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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"

36093 results found.

  1. GRB 260223A: BALROG localization (Fermi Trigger 793512674 / GRB 260223174)
  2. Fermi GRB 260223A: Global MASTER-Net observations report
  3. GRB 260223A: Fermi GBM Final Real-time Localization
  4. GRB 260222A: Fermi GBM Final Real-time Localization
  5. Fermi GRB 260221B: Global MASTER-Net observations report
  6. GRB 260221B: Fermi GBM Final Real-time Localization
  7. Fermi GRB 260221A: Global MASTER-Net observations report
  8. GRB 260221A: Fermi GBM Final Real-time Localization
  9. GRB 260219A: AstroSat CZTI detection
  10. GRB 260219A: GECAM-B observation of a long burst
  11. Fermi GRB 260219A: Global MASTER-Net observations report
  12. GRB 260219A: Fermi GBM Final Real-time Localization
  13. GRB 260217A: Fermi GBM Final Localization
  14. GRB 260214B/EP260214b: SVOM/ECLAIRs detection through targeted search
  15. EP260214b: Mondy optical observations
  16. EP260210a: Mondy optical upper limits
  17. Konus-Wind detection of GRB 260212A
  18. GRB 260208A: AbAO and Terskol optical upper limits
  19. GRB 260208A: continued Mondy optical observations
  20. IPN triangulation of GRB 260212A
  21. GRB 260213A: GECAM-B observation of a short burst
  22. GRB 260216A: Fermi Gamma-ray Burst Monitor trigger 792969362/260216886 is not a GRB
  23. GRB 260216A: Fermi GBM Final Real-time Localization
  24. GRB 260206A: probable hard X-ray burst from 4U 0513-40
  25. EP260214a: Optical upper limits with Kinder observations
  26. EP260214a / GRB 260214A: Fermi-GBM Sub-Threshold Detection
  27. EP260214b: VLT/X-shooter spectroscopic redshift z = 1.208
  28. GRB 260211A: SVOM/VT optical counterpart
  29. GRB 260212A: AstroSat CZTI detection
  30. GRB 260212A: Fermi GBM Observation
  31. GRB 260212A: GECAM-B observation
  32. EP260213a: Mondy R-band optical upper limit
  33. GRB 260212A: SVOM/GRM observation of a long burst
  34. GRB 260213B: Fermi GBM Final Localization
  35. GRB 260213B: BALROG localization (Fermi Trigger 792697214 / GRB 260213736)
  36. GRB 260211A - SVOM/ECLAIRs refined analysis
  37. GRB 260204A: SVOM/ECLAIRs refined analysis
  38. GRB 260213A: Fermi GBM Final Localization
  39. GRB 260211A: EP-FXT follow-up observation
  40. GRB 260211A: SVOM/VT optical observation
  41. GRB 260212A: Glowbug gamma-ray detection
  42. GRB 260211A: GOTO optical upper limit
  43. Fermi GRB 260212A: Global MASTER-Net observations report
  44. GRB 260212A: Fermi GBM Final Real-time Localization
  45. GRB 260211A: LAST optical upper limit
  46. GRB 260210A: SVOM/GRM observation
  47. Fermi GBM Sub-Threshold Detection of GRB 260211A
  48. Konus-Wind detection of GRB 260207B
  49. GRB 260128B: SVOM/ECLAIRs refined analysis
  50. GRID detection of GRB 260207B
  51. GRB 260211A: LCO optical upper limits
  52. GRB260131A/B: 3.6m DOT Optical Observations
  53. GRB 260211A: SVOM/COLIBRÍ (FM-GFT) optical upper limits
  54. GRB 260211A: SVOM detection of a burst
  55. Konus-Wind detection of GRB 260209B
  56. GRB 260208A: Swift UVOT detection
  57. Konus-Wind detection of GRB 260127B
  58. Fermi GRB 260210C: Global MASTER-Net observations report
  59. GRB 260208A: LCO detection of the optical counterpart
  60. IPN triangulation of GRB 260207B (short/hard with EE)
  61. GRB 260210C: Fermi GBM Final Real-time Localization
  62. GRB 260210A: Glowbug gamma-ray detection
  63. GRB 260210B: Fermi GBM Final Real-time Localization
  64. GRB 260210A: AstroSat CZTI detection
  65. GRB 260208C: AstroSat CZTI detection
  66. GRB 260208B: refined analysis of the EP-FXT observation
  67. GRB 260207B: AstroSat CZTI detection
  68. GRB 260208C: SVOM/GRM observation
  69. GRB 260204A: Swift-XRT afterglow detection
  70. GRB 260208B: AstroSat CZTI detection of a bright long burst
  71. GRB 260208A: Glowbug gamma-ray detection
  72. GRB 260208A: NuSTAR detection of prompt emission
  73. GRB 260208A: Fermi GBM Observation
  74. Fermi GRB 260209A: Global MASTER-Net observations report
  75. GRB 260208B: Swift-XRT observations
  76. GRB 260131A/B: continued Mondy optical observations
  77. GRB 260204A: Swift/UVOT Upper Limits
  78. GRB 260208B: COLIBRÍ optical observations
  79. GRB 260208A: Mondy optical observations (duplicate submission)
  80. GRB 260208A: Mondy optical observations
  81. GRB 260208A: 1.3m DFOT optical detection
  82. GRB 260208A: COLIBRÍ optical observations
  83. GRB 260208B: EP-FXT observation
  84. GRB 260208A: NOT spectroscopic redshift z = 2.36
  85. GRB 260208A: Liverpool Telescope optical detection
  86. Fermi GRB 260208C: Global MASTER-Net observations report
  87. GRB 260208B: SVOM/VT optical candidate
  88. GRB 260208A: GECAM-B observation of a bright burst
  89. GRB 260208A: Zwicky Transient Facility Follow-Up of a Fermi GRB (Trigger 792220053)
  90. GRB 260209A: Fermi GBM Final Real-time Localization
  91. GRB 260208A: SVOM/VT optical observation
  92. Fermi GRB 260208D: Global MASTER-Net observations report
  93. GRB 260208D: Fermi GBM Final Real-time Localization
  94. GRB 260208A: Swift-XRT observations
  95. GRB 260208B: Swift ToO observations
  96. GRB 260208B: SVOM/GRM observation of a bright burst
  97. GRB 260208B: Fermi GBM Detection
  98. LAT GRB 260208B: Global MASTER-Net observations report
  99. GRB 260208B: Fermi-LAT detection
  100. GRB 260208C: Fermi GBM Final Real-time Localization

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