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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"

5847 results found.

  1. Fermi trigger No 621833240: Global MASTER-Net observations report
  2. Integral GRB200914.53: Global MASTER-Net observations report
  3. Fermi GRB 200914A: Global MASTER-Net observations report
  4. GRB 200914A: AGILE detection
  5. IceCube Alert 200914.00: Global MASTER-Net observations report
  6. IceCube-200911A: No significant detection in HAWC
  7. Fermi-LAT Gamma-ray Observations of IceCube-200911A and detection of a new gamma-ray source, Fermi J0330.1+3743
  8. IceCube-200911A: Upper limits from a search for additional neutrino events in IceCube
  9. IceCube Alert 200911.60: Global MASTER-Net observations report
  10. IceCube-200911A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  11. IceCube-200911A: IceCube observation of a high-energy neutrino candidate event
  12. Swift GRB200909.97: Global MASTER-Net observations report
  13. GRB 200909B: Swift detection of a burst
  14. GRB 200909A: AstroSat CZTI detection
  15. GRB 200829A: T100 observations
  16. Fermi GRB 200909A: Global MASTER-Net observations report
  17. GRB 200909A: BALROG localization (Fermi Trigger 621316887 / GRB 200909168)
  18. Fermi GRB 200908A: Global MASTER-Net observations report
  19. GRB 200907B: AstroSat CZTI detection
  20. GRB 200907B: MITSuME Okayama optical upper limits
  21. Swift GRB 200907B: Global MASTER-Net observations report
  22. Fermi GRB 200907C: Global MASTER-Net observations report
  23. Correction to GCN 28387: GRB 200907B GROWTH-India optical upper limit
  24. GRB200907A: GROWTH-India optical upper limit
  25. Fermi GRB 200906A: Global MASTER-Net observations report
  26. GRB 200906A: LBT near-infrared upper limit
  27. GRB 200907A: AGILE/MCAL detection of a burst
  28. GRB 200906A: GROWTH-India Telescope (GIT) optical r band upper limit
  29. GRB 200906A: OSN 1.5m Upper Limit
  30. GRB 200906A: Nanshan/NEXT optical upper limit
  31. Baksan Neutrino Observatory Alert 200905.99: Global MASTER-Net observations report
  32. GRB 200903E: AstroSat CZTI detection
  33. Fermi GRB 200904A: Global MASTER-Net observations report
  34. Fermi GRB 200903C: Global MASTER-Net observations report
  35. GRB 200903B: Insight-HXMT/HE detection
  36. AGILE detection of a burst (AGILE trigger no. 526185273)
  37. Fermi GRB 200903B: Global MASTER-Net observations report
  38. Swift GRB200903.03: Global MASTER-Net observations report
  39. GRB 200901A: MASTER OT early detection
  40. INTEGRAL Weak#8699: AROMA-N Optical Observation
  41. GRB 200901B: Swift detection of a burst
  42. Swift GRB200901.16: Global MASTER-Net observations report
  43. GRB 200830A: BALROG localization (Fermi Trigger 620474063 / GRB 200830413)
  44. GRB 200830A: Fermi GBM Final Real-time Localization
  45. GRB 200826A
  46. GRB 200829A: Swift detection of a burst with an optical afterglow
  47. Zwicky Transient Facility discovery of ZTF20abtxwfx/AT2020sev, a fast optical transient and candidate afterglow
  48. Konus-Wind detection of GRB 200826B
  49. IPN triangulation of GRB 200826B
  50. GRB 200826B: Fermi GBM detection
  51. Fermi GRB 200824A: Global MASTER-Net observations report
  52. GRB200826A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 620108997)
  53. GRB 200826B: Fermi GBM Final Real-time Localization
  54. GRB 200815A: MASTER optical observations
  55. Fermi GRB 200817A: Global MASTER-Net observations report
  56. GRB 200817A: Fermi GBM Final Real-time Localization
  57. Fermi trigger No 619270776: Global MASTER-Net observations report
  58. GRB 200809B: Fermi GBM detection
  59. Fermi GRB 200809B: Global MASTER-Net observations report
  60. GRB 200809B: BOOTES-3/YA optical upper limit
  61. GRB 200809B: AstroSat CZTI detection
  62. GRB 200809B: Swift/BAT-GUANO detection and arcminute localization
  63. Fermi trigger No 618642276: Global MASTER-Net observations report
  64. GRB 200806A: Swift detection of a burst
  65. LAT GRB200803.15: Global MASTER-Net observations report
  66. Fermi GRB 200803A: Global MASTER-Net observations report
  67. Fermi GRB 200802A: Global MASTER-Net observations report
  68. Fermi GRB 200801A: Global MASTER-Net observations report
  69. Fermi GRB 200714D: Global MASTER-Net observations report
  70. Fermi GRB 200714A: Global MASTER-Net observations report
  71. GRB 200713A: Swift detection of a burst
  72. GRB 200711A: Swift detection of a burst
  73. GRB 200706A: Fermi GBM Final Real-time Localization
  74. GRB 200705A: Fermi GBM Final Real-time Localization
  75. Trigger 980513: Swift detection of SGR Swift J1818.0-1607
  76. Fermi GRB 200626A: Global MASTER-Net observations report
  77. GRB 200623A: Swift-XRT observations
  78. LIGO/Virgo MS200614ct: Identification of a test binary black hole candidate
  79. Fermi trigger No 614103490: Global MASTER-Net observations report
  80. Baksan Neutrino Observatory Alert 200617.47: Global MASTER-Net observations report
  81. GRB 200615B: MAXI/GSC detection
  82. GRB 200616A: Fermi GBM Final Real-time Localization
  83. Fermi GRB 200615A: Global MASTER-Net observations report
  84. Fermi GRB 200614A: Global MASTER-Net observations report
  85. Baksan Neutrino Observatory Alert 200611.74: Global MASTER-Net observations report
  86. GRB 200612A: Late Optical Maximum Deteted by MASTER
  87. GRB 200612A: BOOTES-3/YA optical upper limit
  88. Fermi trigger No 613630183: Global MASTER-Net observations report
  89. GRB 200612A: Swift detection of a burst
  90. GRB 200609A: Fermi GBM Final Real-time Localization
  91. Fermi GRB 200607B: Global MASTER-Net observations report
  92. Fermi GRB 200607A: Global MASTER-Net observations report
  93. IPN triangulation of GRB 200605A (short)
  94. Fermi GRB 200604A: Global MASTER-Net observations report
  95. IceCube-200530A: No significant detection in HAWC
  96. IPN triangulation of GRB 200521A (short)
  97. Fermi GRB 200522B: Global MASTER-Net observations report
  98. GRB 200514B: Fermi GBM observation
  99. IPN triangulation of GRB 200514B (short)
  100. Fermi trigger No 611434353: Global MASTER-Net observations report

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