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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"

16298 results found.

  1. GRB 190311A: NOT optical counterpart
  2. GRB190305A: MASTER Global Robotic Net optical observation
  3. GRB 190311A: Mondy optical observations
  4. GRB 190311A: GMG observation
  5. GRB 190311A: TSHAO optical observations
  6. GRB190311A: MASTER Global Robotic Net OT optical observation
  7. GRB 190311A: NEXT-0.6m optical afterglow detection
  8. GRB 190311A: Mondy optical observations
  9. GRB 190311A: Swift detection of a burst with optical counterpart
  10. IceCube-190221A: MASTER Global Robotic Net optical observation
  11. GRB 190219A: CrAO and AbAO optical upper limit
  12. GRB 190220B: Kitab Observatory optical upper limit
  13. GRB 190220B: BOOTES-4 optical observation
  14. GRB 190219A: NOT optical afterglow candidate
  15. GRB 190219A: NEXT-0.6m optical upper limit
  16. GRB 190220A: Swift detection of a burst with an optical counterpart
  17. GRB190219A: MASTER Global Robotic Net optical observation
  18. GRB 190219A: BOOTES-1 optical limits
  19. GRB190211A: GROWTH-India detection of optical afterglow
  20. GRB 190211A: Swift/UVOT Detection
  21. GRB 190211A: DOAO optical observation
  22. GRB190211A: MITSuME Akeno optical observation
  23. GRB 190211A: NOT optical observations
  24. GRB 180703A: VLT/MUSE host galaxy redshift measurement
  25. GRB 190211A: BOOTES-4/MET optical afterglow confirmation
  26. GRB190211A: MASTER Global Robotic Net optical observation
  27. GRB 190211A: NEXT-0.6m optical afterglow detection
  28. GRB 190202A: Terskol 2-m optical observations
  29. GRB 190203A: Mondy optical observations
  30. GRB190202A: GROWTH-India detection of optical afterglow
  31. GRB 190202A: Xinglong-2.16m optical observations
  32. GRB 190202A: SAO RAS further optical observations
  33. GRB 190204A: SAO RAS optical observations
  34. GRB 190204A: Mondy optical upper limit
  35. GRB 190203A: COATLI Optical Observations
  36. GRB 190204A: COATLI Optical Detection of the Fading Afterglow
  37. GRB 190204A: Swift detection of a burst with a possible optical counterpart
  38. Swift Trigger 887541: MASTER optical observation
  39. GRB 190203A: MASTER OT detection
  40. GRB 190203A: SAO RAS optical observations, afterglow fading
  41. GRB 190203A: Koshka Zeiss-1000 optical upper limit
  42. GRB 190203A: Swift detection of a burst with an optical counterpart
  43. GRB 190202A: SAO RAS optical observations
  44. GRB 190202A: TSHAO optical observations
  45. GRB 190202A: NOT optical observations
  46. GRB 190202A: McDonald 0.8-m telescope optical observation
  47. GRB 190202A: LCO-CTIO optical observations
  48. GRB 190202A: GOTO optical observations
  49. GRB 190202A: Koshka Zeiss-1000 optical observations
  50. GRB 190202A: Swift detection of a burst with an optical counterpart
  51. GRB 190129B: GOTO optical observations
  52. GRB 190129B: Swift/UVOT Upper Limits
  53. GRB 190129B: ePESSTO NTT optical observations
  54. GRB 190129B: MASTER Global Robotic Net optical observation
  55. Swift Trigger 886157: MASTER optical observation
  56. GRB 190114C: Optical follow-up from HCT
  57. Swift Trigger 885960: A third Swift trigger on MAXI J1348-630
  58. GRB 190123A: IKI-GRB-FuN optical upper limit
  59. GRB 190123A: NEXT-0.6m optical limit
  60. GRB 190114C: CHILESCOPE optical observations
  61. GRB 190123A: AROMA-N Optical Observation
  62. GRB 190123A: Swift/UVOT Upper Limits
  63. GRB 190123A: COATLI Optical Observations
  64. GRB190123A: MITSuME Akeno optical upper limits
  65. GRB 190123A: GMG observational limit
  66. GRB 190123A: GOTO optical limit
  67. GRB 190123A: BOOTES-4/MET optical limit
  68. GRB 190123A: MASTER Global Robotic Net optical observation
  69. GRB 190114C: RTT150 optical observations
  70. GRB 190114C: UKIRT JHK observation continuation - steady fading?
  71. GRB 190114C: REM optical/NIR detection (CORRECTION)
  72. GRB 190114C: RATIR Optical and NIR Detections
  73. GRB 190114C: RT-22 detection at 36.8 GHz
  74. GRB 190114C: COATLI Optical Detection
  75. GRB 190114C: ePESSTO NTT optical observations
  76. GRB 190114C: Continued UKIRT JHK observation
  77. GRB 190114C: continued CHILESCOPE optical obs
  78. GRB190114C: ATCA detection of the radio afterglow
  79. GRB 190106A: Discovery Channel Telescope observations
  80. GRB 190114B: continued optical observations in Mondy
  81. GRB 190114C: Optical detection from HCT
  82. GRB 190114C: CHILESCOPE optical observations
  83. GRB 190114A:DOAO/LOAO optical observation
  84. GRB 190114C: KMTNet optical observation
  85. GRB190114C: GRowth-India detection of optical afterglow
  86. GRB 190114C: LSGT optical observation
  87. GRB 190114A: DOAO/LOAO optical observation
  88. GRB 190114C: REM optical/NIR detection
  89. GRB 190114C: ALMA detection of a fading mm counterpart
  90. GRB 190114C: Mondy optical observations
  91. GRB 190114C: VLA Detection
  92. GRB 190114C: Swift/UVOT Detection
  93. GRB 190114B: Liverpool Telescope near-IR observations
  94. GRB 190114B: optical afterglow observations in Mondy and Abastumani observatories
  95. GRB 190114B: Swift/UVOT Upper Limits
  96. GRB 190114A: Swift/UVOT Observations
  97. GRB 190114A: Mondy optical afterglow detectio
  98. GRB 190114C: Optical observations
  99. GRB 190114C: A type 1 BdHN with TeV emission
  100. GRB 190114B: NOT optical counterpart

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