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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

11105 results found.

  1. GRB 190829A: No Neutrino Counterpart detected with ANTARES
  2. GRB 190829A, Swift-BAT refined analysis
  3. GRB 190829A: AGILE-GRID upper limits
  4. GRB 190829A: AGILE ratemeters detection and MCAL upper limits
  5. GRB 190829A: Fermi GBM detection
  6. GRB 190829A: Fermi-LAT Upper Limits
  7. GRB 190829A:: Global MASTER-net optical clear and polarization observations scheduler and some spiculations
  8. Fermi trigger No 588838851 Global MASTER-Net observations report
  9. GRB 190829A: 10.4m GTC spectroscopy
  10. GRB 190830B: Fermi GBM Final Real-time Localization
  11. GRB 190830A: Fermi GBM Final Real-time Localization
  12. GRB 190829A: GROWTH India detection of afterglow
  13. Fermi trigger No 588801358 Global MASTER-Net observations report
  14. GRB 190829A: Swift detection of a burst consistent with a galaxy at z=0.08
  15. GRB 190829A: Fermi GBM Final Real-time Localization
  16. GRB 190828B: VLT/X-shooter optical afterglow candidate
  17. LIGO/Virgo S190828l: No counterpart candidates in Fermi-LAT observations
  18. GRB 190828B: Fermi GBM observation
  19. LIGO/Virgo S190828j: No counterpart candidates in Fermi-LAT observations
  20. LIGO/Virgo S190828l: Upper limits from Fermi-GBM Observations
  21. LIGO/Virgo S190828j: Upper limits from Fermi-GBM Observations
  22. GRB 190828C: BALROG localization (Fermi Trigger 588696271 / GRB 190828614)
  23. GRB 190828C: Fermi GBM Final Real-time Localization
  24. GRB 190828B: Fermi GBM Final Real-time Localization
  25. LIGO/Virgo S190814bv: DESGW non-detection of AT2019osy/ASKAP 005547-270433
  26. Fermi trigger No 588597173 Global MASTER-Net observations report
  27. Fermi GBM-190816: Eight additional candidates from the Zwicky Transient Facility
  28. GRB 190827A: BALROG localization (Fermi Trigger 588597173 / GRB 190827467)
  29. GRB 190827A: Fermi GBM Final Real-time Localization
  30. LIGO/Virgo S190814bv: Final list of candidates from the DESGW coadd analysis from the week long search campaign
  31. Fermi trigger No 588398821 Global MASTER-Net observations report
  32. GRB 190825A: Fermi GBM Final Real-time Localization
  33. GRB 190824A: Fermi GBM observation
  34. Fermi trigger No 588350802 Global MASTER-Net observations report
  35. Fermi GBM-190816: Updated localization of subthreshold GRB-GW candidate
  36. GRB 190824A: Fermi GBM Final Real-time Localization
  37. Fermi trigger No 588185734 Global MASTER-Net observations report
  38. Fermi GBM-190816: Coverage and upper limits from MAXI/GSC observations
  39. Fermi trigger No 588115134 Global MASTER-Net observations report
  40. Fermi GBM-190816: MASTER-Net optical observation report
  41. LIGO/Virgo S190814bv: new candidate from DESGW
  42. GRB 190821A: Fermi GBM observation
  43. Fermi GBM-190816: Upper Limits from Swift/BAT Observations
  44. Fermi GBM-190816: Correction from the Zwicky Transient Facility
  45. Fermi GBM-190816: Four additional candidates from the Zwicky Transient Facility
  46. Fermi trigger No 588100239 Global MASTER-Net observations report
  47. Fermi GBM-190816: No counterpart candidates in Fermi-LAT observations
  48. LIGO/Virgo S190814bv: further candidates from DESGW
  49. Fermi GBM-190816: AGILE in SAA at T0
  50. Fermi GBM-190816: ZTF19abqanpy 10.4m GTC spectroscopy
  51. Fermi-LAT Gamma-ray Observations of IceCube-190819A
  52. Fermi GBM-190816: One candidate counterpart from the Zwicky Transient Facility
  53. LIGO/Virgo GBM-190816: no counterpart candidates in the Swift/BAT Observations
  54. Fermi GBM-190816: Upper limits from IceCube neutrino searches
  55. IceCube-190819A: MASTER analysis
  56. Fermi GBM-190816: No counterpart candidates in HAWC observations
  57. Fermi GBM-190816+LIGO/Virgo : no neutrino counterpart candidate in ANTARES search
  58. Fermi GBM-190816: Location-dependent upper limits from INTEGRAL/SPI-ACS prompt observation
  59. Fermi GBM-190816: A subthreshold GRB candidate potentially associated with a subthreshold LIGO/Virgo compact binary merger candidate
  60. IceCube-190819A: Upper limits from Fermi-GBM Observations
  61. IceCube-190819A - IceCube observation of a high-energy neutrino candidate event
  62. LIGO/Virgo S190814bv: DESGW candidate update
  63. Fermi trigger No 587775150 Global MASTER-Net observations report
  64. GRB 190817A: Fermi GBM Final Real-time Localization
  65. LIGO/Virgo S190814bv: Fermi-LAT search for a high-energy gamma-ray counterpart
  66. LIGO/Virgo S190814bv: New candidates from DECam DESGW difference imaging search
  67. GRB 190813A: Insight-HXMT/HE detection
  68. GRB 190814A: Insight-HXMT/HE detection
  69. LIGO/Virgo S190814bv: No candidates identified in DECam data by visual inspection
  70. Fermi trigger No 587505927 Global MASTER-Net observations report
  71. LIGO/Virgo S190814bv: Candidates found in initial DESGW search
  72. IPN triangulation of GRB 190813A (short)
  73. LIGO/Virgo S190814bv: Upper limits from Fermi-GBM Observations
  74. GRB 190814A: Fermi GBM Final Real-time Localization
  75. Fermi trigger No 587392154 Global MASTER-Net observations report
  76. GRB 190813A: Fermi GBM Final Real-time Localization
  77. IPN triangulation of GRB 190805B
  78. IPN triangulation of GRB 190810A (short)
  79. Fermi trigger No 587084236 Global MASTER-Net observations report
  80. GRB 190810A: Fermi GBM Final Real-time Localization
  81. HAWC-190806A: Upper limits from Fermi-GBM Observations
  82. GRB 190726A: Insight-HXMT/HE detection
  83. LIGO/Virgo S190728q: New optical candidates from the DESGW program
  84. GRB 190808B: BALROG localization (Fermi Trigger 586980202 / GRB 190808752)
  85. Fermi trigger No 586980202 Global MASTER-Net observations report
  86. GRB 190808B: Fermi GBM Final Real-time Localization
  87. GRB 190808A: Fermi GBM Final Real-time Localization
  88. GRB 190804A: AstroSat CZTI detection
  89. Fermi trigger No 586896678 Global MASTER-Net observations report
  90. GRB 190805B: AstroSat CZTI detection
  91. Konus-Wind observation of GRB 190805B
  92. Fermi trigger No 586788607 Global MASTER-Net observations report
  93. Fermi trigger No 586800758 Global MASTER-Net observations report
  94. GRB 190806A: Fermi GBM Final Real-time Localization
  95. Fermi trigger No 586676451 Global MASTER-Net observations report
  96. GRB 190805B: Fermi GBM detection
  97. Konus-Wind observation of GRB 190731A
  98. GRB 190805B: BALROG localization (Fermi Trigger 586673165 / GRB 190805199)
  99. GRB 190805B: MAXI/GSC detection
  100. GRB 190805B: Fermi GBM Final Real-time Localization

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