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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"

11846 results found.

  1. GRB 190627A: Swift detection of a burst
  2. Fermi trigger No 583245413 Global MASTER-Net observations report
  3. Fermi trigger No 583245413 Global MASTER-Net observations report
  4. IceCube-190619A: prompt emission upper limits from AstroSat-CZTI
  5. Swift GRB190624.86 Global MASTER-Net observations report
  6. Swift trigger 911102: D50 optical limit
  7. Swift Trigger 911102: a possible GRB
  8. Fermi trigger No 582886211 Global MASTER-Net observations report
  9. Fermi trigger No 582748289 Global MASTER-Net observations report
  10. Fermi trigger No 582759998 Global MASTER-Net observations report
  11. Fermi-LAT Gamma-ray Observations of IceCube-190619A
  12. IceCube-190619A: IceCube additional correlated neutrino search: upper limits
  13. GRB 190620A: BALROG localization (Fermi Trigger 582725415 / GRB 190620507)
  14. GRB 190620A: Fermi GBM Final Real-time Localization
  15. Fermi trigger No 582615488 Global MASTER-Net observations report
  16. Konus-Wind observation of GRB 190613B
  17. GRB 190613B: Kitab observatory optical upper limit
  18. Fermi trigger No 582159815 Global MASTER-Net observations report
  19. GRB 190613B: Optical observation from Asiago Schmidt
  20. Konus-Wind observation of short/hard GRB 190610A
  21. Konus-Wind observation of GRB 190611B
  22. Fermi trigger No 582115625 Global MASTER-Net observations report
  23. GRB 190613B: Swift-XRT refined Analysis
  24. GRB 190613A: FRAM-ORM afterglow detection
  25. GRB 190613A, Swift-BAT refined analysis
  26. GRB 190613B: KAIT Optical Afterglow Confirmation
  27. GRB 190613B: Swift/UVOT Detection
  28. GRB 190613A: Swift-XRT refined Analysis
  29. GRB 190613B: Swift detection of a burst with an optical counterpart
  30. GRB 190613A: MASTER OT detection
  31. Swift GRB190613.17 Global MASTER-Net observations report
  32. Fermi trigger No 582091643 Global MASTER-Net observations report
  33. Fermi trigger No 581986074 Global MASTER-Net observations report
  34. GRB 190611A: Swift-XRT refined Analysis
  35. GRB 190611A: Swift detection of a burst
  36. Konus-Wind observation of GRB 190606A
  37. Fermi trigger No 581889628 Global MASTER-Net observations report
  38. GRB 190610C: Fermi GBM Final Real-time Localization
  39. Fermi trigger No 581882394 Global MASTER-Net observations report
  40. Fermi trigger No 581719018 Global MASTER-Net observations report
  41. Fermi trigger No 581645543 Global MASTER-Net observations report
  42. LIGO/Virgo S190425z: Swift UVOT - no new sources identified, and a summary of the Swift UVOT processing of GW triggers.
  43. GRB 190606A: Fermi-LAT detection
  44. Fermi trigger No 581478912 Global MASTER-Net observations report
  45. GRB 190530A: optical follow-up observations at Konkoly
  46. GRB190604B: GROWTH-India telescope followup - no optical counterpart found
  47. GRB190604B: Swift/UVOT detection
  48. GRB 190531B: CALET Gamma-Ray Burst Monitor detection
  49. LIGO/Virgo S190602aq: AstroSat CZTI upper limits
  50. Fermi trigger No 581281470 Global MASTER-Net observations report
  51. Konus-Wind observation of GRB 190531B
  52. LIGO/Virgo S190602aq: No counterpart candidates in Fermi-LAT observations
  53. LIGO/Virgo S190602aq: Upper limits from AGILE-GRID observations
  54. LIGO/Virgo S190602aq Global MASTER-Net observations report
  55. LIGO/Virgo S190602aq: Coverage and upper limits from MAXI/GSC observations
  56. LIGO/Virgo S190602aq: No counterpart candidates in HAWC observations
  57. Konus-Wind observation of extremely bright GRB 190530A
  58. GRB 190531B: MASTER optical observation
  59. GRB 190531B: Swift-XRT afterglow detection
  60. GRB 190531B: Fermi GBM observations
  61. GRB 190531B: Fermi-LAT detection
  62. Fermi Trigger 581026217 / GRB 190531840 / GRB190531A: BALROG localization
  63. GRB 190531B: Fermi GBM Final Real-time Localization
  64. GRB 190530A: optical afterglow detection by 5 MASTER telescopes
  65. GRB 190530A: Fermi GBM observation
  66. GRB 190530A: Swift-XRT afterglow detection
  67. GRB 190530A: GWAC-F30 optical detection
  68. GRB 190530A: OAJ optical detection
  69. Fermi GRB190530.43 Global MASTER-Net observations report
  70. GRB 190530A: Fermi-LAT detection
  71. GRB 190530A: AGILE-MCAL detection
  72. LIGO/Virgo S190518bb: AstroSat CZTI upper limits
  73. LIGO/Virgo S190521g: AstroSat CZTI upper limits
  74. LIGO/Virgo S190517h: AstroSat CZTI upper limits
  75. LIGO/Virgo S190519bj: AstroSat CZTI upper limits
  76. LIGO/Virgo S190521r: CNEOST follow-up observations
  77. Fermi GRB190525.03 Global MASTER-Net observations report
  78. LIGO/Virgo S190521r: No optical counterpart from SVOM/GWAC observations.
  79. LIGO/Virgo S190521g: No optical counterpart from SVOM/GWAC observations.
  80. LIGO/Virgo S190521r: No candidate counterparts from ATLAS observations of the skymap
  81. Konus-Wind observation of GRB 190519A
  82. LIGO/Virgo S190521g: No Counterparts in DDOTI/OAN Optical Observations
  83. LIGO/Virgo S190521r: Coverage and upper limits from Fermi-LAT observations
  84. LIGO/Virgo S190521g: No candidate counterpart in Fermi-LAT observations
  85. LIGO/Virgo S190521r: Coverage and upper limits from MAXI/GSC observations
  86. LIGO/Virgo S190521r: No counterpart candidates in HAWC observations
  87. LIGO/Virgo S190519bj: Fermi-LAT search for a high-energy gamma-ray counterpart
  88. IGO/Virgo S190521g: Coverage and upper limits from MAXI/GSC observations
  89. LIGO/Virgo S190521g: No counterpart candidates in HAWC observations
  90. LIGO/Virgo S190512at: SVOM/GWAC-F60A observations
  91. Fermi GRB190520.6 Global MASTER-Net observations report
  92. LIGO/Virgo S190519bj: MAXI/GSC Observations
  93. LIGO/Virgo S190519bj Global MASTER-Net observations report
  94. LIGO-Virgo S190519bj: AGILE GRID observations
  95. LIGO/Virgo S190519bj: HAWC follow-up
  96. GRB 190519A: Swift detection of a burst
  97. Fermi GRB190517.81 Global MASTER-Net observations report
  98. LIGO/Virgo S190517h: Fermi-LAT search for a high-energy gamma-ray counterpart
  99. LIGO/Virgo S190517h: HAWC follow-up
  100. LIGO/Virgo S190517h: MAXI/GSC Observations

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