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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"

5163 results found.

  1. GRB 200907B: AstroSat CZTI detection
  2. GRB 200907B: Swift-XRT refined Analysis
  3. Fermi GRB 200907C: Global MASTER-Net observations report
  4. GRB 200907C: Fermi GBM Final Real-time Localization
  5. GRB 200907A: AGILE/MCAL detection of a burst
  6. GRB 200906A: Swift-XRT refined Analysis
  7. Fermi GRB 200903B: Global MASTER-Net observations report
  8. GRB 200901B: Swift-XRT refined Analysis
  9. GRB 200901A: Swift-XRT refined Analysis
  10. GRB 200829A: Continued Nanshan/NEXT optical observations
  11. Fermi GRB 200830A: Global MASTER-Net observations report
  12. Konus-Wind detection of GRB 200829A (a clone of GRB 200826B?)
  13. GRB 200829A: Swift-XRT refined Analysis
  14. Zwicky Transient Facility discovery of ZTF20abtxwfx/AT2020sev, a fast optical transient and candidate afterglow
  15. Fermi GRB 200826B: Global MASTER-Net observations report
  16. Fermi GRB 200824A: Global MASTER-Net observations report
  17. Fermi GRB 200826A: Global MASTER-Net observations report
  18. GRB 200824A: Fermi GBM Final Real-time Localization
  19. GRB 200819A: Swift-XRT refined Analysis
  20. Fermi trigger No 619270776: Global MASTER-Net observations report
  21. GRB 200809B: Swift-XRT afterglow detection
  22. GRB 200806A: Swift-XRT refined Analysis
  23. GRB 200803A: Swift-XRT afterglow detection
  24. LAT GRB200803.15: Global MASTER-Net observations report
  25. Fermi GRB 200803A: Global MASTER-Net observations report
  26. Fermi GRB 200801A: Global MASTER-Net observations report
  27. Swift Detection of an SGR-like flare from AX J1846.4-0258
  28. GRB 200729A: RT-22 observations at 36.8 GHz
  29. GRB 200729A: Swift-XRT refined Analysis
  30. GRB 200724A: Fermi GBM Final Real-time Localization
  31. GRB 200723A: BALROG localization (Fermi Trigger 617214929 / GRB 200723691)
  32. GRB 200723A: Fermi GBM Final Real-time Localization
  33. GRB 200716C: Kitab optical observations
  34. GRB 200716C: CrAO, Terskol, Assy-Turgen optical observations
  35. GRB 200716C: Swift-XRT refined Analysis
  36. GRB 200715A: Swift-XRT afterglow detection
  37. Fermi GRB 200714D: Global MASTER-Net observations report
  38. Fermi GRB 200714A: Global MASTER-Net observations report
  39. GRB 200713A: Swift-XRT refined Analysis
  40. Fermi trigger No 616370565: Global MASTER-Net observations report
  41. GRB 200711A: Swift-XRT refined Analysis
  42. Fermi GRB 200705A: Global MASTER-Net observations report
  43. Fermi-LAT-ANTARES 200407a Coincidence
  44. GRB 200702A: Fermi GBM Final Real-time Localization
  45. GRB 200630A: Swift-XRT refined Analysis
  46. GRB 200623A: LBT optical observations
  47. Fermi GRB 200625A: Global MASTER-Net observations report
  48. GRB 200623A: Swift/BAT-GUANO detection and arcminute localization of a short GRB
  49. Fermi trigger No 614239407: Global MASTER-Net observations report
  50. Fermi trigger No 614226976: Global MASTER-Net observations report
  51. Fermi trigger No 614103490: Global MASTER-Net observations report
  52. Baksan Neutrino Observatory Alert 200617.47: Global MASTER-Net observations report
  53. Fermi GRB 200616A: Global MASTER-Net observations report
  54. Fermi GRB 200615A: Global MASTER-Net observations report
  55. GRB 200615A: Fermi GBM Final Real-time Localization
  56. Baksan Neutrino Observatory Alert 200614.34: Global MASTER-Net observations report
  57. Fermi GRB 200614A: Global MASTER-Net observations report
  58. GRB 200612A: Swift-XRT refined Analysis
  59. GRB 200612A: Swift detection of a burst
  60. GRB 200609A: Fermi GBM Final Real-time Localization
  61. GRB 200608A: BOOTES-3 and BOOTES-4 optical upper limit
  62. GRB 200608A: Swift detection of a burst
  63. Fermi GRB 200607B: Global MASTER-Net observations report
  64. Fermi GRB 200607A: Global MASTER-Net observations report
  65. Baksan Neutrino Observatory Alert 200603.12: Global MASTER-Net observations report
  66. GRB 200529A: Swift-XRT refined Analysis
  67. GRB 200528A: Swift-XRT refined Analysis
  68. GRB 200529A: Swift detection of a burst
  69. GRB 200528A: Fermi GBM Final Real-time Localization
  70. IceCube-200523A: Upper limits from a search for additional neutrino events in IceCube
  71. GRB 200522A: Gemini North optical imaging
  72. GRB 200524A: CrAO optical observations
  73. GRB 200524A: Kitab observatory afterglow observations
  74. GRB 200524A: AstroSat CZTI detection
  75. GRB 200524A: OAJ multicolor afterglow detection
  76. GRB 200524A: Fermi GBM detection
  77. GRB 200524A: Liverpool Telescope observations
  78. GRB 200524A: CrAO observations of ZTF20abbiixp
  79. Fermi GRB 200524A: Global MASTER-Net observations report
  80. ZTF Discovery of ZTF20abbiixp: The Likely Optical Afterglow to GRB 200524A
  81. GRB 200524A: Fermi-LAT detection
  82. CGBM-SPI-ACS triangulation of short GRB 200521A
  83. GRB 200522A: Swift-XRT refined Analysis
  84. Fermi GRB 200522B: Global MASTER-Net observations report
  85. GRB 200514B: Fermi GBM observation
  86. GRB 200519A: Swift-BAT refined analysis
  87. Fermi trigger No 611676654: Global MASTER-Net observations report
  88. GRB 200519A: Swift-XRT refined Analysis
  89. IPN triangulation of GRB 200514B (short)
  90. Fermi trigger No 611434353: Global MASTER-Net observations report
  91. GRB 200517A: MAXI/GSC detection
  92. GRB 200514A: MITSuME Akeno optical upper limits
  93. GRB 200514A: MAXI/GSC detection
  94. GRB 200512A: Swift-XRT refined Analysis
  95. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  96. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  97. GRB 200506A: Fermi GBM Final Real-time Localization
  98. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  99. SGR 1935+2154: MASTER optical observations
  100. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154

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