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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"

19209 results found.

  1. EP260920b: SVOM/VT optical observation
  2. EP260920b: refined analysis of the EP-WXT and EP-FXT observations
  3. EP260920b: COLIBRÍ optical observations
  4. The EP-WXT trigger 01709318601 is likely a flaring star
  5. EP Alert 260921.01: Global MASTER-Net observations report
  6. EP260920b: Global MASTER-Net observations report
  7. EP260920b: Einstein Probe detection of an X-ray transient
  8. IceCube-260919A: Upper limits from a search for additional neutrino events in IceCube
  9. EP Alert 260920.66: Global MASTER-Net observations report
  10. EP-WXT detected a brightening of HMXB LS V +44 17
  11. EP260920a: NOT early time optical upper limits
  12. EP260920a: NOT optical upper limits
  13. GRB 260920A: Fermi GBM Final Real-time Localization
  14. EP260920a: SVOM/VT optical upper limits
  15. EP260917a: Global MASTER-Net observations report
  16. EP260920a: refined analysis of the EP-WXT and autonomous EP-FXT observations
  17. EP260920a: COLIBRÍ optical upper limits
  18. EP260917b: EP-FXT non-detection and upper limit
  19. IceCube Alert 260919A: Global MASTER-Net observations report
  20. EP260920a: Einstein Probe detection of an X-ray transient
  21. EP Alert 260919.40: Global MASTER-Net observations report
  22. EP260917a: refined analysis of the EP-FXT observations
  23. The EP-WXT trigger 01709318491 is likely a flaring star
  24. EP260806a: Yamaguchi Interferometer radio detections
  25. EP260917a: SVOM/VT optical upper limits
  26. GRB 260918A: SVOM/C-GFT optical upper limits
  27. EP Alert 260918.62: Global MASTER-Net observations report
  28. Fermi GBM Sub-Threshold Detection of GRB 260918A
  29. EP Alert 260918.24: Global MASTER-Net observations report
  30. SVOM GRB260918.16: Global MASTER-Net observations report
  31. Konus-Wind detection of GRB 260916B (short/hard)
  32. The EP-WXT trigger 01709318279 is likely a flaring star
  33. GRB 260918A: SVOM/VT optical upper limits
  34. GRB 260916B: Glowbug gamma-ray detection of a short burst
  35. GRB 260918A: EP-FXT follow-up observation
  36. GRB 260917B: Mondy optical upper limit
  37. EP260917b: EP-WXT detection of an X-ray transient
  38. EP260917A: J-band upper limit with WINTER
  39. EP Alert 260917.32: Global MASTER-Net observations report
  40. GRB 260917B: EP-FXT follow-up observation
  41. EP260917a: COLIBRÍ optical upper limits
  42. GRB 260915A: Swift-XRT afterglow detection
  43. GRB 260918A: LCO optical upper limits
  44. EP260917a: Einstein Probe detection of an X-ray transient
  45. GRB 260918A: SVOM/COLIBRÍ (FM-GFT) optical upper limits
  46. GRB 260918A: SVOM detection of a burst
  47. GRB 260917C: Fermi GBM Final Real-time Localization
  48. GRB 260917B: FRAM-Auger optical limits
  49. GRB 260916B: Fermi GBM Detection
  50. IceCube-260916A: Upper limits from a search for additional neutrino events in IceCube
  51. GRB 260916B: Fermi GBM Final Localization
  52. GRB 260917A: Glowbug gamma-ray detection
  53. GRB 260915A: SVOM/ECLAIRs refined analysis
  54. GRB 260917B: WINTER J-band observations
  55. GRB 260917B: SVOM/VT optical observations
  56. SVOM GRB260917.16: Global MASTER-Net observations report
  57. GRB 260917B: LCO optical observation
  58. GRB 260917B: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  59. GRB 260917B: SVOM detection of a faint burst
  60. GRB 260917A: BALROG localization (Fermi Trigger 811304653 / GRB 260917100)
  61. GRB 260917A: Fermi GBM Final Real-time Localization
  62. Fermi trigger No 811304653: Global MASTER-Net observations report
  63. The EP-WXT trigger 01709317235 is likely a flaring star
  64. GRB 260915A: J-band upper limit with WINTER
  65. Fermi trigger No 811264269: Global MASTER-Net observations report
  66. GRB 260909A: NOEMA detection
  67. GRB 260914A: SVOM/GRM observation
  68. GRB 260914A: Mondy and TShAO optical observations
  69. GRB 260914A: SVOM/ECLAIRs refined analysis
  70. GRB 260909A: Swift-XRT observations
  71. GRB 260916A: MAXI/GSC detection
  72. MAXI GRB260916.37: Global MASTER-Net observations report
  73. GRB 260915A: J-band upper limit by SYSU 80cm infrared telescope
  74. GRB 260915A: SVOM/C-GFT optical upper limits
  75. GRB 260915A: EP-FXT follow-up observation
  76. GRB 260915A: SVOM/VT refined early optical upper limits
  77. GRB 260915A: REM optical/NIR observations
  78. GRB 260914A: REM optical/NIR observations
  79. GRB 260914A: VLT/X-shooter observations and redshift confirmation
  80. GRB 260915A: SVOM/VT optical upper limits
  81. GRB 260915A: SVOM/COLIBRÍ (FM-GFT) optical upper limit
  82. GRB 260914A: VLT/X-shooter spectroscopic redshift z = 0.778
  83. GRB 260915A: NOT optical upper limit
  84. SVOM GRB260915.05: Global MASTER-Net observations report
  85. GRB 260915A: SVOM/VT optical upper limits from VHF data
  86. Fermi GBM Sub-Threshold Detection of GRB 260915A
  87. GRB 260915A: LCO optical upper limits
  88. EP Alert 260914.53: Global MASTER-Net observations report
  89. GRB 260914A: EP-FXT follow-up observation
  90. GRB 260915A: SVOM detection of a burst
  91. Fermi GBM Sub-Threshold Detection of GRB 260914A
  92. GRB 260914A: LCO optical observation
  93. GRB 260914A: SVOM/C-GFT optical observations
  94. GRB 260914A: SVOM/VT optical counterpart confirmation
  95. GRB 260914A: SVOM/VT optical observation from VHF data
  96. GRB 260914A: SVOM/COLIBRÍ (FM-GFT) possible optical counterpart candidate
  97. SVOM GRB260914.47: Global MASTER-Net observations report
  98. GRB 260914A: SVOM detection of a burst
  99. GRB 260913A: SVOM trigger sb26091302 is not an astrophysical event
  100. GRB 260818A: Continued ATCA observations

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