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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"

11672 results found.

  1. GRB 230903A: Fermi GBM Final Real-time Localization
  2. GRB 230827B: Glowbug gamma-ray detection
  3. GRB 230827A: Glowbug gamma-ray detection
  4. GRB 230826A: Glowbug gamma-ray detection
  5. GRB 230827B: Swift-XRT afterglow detection
  6. GRB 230812B: Spectroscopic detection of the associated SN 2023pel.
  7. GRB 230827B: Swift ToO observations
  8. GRB 230827A: Fermi GBM Observation
  9. GRB 230827B: CALET Gamma-Ray Burst Monitor detection
  10. GRB 230827A: VZLUSAT-2 detection
  11. GRB 230827A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  12. GRB 230826A: VZLUSAT-2 detection
  13. GRB 230827B: VZLUSAT-2 detection
  14. GRB 230827B / GRB 230827256: Fermi GBM Observation
  15. GRB 230827A: GRBAlpha detection
  16. GRB 230827A: BALROG localization (Fermi Trigger / GRB 230827762)
  17. Fermi trigger No 714809315: Global MASTER-Net observations report
  18. GRB 230827.256: AKO Optical follow-up of ZTF23abaanxz (AT 2023qxj)
  19. Fermi GRB 230827A: Global MASTER-Net observations report
  20. GRB 230827.256 : GIT optical follow-up of ZTF23abaanxz/AT2023qxj
  21. GRB 230827A: Fermi GBM Final Real-time Localization
  22. AT 2023qxj: ZTF discovery of the likely afterglow of Fermi GRB 230827256
  23. GRB 230826A: GRBAlpha detection
  24. GRB 230826A: Fermi GBM Observation
  25. GRB 230826A: Mondy optical observations
  26. GRB 230826A: Swift detection of a burst
  27. GRB 230826A: Fermi GBM Final Real-time Localization
  28. GRB 230812B: radio detection with the VLA
  29. Fermi Gamma-ray Burst Monitor trigger 714618399/230825046 is not a GRB
  30. Fermi trigger No 714618399: Global MASTER-Net observations report
  31. GRB 230822A: Fermi GBM Observation
  32. GRB 230822A: Swift/BAT-GUANO detection of a burst
  33. IceCube-230823A - IceCube observation of a high-energy neutrino candidate track-like event
  34. GRID detection of GRB 230818A
  35. GRB 230822A: Fermi GBM Final Real-time Localization
  36. GRB 230812B: Assy optical observations, possible SN rise
  37. GRB 230812B: SAO RAS RC-500 and Zeiss-1000 observations
  38. GRB 20230818A: GIT optical upper limit
  39. Konus-Wind detection of GRB 230818A
  40. GRB 230812B : GRANDMA/Kilonova-Catcher optical afterglow detection and upper limits
  41. GRB 230818A: Fermi GBM Observation
  42. GRB 230812B: GIT Confirmation of SN rise
  43. GRB 230818A: Nickel and KAIT telescope optical observations
  44. GRB 230818A: SAO RAS 6-m telescope spectroscopy
  45. GRB 230812B: SAO RAS Zeiss-1000 observations
  46. GRB 230818A: further SAO RAS Zeiss-1000 observations
  47. GRB 230818A: AKO Upper Limit
  48. GRB 230818A: AstroSat CZTI detection
  49. GRB 230818A: Tautenburg observations
  50. GRB 230818A: Leavitt Observatory upper limit
  51. GRB 230818A: Bassano Bresciano Observatory optical observations
  52. GRB 230818A: KGO RC-25 optical observations
  53. GRB 230818A: NOT photometry and spectroscopy
  54. GRB 230818A: SAO RAS Zeiss-1000 observations
  55. Fermi GRB 230818A: Global MASTER-Net observations report
  56. Fermi trigger No 713974668: Global MASTER-Net observations report
  57. GRB 230818A: GOTO optical afterglow detection
  58. GRB 230818A: Fermi GBM Final Real-time Localization
  59. GRB 230812B: SAO RAS observations, possible re-brightening
  60. GRB 230817A: AstroSat CZTI detection
  61. GRB 230812B: SAO RAS optical observations
  62. Fermi GRB 230817A: Global MASTER-Net observations report
  63. GRB 230817A: BALROG localization (Fermi Trigger 713966581 / GRB 230817502)
  64. GRB 230817A: Fermi GBM Final Real-time Localization
  65. GRB 230812B: optical photometry from Konkoly
  66. GRB 230812B: SAO RAS optical observations
  67. GRB 230812B: GAD Observatory optical observations (upper limit)
  68. GRB 230812B: iTelescope optical upper limit
  69. GRB 230812B: continued SAO RAS optical observation
  70. GRB230815A: BOOTES-6/DPRT optical upper limit
  71. GRB 230815A: Fermi GBM detection
  72. Fermi GRB 230814A: Global MASTER-Net observations report
  73. GRB 230812B: continued AbAO optical afterglow observations
  74. GRB 230812B: Optical observaions from Rozhen Observatory
  75. GRB 230812B: Upper limits from a neutrino search with IceCube
  76. GRB 230812B: GRANDMA further observations of ZTF23aaxeacr candidate afterglow
  77. GRB 230814A: BALROG localization (Fermi Trigger 713732101 / GRB 230814788)
  78. GRB 230812B: CrAO ZTSh optical observations
  79. GRB 230814A: Fermi GBM Final Real-time Localization
  80. GRB 230812B: Koshka Zeiss-1000 optical observations
  81. GRB 230812B: GIT optical follow-up
  82. GRB 230812B: Leavitt Observatory optical observations
  83. GRB 230812B : optical observations from Observatoire de Haute-Provence
  84. GRB 230812B: Bassano Bresciano Observatory optical observations
  85. GRB 230812B: Faulkes Telescope North optical afterglow follow-up
  86. GRB 230812B: AbAO optical observations
  87. GRB 230812B: Redshift from OSIRIS+/GTC
  88. Konus-Wind detection of GRB 230812B
  89. GRB230812B: AGILE/MCAL detection
  90. GRB 230812B: GECAM-C observation of a very bright burst
  91. GRB 230812B: Swift-XRT afterglow detection
  92. GRB 230812: Swift/UVOT Detection
  93. GRB 230812B: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi GRB (Trigger 713559497)
  94. Fermi GRB 230812B: MASTER optical counterpart
  95. GRB 230812B: KAIT Optical Afterglow Candidate
  96. GRB 230812B: Improved Swift/XRT localization
  97. GRB 230812B: Fermi-LAT detection
  98. GRB 230812B: Fermi GBM Observation of a very bright burst
  99. Fermi GRB 230812B: Global MASTER-Net observations report
  100. GRB 230812B: Tiled Swift observations

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