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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"

27295 results found.

  1. GRB 190204A: COATLI Optical Detection of the Fading Afterglow
  2. GRB 190203A: Liverpool Telescope near-IR observations
  3. GRB 190203A: Swift-XRT refined Analysis
  4. GRB 190204A: Swift-XRT refined Analysis
  5. Swift Trigger 887541: MASTER inspect
  6. GRB 190204A: MAXI/GSC detection
  7. GRB 190204A: Swift detection of a burst with a possible optical counterpart
  8. Swift Trigger 887541: MASTER optical observation
  9. GRB 190203A: MASTER OT detection
  10. Swift Trigger 887541: Swift detection of Swift J1728.9-3613
  11. GRB 190203A: SAO RAS optical observations, afterglow fading
  12. GRB 190203A: Swift detection of a burst with an optical counterpart
  13. GRB 190202A: Swift-XRT refined Analysis
  14. GRB 190202A: LCO-CTIO optical observations
  15. GRB 190202A: Fermi GBM observation
  16. Fermi GBM trigger 570825115/190202772 is not a GRB
  17. GRB 190202A, Swift-BAT refined analysis
  18. GRB 190202A: AGILE ratemeters detection
  19. GRB 190202A: Swift/UVOT Detection
  20. GRB 190202A: GOTO optical observations
  21. GRB 190202A: Swift detection of a burst with an optical counterpart
  22. Fermi GBM trigger 570716645/190201517 is not a GRB
  23. GRB 190131A: Insight-HXMT/HE detection
  24. Fermi GBM trigger 570659556/190131856 is not a GRB
  25. GRB 190129B: Insight-HXMT/HE detection
  26. GRB 190129A: CALET Gamma-Ray Burst Monitor detection
  27. GRB 190129B: GROND possible host candidate
  28. Fermi GBM Observations of IceCube-190124A
  29. GRB 190129A: Fermi GBM detection
  30. Trigger 886496: Another Swift trigger on MAXI J1348-630
  31. Swift Trigger 886157: MASTER optical observation
  32. Trigger 886486: Swift detection of MAXI J1631-479
  33. Trigger 886266: Another Swift trigger on MAXI J1348-630
  34. Swift Trigger 886157: Swift detection of a new transient Swift J1728.9-3613
  35. INTEGRAL triggers from 8205 to 8211 are due to MAXI J1348-630, NOT to a GRB
  36. Swift Trigger 885960: A third Swift trigger on MAXI J1348-630
  37. Trigger 885845: A second Swift trigger on MAXI J1348-630
  38. Trigger 885807: Swift detection of MAXI J1348-630
  39. GRB 190123A: NEXT-0.6m optical limit
  40. GRB 190123A: AROMA-N Optical Observation
  41. GRB 190123A: Swift/UVOT Upper Limits
  42. GRB 190123A: COATLI Optical Observations
  43. GRB 190123A: Swift-BAT refined analysis
  44. GRB 190121A: CALET Gamma-Ray Burst Monitor detection of a short burst
  45. GRB190123A: MITSuME Akeno optical upper limits
  46. GRB 190123A: GMG observational limit
  47. Trigger 885456: Swift detection of MAXI J1631-479
  48. GRB 190123A: Swift-XRT refined Analysis
  49. GRB 190123A: Fermi GBM observation
  50. GRB 190123A: BOOTES-4/MET optical limit
  51. GRB 190123A: MASTER Global Robotic Net optical observation
  52. GRB 190123A: Swift detection of a burst
  53. GRB 190122A: Fermi GBM observation
  54. GRB 190122A: Fermi-LAT detection
  55. IPN Triangulation of GRB 190118A (long)
  56. Trigger 884906: Swift detection of MAXI J1631-479
  57. GRB 190117A: Insight-HXMT/HE detection
  58. GRB 190114C: RATIR Optical and NIR Detections
  59. GRB 190114C: COATLI Optical Detection
  60. GRB 190106A: Discovery Channel Telescope observations
  61. Konus-Wind observation of GRB 190114C
  62. GRB 190114B: Swift-XRT refined Analysis
  63. GRB 190114C: Swift/UVOT Detection
  64. GRB 190114C: Swift-BAT refined analysis
  65. GRB 190114B: Liverpool Telescope near-IR observations
  66. GRB 190114B, Swift-BAT refined analysis
  67. GRB 190114B: Swift/UVOT Upper Limits
  68. GRB 190114A: Swift/UVOT Observations
  69. GRB 190114A: Mondy optical afterglow detectio
  70. GRB 190114C:Insight-HXMT/HE detection
  71. GRB 190114C: A type 1 BdHN with TeV emission
  72. GRB 190114C: SPI-ACS/INTEGRAL extended emission detection
  73. GRB 190114B: NOT optical counterpart
  74. GRB 190114C: Fermi-LAT detection
  75. GRB 190114C: Fermi GBM detection
  76. GRB 190114C: Swift-XRT refined Analysis
  77. GRB 190114B: MITSuME Akeno optical upper limits
  78. GRB 190114C: GROND detection of the afterglow
  79. GRB 190114A: NOT optical observations
  80. GRB 190114B: Mondy optical afterglow detection
  81. GRB 190114C: NOT optical counterpart and redshift
  82. GRB 190114B: BOOTES-4/MET optical afterglow detection
  83. GRB 190114C: MASTER 4-polarizations filters OT detection
  84. GRB 190114C: MASTER afterglow Detection
  85. GRB 190114C: Swift detection of a very bright burst with a bright optical counterpart
  86. GRB 190114B: Swift detection of a burst
  87. GRB 190114A: Swift-BAT refined analysis
  88. GRB 190103B: Swift/UVOT Upper Limits
  89. GRB 190114A: Swift-XRT refined Analysis
  90. GRB 190114A: GROND detection of the afterglow
  91. GRB 190114A: Possible UVOT Detection
  92. GRB 190114A: Swift detection of a burst
  93. GRB 190110A：Insight-HXMT/HE detection
  94. GRB 190110A, Swift-BAT refined analysis
  95. Correction to GCN Circular 23663: GRB 190109A: Swift UVOT Upper Limits
  96. GRB 190110A: Fermi GBM detection
  97. GRB 190110A: Swift detection of a burst
  98. GRB 181228A: FRAM-ORM optical limit
  99. GRB 190106A: GMG continued observation
  100. IceCube-190104A: AstroSat CZTI counterpart search

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