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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"

23734 results found.

  1. Fermi trigger No 716419312: Global MASTER-Net observations report
  2. GRB 230913A: Glowbug gamma-ray detection
  3. LIGO/Virgo/KAGRA S230914ak: Identification of a GW compact binary merger candidate
  4. Swift Trigger 1191994 is not an astrophysical event
  5. Swift GRB230913.70: Global MASTER-Net observations report
  6. Swift GRB230913.70: Global MASTER-Net observations report
  7. Swift Trigger 1191903 is not an astrophysical event
  8. Fermi GRB 230913A: Global MASTER-Net observations report
  9. GRB 230911A: GOTO optical counterpart candidate
  10. GRB 230908A: CALET Gamma-Ray Burst Monitor detection
  11. GRB 230911B: AstroSat CZTI detection
  12. GRB 230911C: Swift-BAT refined analysis
  13. GRB230911C: BOOTES-6/DPRT optical upper limit
  14. Swift GRB 230911C: Global MASTER-Net observations report
  15. IPN triangulation of GRB 230911D (long)
  16. GRB 230911B: GRBAlpha and VZLUSAT-2 joint detection
  17. Fermi trigger No 716145795: Global MASTER-Net observations report
  18. GRB 230911C: GOTO optical upper limits
  19. Konus-Wind detection of GRB 230811D
  20. GRB 230911C: Swift detection of a burst
  21. Fermi GRB 230911B: Global MASTER-Net observations report
  22. GRB 230908A: GRBAlpha detection
  23. LIGO/Virgo/KAGRA S230908b: one counterpart neutrino candidate from IceCube neutrino searches
  24. Glowbug gamma-ray detection GRB 230905B
  25. GRB 230906A: Swift/UVOT Upper Limits
  26. GRB 230818A: radio observation with the VLA
  27. GRB 230205A: LBT spectroscopy of two host galaxy candidates
  28. Konus-Wind detection of GRB 230906A (short)
  29. IPN triangulation of GRB 230906A (short)
  30. Fermi GRB 230906A: Global MASTER-Net observations report
  31. GRB 230812B: Chandra late-time detection of the X-ray afterglow
  32. GRB 230905B: GECAM-C detection of a long burst
  33. GRB 230903A: Swift-BAT refined analysis
  34. Fermi trigger No 715552087: Global MASTER-Net observations report
  35. Fermi trigger No 715429986: Global MASTER-Net observations report
  36. Fermi GRB 230903A: Global MASTER-Net observations report
  37. LIGO/Virgo/KAGRA S230904n: 1 counterpart neutrino candidate from IceCube neutrino searches
  38. Fermi GRB 230904A: Global MASTER-Net observations report
  39. LIGO/Virgo/KAGRA S230904n: Identification of a GW compact binary merger candidate
  40. GRB 230903A: Swift detection of a burst
  41. Swift GRB230903.72: Global MASTER-Net observations report
  42. Integral GRB230902.00: Global MASTER-Net observations report
  43. LIGO/Virgo/KAGRA S230831e: Identification of a GW compact binary merger candidate
  44. GRB 230827B: Glowbug gamma-ray detection
  45. GRB 230827A: Glowbug gamma-ray detection
  46. GRB 230826A: Glowbug gamma-ray detection
  47. GRB 230827B: Swift-XRT afterglow detection
  48. GRB 230827B: CALET Gamma-Ray Burst Monitor detection
  49. GRB 230826A: Swift-BAT refined analysis
  50. GRB 230828A: AstroSat CZTI detection
  51. GRB 230828A: GRBAlpha detection
  52. GRB 230827A: VZLUSAT-2 detection
  53. GRB 230826A: VZLUSAT-2 detection
  54. GRB 230827B: VZLUSAT-2 detection
  55. GRB 230827A: GRBAlpha detection
  56. Fermi trigger No 714809315: Global MASTER-Net observations report
  57. GRB 230827.256: AKO Optical follow-up of ZTF23abaanxz (AT 2023qxj)
  58. Fermi GRB 230827A: Global MASTER-Net observations report
  59. Swift J1727.8-1613 (GRB 230824A): Osservatorio Astronomico "Nastro Verde" optical observations
  60. GRB 230827.256 : GIT optical follow-up of ZTF23abaanxz/AT2023qxj
  61. Swift J1727.8-1613 (GRB 230824A): Montarrenti Observatory photometric observations
  62. GRB 230826A: GRBAlpha detection
  63. Swift J1727.8-1613 (GRB 230824A): Leavitt Observatory optical observations
  64. GRB 230826A: Swift-XRT refined Analysis
  65. Swift J1727.8-1613 (GRB 230824A): GAD Observatory La Spezia - optical observations
  66. GRB 230826A: Swift detection of a burst
  67. Swift GRB230826.81: Global MASTER-Net observations report
  68. Swift J1727.8-1613 (GRB 230824A): Bassano Bresciano Observatory optical observations
  69. GRB 230818B: CALET Gamma-Ray Burst Monitor detection
  70. Swift GRB230825.85: Global MASTER-Net observations report
  71. Trigger 1187225: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  72. Trigger 1187207: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  73. Trigger 1187203: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  74. Swift GRB230825.75: Global MASTER-Net observations report
  75. GRB 230812B: radio detection with the VLA
  76. Swift Trigger 1187199 is not an astrophysical event
  77. NICER detection of Swift J1727.8-1613 (GRB 230824A)
  78. LIGO/Virgo/KAGRA S230825k: Identification of a GW compact binary merger candidate
  79. Fermi trigger No 714618399: Global MASTER-Net observations report
  80. MAXI/GSC detection of Swift J1727.8-1613 (GRB 230824A)
  81. Trigger 1186982: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  82. Integral GRB230824.72: Global MASTER-Net observations report
  83. GRB 230824A: Swift detection of a burst
  84. Swift GRB230824.58: Global MASTER-Net observations report
  85. LIGO/Virgo/KAGRA S230824r: Identification of a GW compact binary merger candidate
  86. Swift GRB230824.10: Global MASTER-Net observations report
  87. Swift Trigger 1186908 is not a GRB
  88. GRB 230812B: AstroSat LAXPC detection
  89. GRB 230818B: VZLUSAT-2 detection
  90. GRB 230818B: AstroSat CZTI detection
  91. GRB 230812B: Assy optical observations, possible SN rise
  92. GRB 230815A: ATCA detection of radio counterpart
  93. Swift GRB230821.64: Global MASTER-Net observations report
  94. GRB 230812B: SAO RAS RC-500 and Zeiss-1000 observations
  95. GRB 230818A: Swift-BAT refined analysis
  96. GRB 20230818A: GIT optical upper limit
  97. Konus-Wind detection of GRB 230818A
  98. GRB 230812B : GRANDMA/Kilonova-Catcher optical afterglow detection and upper limits
  99. Swift GRB230820.81: Global MASTER-Net observations report
  100. Swift GRB230820.80: Global MASTER-Net observations report

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