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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"

24615 results found.

  1. LIGO/Virgo S190510g: Updated localization from LIGO and Virgo data
  2. LIGO/Virgo S190510g: MAXI/GSC Observations
  3. LIGO/Virgo S190510g: ANTARES neutrino search
  4. S190510g: INTEGRAL inactive at the time of the event
  5. LIGO/Virgo S190510g: Potential host galaxies from the GLADE catalog
  6. LIGO/Virgo S190510g: Public DECam Observations
  7. LIGO/Virgo S190510g: Identification of a GW compact binary merger candidate
  8. LIGO/Virgo S190510g: HAWC follow-up
  9. Fermi GRB190510.12 Global MASTER-Net observations report
  10. LIGO/Virgo S190510g: Fermi GBM Observations
  11. LIGO-Virgo S190510g: AGILE MCAL observations
  12. LIGO/Virgo S190510g Global MASTER-Net observations report
  13. LIGO/Virgo S190510g: IceCube Neutrino Search
  14. LIGO/Virgo S190503bf: TAROT-GRANDMA observation report
  15. GRB 190508B: Fermi GBM Final Real-time Localization
  16. Fermi GRB190508.81 Global MASTER-Net observations report
  17. GRB 190508A: Fermi GBM Final Real-time Localization
  18. Fermi GRB190507.71 Global MASTER-Net observations report
  19. Fermi GRB190508.11 Global MASTER-Net observations report
  20. Fermi GRB190507.97 Global MASTER-Net observations report
  21. GRB 190507B: Fermi GBM Final Real-time Localization
  22. Fermi GRB190507.27 Global MASTER-Net observations report
  23. LIGO/Virgo S190426c: Konus-Wind observations
  24. LIGO/Virgo S190425z: Konus-Wind observations
  25. IceCube-190504A: MASTER optical monitoring analysis
  26. LIGO/Virgo S190503bf: AstroSat CZTI upper limits
  27. Fermi Trigger 578903308 / GRB 190507270 / GRB190507A: BALROG localization
  28. GRB 190507A: Fermi GBM Final Real-time Localization
  29. Fermi GRB190506.58 Global MASTER-Net observations report
  30. LIGO/Virgo S190426c: Update on Source Classification
  31. Search for additional neutrino events from the direction of IceCube-190504A with IceCube
  32. Search for additional neutrino events from the direction of IceCube-190503A with IceCube
  33. Update to the Fermi GBM GCN Reporting
  34. IceCube-190504A: Insight-HXMT/HE observation
  35. GRB 190501A: CALET Gamma-Ray Burst Monitor detection
  36. IceCube-190504A: Swift-XRT Follow-up Observations
  37. IceCube-190503A: Swift-XRT Follow-up Observations
  38. LIGO/Virgo S190503bf: CALET Observations
  39. Fermi GRB190505.82 Global MASTER-Net observations report
  40. Fermi-LAT Gamma-ray Observations of IceCube-190504A
  41. Search for counterpart to IceCube-190504A with ANTARES
  42. IceCube-190503A: Insight-HXMT/HE observation
  43. Fermi GRB190505.05 Global MASTER-Net observations report
  44. Fermi GRB190504.68 Global MASTER-Net observations report
  45. LIGO/Virgo S190503bf Global MASTER-Net observations report
  46. IceCube-190504A: MASTER optical follow-up observations
  47. IceCube-190503A: Lick/KAIT Follow-Up Observations
  48. IceCube-190504A - IceCube observation of a high-energy neutrino candidate event
  49. LIGO/Virgo S190503bf: Swift/BAT Counterpart Search
  50. LIGO/Virgo S190503bf: Fermi-LAT search for a high-energy gamma-ray counterpart
  51. LIGO/Virgo S190503bf: Insight-HXMT/HE observation
  52. IceCube-190503A: Insight-HXMT/HE observation
