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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"

21025 results found.

  1. Fermi trigger No 746438824: Global MASTER-Net observations report
  2. SVOM GRB 240821A: optical afterglow discovery
  3. GRB 240821A: the second and third EP-FXT follow-up observations and afterglow candidates
  4. GRB 240825A: ALMA detection
  5. GRB 240825A: SAO RAS optical observations
  6. GRB 240824A: GIT optical upper limit
  7. GRB 240825A: TNG optical photometry and spectroscopy
  8. GRB 240825A: NUTTelA-TAO / BSTI Optical Limits
  9. GRB 240825A: GMG Continued Optical Observation on the Second Night
  10. GRB 240825A: KAIT optical observations
  11. GRB 240825A: PRIME near-infrared detection
  12. GRB 240825A: AKO Optical Follow-Up Observations
  13. GRB 240825A: Swift/UVOT Detection
  14. GRB 240825A: REM detection of the optical/NIR afterglow
  15. GRB 240825A: SVOM/C-GFT optical observations
  16. GRB 240825A: Montarrenti Observatory optical observations
  17. GRB 240825A: MASTER optical counterpart observation
  18. GRB 240825A: LCO optical observations
  19. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  20. Fermi GRB 240825A: Global MASTER-Net observations report
  21. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  22. GRB 240824B: NOT optical upper limit
  23. Swift GRB 240825A: Global MASTER-Net observations report
  24. GRB 240825A: 1.6m Mephisto multi-band detection
  25. GRB 240825A: Skynet Optical Afterglow observations
  26. GRB 240825A: Nanshan/HMT optical afterglow observations
  27. GRB 240824B: Swift-XRT afterglow detection
  28. GRB 240824A: Swift-XRT observations
  29. GRB 240824B: Swift/BAT arcminute localization of a burst
  30. GRB 240824B: Swift ToO observations
  31. Fermi GRB 240824C: Global MASTER-Net observations report
  32. GRB 240824A: Swift/UVOT Upper Limits
  33. GRB 240821A: Swift/UVOT observations of the XRT sources.
  34. GRB240824A: GRANDMA/TAROT-TCA Upper Limit
  35. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  36. GRB 240824A: KAIT optical upper limit
  37. GRB 240824A: Skynet Optical Afterglow Discovery
  38. Swift GRB240824.04: Global MASTER-Net observations report
  39. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  40. GRB 240821A: Colibri Optical Upper Limit
  41. EP240820a: PRIME J-band Observations
  42. GRB 240821A: Swift-XRT observations
  43. GRB 240821A: REM optical/NIR upper limits
  44. GRB 240821A: LCO optical observations
  45. GRB 240821A: JinShan optical upper limits
  46. GRB 240809A: Mondy and AbAO Optical Observations
  47. GRB 240821A: SVOM/VT follow-up and optical upper limit
  48. Fermi GRB 240821A: Global MASTER-Net observations report
  49. Fermi trigger No 745964969: Global MASTER-Net observations report
  50. Fermi trigger No 745925274: Global MASTER-Net observations report
  51. GRB 240821A: Swift ToO observations
  52. Fermi trigger No 746019401: Global MASTER-Net observations report
  53. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  54. Fermi trigger No 745935375: Global MASTER-Net observations report
  55. Fermi GRB 240821B: Global MASTER-Net observations report
  56. EP240801a: Keck/LRIS spectroscopic redshift confirmation
  57. GRB 240821A: GRANDMA/LesMakes-T60 Upper Limit
  58. Fermi trigger No 745866488: Global MASTER-Net observations report
  59. GRB 240819A: Swift-XRT observations
  60. GRB 240819A: JinShan optical upper limits on one Swift/XRT source
  61. EP240820a: TRT optical upper limit
  62. EP240820a: EP detection of a fast X-ray transient
  63. GRB 240819A: KAIT optical upper limit
  64. EP240816a: PRIME upper limits
  65. Fermi trigger No 745873283: Global MASTER-Net observations report
  66. Fermi trigger No 745871958: Global MASTER-Net observations report
  67. GRB 240819A: TRT optical upper limits on the Swift/XRT and EP/FXT sources
  68. GRB 240819A: Swift ToO observations
  69. EP240816b: Liverpool Telescope optical follow-up observations
  70. Integral GRB240816.79: Global MASTER-Net observations report
  71. IceCube-240721A: AT2023qqp and AT2024pge likely unrelated
  72. GRB GRB 240809A: Osservatorio Astronomico "Nastro Verde" optical observations: detection of an optical counterpart
  73. GRB 240805B: Osservatorio Astronomico Nastro Verde upper limit
  74. Fermi trigger No 745501396: Global MASTER-Net observations report
  75. EP240816a: EP detection of a fast X-ray transient and follow-up observation
  76. EP EP240816b: Global MASTER-Net observations report
  77. EP240816b: TRT optical upper limit
  78. EP240816b: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  79. Fermi GRB 240814A: Global MASTER-Net observations report
  80. Fermi GRB 240814C: Global MASTER-Net observations report
  81. Fermi trigger No 745306088: Global MASTER-Net observations report
  82. Fermi GRB 240814B: Global MASTER-Net observations report
  83. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  84. Fermi trigger No 745220784: Global MASTER-Net observations report
  85. GRB 240809A: ATA radio non-detection
  86. GRB 240809A : RAPAS follow-up observations
  87. GRB 240809A: VLA detection
  88. GRB 240809A: ALMA detection
  89. EP240807a: PRIME H-band upper limits
  90. GRB 240811A: Bassano Bresciano Observatory upper limit
  91. GRB 240811A: Swift/UVOT Upper Limits
  92. EP240801a: Assy-Turgen optical observations
  93. Fermi GRB 240810A: Global MASTER-Net observations report
  94. GRB 240811A: Upper limits with Mephisto
  95. Fermi trigger No 745057312: Global MASTER-Net observations report
  96. Swift GRB 240811A: Global MASTER-Net observations report
  97. GRB240809A: Liverpool Telescope optical follow-up observations
  98. GRB 240809A: REM detection of the optical afterglow
  99. GRB 240809A: Bassano Bresciano Observatory optical observations
  100. Fermi-LAT gamma-ray observations of IceCube-240808A

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