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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').
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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.

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subject:"Swift"
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submitter:"Judith Racusin"

21952 results found.

  1. LIGO/Virgo/KAGRA S240601co: Upper limits from Swift/BAT-GUANO
  2. LIGO/Virgo/KAGRA S240530a: Upper limits from Swift/BAT-GUANO
  3. GRB 240529A: MASTER prompt OT detection
  4. GRB 240529A: continued SAO RAS optical observations
  5. The EP-WXT source triggered on June 1st is likely a flaring star
  6. GRB 240529A: further SAO RAS optical observations
  7. LIGO/Virgo/KAGRA S240601co: Identification of a GW compact binary merger candidate
  8. Swift Trigger 1232465 is not a GRB
  9. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  10. GRB 240529A: 1.3m DFOT Optical observations
  11. LIGO/Virgo/KAGRA S240601aj: Identification of a GW compact binary merger candidate
  12. GRB 240529A : Mondy optical observations
  13. GRB 240529A: SAO RAS optical observations
  14. LIGO/Virgo/KAGRA S240531bp: Identification of a GW compact binary merger candidate
  15. GRB 240529A: optical photometry from Konkoly
  16. GRB 240529A: GROWTH-India optical follow-up
  17. GRB 240529A: T193/MISTRAL observations
  18. GRB 240529A: Redshift from GTC/OSIRIS+
  19. GRB 240529A: AKO Optical Afterglow Detection
  20. LIGO/Virgo/KAGRA S240530a: Identification of a GW compact binary merger candidate
  21. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  22. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  23. GRB 240529A: J-band detections with WINTER
  24. GRB 240529A: Skynet Optical Observations
  25. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  26. GRB 240529A: Swift/UVOT Detection
  27. GRB 240529A: NOT optical observations
  28. GRB 240529A: AstroSat CZTI detection
  29. GRB 240527B: Swift-XRT afterglow detection
  30. GRB 240529A: Enhanced Swift-XRT position
  31. GRB 240529A: Swift detection of a burst with an optical counterpart
  32. Swift GRB240529.12: Global MASTER-Net observations report
  33. LIGO/Virgo/KAGRA S240527fv: Identification of a GW compact binary merger candidate
  34. LIGO/Virgo/KAGRA S240527en: Identification of a GW compact binary merger candidate
  35. LIGO/Virgo/KAGRA S240525p: Identification of a GW compact binary merger candidate
  36. GRB 240523A: Enhanced Swift-XRT position
  37. GRB 240523A: Swift detection of a burst
  38. LIGO/Virgo/KAGRA S240520cv: Updated Sky localization and EM Bright Classification
  39. GRB 240516B: AstroSat CZTI detection
  40. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  41. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  42. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO
  43. LIGO/Virgo/KAGRA S240520cv: Identification of a GW compact binary merger candidate
  44. GRB 240514B: VZLUSAT-2 detection
  45. GRB 240504A: VZLUSAT-2 detection
  46. GRB 240502A: VZLUSAT-2 detection
  47. GRB 240519A: GRBAlpha detection
  48. GRB 240516A: Swift/UVOT Upper Limits
  49. EP240518a: possibly identified with a flare star by EP-FXT
  50. EP240518a: EP-WXT detection of a new X-ray transient
  51. GRB 240516A: Swift-BAT refined analysis
  52. IPN triangulation of GRB 240514B (short)
  53. GRB 240511A: Observations from GTC/OSIRIS+
  54. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  55. GRB 240516A: Swift detection of a burst
  56. GRB 240511A: radio detection of afterglow candidate
  57. GRB 240514B: GOTO candidate optical counterpart
  58. GRB 240514B: GRBAlpha detection
  59. LIGO/Virgo/KAGRA S240515m: Identification of a GW compact binary merger candidate
  60. LIGO/Virgo/KAGRA S240514x: Identification of a GW compact binary merger candidate
  61. LIGO/Virgo/KAGRA S240514c: Identification of a GW compact binary merger candidate
  62. transient: Xinglong Nearby Galaxy Supernova Survey detection of AT2024iss
  63. LIGO/Virgo/KAGRA S240507p: Upper limits from Swift/BAT-GUANO
  64. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  65. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  66. LAT GRB240513.31: Global MASTER-Net observations report
  67. GRB 240513A: Fermi-LAT detection
  68. LIGO/Virgo/KAGRA S240513ei: Identification of a GW compact binary merger candidate
  69. GRB 240511A: Swift-BAT refined analysis
  70. GRB 240513A: AstroSat CZTI detection
  71. GRB 240511A: J-band observations with WINTER
  72. GRB 240511A: Enhanced Swift-XRT position
  73. GRB 240511A : MITSuME Akeno optical upper limits
  74. LIGO/Virgo/KAGRA S240512r: Updated Sky localization and EM Bright Classification
  75. GRB 240511A: Swift-XRT refined Analysis
  76. LIGO/Virgo/KAGRA S240512r: Identification of a GW compact binary merger candidate
  77. GRB 240511A: Swift detection of a burst
  78. LIGO/Virgo/KAGRA S240511i: Identification of a GW compact binary merger candidate
  79. LIGO/Virgo/KAGRA S240422ed: GMOS-S photometry of J-GEM24a
  80. LIGO/Virgo/KAGRA S240422ed: P200 observations of AT2024hit
  81. LIGO/Virgo/KAGRA S240422ed: Candidates from the latest GW-MMADS DECam Observations
  82. EP240506a: Xinglong optical upper limit
  83. EP240506a: Archival radio searching
  84. EP240506a: TRT optical upper limit
  85. EP240506a: BOOTES Network optical upper limit
  86. LIGO/Virgo/KAGRA S240507p: Updated Sky localization and EM Bright Classification
  87. EP240506a: Optical upper limit with Kinder observations
  88. IPN triangulation of GRB 240504A
  89. GRB 240502A: 1.3m DFOT Optical upper limit
  90. EP240506a: EP-WXT detection of a new fast X-ray transient
  91. LIGO/Virgo/KAGRA S240507p: Identification of a GW compact binary merger candidate
  92. LIGO/Virgo/KAGRA S240422ed: Additional WINTER near-infrared J-band observations
  93. LIGO/Virgo/KAGRA S240505av: Updated Sky localization and EM Bright Classification
  94. LIGO/Virgo/KAGRA S240505av: Identification of a GW compact binary merger candidate
  95. IceCube-240424A: GRANDMA Optical Upper Limit of Fermi J2151.3+0220
  96. GW170817: VLA observations at ~5.5 yrs since merger
  97. GRB 240503A: AstroSat CZTI detection
  98. GRB 240502A: GOTO optical upper limit
  99. GRB 240415A 1.3m DFOT Optical upper limit
  100. LIGO/Virgo/KAGRA S240501an: Updated Sky localization and EM Bright Classification

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