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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"
  1. LIGO/Virgo S190510g : Xinglong-60cm upper limit of the GRAWITA REM's OT
  2. LIGO/Virgo S190510g: MASTER OT independ detection in WISE J060606.26-353233.9 galaxy at desgw-190510a position.
  3. LIGO/Virgo S190510g: Unconfirmed OT in PGC 094244
  4. LIGO/Virgo S190510g: Dabancheng/HMT Follow-Up Observations
  5. LIGO/Virgo S190510g: Xinglong/Schmidt Follow-Up Observations
  6. LIGO/Virgo S190510g: DESGW counterpart candidate (desgw-190510a)
  7. LIGO/Virgo S190510g: Pierre Auger Observatory follow-up
  8. GRB 190511A: Swift detection of a burst
  9. GRB 190511A: Fermi GBM Final Real-time Localization
  10. LIGO/Virgo S190510g: MASTER possible OT in PGC094244 galaxy
  11. LIGO/Virgo S190510g: Insight-HXMT/HE updated observation
  12. LIGO/Virgo S190510g: SOAR/Goodman follow-up observations
  13. LIGO/Virgo S190510g: Optical Counterpart Candidates from DECam-GROWTH
  14. LIGO/Virgo S190510g: KMTNet observation
  15. LIGO/Virgo S190510g: CNEOST Follow-Up Observations
  16. LIGO/Virgo S190510g: J-GEM optical/NIR follow-up observations
  17. LIGO/Virgo S190510g: Lick/KAIT Follow-Up Observations
  18. LIGO/Virgo S190510g: Updated classification and data quality report
  19. LIGO/Virgo S190510g: Lulin Optical Follow-up Observations
  20. LIGO/Virgo S190510g: Fermi-LAT search for a high-energy gamma-ray counterpart
  21. LIGO/Virgo S190425z: CAHA-GRANDMA Observation of the Swift UVOT Source
  22. LIGO-Virgo S190426c: Pan-STARRS non-detection of ZTF19aassfws
  23. LIGO-Virgo S190510g: AGILE GRID observations
  24. LIGO/Virgo S190510g: Potential host galaxies on the updated skymap from the GLADE catalog
  25. LIGO/Virgo S190510g: GRAWITA REM optical observations
  26. LIGO/Virgo S190510g: Swift/BAT Counterpart Search
  27. LIGO/Virgo S190510g: CLU/NED Galaxies in the Localization Volume
  28. Konus-Wind observation of GRB 190501A
  29. LIGO/Virgo S190510g: Insight-HXMT/HE observation
  30. LIGO/Virgo S190510g: HSC Y-band follow-up observation
  31. GRB 190510A: Fermi GBM Final Real-time Localization
  32. LIGO/Virgo S190510g: Updated localization from LIGO and Virgo data
  33. LIGO/Virgo S190510g: MAXI/GSC Observations
  34. LIGO/Virgo S190510g: ANTARES neutrino search
  35. S190510g: INTEGRAL inactive at the time of the event
  36. LIGO/Virgo S190510g: Potential host galaxies from the GLADE catalog
  37. LIGO/Virgo S190510g: Public DECam Observations
  38. LIGO/Virgo S190510g: Identification of a GW compact binary merger candidate
  39. LIGO/Virgo S190510g: HAWC follow-up
  40. LIGO/Virgo S190426c: Archival VLASS Observations of ZTF19aassfws 14 days prior to Merger
  41. Fermi GRB190510.12 Global MASTER-Net observations report
  42. LIGO/Virgo S190510g: Fermi GBM Observations
  43. LIGO-Virgo S190510g: AGILE MCAL observations
  44. LIGO/Virgo S190510g Global MASTER-Net observations report
  45. LIGO/Virgo S190510g: IceCube Neutrino Search
  46. LIGO/Virgo S190426c: Correction to typo in GCN 24433
  47. LIGO/Virgo S190426c: INT Observations of ZTF19aassfws
  48. GRB 190508A: GOTO optical search - no counterparts
