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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"

5178 results found.

  1. GRB 190828B: Swift-XRT refined Analysis
  2. LIGO/Virgo S190828j: No counterpart candidates in KAIT observations
  3. LIGO/Virgo S190814bv: CFHTphotometryof AT2019npv
  4. LIGO/Virgo S190814bv: Radio non-detection of DG19wxnjc/AT2019npv with the VLA
  5. LIGO/Virgo S190814bv: LCO Photometry of DG19wxnjc/AT2019npv
  6. GRB 190824A: Swift-XRT refined Analysis
  7. GRB 190824A: Fermi GBM observation
  8. Fermi trigger No 588350802 Global MASTER-Net observations report
  9. GRB 190824A: Fermi GBM Final Real-time Localization
  10. LIGO/Virgo S190814bv: Keck NIRES spectroscopy of DG19wxnjc/AT2019npv
  11. Fermi trigger No 588185734 Global MASTER-Net observations report
  12. Fermi GBM-190816: MASTER-Net optical observation report
  13. LIGO/Virgo S190814bv: No radio counterpart detected in ASKAP observations
  14. GRB 190821A: Swift-XRT refined Analysis
  15. LIGO/Virgo S190814bv: No Optical Counterpart Candidates in Second-Epoch Lick/KAIT Observations
  16. LIGO/Virgo S190814bv: Further Pan-STARRS observations and transient sources
  17. IceCube-190819A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  18. LIGO/Virgo S190814bv: Keck/MOSFIRE NIR spectroscopy of DG19njmjc (= AT 2019nra)
  19. LIGO/Virgo S190814bv: Prioritization of Counterpart Candidates based on a Photometric Redshift Analysis by the DECam-GROWTH Team
  20. LIGO/Virgo S190814bv: GRAWITA TNG infrared imaging of desgw-190814e, DG19sevhc and selected galaxies
  21. LIGO/Virgo S190814bv : No Counterpart Candidates in Continued Galaxy Targeted Search with Magellan
  22. LIGO/Virgo S190814bv: no candidates from optical imaging of selected galaxies at the NOT
  23. LIGO/Virgo S190814bv: GROND imaging of candidate galaxies
  24. GRB 190816A: Swift detection of a burst
  25. LIGO/Virgo S190814bv : No Counterpart Candidates in Galaxy Targeted Search with Magellan
  26. LIGO/Virgo S190814bv: GRAWITA TNG infrared imaging of selected galaxies
  27. LIGO/VIRGO S190814bv: No candidates from Pan-STARRS and non-detection of AT2019nme
  28. LIGO/Virgo S190814bv: No counterpart candidates in KAIT observations
  29. LIGO/Virgo S190814bv: no counterpart candidates in Thacher imaging
  30. LIGO/Virgo S190814bv: no counterpart candidates in Swope imaging
  31. LIGO/Virgo S190814bv: no counterpart candidates in Nickel/Direct imaging and non-detections of 2019nmd and 2019nme
  32. LIGO/Virgo S190814bv: no counterpart candidates in Keck I MOSFIRE imaging
  33. LIGO/Virgo S190814bv: MeerLICHT coverage second preliminary skymap
  34. LIGO/Virgo S190814bv Global MASTER-Net optical observations
  35. LIGO/Virgo S190814bv : No counterpart candidate in TAROT-GRANDMA observations
  36. LIGO/Virgo S190814bv: GRAWITA TNG imaging of selected galaxies
  37. LIGO/Virgo S190814bv: Liverpool Telescope imaging of selected galaxies
  38. LIGO/Virgo S190814bv: Nordic Optical Telescope imaging of selected galaxies
  39. Fermi trigger No 587392154 Global MASTER-Net observations report
  40. FRB 190806: MASTER optical observation
  41. GRB 190726A: Insight-HXMT/HE detection
  42. GRB 190805B: AstroSat CZTI detection
  43. Fermi trigger No 586788607 Global MASTER-Net observations report
  44. GRB 190806A: Fermi GBM Final Real-time Localization
  45. GRB 190805B: MAXI/GSC detection
  46. GRB 190731A: Swift-XRT afterglow detection
