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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"

15408 results found.

  1. LIGO/Virgo S190701ah: No transient candidates from CALET observations
  2. LIGO/Virgo S190701ah: Upper limits from Insight-HXMT/HE observations
  3. Fermi-LAT Gamma-ray Observations of IceCube-190629A
  4. LIGO/Virgo S190701ah: No counterpart candidates in the Swift/BAT Observations
  5. LIGO/Virgo S190701ah: Upper limits from AGILE-GRID observations
  6. LIGO/Virgo S190630ag: Upper limits from Insight-HXMT/HE observations
  7. LIGO/Virgo S190701ah: Upper limits from Fermi-GBM Observations
  8. LIGO/Virgo S190630ag: Upper limits from CALET observations
  9. LIGO/Virgo S190701ah: Coverage and upper limits from MAXI/GSC observations
  10. GRB190701A: No candidates/counterpart in optical follow-up from GROWTH-India Telescope
  11. LIGO/Virgo S190701ah: No counterpart candidates in AGILE-MCAL observations
  12. LIGO/Virgo S190701ah: No neutrino counterpart candidates in ANTARES search
  13. LIGO/Virgo S190701ah: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  14. LIGO/Virgo S190630ag: No counterpart candidates in AGILE-GRID observations
  15. GRB 190630C: AstroSat CZTI detection
  16. LIGO/Virgo S190630ag: No counterpart candidates in the Swift/BAT Observations
  17. GRB 190701B: a long GRB detected by IBAS
  18. LIGO/Virgo S190630ag: No counterpart candidates in AGILE-MCAL observations
  19. LIGO/Virgo S190630ag: No counterpart candidates in Fermi-LAT observations
  20. GRB 190630B: KAIT Optical Afterglow Confirmation
  21. LIGO/Virgo S190630ag: Upper limits from Fermi-GBM Observations
  22. LIGO/Virgo S190630ag: Coverage and upper limits from MAXI/GSC observations
  23. LIGO/Virgo S190630ag: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  24. LIGO/Virgo S190630ag: No neutrino counterpart candidates in ANTARES search
  25. LIGO/Virgo S190630ag: No counterpart candidates in HAWC observations
  26. GRB 190630B, Swift-BAT refined analysis
  27. IceCube-190629A: Upper limits from Fermi-GBM Observations
  28. Swift Trigger 912102: possible GRB 190630B
  29. IceCube-190629A - IceCube observation of a high-energy neutrino candidate event
  30. GRB 190627A: Swift-BAT refined analysis (short-soft burst)
  31. GRB190627A: VIRT Afterglow observation
  32. GRB 190619B: AstroSat CZTI detection
  33. IceCube-190619A: prompt emission upper limits from AstroSat-CZTI
  34. GRB 190615B: AstroSat CZTI detection
  35. Fermi-LAT Gamma-ray Observations of IceCube-190619A
  36. IceCube-190619A: No counterpart candidates in ANTARES data
  37. IceCube-190619A - HAWC follow-up
  38. IceCube-190619A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  39. IceCube-190619A - IceCube observation of a high-energy neutrino candidate event
  40. GRB 190613A: SEDM Observations
  41. GRB 190613B: AstroSat CZTI detection
  42. GRB 190611B: AstroSat CZTI detection
  43. Konus-Wind observation of GRB 190613B
  44. GRB 190615B: Insight-HXMT/HE detection
  45. GRB 190615A: Insight-HXMT/HE detection
  46. GRB 190613B: SEDM Observations
  47. GRB 190613A: SEDM Observations
  48. GRB 190613B: GROND Detection of the Optical/NIR Afterglow
  49. GRB 190613B: Insight-HXMT/HE detection
  50. Konus-Wind observation of short/hard GRB 190610A
  51. Konus-Wind observation of GRB 190611B
  52. GRB 190613B: BOOTES-5/JGT early optical observations
  53. GRB 190613A: FRAM-ORM afterglow detection
  54. GRB 190610A: Swift ToO observations
  55. GRB 190613B: KAIT Optical Afterglow Confirmation
  56. GRB 190613A: Fermi GBM detection
  57. GRB 190613B: Fermi GBM observation
  58. GRB 190609A: AstroSat CZTI detection
  59. GRB 190613A: KAIT Optical Afterglow Confirmation
  60. GRB 190610B: AstroSat CZTI detection
  61. Konus-Wind observation of GRB 190606A
  62. GRB 190610A: Insight-HXMT/HE detection
  63. GRB 190605A: AstroSat CZTI detection
  64. GRB 190606A: Insight-HXMT/HE detection
  65. LIGO/Virgo S190425z: Swift UVOT - no new sources identified, and a summary of the Swift UVOT processing of GW triggers.
  66. IPN Triangulation of GRB 190606A (short)
  67. GRB 190606A: Fermi-LAT detection
  68. GRB 190605B: Insight-HXMT/HE detection
  69. Fermi trigger No 581478912 / GRB 190606A: AGILE/MCAL observations
  70. GRB 190604A: Insight-HXMT/HE detection
  71. GRB 190604A: AstroSat CZTI detection
  72. GRB 190530A: optical follow-up observations at Konkoly
  73. GRB190604B: GROWTH-India telescope followup - no optical counterpart found
  74. GRB190530A: Photometric follow-up with GROWTH-India telescope
  75. LIGO/Virgo S190521r: Gaia Photometric Alerts transient candidate
  76. LIGO/Virgo S190602aq: AstroSat CZTI upper limits
  77. LIGO/Virgo S190602aq: Upper limits from CALET observations
  78. LIGO/Virgo S190602aq: Upper limits from Insight-HXMT/HE observations
  79. Konus-Wind observation of GRB 190531B
  80. LIGO/Virgo S190602aq: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  81. LIGO/Virgo S190602aq: upper limit in INTEGRAL SPI-ACS prompt observations
  82. LIGO/Virgo S190602aq: No counterpart candidates in Fermi-LAT observations
  83. LIGO/Virgo S190602aq: No counterpart candidates in the Swift/BAT Observations
  84. LIGO/Virgo S190602aq: Upper limits from Fermi-GBM Observations
  85. LIGO/Virgo S190602aq: Upper limits from AGILE-GRID observations
  86. LIGO/Virgo S190602aq: No counterpart candidate in AGILE-MCAL observations
  87. LIGO/Virgo S190602aq: Coverage and upper limits from MAXI/GSC observations
  88. LIGO/Virgo S190602aq: No neutrino counterpart candidates in ANTARES search
  89. LIGO/Virgo S190602aq: No counterpart candidates in HAWC observations
  90. Konus-Wind observation of extremely bright GRB 190530A
  91. GRB 190530A: Insight-HXMT/HE detection
  92. GRB 190531B: Insight-HXMT/HE detection
  93. GRB 190530A: Konkoly optical observations of the afterglow
  94. GRB 190530A: Swift/UVOT Detection
  95. GRB 190531B: Swift ToO observations
  96. GRB 190531B: Fermi-LAT detection
  97. GRB 190530A: Steep afterglow decay found by OSN
  98. GRB 190530A: AstroSat CZTI detection
  99. GRB 190530A: Swift-XRT afterglow detection
  100. GRB 190530A: GWAC-F30 optical detection

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