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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"

5183 results found.

  1. GRB 190829A: Swift-XRT refined Analysis
  2. LIGO/Virgo S190828j: No Counterparts in DDOTI/OAN Optical Observations
  3. LIGO/Virgo S190828l: No counterpart candidates in KAIT observations
  4. Fermi trigger No 588801358 Global MASTER-Net observations report
  5. LIGO/Virgo S190426c: Update on Probability of Terrestrial Origin
  6. GRB 190828B: Swift-XRT refined Analysis
  7. LIGO/Virgo S190828j: No counterpart candidates in KAIT observations
  8. LIGO/Virgo S190814bv: CFHTphotometryof AT2019npv
  9. LIGO/Virgo S190814bv: Radio non-detection of DG19wxnjc/AT2019npv with the VLA
  10. LIGO/Virgo S190814bv: LCO Photometry of DG19wxnjc/AT2019npv
  11. GRB 190824A: Swift-XRT refined Analysis
  12. GRB 190824A: Fermi GBM observation
  13. Fermi trigger No 588350802 Global MASTER-Net observations report
  14. GRB 190824A: Fermi GBM Final Real-time Localization
  15. LIGO/Virgo S190814bv: Keck NIRES spectroscopy of DG19wxnjc/AT2019npv
  16. Fermi trigger No 588185734 Global MASTER-Net observations report
  17. Fermi GBM-190816: MASTER-Net optical observation report
  18. LIGO/Virgo S190814bv: No radio counterpart detected in ASKAP observations
  19. GRB 190821A: Swift-XRT refined Analysis
  20. LIGO/Virgo S190814bv: No Optical Counterpart Candidates in Second-Epoch Lick/KAIT Observations
  21. LIGO/Virgo S190814bv: Further Pan-STARRS observations and transient sources
  22. IceCube-190819A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  23. LIGO/Virgo S190814bv: Keck/MOSFIRE NIR spectroscopy of DG19njmjc (= AT 2019nra)
  24. LIGO/Virgo S190814bv: Prioritization of Counterpart Candidates based on a Photometric Redshift Analysis by the DECam-GROWTH Team
  25. LIGO/Virgo S190814bv: GRAWITA TNG infrared imaging of desgw-190814e, DG19sevhc and selected galaxies
  26. LIGO/Virgo S190814bv : No Counterpart Candidates in Continued Galaxy Targeted Search with Magellan
  27. LIGO/Virgo S190814bv: no candidates from optical imaging of selected galaxies at the NOT
  28. LIGO/Virgo S190814bv: GROND imaging of candidate galaxies
  29. GRB 190816A: Swift detection of a burst
  30. LIGO/Virgo S190814bv : No Counterpart Candidates in Galaxy Targeted Search with Magellan
  31. LIGO/Virgo S190814bv: GRAWITA TNG infrared imaging of selected galaxies
  32. LIGO/VIRGO S190814bv: No candidates from Pan-STARRS and non-detection of AT2019nme
  33. LIGO/Virgo S190814bv: No counterpart candidates in KAIT observations
  34. LIGO/Virgo S190814bv: no counterpart candidates in Thacher imaging
  35. LIGO/Virgo S190814bv: no counterpart candidates in Swope imaging
  36. LIGO/Virgo S190814bv: no counterpart candidates in Nickel/Direct imaging and non-detections of 2019nmd and 2019nme
  37. LIGO/Virgo S190814bv: no counterpart candidates in Keck I MOSFIRE imaging
  38. LIGO/Virgo S190814bv: MeerLICHT coverage second preliminary skymap
  39. LIGO/Virgo S190814bv Global MASTER-Net optical observations
  40. LIGO/Virgo S190814bv : No counterpart candidate in TAROT-GRANDMA observations
  41. LIGO/Virgo S190814bv: GRAWITA TNG imaging of selected galaxies
  42. LIGO/Virgo S190814bv: Liverpool Telescope imaging of selected galaxies
  43. LIGO/Virgo S190814bv: Nordic Optical Telescope imaging of selected galaxies
  44. Fermi trigger No 587392154 Global MASTER-Net observations report
  45. FRB 190806: MASTER optical observation
