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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"

27594 results found.

  1. GRB 140509A: GROND afterglow detection
  2. GRB 141028A: Continued RATIR Observations
  3. GRB 141028A: Swift/UVOT followup observations
  4. GRB 141029B: Fermi GBM detection
  5. GRB 141028A: Swift-XRT observations
  6. GRB 141028A: LCOGTN observations
  7. GRB141028A: Gemini-North redshift
  8. GRB 141028A: RATIR Optical and NIR Observations
  9. GRB 141028A: Swift/UVOT Detection
  10. GRB 141028A: Swift/XRT detection of the X-ray afterglow
  11. GRB 141028A: GROND Afterglow confirmation (MASTER source)
  12. GRB 141028A: Fermi GBM detection
  13. GRB 141026A: Continued RATIR Optical and NIR Observations
  14. GRB 141028A: Fermi-LAT detection
  15. GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
  16. GRB 141026A: SAO RAS Zeiss-1000 observations
  17. GRB 141026A: Continued RATIR Optical and NIR Observations
  18. GRB 141026A: Swift/UVOT Upper Limits
  19. GRB 141004A: Continued RATIR Late Time Optical and NIR Observations
  20. GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection
  21. GRB 141026A: Swift-XRT refined Analysis
  22. GRB 141026A: Swift-BAT refined analysis
  23. Fermi Gamma-ray Burst Monitor trigger 141026452 is not a GRB
  24. GRB 141026A: MASTER early optical observations
  25. GRB141026A: Deep P200 optical imaging
  26. GRB 141026A: GROND observations
  27. GRB 141026A: RATIR Optical Observations
  28. GRB 141026A: P60 early observations
  29. GRB 141026A: Swift detection of a burst
  30. Fermi Gamma-ray Burst Monitor trigger 141025734 is not a GRB
  31. GRB141022A: Fermi GBM Detection
  32. GRB141022B: Fermi GBM Detection
  33. GRB 141022A: Swift/UVOT Upper Limits
  34. GRB 141022A: Swift-BAT refined analysis
  35. GRB 141022A: Swift-XRT refined Analysis
  36. GRB141015A iTelescope observation
  37. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate
  38. GRB 141022A: Swift detection of a burst
  39. GRB 141004A: RATIR Late Time Optical and NIR Observations
  40. GRB 141020A: Swift-BAT refined analysis
  41. GRB 141020A: Swift-XRT refined Analysis
  42. GRB 141020A: Swift/UVOT Detection
  43. Konus-Wind observation of GRB 141017A
  44. GRB 141020A: Swift detection of a burst with an optical counterpart
  45. GRB 141017A, Swift-BAT refined analysis
  46. GRB 141017A: GROND Afterglow Confirmation
  47. GRB 141015A: Swift-XRT afterglow confirmation and refined Analysis
  48. GRB 141017A: Swift/UVOT Detection
  49. GRB 141017A: Swift-XRT refined Analysis
  50. GRB 141017A: Zadko observatory - Gingin optical observations
  51. GRB 141017A: Swift detection of a burst
  52. GRB 141015A: Swift/UVOT Upper Limits
  53. GRB 141015A: Swift-BAT refined analysis
  54. GRB 141015A: LCO-McDonald observations
  55. GRB 141015A: RATIR Optical Upper Limits
  56. GRB 141015A: Super-LOTIS early observations
  57. GRB 141015A: Swift/XRT localization
  58. GRB 141015A: Swift detection of a burst
  59. Fermi Gamma-ray Burst Monitor trigger 141014781 is not a GRB
  60. IPN Triangulation of GRB 141011A (short/hard)
  61. GRB 141011A: Fermi GBM detection
  62. Trigger 614903: Swift detection of IGR J17544-2619
  63. GRB 141005A: iTelescope.Net T21 Optical Observation
  64. GRB 141005A: Additional P60 imaging and afterglow confirmation
  65. GRB 141004A: Fermi GBM observation
  66. GRB 141004A: GROND observations
  67. GRB 141005A: GROND observations
  68. Konus-Wind observation of GRB 141005A
  69. GRB 141004A: Swift-XRT refined Analysis
  70. GRB 141005A: Swift-XRT refined Analysis
  71. GRB 141005A: Swift/UVOT Upper Limits
  72. GRB 141005A: Swift-BAT refined analysis
  73. GRB 141004A: Swift-BAT refined analysis
  74. GRB141004A: NOT imaging and spectroscopy
  75. GRB 141004A: Swift/UVOT Detection
  76. GRB 141005A: Fermi GBM Detection
  77. GRB 141004A: RATIR Optical Observations
  78. GRB 141004A: Monte Agliale Observatory optical observations
  79. GRB 141005A: RATIR Optical Observations
  80. GRB 141005A: P60 probable afterglow deteaction
  81. GRB 141005A: Swift detection of a burst
  82. GRB 141004A: Swift detection of a burst with an optical counterpart
  83. Swift observations of HD 305560
  84. GRB 140928A: Swift-XRT follow-up observations
  85. GRB 140930B: MASTER early possible OT detection
  86. Swift possible detection of the Be star HD 305560
  87. GRB 140930B: Gemini South Spectroscopy
  88. GRB 140930B: GROND observations
  89. GRB 140930A/MAXI J2259+524: MASTER optical observations
  90. GRB 140930B Swift-BAT refined analysis
  91. GRB 140930B: Swift/UVOT Upper Limits
  92. Konus-Wind observation of GRB 140930B
  93. GRB 140930B: Swift-XRT refined Analysis
  94. GRB 140928A: MAXI-GSC detection
  95. GRB 140930B: ISON-Kislovodsk observations
  96. GRB 140930B: MASTER early optical observations
  97. GRB 140930B: Swift detection of a short burst
  98. GRB 140928A: LCO-Cerro Tololo further observations
  99. IPN Triangulation of GRB 140928A
  100. GRB 140928A: LCO-Cerro Tololo observations

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