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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"

5159 results found.

  1. GRB 200907A: AGILE/MCAL detection of a burst
  2. GRB 200906A: Swift-XRT refined Analysis
  3. Fermi GRB 200903B: Global MASTER-Net observations report
  4. GRB 200901B: Swift-XRT refined Analysis
  5. GRB 200901A: Swift-XRT refined Analysis
  6. GRB 200829A: Continued Nanshan/NEXT optical observations
  7. Fermi GRB 200830A: Global MASTER-Net observations report
  8. Konus-Wind detection of GRB 200829A (a clone of GRB 200826B?)
  9. GRB 200829A: Swift-XRT refined Analysis
  10. Zwicky Transient Facility discovery of ZTF20abtxwfx/AT2020sev, a fast optical transient and candidate afterglow
  11. Fermi GRB 200826B: Global MASTER-Net observations report
  12. Fermi GRB 200824A: Global MASTER-Net observations report
  13. Fermi GRB 200826A: Global MASTER-Net observations report
  14. GRB 200824A: Fermi GBM Final Real-time Localization
  15. GRB 200819A: Swift-XRT refined Analysis
  16. Fermi trigger No 619270776: Global MASTER-Net observations report
  17. GRB 200809B: Swift-XRT afterglow detection
  18. GRB 200806A: Swift-XRT refined Analysis
  19. GRB 200803A: Swift-XRT afterglow detection
  20. LAT GRB200803.15: Global MASTER-Net observations report
  21. Fermi GRB 200803A: Global MASTER-Net observations report
  22. Fermi GRB 200801A: Global MASTER-Net observations report
  23. Swift Detection of an SGR-like flare from AX J1846.4-0258
  24. GRB 200729A: RT-22 observations at 36.8 GHz
  25. GRB 200729A: Swift-XRT refined Analysis
  26. GRB 200724A: Fermi GBM Final Real-time Localization
  27. GRB 200723A: BALROG localization (Fermi Trigger 617214929 / GRB 200723691)
  28. GRB 200723A: Fermi GBM Final Real-time Localization
  29. GRB 200716C: Kitab optical observations
  30. GRB 200716C: CrAO, Terskol, Assy-Turgen optical observations
  31. GRB 200716C: Swift-XRT refined Analysis
  32. GRB 200715A: Swift-XRT afterglow detection
  33. Fermi GRB 200714D: Global MASTER-Net observations report
  34. Fermi GRB 200714A: Global MASTER-Net observations report
  35. GRB 200713A: Swift-XRT refined Analysis
  36. Fermi trigger No 616370565: Global MASTER-Net observations report
  37. GRB 200711A: Swift-XRT refined Analysis
  38. Fermi GRB 200705A: Global MASTER-Net observations report
  39. Fermi-LAT-ANTARES 200407a Coincidence
  40. GRB 200702A: Fermi GBM Final Real-time Localization
  41. GRB 200630A: Swift-XRT refined Analysis
  42. GRB 200623A: LBT optical observations
  43. Fermi GRB 200625A: Global MASTER-Net observations report
  44. GRB 200623A: Swift/BAT-GUANO detection and arcminute localization of a short GRB
  45. Fermi trigger No 614239407: Global MASTER-Net observations report
  46. Fermi trigger No 614226976: Global MASTER-Net observations report
  47. Fermi trigger No 614103490: Global MASTER-Net observations report
  48. Baksan Neutrino Observatory Alert 200617.47: Global MASTER-Net observations report
  49. Fermi GRB 200616A: Global MASTER-Net observations report
  50. Fermi GRB 200615A: Global MASTER-Net observations report
  51. GRB 200615A: Fermi GBM Final Real-time Localization
  52. Baksan Neutrino Observatory Alert 200614.34: Global MASTER-Net observations report
  53. Fermi GRB 200614A: Global MASTER-Net observations report
  54. GRB 200612A: Swift-XRT refined Analysis
  55. GRB 200612A: Swift detection of a burst
  56. GRB 200609A: Fermi GBM Final Real-time Localization
  57. GRB 200608A: BOOTES-3 and BOOTES-4 optical upper limit
  58. GRB 200608A: Swift detection of a burst
  59. Fermi GRB 200607B: Global MASTER-Net observations report
  60. Fermi GRB 200607A: Global MASTER-Net observations report
  61. Baksan Neutrino Observatory Alert 200603.12: Global MASTER-Net observations report
  62. GRB 200529A: Swift-XRT refined Analysis
  63. GRB 200528A: Swift-XRT refined Analysis
  64. GRB 200529A: Swift detection of a burst
  65. GRB 200528A: Fermi GBM Final Real-time Localization
  66. IceCube-200523A: Upper limits from a search for additional neutrino events in IceCube
  67. GRB 200522A: Gemini North optical imaging
  68. GRB 200524A: CrAO optical observations
  69. GRB 200524A: Kitab observatory afterglow observations
  70. GRB 200524A: AstroSat CZTI detection
  71. GRB 200524A: OAJ multicolor afterglow detection
  72. GRB 200524A: Fermi GBM detection
  73. GRB 200524A: Liverpool Telescope observations
  74. GRB 200524A: CrAO observations of ZTF20abbiixp
  75. Fermi GRB 200524A: Global MASTER-Net observations report
  76. ZTF Discovery of ZTF20abbiixp: The Likely Optical Afterglow to GRB 200524A
  77. GRB 200524A: Fermi-LAT detection
  78. CGBM-SPI-ACS triangulation of short GRB 200521A
  79. GRB 200522A: Swift-XRT refined Analysis
  80. Fermi GRB 200522B: Global MASTER-Net observations report
  81. GRB 200514B: Fermi GBM observation
  82. GRB 200519A: Swift-BAT refined analysis
  83. Fermi trigger No 611676654: Global MASTER-Net observations report
  84. GRB 200519A: Swift-XRT refined Analysis
  85. IPN triangulation of GRB 200514B (short)
  86. Fermi trigger No 611434353: Global MASTER-Net observations report
  87. GRB 200517A: MAXI/GSC detection
  88. GRB 200514A: MITSuME Akeno optical upper limits
  89. GRB 200514A: MAXI/GSC detection
  90. GRB 200512A: Swift-XRT refined Analysis
  91. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  92. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  93. GRB 200506A: Fermi GBM Final Real-time Localization
  94. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  95. SGR 1935+2154: MASTER optical observations
  96. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154
  97. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  98. A Forest of Bursts from SGR 1935+2154
  99. SGR 1935+2154 the Insight-HXMT observation plan
  100. IceCube-200425A: No significant detection in HAWC

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