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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"

11661 results found.

  1. GRB 190619B: Fermi GBM Final Real-time Localization
  2. Fermi trigger No 582596766 Global MASTER-Net observations report
  3. GRB 190619A: Fermi GBM Final Real-time Localization
  4. GRB 190613B: AstroSat CZTI detection
  5. GRB 190611B: AstroSat CZTI detection
  6. Konus-Wind observation of GRB 190613B
  7. GRB 190615A: Insight-HXMT/HE detection
  8. Fermi trigger No 582304592 Global MASTER-Net observations report
  9. GRB 190615A: Fermi GBM Final Real-time Localization
  10. Fermi trigger No 582159815 Global MASTER-Net observations report
  11. GRB 190613B: GROND Detection of the Optical/NIR Afterglow
  12. GRB 190611B: CALET Gamma-Ray Burst Monitor detection
  13. GRB 190613B: Insight-HXMT/HE detection
  14. Konus-Wind observation of GRB 190611B
  15. Fermi trigger No 582115625 Global MASTER-Net observations report
  16. GRB 190613A: Fermi GBM detection
  17. GRB 190613B: Fermi GBM observation
  18. GRB 190611B: BALROG localization (Fermi Trigger 581986074 / GRB 190611950)
  19. IPN Triangulation of GRB 190611B
  20. GRB 190613B: BALROG localization (Fermi Trigger 582115625 / GRB 190613449)
  21. GRB 190613B: Fermi GBM Final Real-time Localization
  22. GRB 190609A: AstroSat CZTI detection
  23. GRB 190613A: MASTER OT detection
  24. GRB 190613A: BALROG localization (Fermi Trigger 582091643 / GRB 190613172)
  25. GRB 190613A: Fermi GBM Final Real-time Localization
  26. Fermi trigger No 582091643 Global MASTER-Net observations report
  27. Fermi trigger No 582012834 Global MASTER-Net observations report
  28. Fermi trigger No 581986074 Global MASTER-Net observations report
  29. GRB 190611B: Fermi GBM detection
  30. GRB 190610B: AstroSat CZTI detection
  31. Fermi trigger No 582004649 Global MASTER-Net observations report
  32. GRB 190612A: Fermi GBM Final Real-time Localization
  33. Konus-Wind observation of GRB 190606A
  34. Fermi trigger No 581889628 Global MASTER-Net observations report
  35. GRB 190610C: Fermi GBM Final Real-time Localization
  36. Fermi trigger No 581882394 Global MASTER-Net observations report
  37. GRB190610B: BALROG localization (Fermi Trigger 581882394 / GRB 190610750)
  38. GRB 190610B: Fermi GBM Final Real-time Localization
  39. Fermi trigger No 581841498 Global MASTER-Net observations report
  40. GRB190609A: BALROG localization (Fermi Trigger 581758450 / GRB 190609315)
  41. GRB 190609A: Fermi GBM Final Real-time Localization
  42. Fermi trigger No 581719018 Global MASTER-Net observations report
  43. GRB 190605A: AstroSat CZTI detection
  44. Fermi trigger No 581645543 Global MASTER-Net observations report
  45. GRB 190608A: Fermi GBM Final Real-time Localization
  46. GRB 190606A: Insight-HXMT/HE detection
  47. IPN Triangulation of GRB 190606A (short)
  48. GRB 190606A: Fermi GBM detection
  49. GRB 190530A: Further OAJ/OSN photometry and analysis
  50. GRB 190606A: Fermi-LAT detection
  51. Fermi trigger No 581478912 / GRB 190606A: AGILE/MCAL observations
  52. GRB 190604A: Insight-HXMT/HE detection
  53. Fermi trigger No 581478912 Global MASTER-Net observations report
  54. Fermi trigger No 581469752 Global MASTER-Net observations report
  55. GRB 190605A: Fermi GBM Final Real-time Localization
  56. GRB 190604A: AstroSat CZTI detection
  57. GRB 190530A: optical follow-up observations at Konkoly
  58. GRB190530A: Photometric follow-up with GROWTH-India telescope
  59. Fermi trigger No 581337762 Global MASTER-Net observations report
  60. GRB190604A: BALROG localization (Fermi Trigger 581337762 / GRB 190604446)
  61. GRB 190604A: Fermi GBM Final Real-time Localization
  62. GRB 190531B: CALET Gamma-Ray Burst Monitor detection
  63. Fermi trigger No 581281470 Global MASTER-Net observations report
  64. GRB 190603A: Fermi GBM Final Real-time Localization
  65. Konus-Wind observation of GRB 190531B
  66. GRB 190530A: R-band observation from HCT
  67. LIGO/Virgo S190602aq: No counterpart candidates in Fermi-LAT observations
  68. LIGO/Virgo S190602aq: Upper limits from Fermi-GBM Observations
  69. Konus-Wind observation of extremely bright GRB 190530A
  70. GRB 190530A: Insight-HXMT/HE detection
  71. GRB 190531B: Insight-HXMT/HE detection
  72. GRB 190530A: Mondy and AbAO optical observations
  73. GRB 190531B: VLT optical upper limit
  74. Fermi trigger No 581068049 Global MASTER-Net observations report
  75. GRB 190530A: Konkoly optical observations of the afterglow
  76. GRB 190530A: SAO RAS optical observations
  77. GRB 190531B: MASTER optical observation
  78. GRB 190531B: Swift-XRT afterglow detection
  79. GRB 190531B: Fermi GBM observations
  80. Fermi Fermi trigger No 581002688 Global MASTER-Net observations report
  81. GRB 190531B: Swift ToO observations
  82. GRB 190531B: Fermi-LAT detection
  83. GRB 190530A: Steep afterglow decay found by OSN
  84. GRB 190531B: name correction re. GCN 24696
  85. GRB 190530A: AbAO optical observations
  86. GRB 190530A: Xinglong 2.16m optical observation
  87. Fermi Trigger 581026217 / GRB 190531840 / GRB190531A: BALROG localization
  88. GRB 190531B: Fermi GBM Final Real-time Localization
  89. GRB 190530A: AstroSat CZTI detection
  90. GRB 190530A: optical afterglow detection by 5 MASTER telescopes
  91. GRB 190530A: Fermi GBM observation
  92. GRB 190531A: Fermi GBM Final Real-time Localization
  93. GRB 190530A: COATLI Optical Detection of the Fading Afterglow
  94. GRB 190530A: Swift-XRT afterglow detection
  95. GRB 190530A: GWAC-F30 optical detection
  96. GRB 190530A: OAJ optical detection
  97. GRB 190530A: NOT photometry and spectroscopy
  98. Fermi GRB190530.43 Global MASTER-Net observations report
  99. GRB 190530A: Bright afterglow confirmed by OSN
  100. GRB 190530A: AGILE/GRID analysis

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