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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

36176 results found.

  1. GRB 190628B - AstroSat CZTI detection
  2. LIGO/Virgo S190701ah: Upper limits from Insight-HXMT/HE observations
  3. Fermi Gamma-ray Burst Monitor trigger 190626526/583245413 is not a GRB
  4. LIGO/Virgo S190701ah: No counterpart candidates in the Swift/BAT Observations
  5. IPN triangulation of GRB 190630A (short)
  6. LIGO/Virgo S190630ag: Upper limits from Insight-HXMT/HE observations
  7. LIGO/Virgo S190701ah: Upper limits from Fermi-GBM Observations
  8. GRB 190701A: Swift-XRT refined Analysis
  9. GRB 190630C: Swift-XRT refined Analysis
  10. GRB 190701A: Swift/UVOT Upper Limits
  11. LIGO/Virgo S190701ah: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  12. GRB 190630B: Tien Shan and Koshka Zeiss-1000 optical upper limits
  13. GRB 190630C: ISON-Castelgrande optical upper limit
  14. GRB 190701A: COATLI Optical Observations
  15. GRB 190630C: Swift/UVOT Upper Limits
  16. GRB 190630C: KAIT Optical Upper Limit
  17. GRB 190630B: Swift/UVOT Upper Limits
  18. GRB 190630C: Swift-BAT refined analysis
  19. GRB 190701A: Enhanced Swift-XRT position
  20. GRB 190630C: AstroSat CZTI detection
  21. LIGO/Virgo S190630ag: No counterpart candidates in the Swift/BAT Observations
  22. GRB 190701A: MAXI/GSC detection
  23. GRB 190701B: a long GRB detected by IBAS
  24. GRB 190701A: Prompt enhanced Swift-XRT position
  25. GRB 190701A: Swift detection of a burst
  26. GRB 190630B: KAIT Optical Afterglow Confirmation
  27. GRB 190630C: Enhanced Swift-XRT position
  28. LIGO/Virgo S190630ag: Upper limits from Fermi-GBM Observations
  29. GRB 190630C: Swift detection of a burst
  30. LIGO/Virgo S190630ag: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  31. GRB 190630B: Swift-XRT refined Analysis
  32. GRB 190630B, Swift-BAT refined analysis
  33. IceCube-190629A: Upper limits from Fermi-GBM Observations
  34. GRB 190627A: VLT/FORS2 spectroscopic redshift
  35. GRB Swift Trigger 912102: KAIT Optical Afterglow Candidate
  36. Swift Trigger 912102: possible GRB 190630B
  37. GRB 190630A: Fermi GBM Final Real-time Localization
  38. GRB 190627A: Koshka Zeiss-1000 optical counterpart observations
  39. GRB 190627A : Xinglong 2.16m optical observation
  40. GRB 190627A: Swift-XRT refined Analysis
  41. GRB 190627A: GMG observation at the second epoch
  42. GRB 190627A: NOT optical observations
  43. GRB 190627A: Optical imaging by D50 from Ondrejov
  44. GRB 190627A: NIR imaging from Liverpool Telescope
  45. GRB 190627A: Optical imaging and spectroscopy from Calar Alto
  46. GRB 190627A: NUTTelA-TAO optical counterpart observations
  47. GRB 190627A: Swift-BAT refined analysis (short-soft burst)
  48. GRB 190610A: Further Swift-XRT observations
  49. GRB 190628A: Fermi GBM Final Real-time Localization
  50. GRB 190627A: GMG observation
  51. GRB 190627A: MASTER optical counterpart observation
  52. GRB190627A: VIRT Afterglow observation
  53. GRB 190627A: Montarrenti Observatory optical detection
  54. GRB 190627A: NUTTelA-TAO optical observations
  55. GRB 190627A: Enhanced Swift-XRT position
  56. GRB 190627A: Swift/UVOT Detection
  57. GRB 190627A: Swift detection of a burst
  58. GRB 190626B: Fermi GBM Final Real-time Localization
  59. GRB 190619B: AstroSat CZTI detection
  60. GRB 190626A: Fermi GBM Final Real-time Localization
  61. Swift Trigger 911102: a possible GRB
  62. GRB 190623A: Fermi GBM Final Real-time Localization
  63. GRB 190622A: BALROG localization (Fermi Trigger 582886211 / GRB 190622368)
  64. GRB 190622A: Fermi GBM Final Real-time Localization
  65. GRB 190615B: AstroSat CZTI detection
  66. GRB 190620A: BALROG localization (Fermi Trigger 582725415 / GRB 190620507)
  67. GRB 190620A: Fermi GBM Final Real-time Localization
  68. IceCube-190619A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  69. Fermi GBM trigger 190619235/582615488 likely not a GRB
  70. GRB 190619B: BALROG localization (Fermi Trigger 582646590 / GRB 190619595)
  71. GRB 190619B: Fermi GBM Final Real-time Localization
  72. GRB 190613A: SEDM Observations
  73. GRB 190613B: JCMT SCUBA-2 sub-mm observations
  74. GRB 190619A: Fermi GBM Final Real-time Localization
  75. GRB 190613B: AstroSat CZTI detection
  76. GRB 190611B: AstroSat CZTI detection
  77. Konus-Wind observation of GRB 190613B
  78. GRB 190615B: Insight-HXMT/HE detection
  79. GRB 190615A: Insight-HXMT/HE detection
  80. GRB 190613B: Kitab observatory optical upper limit
  81. GRB 190615A: Fermi GBM Final Real-time Localization
  82. GRB 190613A: Kitab and AbAO optical upper limit
  83. GRB 190613B: SEDM Observations
  84. GRB 190613A: SEDM Observations
  85. GRB 190610A: Swift/UVOT Upper Limits
  86. GRB 190610A: Swift-XRT observations
  87. GRB 190613B: Optical observation from Asiago Schmidt
  88. GRB 190613B: GROND Detection of the Optical/NIR Afterglow
  89. GRB 190611B: CALET Gamma-Ray Burst Monitor detection
  90. GRB 190613B: Insight-HXMT/HE detection
  91. Konus-Wind observation of short/hard GRB 190610A
  92. Konus-Wind observation of GRB 190611B
  93. GRB 190613B: BOOTES-5/JGT early optical observations
  94. GRB 190613B: Optical observations from NOT
  95. GRB 190613B: Swift-XRT refined Analysis
  96. GRB 190613A: FRAM-ORM afterglow detection
  97. GRB 190610A: Swift ToO observations
  98. GRB 190613B: Swift-BAT refined analysis
  99. GRB 190613A, Swift-BAT refined analysis
  100. GRB 190613B: KAIT Optical Afterglow Confirmation

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