refined Analysis
  75. GRB 180828A / Swift J1754.9-2548: Enhanced Swift-XRT position
  76. GRB 180828A: Fermi GBM observation
  77. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  78. GRB 180818B: TSHAO optical upper limit
  79. GRB 180823A, Swift-BAT refined analysis
  80. IPN Triangulation of GRB 180824A (short)
  81. GRB 180823A: Swift/UVOT Upper Limits
  82. GRB 180823A: RATIR Optical and NIR Observations
  83. GRB 180823A: Swift-XRT refined Analysis
  84. GRB 180823A: Enhanced Swift-XRT position
  85. GRB 180823A: Swift detection of a burst
  86. GRB 180821A: VLT observations
  87. GRB 180821A: Swift/UVOT Upper Limits
  88. GRB 180821A: Swift-XRT refined Analysis
  89. GRB 180821A: Enhanced Swift-XRT position
  90. GRB 180818B: 1.5m OSN optical afterglow candidate
  91. GRB 180821A: iTelescope optical afterglow detection
  92. GRB 180821A: Swift detection of a burst
  93. GRB180806A: confirmation of the X-ray afterglow
  94. GRB 180818B: Swift-XRT refined Analysis
  95. GRB 180818B: Swift-BAT refined analysis
  96. GRB 180818A: Swift-BAT refined analysis
  97. GRB 180818B: Fermi GBM observations
  98. GRB 180818B: Swift/UVOT Upper Limits
  99. GRB 180818B: Enhanced Swift-XRT position
  100. GRB 180818A: Swift/UVOT Upper Limits

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