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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"

21525 results found.

  1. LXT240402A/GRB240402B: Chandra X-ray detection
  2. GRB 240419A: Possible ATCA radio detection
  3. GRB 240421B: ATCA radio observations
  4. LIGO/Virgo/KAGRA S240421ar: Upper limits from Swift/BAT-GUANO
  5. GRB 240419B : MITSuME Akeno optical upper limits
  6. GRB 240415B: Swift-XRT observations
  7. GRB 240415A: Swift-XRT refined Analysis
  8. GRB 240421B: AstroSat CZTI detection
  9. GRB240421B: Zadko Observations
  10. Swift GRB 240421B: Global MASTER-Net observations report
  11. GRB 240421B: Fermi GBM Observation
  12. GRB 240421B: Swift-XRT refined Analysis
  13. GRB240421B: BOOTES-5/JGT optical upper limit
  14. GRB 240421B: Swift/UVOT Upper Limits
  15. GRB 240421B: Enhanced Swift-XRT position
  16. GRB 240421B: Swift detection of a burst
  17. GRB240419A: Skynet Optical Afterglow Analysis
  18. GRB 240419B: Swift/UVOT Upper Limits
  19. GRB 240419A: Swift/UVOT Upper Limits
  20. GRB 240419B: Swift-XRT refined Analysis
  21. Swift GRB 240419B: Global MASTER-Net observations report
  22. GRB 240419B: Enhanced Swift-XRT position
  23. Swift GRB 240419A: Global MASTER-Net observations report
  24. GRB 240418A: Swift/UVOT Upper Limits
  25. GRB 240419A: Swift-XRT refined Analysis
  26. GRB 240418A: Swift-XRT refined Analysis
  27. GRB 240419B: Swift detection of a burst
  28. GRB 240411B: Swift/UVOT Detection
  29. GRB240418A: YAHPT Upper Limits
  30. GRB 240419A: VLT optical afterglow detection
  31. GRB 240419A: Enhanced Swift-XRT position
  32. GRB 240419A: Prompt enhanced Swift-XRT position
  33. GRB 240419A: Swift detection of a burst
  34. GRB 240418A: TSHAO Zeiss-1000 optical upper limit
  35. GRB 240418A: Enhanced Swift-XRT position
  36. GRB 240418A: AKO Upper Limit
  37. Swift GRB240418.85: Global MASTER-Net observations report
  38. GRB 240418A: Swift detection of a burst
  39. Improved IPN triangulation of GRB 240411A
  40. GRB 240415A: Glowbug gamma-ray detection
  41. GRB 240414A: Glowbug gamma-ray detection
  42. GRB 240415B: GECAM-B detection
  43. GRB 240415A: Swift-BAT refined analysis
  44. GRB 240411A: Glowbug gamma-ray detection
  45. GRB 240414A: Swift-BAT refined analysis
  46. GRB 240414A: AbAO optical upprer limit
  47. GRB 240415A: Swift/UVOT Detection
  48. GRB 240415A: Fermi GBM Observation
  49. GRB 240414A: GAD Observatory, La Spezia, Italy ,upper limit
  50. GRB 240415A: Enhanced Swift-XRT position
  51. GRB 240415B: Swift ToO observations
  52. GRB 240415B: Swift/BAT-GUANO Correction
  53. GRB 240415B: Swift/BAT-GUANO arcminute localization of a short burst
  54. GRB 240414A: Fermi GBM Observation
  55. GRB 240414A: Swift/UVOT Detection
  56. LXT 240402A/GRB 240402B: Swift follow-up observations
  57. GRB 240414A: Mondy optical observations
  58. GRB 240415A: Prompt Swift-XRT observations
  59. GRB 240415A: Swift detection of a burst
  60. GRB 240414A: Swift-XRT refined Analysis
  61. GRB 240414A: Enhanced Swift-XRT position
  62. GRB 240414A: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  63. GRB 240414A: Skynet Optical Afterglow Observations
  64. Swift GRB 240414A: Global MASTER-Net observations report
  65. IPN triangulation of GRB 240410A
  66. IPN triangulation of GRB 240411A
  67. GRB 240414A : MITSuME Akeno optical upper limits
  68. GRB 240414A : OHP/T193 optical counterpart detection
  69. GRB 240414A: Swift detection of a burst
  70. GRB 240411B: Swift-BAT refined analysis
  71. GRB 240411B: Swift-XRT refined Analysis
  72. GRB 240411B: 1.3m DFOT Optical observations
  73. GRB 240411B: Enhanced Swift-XRT position
  74. GRB 240411B: LCO optical afterglow detection
  75. GRB 240411B: Swift detection of a burst
  76. EP240408A: MASTER optical observations
  77. EP240408a: GROND detection of a candidate counterpart
  78. EP240408a: Swift follow-up observation
  79. Swift Trigger 1220736: detection of 4U 1543-62.
  80. Swift satellite resumes pointed science observations
  81. GRB 240318A: Fermi GBM Observation
  82. Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a)
  83. GRB 240315C / X-ray transient EP240315a: Swift/BAT detection
  84. GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  85. IPN triangulation of GRB 240315C (consistent with a fast X-ray transient EP240315a)
  86. GRB 240317B: Swift/BAT-GUANO Angular Error Correction
  87. GRB 240317B: Fermi GBM Observation
  88. Swift satellite in safe mode
  89. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  90. Einstein Probe detected of a fast X-ray transient EP240315a
  91. GRID detection of GRB 240306A
  92. Swift Triggers 1220155, 1220156, 1220157, 1220158, 1220160 and 1220161 were not astrophysical
  93. Swift Triggers 1220093, 1220094, 1220095 and 1220096 are not astrophysical
  94. Swift Triggers 1220090, 1220091 and 1220092 are not astrophysical
  95. GRB240204A: VIRT optical upper limit
  96. Swift triggers 1219917, 1219917 and 1219922 were not astrophysical
  97. Swift Trigger 1219909 and 1219910 are not a astrophysical
  98. Swift Trigger 1219905 is not a GRB
  99. Swift Trigger 1219874 is not astrophysical
  100. Swift GRB240309.61: Global MASTER-Net observations report

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