  49. LIGO/Virgo S190503bf: TAROT-GRANDMA observation report
  50. LIGO/Virgo S190426c: Discovery Channel Telescope Follow-Up of ZTF19aassfws
  51. GRB 190508B: Fermi GBM Final Real-time Localization
  52. Fermi GRB190508.81 Global MASTER-Net observations report
  53. GRB 190508A: Fermi GBM Final Real-time Localization
  54. Fermi GRB190507.71 Global MASTER-Net observations report
  55. GRB 190507B: GOTO optical counterpart search
  56. Fermi GRB190508.11 Global MASTER-Net observations report
  57. Fermi GRB190507.97 Global MASTER-Net observations report
  58. GRB 190507B: Fermi GBM Final Real-time Localization
  59. Fermi GRB190507.27 Global MASTER-Net observations report
  60. LIGO/Virgo S190426c (BHNS candidate): Implications from Numerical Relativity
  61. GRB 190501A: Swift XRT and UVOT Observations
  62. LIGO/Virgo S190426c: Konus-Wind observations
  63. LIGO/Virgo S190425z: Konus-Wind observations
  64. IceCube-190504A: MASTER optical monitoring analysis
  65. LIGO/Virgo S190503bf: AstroSat CZTI upper limits
  66. Fermi Trigger 578903308 / GRB 190507270 / GRB190507A: BALROG localization
  67. GRB 190507A: Fermi GBM Final Real-time Localization
  68. Fermi GRB190506.58 Global MASTER-Net observations report
  69. LIGO/Virgo S190426c: Update on Source Classification
  70. Search for additional neutrino events from the direction of IceCube-190504A with IceCube
  71. Search for additional neutrino events from the direction of IceCube-190503A with IceCube
  72. Update to the Fermi GBM GCN Reporting
  73. IceCube-190504A: Insight-HXMT/HE observation
  74. GRB 190501A: CALET Gamma-Ray Burst Monitor detection
  75. IceCube-190504A: Swift-XRT Follow-up Observations
  76. IceCube-190503A: Swift-XRT Follow-up Observations
  77. LIGO/Virgo S190503bf: CALET Observations
  78. Fermi GRB190505.82 Global MASTER-Net observations report
  79. Fermi-LAT Gamma-ray Observations of IceCube-190504A
  80. Search for counterpart to IceCube-190504A with ANTARES
  81. IceCube-190503A: Insight-HXMT/HE observation
  82. Fermi GRB190505.05 Global MASTER-Net observations report
  83. Fermi GRB190504.68 Global MASTER-Net observations report
  84. LIGO/Virgo S190503bf Global MASTER-Net observations report
  85. IceCube-190504A: MASTER optical follow-up observations
  86. IceCube-190503A: Lick/KAIT Follow-Up Observations
  87. IPN triangulation of GRB 190504A (short)
  88. IceCube-190504A - IceCube observation of a high-energy neutrino candidate event
  89. LIGO/Virgo S190503bf: Swift/BAT Counterpart Search
  90. LIGO/Virgo S190503bf: Fermi-LAT search for a high-energy gamma-ray counterpart
  91. LIGO/Virgo S190503bf: Insight-HXMT/HE observation
  92. IceCube-190503A: Insight-HXMT/HE observation
  93. LIGO/Virgo S190503bf: ANTARES neutrino search
  94. Fermi-LAT Gamma-ray Observations of IceCube-190503A
  95. LIGO/Virgo S190503bf: Fermi-GBM Observations
  96. Fermi-GBM Observations of IceCube-190503A
  97. LIGO/Virgo S190503bf: MAXI/GSC Observations
  98. LIGO/Virgo S190503bf: AGILE-GRID Observations
  99. IceCube-190503A: INTEGRAL prompt observation
  100. LIGO/Virgo S190503bf: INTEGRAL prompt observation

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