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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"

28240 results found.

  1. GRB 181020A: Swift/UVOT Detection
  2. GRB 181020A: LCO Cerro Tololo observations
  3. GRB 181020A: Swift-BAT refined analysis
  4. GRB 181018A: Insight-HXMT/HE detection
  5. GRB 181017A: Insight-HXMT/HE detection
  6. GRB 181020A: Swift-XRT refined Analysis
  7. GRB 181020A: Fermi GBM detection
  8. GRB 181020A: Enhanced Swift-XRT position
  9. GRB 181020A: Swift detection of a burst with an optical counterpart
  10. FRB 181016: MASTER optical inspection of the Fast Radio Burst error box
  11. GRB 181014A: Insight-HXMT/HE detection
  12. Fermi GBM Observation of IceCube-181014A
  13. GRB 181016A: Swift-BAT refined analysis
  14. GRB 181013A: AbAO optical upper limit
  15. Search for counterparts to IceCube-181014A with IceCube
  16. Fermi-LAT Gamma-ray Observations of IceCube-181014A
  17. GRB 181013A: Swift/UVOT Upper Limits
  18. GRB 181013A: Swift-BAT refined analysis
  19. GRB 181013A: Swift-XRT afterglow detection
  20. GRB 181013A: Swift detection of a probable burst
  21. GRB 181011A: Global MASTER Net optical inspection
  22. GRB 181011A: MAXI/GSC detection
  23. GROND afterglow detection of GRB 181010A
  24. GRB 181008B: Global MASTER Net optical inspection
  25. GRB 181010A: Swift-BAT refined analysis
  26. IPN Triangulation of GRB 181008B (long)
  27. GRB 181010A: Swift/UVOT Detection
  28. GRB 181010A: Swift-XRT refined Analysis
  29. GRB 181008A: Insight-HXMT/HE detection
  30. GRB 181010A: Enhanced Swift-XRT position
  31. GRB 181010A: RATIR Optical and NIR Afterglow Detection
  32. GRB 181010A: LCO Cerro Tololo observations
  33. GRB 181010A: MASTER-Argentina OT detection
  34. GRB 181010A: Swift detection of a burst with an optical counterpart
  35. GRB 181002A: Mondy optical upper limit
  36. GRB 181003A: RATIR Optical and NIR Observations
  37. GRB 181003A: Swift-BAT refined analysis
  38. GRB 181003A: Swift-XRT afterglow detection
  39. GRB 181003A: Swift/UVOT Upper Limits
  40. GRB 180930A: TSHAO optical upper limit
  41. GRB 181002A: Swift-XRT refined Analysis
  42. GRB 181003A: LCO Cerro Tololo observations
  43. GRB 181003A: MASTER optical observation
  44. GRB181002A: GOTO optical limits
  45. GRB 181002A: Swift/UVOT Upper Limits
  46. GRB 181003A: Swift-XRT observations
  47. GRB 181002A: Swift-BAT refined analysis
  48. GRB 181002A: Enhanced Swift-XRT position
  49. GRB 181002A: Swift detection of a burst
  50. GRB 180914B: RTT150 optical observations
  51. GRB 180914B: RTT150 optical observations
  52. GRB 180930A: Swift-BAT refined analysis
  53. GRB 180930A: Swift-XRT refined Analysis
  54. GRB 180930A: NOT optical upper limits
  55. GRB 180930A: Swift/UVOT Upper Limits
  56. GRB 180930A: Enhanced Swift-XRT position
  57. GRB 180930A: Swift detection of a burst
  58. GRB 180924A: Swift/UVOT Upper Limits
  59. GRB 180925A: Insight-HXMT/HE detection
  60. GRB 180925A: Swift/UVOT Detection
  61. GRB 180925A: Swift-BAT refined analysis
  62. GRB 180925A: Swift-XRT refined Analysis
  63. GRB 180925A: Enhanced Swift-XRT position
  64. Konus-Wind observation of GRB 180923A
  65. GRB 180925A: Swift detection of a burst
  66. GRB 180924A: Swift-XRT refined Analysis
  67. GRB 180924A: Swift-BAT refined analysis
  68. GRB 180923B: Fermi GBM detection
  69. GRB 180924A: Enhanced Swift-XRT position
  70. GRB 180924A: Swift detection of a burst
  71. Swift Trigger 863053 is not an astrophysical event
  72. GRB 180923A: MASTER inspection MAXI/GSC error box
  73. GRB 180923A: MAXI/GSC detection
  74. GRB 180914B: DDOTI/OAN Detection and Confirmation of Fading
  75. GRB 180914B: GOTO optical detection
  76. GRB 180914B : continued TSHAO optical observations
  77. GRB 180914B : TSHAO optical observations
  78. GRB 180914B: Continued RATIR Optical and NIR Observations
  79. GRB 180914B: Optical counterpart observation from OAJ
  80. GRB 180914B: RATIR Optical and NIR Observations
  81. GRB 180914B: Swift-XRT afterglow detection
  82. GRB 180914A: RATIR Optical and NIR Observations
  83. GRB 180914A: MASTER automatic inspection
  84. GRB 180914A: Swift-XRT observations
  85. GRB 180914A: Fermi GBM detection
  86. IceCube-180908A: CALET Gamma-Ray Burst Monitor upper limits
  87. Fermi-LAT Gamma-ray Observations of IceCube-180908A
  88. INTEGRAL observation of IceCube-180908A
  89. IceCube-180908A: HAWC follow-up
  90. Search for counterpart to IceCube-180908A with ANTARES
  91. GRB 180715A: 15 GHz upper limits from the AMI Short GRB Program
  92. GRB 180718A: 15 GHz upper limits from the AMI Short GRB Program
  93. GRB 180905A: Swift/UVOT Upper Limits
  94. GRB 180905A, Swift-BAT refined analysis
  95. GRB 180905A: RATIR Optical and NIR Observations
  96. GRB 180905A: Swift-XRT refined Analysis
  97. GRB 180905A: Enhanced Swift-XRT position
  98. GRB 180904A: AbAO optical upper limit
  99. GRB 180904A: Swift/UVOT Upper Limits
  100. GRB 180904A: RATIR Optical and NIR Observations

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