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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"

28303 results found.

  1. GRB 171210A: Fermi GBM detection
  2. GRB 171209A: Lulin 1m telescope observations
  3. GRB 171209A: Swift-BAT refined analysis
  4. Konus-Wind observation of GRB 171205A
  5. GRB 171205A: iTelescope optical observations
  6. GRB 171205A: Mondy optical observations
  7. GRB 171205A: SAO-RAS optical observations
  8. GRB 171209A: Swift/UVOT Analysis of the burst
  9. GRB 171209A: Swift-XRT refined Analysis
  10. GRB 171209A: Enhanced Swift-XRT position
  11. Swift Trigger 796115 is probably not a GRB
  12. GRB 171205A: UKIRT near-IR observations
  13. GRB 171209A: LCO 1-m telescope observations
  14. GRB 171120A CALET Gamma-Ray Burst Monitor detection
  15. LIGO/Virgo G298048: Brightening X-ray Emission from GW170817/GRB170817A/SSS17a
  16. GRB 171205A: TSHAO optical observations
  17. LIGO/Virgo GW170817: Chandra X-ray brightening of the counterpart 108 days since merger
  18. LIGO/Virgo G298048: Late-time detection of the X-ray afterglow with Chandra
  19. GRB 171205A: GROND observations of the optical/NIR transient
  20. GRB 171205A: LCO 1-m telescope observations
  21. GRB171205A hyperluminal radio afterglow?
  22. GRB 171205A: GMG observations (2nd night)
  23. GRB 171205A: Host galaxy photometric properties
  24. GRB 171205A: CHILESCOPE optical observations
  25. GRB 171205A: SMARTS optical/IR afterglow observations
  26. GRB 171205A: GOTO detection of the optical counterpart
  27. GRB 171205A: TNG NIR detections
  28. GRB 171205A: LSGT optical afterglow follow-up observation
  29. GRB 171205A: GMG observation
  30. GRB 171205A: Swift-BAT refined analysis
  31. GRB 171205A: Swift-XRT refined Analysis
  32. GRB 171205A: RATIR Optical and NIR Observations
  33. GRB 171205A: Swift/UVOT Detection
  34. GRB 171205A: VLT/X-shooter optical counterpart and spectroscopic observations
  35. GRB 171205A: Enhanced Swift-XRT position
  36. GRB 171205A: Swift detection of a burst
  37. GRB 171124A: TShAO optical observations
  38. GRB 171124A: Swift-XRT afterglow detection
  39. Pan-STARRS follow-up of IceCube-171106A
  40. LIGO/Virgo G299232: LOFAR follow-up
  41. GRB 171124A: Insight-HXMT/HE detection
  42. GRB 171126A: Fermi GBM detection
  43. GRB 171123A: TShAO optical upper limit
  44. GRB 171123A: OSN Upper Limit
  45. GRB 171124A: Swift-XRT observations
  46. GRB 171124A: Fermi GBM observation
  47. GRB 171123A: Tautenburg observations
  48. GRB 171123A: Nanshan-1m optical upper limit
  49. GRB 171123A: RATIR Optical and NIR Observations
  50. GRB 171123A: Swift/UVOT Upper Limits
  51. GRB 171123A: GMG observation limit
  52. GRB 171123A: Swift-BAT refined analysis
  53. GRB 171123A: Swift-XRT refined Analysis
  54. GRB 171123A: Confirmation of the X-ray afterglow
  55. GRB 171123A: Enhanced Swift-XRT position
  56. GRB 171123A: Swift detection of a burst
  57. GRB 171120A: Xinglong-2.16m optical upper limit
  58. GRB 171120A: Swift/UVOT Upper Limits
  59. GRB 171120A: Swift-BAT refined analysis
  60. GRB 171120A: Fermi GBM Detection
  61. GRB 171120A: Swift-XRT refined Analysis
  62. GRB 171120A: Enhanced Swift-XRT position
  63. GRB 171120A: Swift detection of a burst
  64. Fermi-LAT Gamma-ray Observations of IceCube-171106A
  65. GRB 171115A: RATIR Optical and NIR Observations
  66. GRB 171115A: Swift-BAT refined analysis
  67. GRB 171115A: Swift-XRT refined Analysis
  68. GRB 171115A: Enhanced Swift-XRT position
  69. GRB 171115A: Swift detection of a burst
  70. GRB 171112A: Fermi GBM Detection
  71. GRB 171112A: MAXI/GSC detection
  72. IPN Triangulation of GRB 171108A (short)
  73. IceCube-171106A: Swift Observations
  74. HAWC follow-up of IceCube-171106A
  75. GRB 171010A: afterglow and SN 2017htp optical observations
  76. GRB 171108A: Fermi GBM detection
  77. GRB 171101A CALET Gamma-Ray Burst Monitor detection
  78. INTEGRAL observation of IceCube-171106A
  79. GRB 171010A: possible SN component
  80. IceCube-171106A - IceCube observation of a high-energy neutrino candidate
  81. GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
  82. GRB 171103A: Swift-BAT refined analysis of a short GRB
  83. GRB 171103A: Swift detection of a short hard burst
  84. Konus-Wind observation of GRB 171102A
  85. GRB 171102B: AbAO optical upper limit
  86. GRB 171102B: TShAO optical upper limit
  87. IPN Triangulation of GRB 171102A
  88. GRB 171102B: Nanshan 0.36m and 0.60m optical upper limits
  89. GRB 171102B: RATIR Optical and NIR Observations
  90. GRB 171102B: Swift-BAT refined analysis
  91. GRB 171102B: Swift/UVOT Upper Limits
  92. GRB 171102B: Swift-XRT refined Analysis
  93. GRB 171102B: Enhanced Swift-XRT position
  94. GRB 171102A: Fermi GBM detection
  95. GRB 171102B: Swift detection of a burst
  96. GRB 171030A: Swift non-localization with BAT, XRT and UVOT
  97. IPN Triangulation of GRB 171030A (short)
  98. Swift Trigger 783893: KAIT Optical Observations
  99. Swift Triggers 784159 and 784160 are not bursts
  100. Konus-Wind observation of GRB 171027A

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