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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"

45900 results found.

  1. GRB 260303A: SVOM/ECLAIRs refined analysis
  2. Fermi GRB 260305A: Global MASTER-Net observations report
  3. GRB 260305A: Fermi GBM Final Real-time Localization
  4. GRB 260303B: AstroSat CZTI detection
  5. GRB 260304A: AstroSat CZTI detection of a long burst
  6. SVOM/sb26030408: SVOM detection of an X-ray transient likely associated with Beta Persei
  7. GRB 260303A: SVOM/VT optical observations
  8. GRB 260303A: J-band observations with WINTER
  9. GRB 260303B: NuSTAR detection of prompt emission
  10. EP260302a: Global MASTER-Net observations report
  11. Fermi GRB 260303B: Global MASTER-Net observations report
  12. IceCube-260217A: No Candidate Transients from the Zwicky Transient Facility
  13. GRB 260228A: SVOM/ECLAIRs refined analysis
  14. GRB 260225A: SVOM/ECLAIRs refined analysis
  15. GRB 260303B: BALROG localization (Fermi Trigger 794237065 / GRB 260303559)
  16. GRB 260303B: Fermi GBM Final Real-time Localization
  17. EP260302a: analysis of the follow-up EP-FXT observation
  18. EP260227a: Gemini-South optical observations
  19. EP260302a: LCO observations
  20. EP260302a: BOOTES-7 optical counterpart detection at early times
  21. GRB 260303A: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  22. GRB 260303A: SVOM detection of a burst
  23. GRB 260228A: EP-FXT follow-up observation
  24. EP260302a: Einstein Probe detection of an X-ray transient
  25. The EP-WXT trigger 01709258736: Las Cumbres discovery of the optical counterpart
  26. GRB 251130B: TERI Gamma-ray detection
  27. GRB 260208A: TERI Gamma-ray detection
  28. GRB 260302A: Fermi GBM Final Real-time Localization
  29. EP260227a: Mondy optical observations
  30. GRB 260228A: CAHA 2.2m telescope optical upper limit
  31. GRB 260228A: SVOM/COLIBRÍ (FM-GFT) optical upper limit
  32. EP260227a: Mephisto optical detection
  33. GRID detection of GRB 260225D
  34. EP-WXT trigger 01709258652: 50cm Telescope multi-band observations
  35. EP260227a: further LCO observations
  36. EP260227a: SVOM/VT optical observation
  37. GRB 260228A: SVOM/VT optical upper limits
  38. GRB 260225D: SVOM/GRM observation
  39. EP260227A: 3.6m DOT optical afterglow detection
  40. GRB 260225B: SVOM/GRM observation
  41. GRB 260228A: SVOM detection of a burst
  42. EP260227a: FTW optical and NIR observations
  43. EP260227a: Liverpool Telescope optical observations
  44. EP260227a: LCOGT Optical Observations
  45. GRB 260226A: Asiago r-band upper limit
  46. EP260227a: Thai National Telescope observations
  47. EP260227a: likely GTC/OSIRIS+ redshift z = 2.714
  48. EP260227a: Liverpool Telescope observations
  49. EP260227a: COLIBRÍ optical observations
  50. EP260227a: NOT optical observations
  51. GRB 260225A: SVOM/VT optical continued observations and upper limit
  52. GRID detection of GRB 260223A
  53. EP260227a: Global MASTER-Net observations report
  54. EP260227a: Einstein Probe detection of an X-ray transient and refined analysis
  55. The EP-WXT trigger 01709258681 (EP260227a?): Las Cumbres follow-up observation of the optical counterpart
  56. EP/WXT trigger 01709258681 (EP260227a?): LCO candidate afterglow
  57. IceCube cascade alert 142200_1517143 retraction
  58. GRB 260226A: Insight-HXMT/HE detection of the very bright burst
  59. Konus-Wind detection of GRB 260226A
  60. GRB 260223A: 7DT detection and Medium-band SED of Afterglow
  61. EP260214a: VLT/FORS2 optical observations
  62. GRB 260225A: WINTER J-band upper limit
  63. GRB 260226A: CALET Gamma-Ray Burst Monitor detection
  64. GRB 260226A: COLIBRÍ optical upper limits
  65. GRB 260226A: LCOGT Optical Upper Limit
  66. EP-WXT trigger 01709258652: SVOM/C-GFT confirmation of a stellar flare
  67. GRB 260225D: Glowbug gamma-ray detection of a likely short burst
  68. GRB 260226A: Glowbug gamma-ray detection
  69. GRB 260226A: NuSTAR detection of bright prompt emission
  70. GRB 260226A : GROWTH-India Telescope optical observations
  71. GRB 260226A: LAST optical upper limit
  72. GRB 260226A: Fermi GBM observation
  73. GRB 260226A: Fermi-LAT refined analysis
  74. The EP-WXT trigger 01709258652 is likely a flaring star
  75. LAT GRB260226.44: Global MASTER-Net observations report
  76. Fermi GRB 260226A: Global MASTER-Net observations report
  77. GRB 260226A: AstroSat CZTI detection of bright long burst
  78. EP260214a: VLA 6 GHz detection
  79. GRB 260226A: Fermi-LAT detection of a bright burst
  80. GRB 260226A???: BALROG localization (Fermi Trigger 793795080 / GRB 260226443)
  81. EP260224a: LCO optical upper limits
  82. GRB260225A: SVOM/ECLAIRs refined position
  83. GRB 260226A: Fermi GBM Final Real-time Localization
  84. GRB 260225A: EP-FXT follow-up observation
  85. GRB 260225A: SVOM/VT optical observation
  86. GRB 260225A: SVOM/COLIBRÍ (FM-GFT) Detection of an Optical Counterpart Candidate
  87. GRB 260225C: Fermi GBM Final Real-time Localization
  88. GRB 260223A: Fermi GBM Observation
  89. GRB 260225A: SVOM/VT optical upper limits
  90. GRB 260225B: Fermi GBM Final Real-time Localization
  91. EP260126a: VLA 6 GHz detection
  92. EP260223a: Liverpool Telescope upper limits
  93. GRB 260225A: SVOM/COLIBRÍ (FM-GFT) optical upper limits
  94. GRB 260225A: SVOM detection of a burst
  95. EP260224a: Einstein Probe detection of an X-ray transient
  96. EP 260225.148: COLIBRÍ Confirmation of flaring star
  97. EP260223a: Xinglong optical upper limit
  98. The EP-WXT trigger 01709258631 is likely a flaring star
  99. GRB 260223A: Glowbug gamma-ray detection
  100. EP260213a: Mephisto optical upper limits

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