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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"

11622 results found.

  1. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  2. GRB 240825A: REM detection of the optical/NIR afterglow
  3. GRB 240825A: VLT/X-shooter redshift
  4. GRB 240825A: SVOM/C-GFT optical observations
  5. GRB 240825A: Montarrenti Observatory optical observations
  6. GRB 240825A: Fermi-LAT detection
  7. GRB 240824B: KAIT optical upper limit
  8. GRB 240824B: Fermi GBM Observation
  9. Fermi GRB 240825A: Global MASTER-Net observations report
  10. GRB 240824B: NOT optical upper limit
  11. GRB 240825A: 1.6m Mephisto multi-band detection
  12. GRB 240825A: AKO Optical Afterglow Detection
  13. GRB 240825A: Nanshan/HMT optical afterglow observations
  14. GRB 240825A: Fermi GBM Final Real-time Localization
  15. GRB 240824B: Swift-XRT afterglow detection
  16. GRB 240824B: Swift/BAT arcminute localization of a burst
  17. Fermi GRB 240824C: Global MASTER-Net observations report
  18. GRB 240824C: Fermi GBM Final Localization
  19. GRB 240821A: Swift/UVOT observations of the XRT sources.
  20. GRB 240824B: MAXI/GSC detection
  21. GRB 240824B: Fermi GBM Final Real-time Localization
  22. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  23. GRB 240821A: Colibri Optical Upper Limit
  24. GRB 240821A: Swift-XRT observations
  25. GRB 240821A: REM optical/NIR upper limits
  26. GRB 240821A: LCO optical observations
  27. GRB 240821A: JinShan optical upper limits
  28. GRB 240821A: GMG Optical Upper Limit
  29. Fermi GRB 240821A: Global MASTER-Net observations report
  30. GRB 240821A: Fermi GBM Observation
  31. Fermi trigger No 745964969: Global MASTER-Net observations report
  32. Fermi trigger No 745925274: Global MASTER-Net observations report
  33. GRB 240821A: Swift ToO observations
  34. Fermi trigger No 746019401: Global MASTER-Net observations report
  35. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  36. Fermi trigger No 745935375: Global MASTER-Net observations report
  37. GRB240821A: EIRSAT-1 GMOD Detection
  38. GRB240821B: First GRB Detected by EIRSAT-1 GMOD
  39. GRB 240821A: EP-FXT follow-up observation and afterglow candidates
  40. Fermi GRB 240821B: Global MASTER-Net observations report
  41. GRB 240821A: SVOM/GRM observation
  42. GRB 240821A: SVOM/GRM observation
  43. GRB 240821A: GRANDMA/LesMakes-T60 Upper Limit
  44. GRB 240821B: Fermi GBM Final Localization
  45. Fermi trigger No 745866488: Global MASTER-Net observations report
  46. GRB 240821A: BALROG localization (Fermi Trigger 745958167 / GRB 240821775)
  47. GRB 240821A : a likely short GRB detected by SVOM/ECLAIRs
  48. GRB 240821A: Fermi GBM Final Real-time Localization
  49. Fermi trigger No 745873283: Global MASTER-Net observations report
  50. Fermi trigger No 745871958: Global MASTER-Net observations report
  51. Fermi Gamma-ray Burst Monitor trigger 745811685 / 240820080 is not a GRB
  52. GRB 240820A: Fermi GBM Final Real-time Localization
  53. GRB 240814A: SVOM/GRM observation
  54. GRB 240814C: SVOM/GRM observation
  55. GRB 240817A: Fermi GBM Final Real-time Localization
  56. GRB 240814B: GRBAlpha detection
  57. Fermi trigger No 745501396: Global MASTER-Net observations report
  58. Fermi GRB 240814A: Global MASTER-Net observations report
  59. Fermi GRB 240814C: Global MASTER-Net observations report
  60. Fermi trigger No 745306088: Global MASTER-Net observations report
  61. GRB 240814C: Fermi GBM Final Real-time Localization
  62. Fermi GRB 240814B: Global MASTER-Net observations report
  63. GRB 240814B: Fermi GBM Final Real-time Localization
  64. GRB 240814A: Fermi GBM Final Real-time Localization
  65. Fermi trigger No 745220784: Global MASTER-Net observations report
  66. Konus-Wind detection of GRB 240810A
  67. Fermi Gamma-ray Burst Monitor trigger 745220784/240813240 is not a GRB
  68. GRB 240810A: SVOM/GRM observation
  69. Fermi Gamma-ray Burst Monitor trigger 240812940/745194848 is not a GRB
  70. Fermi Gamma-ray Burst Monitor trigger 240812917/745192855 is not a GRB
  71. Fermi Gamma-ray Burst Monitor trigger 240812917/745192855 is not a GRB
  72. GRB 240812D: Fermi GBM Final Real-time Localization
  73. GRB 240812C: Fermi GBM Final Real-time Localization
  74. IPN triangulation of GRB 240810A (short)
  75. Fermi Gamma-ray Burst Monitor trigger 745135620/240812255 is not a GRB
  76. Fermi GRB 240810A: Global MASTER-Net observations report
  77. Fermi Gamma-ray Burst Monitor trigger 240812094/745121685 is not a GRB
  78. GRB 240812A: Fermi GBM Final Real-time Localization
  79. Fermi trigger No 745057312: Global MASTER-Net observations report
  80. Fermi Gamma-ray Burst Monitor trigger 745050426/240811269 is not a GRB
  81. GRB 240810A: Fermi GBM Final Real-time Localization
  82. Konus-Wind detection of GRB 240807A (a counterpart of EP240807a)
  83. Fermi-LAT gamma-ray observations of IceCube-240808A
  84. IPN triangulation of GRB 240807A / EP 240807a
  85. GRB 240807A: SVOM/GRM observation
  86. EP240807a: STEP/T80S optical limits
  87. GRB 240807B: AstroSat CZTI detection of a short burst
  88. IceCube-240808A - IceCube observation of a high-energy neutrino candidate track-like event
  89. GRB 240801A: GRBAlpha detection
  90. GRB 240807B: Fermi GBM Final Localization
  91. GRB 240710B: VZLUSAT-2 detection
  92. GRB 240805A: ATCA Radio Upper Limits
  93. Fermi trigger No 744761058: Global MASTER-Net observations report
  94. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  95. GRB 240710A: VZLUSAT-2 detection
  96. GRB 240807A: Fermi GBM Final Localization
  97. Fermi trigger No 744629911: Global MASTER-Net observations report
  98. Konus-Wind detection of GRB 240805A
  99. GRB240805A: Fermi GBM Observation
  100. Fermi Gamma-ray Burst Monitor trigger 240806402/744629911 is not a GRB

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