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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

3386 results found.

  1. GRB 200829A: Continued Nanshan/NEXT optical observations
  2. GRB 200826A
  3. Fermi trigger No 620402299: Global MASTER-Net observations report
  4. IPN triangulation of GRB 200826B
  5. Swift Trigger 992444: a possible GRB 200821A
  6. Fermi trigger No 619270776: Global MASTER-Net observations report
  7. IceCube200806A: No significant detection in HAWC
  8. GRB 200809B: MAXI/GSC detection
  9. GRB 200806A: CALET Gamma-Ray Burst Monitor detection
  10. IPN triangulation of GRB 200805A (short)
  11. Swift GRB 200806A: Global MASTER-Net observations report
  12. GRB 200806A: Swift detection of a burst
  13. Fermi GRB 200802A: Global MASTER-Net observations report
  14. GRB 200729A: IceCube neutrino search
  15. GRB 200729A: TNG NIR upper limits
  16. IceCube GCN Notice 134327_10548129 retraction
  17. Baksan Neutrino Observatory Alert 200726.66: Global MASTER-Net observations report
  18. GRB 200723A: GOTO candidate afterglow and host galaxy
  19. IPN triangulation of GRB 200716A
  20. GRB 200716B: BALROG localization (Fermi Trigger 616577673 / GRB 200716316)
  21. GRB 200716B: Fermi GBM Final Real-time Localization
  22. GRB 200714E: Fermi GBM observation
  23. Fermi GRB 200714D: Global MASTER-Net observations report
  24. Fermi GRB 200714A: Global MASTER-Net observations report
  25. GRB 200714C: Fermi GBM Final Real-time Localization
  26. Fermi-LAT-ANTARES 200407a Coincidence
  27. Trigger 980513: Swift detection of SGR Swift J1818.0-1607
  28. GRB 200629A: AstroSat CZTI detection
  29. GRB 200623A: Further MMTCam Observations of XRT Source #3
  30. Fermi GRB 200626A: Global MASTER-Net observations report
  31. Updated catalog of X-ray bursts of SGR J1935+2154 from Insight-HXMT observations
  32. GRB 200623A: Swift-XRT observations
  33. GRB 200623A: TNG optical observations
  34. GRB 200623A: Correction to GCN 28013
  35. GRB 200623A: Swift/BAT-GUANO detection and arcminute localization of a short GRB
  36. LIGO/Virgo MS200619bf: Retraction of a test binary neutron star candidate
  37. Swift/UVOT Observations of IceCube 200615A
  38. Baksan Neutrino Observatory Alert 200617.47: Global MASTER-Net observations report
  39. Swift-XRT observations of IceCube 200615A
  40. GRB 200615B: MAXI/GSC detection
  41. Fermi GRB 200614A: Global MASTER-Net observations report
  42. Konus-Wind detection of GRB 200605A
  43. GRB 200608A: Swift detection of a burst
  44. Fermi GRB 200607A: Global MASTER-Net observations report
  45. 1RXS J1708−4009: Swift-BAT refined analysis
  46. Baksan Neutrino Observatory Alert 200603.12: Global MASTER-Net observations report
  47. Baksan Neutrino Observatory Alert 200601.42: Global MASTER-Net observations report
  48. GRB 200529A: LCO Optical Afterglow Detection
  49. GRB 200528A: CALET Gamma-Ray Burst Monitor detection
  50. GRB 200529A: BOOTES-2/TELMA early optical upper limit
  51. GRB 200524A: SAO RAS optical observations
  52. GRB 200528A: Assy optical upper limit
  53. GRB 200528A: Fermi GBM Observation
  54. GRB 200528A: Nanshan/NEXT optical upper limit
  55. Swift GRB 200528A: Global MASTER-Net observations report
  56. GRB 200528A: MITSuME Akeno optical upper limits
  57. GRB 200528A: Swift detection of a burst
  58. GRB 200528A: Fermi GBM Final Real-time Localization
  59. GRB 200524A: CrAO optical observations
  60. GRB 200525A: Fermi GBM Final Real-time Localization
  61. GRB200521A: ASIM observation
  62. Fermi GRB 200524A: Global MASTER-Net observations report
  63. Fermi GRB 200522B: Global MASTER-Net observations report
  64. Fermi trigger No 611434353: Global MASTER-Net observations report
  65. Swift Detection of a burst from SGR Swift J1818.0-1607
  66. Insight-HXMT's continued observation plan for SGR J1935+2154
  67. GRB 200509A: Swift detection of a burst with a possible optical counterpart
  68. GRB 200506A: AstroSat CZTI detection
  69. GRB 200506A: Fermi GBM Final Real-time Localization
  70. Insight-HXMT detection of a short bright burst from SGR 1935+2154
  71. Geocentric time correction for Insight-HXMT detection of the x-ray counterpart of the FRB by CHIME and STARE2 from SGR 1935+2154
  72. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  73. SGR 1935+2154: MASTER optical observations
  74. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154
  75. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  76. Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
  77. Integral GRB200428.61: Global MASTER-Net observations report
  78. A Forest of Bursts from SGR 1935+2154
  79. SGR 1935+2154: AstroSat CZTI detections
  80. high bursting activity of SGR 1935+2154: CGBM observations
  81. SGR 1935+2154 the Insight-HXMT observation plan
  82. IceCube Alert 200425.98: Global MASTER-Net observations report
  83. GRB 200424A: AstroSat CZTI detection
  84. GRB 200415A: ASIM observation
  85. GRB 200410A: Liverpool Telescope First Hour Observations
  86. Fermi GRB 200421A: Global MASTER-Net observations report
  87. Fermi trigger No 608935505: Global MASTER-Net observations report
  88. GRB 200412B: continued AbAO, Mondy, TSHAO, Terskol optical observations
  89. Fermi GRB 200415A: Global MASTER-Net observations report
  90. IceCube-200410A: No significant detection in HAWC
  91. Konus-Wind observation of a bright burst from SGR 1935+2154
  92. IceCube Alert 200410.97: Global MASTER-Net observations report
  93. Fermi trigger No 608204639: Global MASTER-Net observations report
  94. Baksan Neutrino Observatory Alert 200409.23: Global MASTER-Net observations report
  95. Fermi GRB 200407B: Global MASTER-Net observations report
  96. Baksan Neutrino Observatory Alert 200406.3: Global MASTER-Net observations report
  97. Fermi GRB 200403A: Global MASTER-Net observations report
  98. Fermi GRB 200402C: Global MASTER-Net observations report
  99. GRB 200325B: Optical upper limit
  100. Fermi GRB 200401A: Global MASTER-Net observations report

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