  46. GRB 190726A: Insight-HXMT/HE detection
  47. GRB 190805B: AstroSat CZTI detection
  48. Fermi trigger No 586788607 Global MASTER-Net observations report
  49. GRB 190806A: Fermi GBM Final Real-time Localization
  50. GRB 190805B: MAXI/GSC detection
  51. GRB 190731A: Swift-XRT afterglow detection
  52. LIGO/Virgo S190728q: ZTF Forced Photometry for PS1 and DECam-GROWTH optical candidates, and a note on DECam Photometry from GCN 25215
  53. LIGO/Virgo S190728q: No counterpart candidates in KAIT observations
  54. GRB 190728A: Fermi GBM Final Real-time Localization
  55. LIGO/Virgo S190727h: No counterpart candidates in KAIT observations
  56. Fermi trigger No 585864875 Global MASTER-Net observations report
  57. GRB 190726A: BALROG localization (Fermi Trigger 585847498 / GRB 190726642)
  58. GRB 190726A: Fermi GBM Final Real-time Localization
  59. GRB 190723A: Insight-HXMT/HE detection
  60. Fermi trigger No 585621841 Global MASTER-Net observations report
  61. GRB 190724A: Fermi GBM Final Real-time Localization
  62. GRB 190723A: Fermi GBM Final Real-time Localization
  63. LIGO/Virgo S190720a: No counterpart candidates in KAIT observations
  64. GRB 190719C: Swift-XRT light-curve fit
  65. LIGO/Virgo S190720a : no neutrino counterpart candidate in ANTARES search
  66. LIGO/Virgo S190718y: No counterpart candidates in CNEOST
  67. LIGO/Virgo S190718y: No counterpart candidates in KAIT observations
  68. GRB 190718A: Swift-XRT refined Analysis
  69. GRB 190718A: Swift detection of a burst
  70. Fermi trigger No 584583925 Global MASTER-Net observations report
  71. IPN triangulation of GRB 190706D (short)
  72. LIGO/Virgo S190706ai: No counterpart candidates in KAIT observations
  73. IPN triangulation of GRB 190704A (short)
  74. LIGO/Virgo S190701ah: GRAWITA VST-ESO PARANAL observations
  75. GRB 190706B: Swift-XRT refined Analysis
  76. IceCube Alert 190704.78 Global MASTER-Net observations report
  77. Baksan Neutrino Observatory Alert 190703.21 Global MASTER-Net observations report
  78. Baksan Neutrino Observatory Alert 190703.56 Global MASTER-Net observations report
  79. LIGO/Virgo S190630ag: no counterpart candidate in the SVOM/GWAC observations
  80. LIGO/Virgo S190701ah: KMTNet Observation
  81. Fermi-LAT Gamma-ray Observations of IceCube-190629A
  82. GRB 190701A: Swift-XRT refined Analysis
  83. GRB 190630C: Swift-XRT refined Analysis
  84. LIGO/Virgo S190701ah: Upper limits from IceCube neutrino searches
  85. LIGO/Virgo S190630ag: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  86. GRB 190630B: Swift-XRT refined Analysis
  87. IceCube-190629A - IceCube observation of a high-energy neutrino candidate event
  88. Fermi trigger No 583327924 Global MASTER-Net observations report
  89. Swift GRB190624.86 Global MASTER-Net observations report
  90. Fermi trigger No 582856902 Global MASTER-Net observations report
  91. Fermi trigger No 582615488 Global MASTER-Net observations report
  92. Konus-Wind observation of GRB 190611B
  93. GRB 190613B: Swift-XRT refined Analysis
  94. IPN Triangulation of GRB 190611B
  95. GRB 190613A: Swift-XRT refined Analysis
  96. GRB 190611A: Swift-XRT refined Analysis
  97. GRB 190612A: Fermi GBM Final Real-time Localization
  98. Fermi trigger No 581882394 Global MASTER-Net observations report
  99. Fermi trigger No 581645543 Global MASTER-Net observations report
  100. GRB 190604B: VLT Afterglow Detection

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