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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"

36139 results found.

  1. GRB 190203A: Swift-BAT refined analysis
  2. GRB 190204A: Swift-BAT refined analysis
  3. GRB 190202A: Xinglong-2.16m optical observations
  4. GRB 190202A: SAO RAS further optical observations
  5. Konus-Wind observation of GRB 190204A
  6. GRB 190204A: SAO RAS optical observations
  7. GRB 190204A: Mondy optical upper limit
  8. GRB 190203A: AstroSat CZTI detection
  9. GRB190203A: UVOT analysis
  10. GRB 190203A: COATLI Optical Observations
  11. GRB 190204A: Swift/UVOT Detection
  12. GRB 190204A: Enhanced Swift-XRT position
  13. GRB 190204A: COATLI Optical Detection of the Fading Afterglow
  14. GRB 190203A: Liverpool Telescope near-IR observations
  15. Konus-Wind observation of GRB 190203A
  16. GRB 190203A: Swift-XRT refined Analysis
  17. GRB 190204A: Swift-XRT refined Analysis
  18. GRB 190204A: AstroSat CZTI detection
  19. Swift Trigger 887541: MASTER inspect
  20. GRB 190204A: MAXI/GSC detection
  21. GRB 190202A: R and I band observation from HCT
  22. GRB 190204A: Swift detection of a burst with a possible optical counterpart
  23. GRB 190203A: MASTER OT detection
  24. GRB 190203A: Enhanced Swift-XRT position
  25. GRB 190203A: SAO RAS optical observations, afterglow fading
  26. GRB 190203A: Koshka Zeiss-1000 optical upper limit
  27. GRB 190203A: Swift detection of a burst with an optical counterpart
  28. GRB 190202A: SAO RAS optical observations
  29. GRB 190202A: TSHAO optical observations
  30. GRB 190202A: NOT optical observations
  31. GRB 190202A: McDonald 0.8-m telescope optical observation
  32. GRB 190202A: Swift-XRT refined Analysis
  33. GRB 190202A: LCO-CTIO optical observations
  34. GRB 190202A: Fermi GBM observation
  35. Fermi GBM trigger 570825115/190202772 is not a GRB
  36. GRB 190202A, Swift-BAT refined analysis
  37. GRB 190202A: AGILE ratemeters detection
  38. GRB 190202A: Swift/UVOT Detection
  39. GRB 190202A: GOTO optical observations
  40. GRB 190202A: Enhanced Swift-XRT position
  41. GRB 190202A: Koshka Zeiss-1000 optical observations
  42. GRB 190202A: Swift detection of a burst with an optical counterpart
  43. Fermi GBM trigger 570716645/190201517 is not a GRB
  44. GRB 190131A: Insight-HXMT/HE detection
  45. GRB 190131A: AstroSat CZTI detection
  46. GRB 190126A: AstroSat CZTI detection
  47. Fermi GBM trigger 570659556/190131856 is not a GRB
  48. GRB 190129B: Insight-HXMT/HE detection
  49. GRB 190114C: JCMT SCUBA-2 sub-mm observations
  50. Improved IPN error box for GRB 190129B
  51. GRB 190129B: GOTO optical observations
  52. GRB 190129B: DDOTI Detection of the Possible Afterglow and Suggestion of Fading
  53. GRB 190129B: Swift/UVOT Upper Limits
  54. GRB 190129B: ePESSTO NTT optical observations
  55. GRB 190129B: AstroSat CZTI detection
  56. GRB 190129B: MASTER Global Robotic Net optical observation
  57. GRB 190129A: CALET Gamma-Ray Burst Monitor detection
  58. GRB 190129B: GROND possible host candidate
  59. GRB 190129B: Swift-XRT candidate afterglow detection
  60. GRB 190129B: Tiled Swift observations
  61. Fermi GBM Observations of IceCube-190124A
  62. GRB 190129A: Fermi GBM detection
  63. Konus-Wind observation of extremely bright GRB 190129B
  64. IPN Triangulation of GRB 190129B (long/extremely bright)
  65. INTEGRAL observation of IceCube-190124A
  66. GRB 190129A: MAXI/GSC detection
  67. Swift Trigger 886157: MASTER optical observation
  68. INTEGRAL triggers from 8205 to 8211 are due to MAXI J1348-630, NOT to a GRB
  69. GRB 190114C: Optical follow-up from HCT
  70. GRB 190117A: AstroSat CZTI detection
  71. GRB 190122B: AstroSat CZTI detection
  72. GRB 190123A: IKI-GRB-FuN optical upper limit
  73. GRB 190123A: NEXT-0.6m optical limit
  74. GRB 190114C: CHILESCOPE optical observations
  75. GRB 190123A: AROMA-N Optical Observation
  76. GRB 190123A: Swift/UVOT Upper Limits
  77. Konus-Wind observation of GRB 190122A
  78. Konus-Wind of observation of GRB 190117A
  79. GRB 190123A: COATLI Optical Observations
  80. GRB 190123A: Swift-BAT refined analysis
  81. GRB 190121A: CALET Gamma-Ray Burst Monitor detection of a short burst
  82. GRB190123A: MITSuME Akeno optical upper limits
  83. GRB 190123A: GMG observational limit
  84. GRB 190123A: Swift-XRT refined Analysis
  85. GRB 190123A: GOTO optical limit
  86. GRB 190123A: Fermi GBM observation
  87. GRB 190123A: BOOTES-4/MET optical limit
  88. GRB 190123A: Enhanced Swift-XRT position
  89. GRB 190123A: MASTER Global Robotic Net optical observation
  90. GRB 190123A: Swift detection of a burst
  91. GRB 190122A: Fermi GBM observation
  92. GRB 190122A: Fermi-LAT detection
  93. GRB 190114C: RTT150 optical observations
  94. IPN Triangulation of GRB 190118A (long)
  95. IPN Triangulation of GRB 190117A (long)
  96. GRB 190114C: GMRT detection at 1.26GHz
  97. GRB 190114C: MeerKAT radio observation
  98. GRB 190117A: Insight-HXMT/HE detection
  99. GRB 190114C: UKIRT JHK observation (CORRECTIONS)
  100. GRB 190114C: UKIRT JHK observation continuation - steady fading?

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