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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"

5164 results found.

  1. LIGO/Virgo S230618ba: Global MASTER-Net observations report
  2. GRB 230618A: Swift-XRT refined Analysis
  3. LIGO/Virgo S230616aa: Global MASTER-Net observations report
  4. LIGO/Virgo S230618d: Global MASTER-Net observations report
  5. LIGO/Virgo S230617bc: Global MASTER-Net observations report
  6. LIGO/Virgo S230617aq: Global MASTER-Net observations report
  7. LIGO/Virgo/KAGRA S230615az: T80S Search and Candidate Counterpart Identification
  8. LIGO/Virgo S230616s: Global MASTER-Net observations report
  9. LIGO/Virgo S230615be: Global MASTER-Net observations report
  10. LIGO/Virgo S230615i: Global MASTER-Net observations report
  11. LIGO/Virgo S230609u: Global MASTER-Net observations report
  12. LIGO/Virgo S230608aw: Global MASTER-Net observations report
  13. LIGO/Virgo S230609a: Global MASTER-Net observations report
  14. LIGO/Virgo S230608ah: Global MASTER-Net observations report
  15. LIGO/Virgo S230608q: Global MASTER-Net observations report
  16. ZTF23aamxeqf/AT2023jxk: 1.3m DFOT Optical upper limit
  17. LIGO/Virgo/KAGRA S230608as: Identification of a GW compact binary merger candidate
  18. Fermi GRB 230603A: Global MASTER-Net observations report
  19. Fermi trigger No 707039690: Global MASTER-Net observations report
  20. GRB 230606A: Swift-XRT refined Analysis
  21. LIGO/Virgo/KAGRA S230606d: Identification of a GW compact binary merger candidate
  22. LIGO/Virgo S230604z: Global MASTER-Net observations report
  23. LIGO/Virgo S230529ay: Global MASTER-Net observations report
  24. LIGO/Virgo S230525a: Global MASTER-Net observations report
  25. Fermi-LAT gamma-ray observations of IceCube-230524A
  26. IceCube-230524A: Upper limits from a search for additional neutrino events in IceCube
  27. GRB 230524A: Fermi GBM Observation
  28. IceCube Alert 230524.47: Global MASTER-Net observations report
  29. IceCube-230524A - IceCube observation of a high-energy neutrino candidate track-like event
  30. GRB 230524B: AstroSat CZTI detection
  31. GRB 230524A: AstroSat CZTI detection
  32. GRB 230524A: AGILE detection
  33. Fermi trigger No 706610076: Global MASTER-Net observations report
  34. LIGO/Virgo S230524b: Global MASTER-Net observations report
  35. GRB 230524A: Fermi GBM Final Real-time Localization
  36. Fermi trigger No 706599831: Global MASTER-Net observations report
  37. Fermi trigger No 706536788: Global MASTER-Net observations report
  38. LIGO/Virgo S230522a: Global MASTER-Net observations report
  39. LIGO/Virgo S230521k: Global MASTER-Net observations report
  40. LIGO/Virgo S230520ae: Global MASTER-Net observations report
  41. Fermi trigger No 706317104: Global MASTER-Net observations report
  42. GRB 230520A: CALET Gamma-Ray Burst Monitor detection
  43. LIGO/Virgo/KAGRA S230518h: GECKO tiling observations with KMTNet
  44. GRB 230520A: MAXI/GSC detection
  45. LIGO/Virgo/KAGRA S230518h: Swope Search and Candidate Counterpart Identification
  46. LIGO/Virgo/KAGRA S230518h: Coverage and upper limits from MAXI/GSC observations
  47. LIGO/Virgo S230518h: Global MASTER-Net observations report
  48. GRB 230510A: GRBAlpha detection
  49. Fermi trigger No 705565670: Global MASTER-Net observations report
  50. GRB 230510A: OHP/T193 and OHP/T120 optical observations
  51. GRB 230511D: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705537623)
  52. GRB 230510A: Swift-XRT refined Analysis
  53. Fermi trigger No 705413051: Global MASTER-Net observations report
  54. GRB 230506B: Swift-XRT refined Analysis
  55. GRB 230506C: Swift-XRT analysis
  56. GRB 230506C: TSHAO possible afterglow candidate
  57. GRB 230427A: Nanshan/HMT optical upper limit
  58. Fermi trigger No 704365743: Global MASTER-Net observations report
  59. GRB 230427A: MITSuME Akeno optical upper limits
  60. GRB 230426A: Fermi GBM Detection
  61. Fermi trigger No 704233744: Global MASTER-Net observations report
  62. GRB 230426A: Fermi GBM Final Real-time Localization
  63. Konus-Wind detection of GRB 230418A
  64. GRB 230420A: MITSuME Akeno optical observation
  65. GRB 230402A: Fermi GBM detection
  66. GRB 230402A: Fermi-LAT detection
  67. Fermi GRB 230414A: Global MASTER-Net observations report
  68. Fermi GRB 230409A: Global MASTER-Net observations report
  69. GRB 230409B: Swift-XRT refined Analysis
  70. MAXI GRB230408.82: Global MASTER-Net observations report
  71. IceCube Alert 230405.56: Global MASTER-Net observations report
  72. GRB 230307A: further analysis of the Konus-Wind detection and rest-frame energetics
  73. GRB 230328B: Swift/UVOT Detection
  74. Fermi trigger No 701883729: Global MASTER-Net observations report
  75. Konus-Wind detection of GRB 230328B
  76. GRB 230328B: Swift-XRT refined Analysis
  77. GRB 230328B: Mondy optical afterglow confirmation
  78. GRB 230328B: Swift detection of a burst with an optical afterglow
  79. GRB 230328A: Fermi GBM Final Real-time Localization
  80. GRB 230325A: Swift-XRT refined Analysis
  81. Fermi trigger No 701313046: Global MASTER-Net observations report
  82. Fermi trigger No 701321709: Global MASTER-Net observations report
  83. GRB 230322B: Swift-XRT refined Analysis
  84. Fermi trigger No 701071944: Global MASTER-Net observations report
  85. Fermi trigger No 701058254: Global MASTER-Net observations report
  86. GRB 230321B: AstroSat CZTI detection
  87. GRB 230314A: TURBO Optical Upper Limit
  88. Trigger 1160641: Swift detection of 4U 1630-472 (a.k.a. SWIFT J1633.8-4724A)
  89. IPN triangulation of GRB 230304B
  90. GRB 230314A: Fermi GBM Final Real-time Localization
  91. Further improved IPN localization for GRB 230307A
  92. Triggers 1159434, 1159435 and 1159437: Swift detection of Sco X-1 due to Star Tracker loss of lock
  93. Trigger 1159327: Swift detection of SGR1806-20
  94. IceCube Alert 230306.46: Global MASTER-Net observations report
  95. Fermi trigger No 699294715: Global MASTER-Net observations report
  96. GRB 230228A: Swift-XRT refined Analysis
  97. Fermi GRB 230227A: Global MASTER-Net observations report
  98. Fermi trigger No 699029364: Global MASTER-Net observations report
  99. GRB 230217A: Gemini-South Optical Observation
  100. GRB 230220A: MAXI/GSC detection

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