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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"

36132 results found.

  1. GRB 190109A: Enhanced Swift-XRT position
  2. GRB 190109A: Prompt enhanced Swift-XRT position
  3. GRB 190109A: Swift detection of a burst
  4. GRB 190106A: Mondy optical observations
  5. GRB 190106A : continued TSHAO optical observations
  6. Konus-Wind observation of GRB 190106A
  7. GRB 190106A: NEXT-0.6m and Xinglong-2.16m photometric single powerlaw decay
  8. IERCOO/ICSP optical observation of GRB 190106A
  9. GRB 190106A: GMG photometry in the 2nd night
  10. GRB 190106A: Swift-XRT refined Analysis
  11. GRB 190106A: VLT/X-shooter redshift confirmation
  12. GRB 190103B: CALET Gamma-Ray Burst Monitor detection
  13. GRB 190106A: GMG spectral results
  14. GRB 190106A: update of the Xinglong-2.16m spectroscopy
  15. GRB 190106A: OASDG optical observations
  16. GRB 190106A: BOOTES-4/MET optical observations
  17. GRB 190106A: Swift/UVOT Detection
  18. GRB 190106A: Swift-BAT refined analysis
  19. GRB 190106A: Bassano Bresciano Observatory optical detection
  20. GRB 190106A: Xinglong-2.16m spectroscopy
  21. GRB 190106A: GWAC-F60B optical detection
  22. GRB 190106A : TSHAO optical observations
  23. GRB 190106A: Enhanced Swift-XRT position
  24. GRB 190106A: GMG detection
  25. GRB 190106A: MITSuME Akeno optical observation
  26. GRB 190106A: MASTER Amur OT detection
  27. GRB 190106A: Swift detection of a burst with an optical counterpart
  28. Konus-Wind observation of GRB 190103B
  29. GRB 190103A: AstroSat CZTI detection
  30. GRB 190103B: Bassano Bresciano observatory upper limit
  31. GRB 190103B: Swift-BAT refined analysis
  32. GRB 190103B: Swift-XRT refined Analysis
  33. GRB 190103B: Enhanced Swift-XRT position
  34. GRB 190103B: Swift detection of a burst
  35. GRB 181201A: photometric signature of the SN
  36. GRB 190103A: AGILE/MCAL detection of a burst
  37. GRB 181231A: BOOTES-2/TELMA optical observations
  38. GRB 181231A: Fermi GBM detection
  39. GRB 181231A: Fermi-LAT detection
  40. GRB 181228A: Mondy and AbAO optical upper limits
  41. GRB 181225A: further Swift-XRT observations
  42. GRB 181228A: Global MASTER Net OT is the same REM IR transient
  43. GRB 181228A: possible NOT optical detection
  44. Fermi GBM trigger 567868083/181230547 is not a GRB
  45. GRB 181227A: CALET Gamma-Ray Burst Monitor detection
  46. GRB 181228A: MITSuME Akeno optical upper limits
  47. Konus-Wind observation of GRB 181227A
  48. GRB 181228A: Xinglong-2.16m optical upper limit
  49. GRB 181227A: Global MASTER Net oprtical inspection
  50. Swift Trigger 880127 is not a GRB
  51. GRB 181228A: Swift-XRT refined Analysis
  52. GRB 181228A: Swift-BAT refined analysis
  53. GRB 181222B: Swift follow-up observations of MASTER optical transient J204928.79+245744.0
  54. GRB 181228A: Swift/UVOT Upper Limits
  55. GRB 181228A: TSHAO optical upper limit
  56. GRB 181228A: Fermi GBM observation
  57. IPN Triangulation of GRB 181227A (long)
  58. GRB 181228A: Global MASTER Net OT detection
  59. GRB 181228A: REM NIR detection
  60. GRB 181228A: Enhanced Swift-XRT position
  61. GRB 181225A: CALET Gamma-Ray Burst Monitor detection
  62. GRB 181225A: KAIT Follow-Up Observations with Upper Limit
  63. GRB 181228A: KAIT Optical Upper Limit
  64. GRB 181228A: Swift detection of a burst
  65. GRB 181227A: Fermi GBM detection
  66. GRB 181222B: Swift ToO observations
  67. GRB 181225A: Insight-HXMT/HE detection
  68. GRB 181222A: AstroSat CZTI detection
  69. GRB 181225A: Swift observations and X-ray candidate afterglow
  70. GRB 181225A: Global MASTER Net optical observations
  71. GRB 181225A: Swift ToO observations
  72. GRB 181225A: Fermi GBM detection
  73. GRB 181225A: Fermi-LAT Detection
  74. GRB 181225A: AGILE/MCAL detection of a burst
  75. Konus-Wind observation of GRB 181222A
  76. GRB 181222B: Global MASTER Net observations of short bright Fermi GRB
  77. Konus-Wind observation of GRB 181222B
  78. IPN Triangulation of extremely bright short GRB 181222B
  79. GRB 181224A: Swift-BAT refined analysis
  80. GRB 181224A: Swift detection of a burst
  81. GRB 181222A: CALET Gamma-Ray Burst Monitor detection
  82. GRB 181222B: Global MASTER Net observations of the short bright Fermi GRB error box.
  83. GRB 181222B : Fermi GBM detection
  84. GRB 181222A: Fermi GBM observation
  85. GRB 181222A: MAXI/GSC detection
  86. GRB 181217A: Insight-HXMT/HE detection
  87. GRB 181213A: Swift/UVOT Observations
  88. GRB 181213A: Mondy optical observations
  89. GRB 181213A: continued TSHAO optical observations
  90. GRB 181213A:Insight-HXMT/HE detection
  91. GRB 181212A:Insight-HXMT/HE detection
  92. Konus-Wind observation of GRB 181212A
  93. GRB 181213A: AbAO optical observations
  94. GRB 181213A: HMM-0.5m, NEXT-0.6m, CNEOST-1m optical observations
  95. GRB 181213A: NOT optical observations
  96. GRB 181213A: Swift-XRT refined Analysis
  97. GRB 181213A: Enhanced Swift-XRT position
  98. IPN Triangulation of GRB 181212A (long)
  99. GRB 181213A: Swift-BAT refined analysis
  100. GRB 181213A: GWAC-F60A upper limit

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