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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"

5556 results found.

  1. GRB 190326B: Insight-HXMT/HE detection
  2. GRB 190326A: Insight-HXMT/HE detection
  3. GRB 190324A: Swift/UVOT Observations
  4. GRB 190324B: Insight-HXMT/HE detection
  5. GRB 190324A: Insight-HXMT/HE detection
  6. GRB 190323A: Insight-HXMT/HE detection
  7. GRB190324A: MASTER OT observations
  8. GRB 190321A: Insight-HXMT/HE detection
  9. GRB 190324A: Swift/UVOT afterglow candidate
  10. SWIFT GRB190324.95 Global MASTER-Net observations report
  11. SWIFT GRB190323.85 Global MASTER-Net observations report
  12. GRB190320A: MASTER GRB counterpart decay
  13. GRB190320A: MASTER OT detection
  14. SWIFT GRB190320.05 Global MASTER-Net observations report
  15. Fermi trigger 574140965 / GRB190313.15: MASTER Global Robotic Net optical observation
  16. GRB 190311A: Mondy optical observations
  17. GRB190305A: MASTER Global Robotic Net optical observation
  18. GRB190311A: OAO observations
  19. [Hxmt-ba]GRB 190310A: Insight-HXMT/HE detection
  20. GRB 190311A: TSHAO optical observations
  21. GRB190311A: MASTER Global Robotic Net OT optical observation
  22. GRB 190311A: NEXT-0.6m optical afterglow detection
  23. GRB 190306B: Insight-HXMT/HE detection
  24. GRB 190305A: Insight-HXMT/HE detection
  25. GRB 190305A: MAXI/GSC detection
  26. Swift Trigger 891843 is not a GRB
  27. GRB 190305A: AGILE/MCAL detection of a burst
  28. IceCube-190221A: Fermi-LAT Gamma-ray observations
  29. GRB 190220A: Swift detection of a burst with an optical counterpart
  30. Trigger 889483: Swift detection of Swift J1858.6-0814
  31. GRB 190206A: AstroSat CZTI detection
  32. Trigger 888312: Swift detection of 4U 1901+03
  33. Konus-Wind observation of GRB 190206A
  34. IPN Triangulation of GRB 190206A (short/extremely bright)
  35. GRB 190203A: Mondy optical observations
  36. GRB 190202A: Xinglong-2.16m optical observations
  37. GRB 190204A: MAXI/GSC detection
  38. Swift Trigger 887541: MASTER optical observation
  39. GRB 190203A: MASTER OT detection
  40. GRB 190203A: Koshka Zeiss-1000 optical upper limit
  41. Improved IPN error box for GRB 190129B
  42. INTEGRAL observation of IceCube-190124A
  43. Trigger 885807: Swift detection of MAXI J1348-630
  44. Search for counterparts to IceCube-190124A with IceCube
  45. Fermi-LAT Gamma-ray Observations of IceCube-190124A
  46. IceCube-190124A - IceCube observation of a high-energy neutrino candidate event
  47. Trigger 885456: Swift detection of MAXI J1631-479
  48. GRB 190114C: VLA Detection
  49. GRB 190114C: Swift/UVOT Detection
  50. GRB 190114C: Fermi-LAT detection
  51. GRB 190114C: Swift detection of a very bright burst with a bright optical counterpart
  52. GRB 190114A: GROND detection of the afterglow
  53. GRB 190114A: VLT/X-shooter redshift
  54. GRB 190114A: Swift detection of a burst
  55. GRB 190109B: Mondy optical upper limit
  56. GRB 190103B: CALET Gamma-Ray Burst Monitor detection
  57. GRB 190106A: GWAC-F60B optical detection
  58. Search for Counterparts to IceCube-190104A with IceCube
  59. Konus-Wind observation of GRB 190103B
  60. Fermi LAT Gamma-ray Observations of IceCube-190104A
  61. GRB 190103B: Swift detection of a burst
  62. GRB 190103A: AGILE/MCAL detection of a burst
  63. GRB 181231A: Fermi GBM detection
  64. GRB 181231A: Fermi-LAT detection
  65. FRB 181228: Global MASTER Net optical inspection
  66. Swift Trigger 880127 is not a GRB
  67. GRB 181228A: REM NIR detection
  68. GRB 181225A: KAIT Follow-Up Observations with Upper Limit
  69. GRB 181228A: KAIT Optical Upper Limit
  70. GRB 181222A: MAXI/GSC detection
  71. GRB 181212A: Fermi GBM Detection
  72. GRB 181201A: continued optical observations in Mondy
  73. MASTER: OTs detection during Fermi alert trigger 565936249 early observations
  74. GRB181201A: GOTO optical observations
  75. GRB 181201A: continued optical observations in SAAO and Chilesope
  76. GRB 181201A: Further COATLI Optical Monitoring
  77. GRB 181202A: Swift detection of a burst with an optical counterpart
  78. GRB 181201A MASTER-Net OT detection
  79. GRB 181123B: Swift detection of a short burst
  80. Fermi GRB 181105.31: Global MASTER Net optical observations
  81. GRB 181103A: AbAO optical upper limit
  82. GRB 181103A: Nanshan-1m optical upper limit
  83. GRB 181030A: MASTER Net OT detection
  84. GRB 181027A: Swift detection of a burst
  85. Fermi-LAT Gamma-ray Observations of IceCube-181023A
  86. GRB 181022A: Swift-XRT refined Analysis
  87. Baksan Neutrino BNO 181021: Global MASTER-net Optical Follow-up Observations
  88. GRB 181020A: Global MASTER Net OT observations
  89. GRB 181016A: Swift detection of a burst
  90. GRB 181013A: Global MASTER Net optical observations
  91. GRB 181011A: Global MASTER Net optical inspection
  92. GRB 181011A: CALET Gamma-Ray Burst Monitor detection
  93. IPN Triangulation of GRB 181011A (long)
  94. GRB 181011A: MAXI/GSC detection
  95. GRB 181008B: Global MASTER Net optical inspection
  96. GRB 181010A: ePESSTO NTT optical observations
  97. GRB 181010A: Swift/UVOT Detection
  98. GRB 181010A: MASTER-Argentina OT detection
  99. GRB 181010A: Swift detection of a burst with an optical counterpart
  100. GRB 181003A: LCO Cerro Tololo observations

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