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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"

32704 results found.

  1. GRB 260223A: COLIBRÍ further optical observations and a brightening
  2. EP260221a: Optical upper limit with Kinder observations
  3. GRB 260223A: COLIBRÍ optical observations
  4. GRB 260223A: DDOTI Optical Candidate
  5. Fermi GRB 260223A: Global MASTER-Net observations report
  6. EP260221a: Liverpool Telescope detection of COLIBRÍ counterpart candidate
  7. EP260221a: COLIBRÍ optical counterpart candidate
  8. EP260221a: Gemini South z-band upper limit
  9. EP260221a: Global MASTER-Net observations report
  10. EP260221a: EP-FXT follow-up observation
  11. Fermi GRB 260221B: Global MASTER-Net observations report
  12. EP260221a: Xinglong optical upper limit
  13. Fermi GRB 260221A: Global MASTER-Net observations report
  14. EP260221a: GOTO optical upper limit
  15. EP260221a: COLIBRÍ optical upper limit
  16. SVOM alert sb26021801: LCO optical upper limit
  17. GRB 260219A: AstroSat CZTI detection
  18. IceCube-260217A: Upper limits from a search for additional neutrino events in IceCube
  19. GRB 260219A: GECAM-B observation of a long burst
  20. Fermi GRB 260219A: Global MASTER-Net observations report
  21. SVOM alert sb26021801: LAST optical upper limit
  22. sb26021801: SVOM/COLIBRÍ (FM-GFT) optical upper limit
  23. Fermi-LAT Gamma-ray Observations of IceCube-260217A
  24. GRB 260214B/EP260214b: SVOM/ECLAIRs detection through targeted search
  25. EP260214b: Mondy optical observations
  26. EP260214b: 1.3m DFOT optical upper limit
  27. EP260210a: Mondy optical upper limits
  28. Konus-Wind detection of GRB 260212A
  29. GRB 260208A: AbAO and Terskol optical upper limits
  30. GRB 260208A: continued Mondy optical observations
  31. IPN triangulation of GRB 260212A
  32. IceCube-260217A - IceCube observation of a high-energy neutrino candidate track-like event
  33. GRB 260213A: GECAM-B observation of a short burst
  34. EP260214b: Liverpool Telescope optical observations
  35. GRB 260206A: probable hard X-ray burst from 4U 0513-40
  36. EP260214b: Optical upper limit with Kinder observations
  37. EP260214a: Optical upper limits with Kinder observations
  38. EP260214b: EP-FXT follow-up observation
  39. EP260214a / GRB 260214A: Fermi-GBM Sub-Threshold Detection
  40. EP260214b: DDOTI Optical Detection
  41. EP260214b: GROWTH-India Telescope optical upper limit
  42. EP260214a: VLT near-infrared observation
  43. EP260214b: SVOM/VT optical observation
  44. EP260214a: NOT optical upper limits
  45. EP260214a: COLIBRÍ optical upper limits
  46. EP260214b: OHP/T120 optical observations
  47. EP260214a: refined analysis of the EP-FXT observation
  48. EP260214b: LCO optical counterpart detection
  49. EP260214b: VLT/X-shooter spectroscopic redshift z = 1.208
  50. GRB 260211A: SVOM/VT optical counterpart
  51. EP260214b: COLIBRÍ optical observations
  52. EP260214a: SVOM/VT optical upper limits
  53. EP260214b: NOT optical counterpart detection
  54. EP260214a: Global MASTER-Net observations report
  55. GRB 260212A: AstroSat CZTI detection
  56. GRB 260212A: Fermi GBM Observation
  57. EP260213a: Liverpool Telescope optical upper limits
  58. EP260213a: Global MASTER-Net observations report
  59. EP260213a: COLIBRÍ optical upper limits
  60. GRB 260212A: GECAM-B observation
  61. EP260213a: Optical upper limits with Kinder observations
  62. EP260213a: SVOM/VT optical upper limit
  63. EP260213a: Mondy R-band optical upper limit
  64. EP260213a: NUTTelA-TAO Early Optical Limits
  65. EP260213a: SVOM/C-GFT upper limit
  66. EP260213a: refined analysis of the EP-FXT observation
  67. GRB 260212A: SVOM/GRM observation of a long burst
  68. GRB 260211A - SVOM/ECLAIRs refined analysis
  69. GRB 260204A: SVOM/ECLAIRs refined analysis
  70. GRB 260211A: EP-FXT follow-up observation
  71. GRB 260211A: SVOM/VT optical observation
  72. GRB 260212A: Glowbug gamma-ray detection
  73. GRB 260211A: GOTO optical upper limit
  74. Fermi GRB 260212A: Global MASTER-Net observations report
  75. GRB 260211A: LAST optical upper limit
  76. GRB 260210A: SVOM/GRM observation
  77. Fermi GBM Sub-Threshold Detection of GRB 260211A
  78. Konus-Wind detection of GRB 260207B
  79. GRB 260128B: SVOM/ECLAIRs refined analysis
  80. GRID detection of GRB 260207B
  81. GRB 260211A: LCO optical upper limits
  82. GRB260131A/B: 3.6m DOT Optical Observations
  83. GRB 260211A: SVOM/COLIBRÍ (FM-GFT) optical upper limits
  84. GRB 260208A: Swift UVOT detection
  85. Konus-Wind detection of GRB 260127B
  86. EP260209a: COLIBRÍ optical upper limit
  87. Fermi GRB 260210C: Global MASTER-Net observations report
  88. EP260209a: LCO optical upper limits
  89. EP260210a: Global MASTER-Net observations report
  90. EP260210a: refined analysis of the EP-FXT observation
  91. EP260209a: Global MASTER-Net observations report
  92. GRB 260208A: LCO detection of the optical counterpart
  93. EP260210a: Optical upper limits with Kinder observations
  94. IPN triangulation of GRB 260207B (short/hard with EE)
  95. GRB 260210A: Glowbug gamma-ray detection
  96. EP260210a: SVOM/VT optical upper limit
  97. GRB 260210A: AstroSat CZTI detection
  98. GRB 260208C: AstroSat CZTI detection
  99. EP260210a: COLIBRÍ optical upper limit
  100. EP260210a: SVOM/C-GFT upper limit

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