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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"

12371 results found.

  1. GRB 261019A: Insight-HXMT/HE detection
  2. IceCube-261020A: Upper limits from a search for additional neutrino events in IceCube
  3. GRB 261017A: SVOM/GRM observation
  4. GRB 261021A: Fermi GBM Final Real-time Localization
  5. Fermi-LAT Gamma-ray Observations of IceCube-261020A
  6. GRB 261020A: Fermi GBM Observation
  7. GRB 261017A: SAO RAS optical upper limit
  8. GRB 261017A: COLIBRÍ optical upper limit
  9. IceCube-261020A - IceCube observation of a high-energy neutrino candidate track-like event
  10. GRB 261020A: MAXI GSC detection
  11. GRB 261020A: Fermi GBM Final Real-time Localization
  12. Konus-Wind detection of GRB 261017A
  13. GRB 261019A: Fermi GBM Final Localization
  14. GRB 261017A: Luminance-band upper limit from a 28cm telescope in Chengde
  15. GRB 261017A: a short minimum variability timescale compatible with a compact object merger origin
  16. GRB 261017A: J band upper limit by the SYSU 80cm infrared telescope
  17. GRB 261017A : MITSuME Akeno optical upper limits
  18. GRB 261017A: Nanshan/NEXT optical upper limit
  19. GRB 261017A: Fermi GBM Observation
  20. GRB261010A: Retraction of Keck/MOSFIRE near-IR source
  21. GRB 261017A: Fermi GBM Final Real-time Localization
  22. GRB 261010A: Pan-STARRS z-band imaging and upper limit
  23. GRB 261010A: VLA radio observations
  24. GRB261010A: Keck/MOSFIRE detection of a near-IR source
  25. GRB 261010A: LBT tentative near-infrared detection
  26. GRB 261010A: Glowbug gamma-ray detection
  27. GRB 261008A: SVOM/GRM observation
  28. GRB 261009A: GECAM-B detection of a burst
  29. IceCube-261012A: Upper limits from a search for additional neutrino events in IceCube
  30. GRB 261010A: a short minimum variability timescale and a distinct pulse evolution compatible with a merger origin
  31. GRB 261013A: Fermi GBM Final Real-time Localization
  32. Fermi-LAT Gamma-ray Observations of IceCube-261012A
  33. GRID detection of GRB 261010A
  34. GRB 261011B: GECAM-B observation
  35. GRB 261010A: J-band upper limit by the SYSU 80cm infrared telescope
  36. IceCube-260919A: No transient candidates from the Zwicky Transient Facility
  37. GRB 261010A: a Type I-L (merger-driven) GRB candidate
  38. IceCube-261012A - IceCube observation of a high-energy neutrino candidate track-like event
  39. GRB 261010A: 10.4m GTC spectroscopy of the galaxy 2" from the afterglow
  40. Konus-Wind detection of GRB 261010A
  41. Konus-Wind detection of GRB 261007A/EP261007a
  42. GRB 261010A: NOT confirmation of the optical afterglow
  43. GRB 261010A: Fermi GBM Observation
  44. GRB 261011B: Fermi GBM Final Localization
  45. GRB 261010A: possible optical afterglow detected with the 1.5m OSN
  46. GRB 261010A: NOT possible optical counterpart
  47. GRB 261010A: Fermi GBM Final Real-time Localization
  48. GRB 261009A: Fermi GBM Final Real-time Localization
  49. GRB 261008A: GECAM-B observation
  50. GRB 261007A: SVOM/ECLAIRs refined analysis
  51. GRB 261007A: Glowbug gamma-ray detection
  52. GRB 261008A: Fermi GBM Final Real-time Localization
  53. GRB 261007A: NOT optical observations
  54. GRB 261007A: SVOM/GRM observation
  55. GRB 261007A / EP261007a: AstroSat CZTI detection
  56. GRB 261005A: GECAM-B observation
  57. GRB 261007A / EP261007a: SVOM/VT optical observations
  58. GRB 261007A / EP261007a: NuSTAR detection of prompt emission
  59. GRB 261007A / EP261007a: ULL-ASTRO-MASTER detection of the optical afterglow with LCO 40-cm telescope at McDonald Observatory
  60. GRB 261007A / EP261007a: TRT optical observations
  61. GRB 261007A / EP261007a: LCO optical observations
  62. GRB 261007B: Fermi GBM Final Real-time Localization
  63. GRB 261007A: Fermi GBM observation
  64. GRB 261005A: Glowbug gamma-ray detection
  65. GRB 261005B: Fermi GBM Observation
  66. GRB 261005A: Fermi GBM Final Real-time Localization
  67. GRB 261003A: Glowbug gamma-ray detection of a likely short burst
  68. GRB 261002A: Fermi GBM Final Localization
  69. GRB 260930B: SVOM/GRM observation
  70. GRB 260921B: GECAM-B observation
  71. GRB 260930B: GECAM-B detection of a burst
  72. Fermi GRB 261003A: Global MASTER-Net observations report
  73. GRB 261003A: Fermi GBM Final Real-time Localization
  74. Fermi-LAT Gamma-ray Observations of IceCube-260930A
  75. Fermi GBM Detection of GRB 260919A / EP260920a
  76. IceCube-260930A: Upper limits from a search for additional neutrino events in IceCube
  77. IPN triangulation of GRB 260919A / EP260920a
  78. Fermi GRB 260930B: Global MASTER-Net observations report
  79. GRB 260926C: SVOM/GRM observation
  80. GRB 260930B: Fermi GBM Final Real-time Localization
  81. GRB 260930A: Fermi GBM Final Real-time Localization
  82. IceCube-260930A - IceCube observation of a high-energy neutrino candidate track-like event
  83. GRB 260926C: AstroSat CZTI detection
  84. GRB 260926C: GECAM-B observation
  85. GRB 260926A: GECAM-B observation
  86. GRB 260926B: Glowbug gamma-ray detection of a likely short burst
  87. GRB 260926A: Glowbug gamma-ray detection
  88. GRB 260924A: VLA detection
  89. GRB 260924A: AbAO optical observations
  90. Fermi GRB 260928A: Global MASTER-Net observations report
  91. GRB 260928A: Fermi GBM Final Real-time Localization
  92. GRB 260924A: Upper limits from a neutrino search with IceCube
  93. Fermi GRB 260926C: Global MASTER-Net observations report
  94. GRB 260926C: Fermi GBM Final Real-time Localization
  95. GRB260914A: MAO/AZT-22 optical observations
  96. GRB 260926B: Fermi GBM Final Real-time Localization
  97. Fermi GRB 260926A: Global MASTER-Net observations report
  98. GRB 260924A: Near-infrared detection with MDM/MIRAGE
  99. GRB 260926A: Fermi GBM Final Real-time Localization
  100. Konus-Wind detection of GRB 260924A

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