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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"

42004 results found.

  1. GRB 161202A: Astrosat CZTI detection
  2. GRB 161202A: RATIR Optical and NIR Observations
  3. GRB 161202A: Swift-BAT refined analysis
  4. GRB 161202A: Swift/UVOT Upper Limits
  5. GRB 161202A: Swift-XRT refined Analysis
  6. GRB 161202A: MITSuME Okayama upper limits
  7. GRB 161202A: Fermi-LAT detection
  8. GRB 161202A: Swift detection of a burst
  9. GRB 161129A: Mondy optical observations
  10. Fermi GBM trigger 502258294/161201175 is not a GRB
  11. GRB 161129A: ISON/UAFO optical observations
  12. GRB 161129A: MITSuME Okayama Ks-band Observation
  13. GRB 160821B: HST detection of the optical and IR counterpart
  14. Fermi Gamma-ray Burst Monitor trigger 161130183 is not a GRB
  15. GRB 161129A: Swift-BAT refined analysis
  16. GRB 161129A: Fermi GBM Detection
  17. GRB 161129A: MITSuME Okayama Optical Observation
  18. GRB 161129A: Swift/UVOT Detection
  19. GRB 161129A: Tautenburg Ic-band observations
  20. GRB 161129A: TSHAO optical observations / possible afterglow+host galaxy
  21. GRB161129A : Astrosat CZTI detection
  22. GRB 161129A: Swift-XRT refined Analysis
  23. GRB 161129A: Swift detection of a burst
  24. Fermi GBM trigger 501785179/161125699 is not a GRB
  25. Fermi GBM trigger 501779084/161125628 is not a GRB
  26. GRB 161123A: Swift-XRT observations
  27. GRB 161123A: Tiled Swift observations
  28. GRB 161123A: MAXI/GSC detection
  29. GRB 161117A: SMARTS optical/IR afterglow observations
  30. GRB 161119A: MASTER-SAAO possible OT detection during Fermi Alert
  31. GRB 161108A: 15 GHz upper limits from AMI
  32. Swift Trigger 723124 is probably not a GRB
  33. GRB 161117B: Swift-XRT refined Analysis
  34. Konus-Wind observation of GRB 161117A
  35. GRB 161117A iTelescope observation
  36. GRB 161117A: MASTER-OAFA (Argentina) prompt OT observations
  37. GRB 161117A: TAROT La Silla observatory optical observations
  38. GRB 161117A: GMG observation limit
  39. GRB 161117A: Fermi GBM detection/observation
  40. GRB 161117B: Swift/UVOT Upper Limits
  41. GRB 161117A: Swift/UVOT Detection
  42. GRB 161117B: Swift-BAT refined analysis
  43. GRB 161117A: Swift-BAT refined analysis
  44. Swift Trigger 722681 is probably not a GRB
  45. GRB 161117A: Swift-XRT refined Analysis
  46. GRB 161117B: LCO optical observations
  47. GRB 161117B: Swift detection of a burst
  48. GRB161117A: REM optical and NIR afterglow detection
  49. GRB 161117A: VLT/X-shooter spectroscopy and redshift
  50. GRB 161117A: Swift detection of a burst with an optical counterpart
  51. GRB 161113A: Swift-BAT refined analysis
  52. GRB 161113A: Swift/UVOT Upper Limits
  53. GRB 161113A: Swift-XRT refined Analysis
  54. GRB 161113A: Kuban State University optical upper limit
  55. GRB 161113A: RATIR Optical and NIR Observations
  56. GRB 161113A: Swift detection of a burst
  57. GRB 161109A: CALET Gamma-Ray Burst Monitor detection
  58. GRB 161109A: Swift/UVOT Upper Limits
  59. GRB 161104A: Magellan imaging and spectroscopy
  60. GRB 161108A: continued TSHAO optical observations
  61. GRB 161104A: Chandra X-ray observations
  62. GRB 161109A: Lomonosov BDRG gamma ray discovery
  63. GRB 161109A: Swift-XRT observations
  64. GRB 161108A: MITSuME Okayama upper limits
  65. IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits
  66. GRB 161106A: CALET Gamma-Ray Burst Monitor detection
  67. GRB 161108A: TSHAO optical observations
  68. GRB 161108A: Swift/UVOT Upper Limits
  69. GRB 161109A: Tiled Swift observations
  70. GRB 161105A: Swift/UVOT Upper Limits
  71. GRB 161109A: Fermi GBM observation
  72. GRB 161109A: Fermi-LAT detection
  73. GRB 161106A: Lomonosov BDRG gamma ray discovery
  74. GRB 161105A: TAROT La Silla observatory optical observations
  75. GRB 161108A, Swift-BAT refined analysis
  76. GRB 161108A: NOT redshift
  77. GRB 161108A: RATIR Afterglow Confirmation
  78. GRB 161108A: Swift-XRT refined Analysis
  79. GRB 161108A: NOT candidate afterglow
  80. GRB 161108A: Swift detection of a burst
  81. Fermi LAT Gamma-ray Observations of IceCube-161103
  82. GRB 161022A: 15 GHz upper limits from AMI
  83. GRB 161017A: 15 GHz upper limits from AMI
  84. GRB 161103A: an ultra-long GRB detected by Konus-Wind
  85. GRB 161106A: Fermi GBM detection
  86. IceCube-161103: Konus-Wind upper limits
  87. GRB 161105A: Swift-XRT refined Analysis
  88. GRB 161104A: Gemini South optical observations
  89. GRB 161105A: Swift-BAT refined analysis
  90. Search for counterpart to IceCube-161103A with ANTARES
  91. GRB 161105A: MASTER-IAC early optical observations
  92. GRB 161104A: GROND observations
  93. GRB 161105A: Swift detection of a burst
  94. GRB 161104A: Swift/UVOT Upper Limits
  95. GRB 161104A, Swift-BAT refined analysis
  96. GRB 161104A: Swift-XRT refined Analysis
  97. Fermi GBM Observations of IceCube-161103
  98. GRB 160928A: The first GRB detected by POLAR
  99. IceCube-161103: Swift-XRT observations
  100. GRB 161104A: Swift detection of a short burst

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