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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"

36115 results found.

  1. GRB 190106A: Swift-BAT refined analysis
  2. GRB 190106A: Bassano Bresciano Observatory optical detection
  3. GRB 190106A: Xinglong-2.16m spectroscopy
  4. GRB 190106A: GWAC-F60B optical detection
  5. GRB 190106A : TSHAO optical observations
  6. GRB 190106A: Enhanced Swift-XRT position
  7. GRB 190106A: GMG detection
  8. GRB 190106A: MITSuME Akeno optical observation
  9. GRB 190106A: MASTER Amur OT detection
  10. GRB 190106A: Swift detection of a burst with an optical counterpart
  11. Konus-Wind observation of GRB 190103B
  12. GRB 190103A: AstroSat CZTI detection
  13. GRB 190103B: Bassano Bresciano observatory upper limit
  14. GRB 190103B: Swift-BAT refined analysis
  15. GRB 190103B: Swift-XRT refined Analysis
  16. GRB 190103B: Enhanced Swift-XRT position
  17. GRB 190103B: Swift detection of a burst
  18. GRB 181201A: photometric signature of the SN
  19. GRB 190103A: AGILE/MCAL detection of a burst
  20. GRB 181231A: BOOTES-2/TELMA optical observations
  21. GRB 181231A: Fermi GBM detection
  22. GRB 181231A: Fermi-LAT detection
  23. GRB 181228A: Mondy and AbAO optical upper limits
  24. GRB 181225A: further Swift-XRT observations
  25. GRB 181228A: Global MASTER Net OT is the same REM IR transient
  26. GRB 181228A: possible NOT optical detection
  27. Fermi GBM trigger 567868083/181230547 is not a GRB
  28. GRB 181227A: CALET Gamma-Ray Burst Monitor detection
  29. GRB 181228A: MITSuME Akeno optical upper limits
  30. Konus-Wind observation of GRB 181227A
  31. GRB 181228A: Xinglong-2.16m optical upper limit
  32. GRB 181227A: Global MASTER Net oprtical inspection
  33. Swift Trigger 880127 is not a GRB
  34. GRB 181228A: Swift-XRT refined Analysis
  35. GRB 181228A: Swift-BAT refined analysis
  36. GRB 181222B: Swift follow-up observations of MASTER optical transient J204928.79+245744.0
  37. GRB 181228A: Swift/UVOT Upper Limits
  38. GRB 181228A: TSHAO optical upper limit
  39. GRB 181228A: Fermi GBM observation
  40. IPN Triangulation of GRB 181227A (long)
  41. GRB 181228A: Global MASTER Net OT detection
  42. GRB 181228A: REM NIR detection
  43. GRB 181228A: Enhanced Swift-XRT position
  44. GRB 181225A: CALET Gamma-Ray Burst Monitor detection
  45. GRB 181225A: KAIT Follow-Up Observations with Upper Limit
  46. GRB 181228A: KAIT Optical Upper Limit
  47. GRB 181228A: Swift detection of a burst
  48. GRB 181227A: Fermi GBM detection
  49. GRB 181222B: Swift ToO observations
  50. GRB 181225A: Insight-HXMT/HE detection
  51. GRB 181222A: AstroSat CZTI detection
  52. GRB 181225A: Swift observations and X-ray candidate afterglow
  53. GRB 181225A: Global MASTER Net optical observations
  54. GRB 181225A: Swift ToO observations
  55. GRB 181225A: Fermi GBM detection
  56. GRB 181225A: Fermi-LAT Detection
  57. GRB 181225A: AGILE/MCAL detection of a burst
  58. Konus-Wind observation of GRB 181222A
  59. GRB 181222B: Global MASTER Net observations of short bright Fermi GRB
  60. Konus-Wind observation of GRB 181222B
  61. IPN Triangulation of extremely bright short GRB 181222B
  62. GRB 181224A: Swift-BAT refined analysis
  63. GRB 181224A: Swift detection of a burst
  64. GRB 181222A: CALET Gamma-Ray Burst Monitor detection
  65. GRB 181222B: Global MASTER Net observations of the short bright Fermi GRB error box.
  66. GRB 181222B : Fermi GBM detection
  67. GRB 181222A: Fermi GBM observation
  68. GRB 181222A: MAXI/GSC detection
  69. GRB 181217A: Insight-HXMT/HE detection
  70. GRB 181213A: Swift/UVOT Observations
  71. GRB 181213A: Mondy optical observations
  72. GRB 181213A: continued TSHAO optical observations
  73. GRB 181213A:Insight-HXMT/HE detection
  74. GRB 181212A:Insight-HXMT/HE detection
  75. Konus-Wind observation of GRB 181212A
  76. GRB 181213A: AbAO optical observations
  77. GRB 181213A: HMM-0.5m, NEXT-0.6m, CNEOST-1m optical observations
  78. GRB 181213A: NOT optical observations
  79. GRB 181213A: Swift-XRT refined Analysis
  80. GRB 181213A: Enhanced Swift-XRT position
  81. IPN Triangulation of GRB 181212A (long)
  82. GRB 181213A: Swift-BAT refined analysis
  83. GRB 181213A: GWAC-F60A upper limit
  84. GRB 181126A: MeerKAT radio observation
  85. GRB 181213A : TSHAO optical observations
  86. GRB181213A: Swift/UVOT Detection
  87. GRB 181213A: Swift-XRT observations
  88. GRB 181213A: BOOTES-5/JGT optical observations
  89. GRB 181213A: Swift detection of a burst
  90. GRB 181212A: Fermi GBM Detection
  91. GRB 181126B: KAIT Follow-Up Observations of a Fermi Short GRB (Trigger 564897175)
  92. GRB 181201A: continued optical observations in Mondy
  93. GRB 181201A: VLA detection
  94. GRB 181201A: ALMA detection of a fading mm afterglow
  95. GRB 181203A: GROND detection of the afterglow
  96. GRB 181126B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 564897175)
  97. GRB 181201A: continued optical observations in TSHAO and Chilesope
  98. GRB 181203A: BOOTES-3/YA optical observations
  99. GRB 181205A: a long GRB detected by INTEGRAL
  100. GRB 180112B: AstroSat CZTI detection

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