  47. LIGO/Virgo S190728q: ZTF Forced Photometry for PS1 and DECam-GROWTH optical candidates, and a note on DECam Photometry from GCN 25215
  48. LIGO/Virgo S190728q: No counterpart candidates in KAIT observations
  49. GRB 190728A: Fermi GBM Final Real-time Localization
  50. LIGO/Virgo S190727h: No counterpart candidates in KAIT observations
  51. Fermi trigger No 585864875 Global MASTER-Net observations report
  52. GRB 190726A: BALROG localization (Fermi Trigger 585847498 / GRB 190726642)
  53. GRB 190726A: Fermi GBM Final Real-time Localization
  54. GRB 190723A: Insight-HXMT/HE detection
  55. Fermi trigger No 585621841 Global MASTER-Net observations report
  56. GRB 190724A: Fermi GBM Final Real-time Localization
  57. GRB 190723A: Fermi GBM Final Real-time Localization
  58. LIGO/Virgo S190720a: No counterpart candidates in KAIT observations
  59. GRB 190719C: Swift-XRT light-curve fit
  60. LIGO/Virgo S190720a : no neutrino counterpart candidate in ANTARES search
  61. LIGO/Virgo S190718y: No counterpart candidates in CNEOST
  62. LIGO/Virgo S190718y: No counterpart candidates in KAIT observations
  63. GRB 190718A: Swift-XRT refined Analysis
  64. GRB 190718A: Swift detection of a burst
  65. Fermi trigger No 584583925 Global MASTER-Net observations report
  66. IPN triangulation of GRB 190706D (short)
  67. LIGO/Virgo S190706ai: No counterpart candidates in KAIT observations
  68. IPN triangulation of GRB 190704A (short)
  69. LIGO/Virgo S190701ah: GRAWITA VST-ESO PARANAL observations
  70. GRB 190706B: Swift-XRT refined Analysis
  71. IceCube Alert 190704.78 Global MASTER-Net observations report
  72. Baksan Neutrino Observatory Alert 190703.21 Global MASTER-Net observations report
  73. Baksan Neutrino Observatory Alert 190703.56 Global MASTER-Net observations report
  74. LIGO/Virgo S190630ag: no counterpart candidate in the SVOM/GWAC observations
  75. LIGO/Virgo S190701ah: KMTNet Observation
  76. Fermi-LAT Gamma-ray Observations of IceCube-190629A
  77. GRB 190701A: Swift-XRT refined Analysis
  78. GRB 190630C: Swift-XRT refined Analysis
  79. LIGO/Virgo S190701ah: Upper limits from IceCube neutrino searches
  80. LIGO/Virgo S190630ag: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  81. GRB 190630B: Swift-XRT refined Analysis
  82. IceCube-190629A - IceCube observation of a high-energy neutrino candidate event
  83. Fermi trigger No 583327924 Global MASTER-Net observations report
  84. Swift GRB190624.86 Global MASTER-Net observations report
  85. Fermi trigger No 582856902 Global MASTER-Net observations report
  86. Fermi trigger No 582615488 Global MASTER-Net observations report
  87. Konus-Wind observation of GRB 190611B
  88. GRB 190613B: Swift-XRT refined Analysis
  89. IPN Triangulation of GRB 190611B
  90. GRB 190613A: Swift-XRT refined Analysis
  91. GRB 190611A: Swift-XRT refined Analysis
  92. GRB 190612A: Fermi GBM Final Real-time Localization
  93. Fermi trigger No 581882394 Global MASTER-Net observations report
  94. Fermi trigger No 581645543 Global MASTER-Net observations report
  95. GRB 190604B: VLT Afterglow Detection
  96. GRB 190604B: Swift-XRT refined Analysis
  97. S190602aq: MASTER OT detection
  98. GRB 190531B: Swift-XRT afterglow detection
  99. GRB 190530A: Swift-XRT afterglow detection
  100. LIGO/Virgo S190425z: No counterpart candidate in Zadko-GRANDMA observations.

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