  53. LIGO/Virgo S190503bf: ANTARES neutrino search
  54. Fermi-LAT Gamma-ray Observations of IceCube-190503A
  55. LIGO/Virgo S190503bf: Fermi-GBM Observations
  56. LIGO/Virgo S190503bf: MAXI/GSC Observations
  57. LIGO/Virgo S190503bf: AGILE-GRID Observations
  58. IceCube-190503A: INTEGRAL prompt observation
  59. LIGO/Virgo S190503bf: INTEGRAL prompt observation
  60. LIGO/Virgo S190503bf: AGILE MCAL observations
  61. IceCube-190503A - IceCube observation of a high-energy neutrino candidate event
  62. LIGO/Virgo S190503bf: Identification of a GW compact binary merger candidate
  63. LIGO/Virgo S190503bf: IceCube Neutrino Search
  64. LIGO/Virgo S190421ar: Updated localization and classification from LIGO and Virgo data
  65. IPN Triangulation of GRB 190501A (long/bright)
  66. LIGO/Virgo S190425z: Insight-HXMT observation and counterpart search
  67. Fermi Trigger 578462495 / GRB 190502168 / GRB190502A: BALROG localization
  68. Fermi GRB190501.79 Global MASTER-Net observations report
  69. GRB 190501A: AGILE/GRID detection
  70. LIGO/Virgo S190426c: Swift rapid follow-up observations of S190425z and S190426c and URL for observation log for all future events
  71. LIGO/Virgo S190412m: Further J-GEM optical/NIR observations
  72. Fermi GRB190429.74 Global MASTER-Net observations report
  73. LIGO/Virgo S190426c: YAHPT Optical Observation
  74. LIGO/Virgo S190426c: Fermi-LAT search for a high-energy gamma-ray counterpart
  75. GRB 190427A: CALET Gamma-Ray Burst Monitor detection
  76. LIGO/Virgo S190425z: MASTER detection of the faint flare in SDSS Seyfert galaxy z = 0.09
  77. LIGO/Virgo S190426c: Continued LOAO Observation
  78. Fermi Trigger 578170097 / GRB 190428783 / GRB190428A: BALROG localization
  79. LIGO/Virgo S190426c: Additional Candidates from the Zwicky Transient Facility
  80. GRB 190427A, Swift-BAT refined analysis
  81. LIGO/Virgo S190426c: Continued infrared wide-field search with Palomar Gattini-IR
  82. LIGO/Virgo S190425z : IRSF/SIRIUS NIR photometric follow-up observation of the Swift/UVOT Transient
  83. LIGO/Virgo S190426c: OAJ-GRANDMA observation report
  84. LIGO/Virgo S190425z: MASTER explanation of the nature of an optical flash detected by a Swift as a short flare on a fast-moving WISE brown
  85. LIGO/Virgo S190426c: ASAS-SN observations
  86. LIGO/Virgo S190426c: LOAO Observation
  87. LIGO/Virgo S190425z: NOT photometry of ZTF19aasckkq
  88. LIGO/Virgo S190426c: GROWTH India follow-up
  89. LIGO/Virgo S190425z: SVOM/GWAC-F60A observations
  90. LIGO/Virgo S190425z: Additional Candidates from the Zwicky Transient Facility
  91. LIGO/Virgo S190425z: ASAS-SN observations
  92. Correction to GCN Circular 24301: LIGO/Virgo S190425z: Lulin observations of the Swift/UVOT transient
  93. LIGO/Virgo S190425z: ZTF photometry of the UVOT transient candidate hours before discovery
  94. LIGO/Virgo S190425z: Lulin observations of the Swift/UVOT transient
  95. LIGO/Virgo S190426c: J-GEM optical/NIR follow-up observations
  96. Fermi GRB190427.19 Global MASTER-Net observations report
  97. GRB 190427A: Fermi GBM detection
  98. LIGO/Virgo S190426c: MMT Follow-Up Observations
  99. GRB 190427A: Lick/Nickel telescope optical observations
  100. LIGO/Virgo S190426c: Lick/KAIT Follow-Up Observations

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