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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"

27588 results found.

  1. LIGO/Virgo G184098: VST-ESO PARANAL observations
  2. LIGO/Virgo G184098: Pan-STARRS1 observations of the northern sky region
  3. LIGO/Virgo G184098: observations by MASTER
  4. LIGO/Virgo G184098: TAROT La Silla Observatory optical observations (TZAC)
  5. LIGO/Virgo G184098: Swift follow-up observations
  6. LIGO/Virgo G184098: Burst candidate in LIGO engineering run data
  7. GRB 150915A: Swift-XRT refined Analysis
  8. GRB 150915A, Swift-BAT refined analysis
  9. Konus-Wind observation of GRB 150911A
  10. GRB 150915A: NOT observations of a brightening afterglow
  11. GRB 150915A: Swift UVOT upper limits
  12. GRB 150915A: VLT/X-shooter redshift
  13. GRB 150915A: GROND detection of an optical counterpart candidate
  14. GRB 150915A: MASTER-NET optical observations
  15. GRB 150915A: Swift detection of a burst
  16. GRB 150910A: T100 observations
  17. GRB 150911A: GROND Upper Limits
  18. GRB 150910A: Continued RATIR Observations
  19. GRB 150912A: Swift-XRT and UVOT observations
  20. GRB 150911A: Khureltogot upper limit
  21. Fermi GBM trigger 463890496/150914103 is not a GRB
  22. GRB 150910A: RATIR Observations
  23. GRB 150912A: MASTER-IAC optical observations
  24. GRB 150912A: Fermi GBM observation
  25. GRB150911A: P60 Observations
  26. GRB 150911A: Swift/UVOT Upper Limits
  27. GRB 150911A: Swift-BAT refined analysis
  28. GRB 150911A: Swift-XRT refined Analysis
  29. GRB150911A MITSuME Okayama Ks-band upper-limit
  30. GRB 150911A: Swift detection of a burst
  31. GRB 150910A: MITSuME Okayama Ks-band Observation
  32. GRB 150910A: GROND observation of the afterglow
  33. GRB 150910A: SAO RAS optical photometry
  34. GRB 150910A: Swift-XRT refined Analysis
  35. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  36. GRB 150910A: Swift-BAT refined analysis
  37. GRB 150910A: LCOGT FTN afterglow observations
  38. GRB 150910A: Swift detection of a burst with an optical afterglow
  39. Swift Trigger 654954 is not an astrophysical event
  40. Fermi GBM trigger 463422723/150908689 is not a GRB
  41. GRB 150907B: Swift-XRT refined Analysis
  42. IPN Triangulation of GRB 150906B (short/intense)
  43. Fermi GBM trigger 463339482/150907725 is too weak to be classified
  44. GRB 150907B: Swift-BAT refined analysis
  45. GRB150907A: Swift/UVOT observations
  46. GRB 150907B: MASTER-SAAO early optical observations
  47. GRB 150907B: GROND Upper Limits
  48. GRB 150907B: Swift-XRT observations
  49. GRB 150907B: Swift detection of a burst
  50. Fermi GBM trigger 150907763 is not a GRB
  51. GRB 150906A: Fermi GBM detection
  52. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  53. GRB 150902A: Swift/UVOT Upper Limits
  54. GRB 150902A: MASTER-SAAO optical observations
  55. GRB 150901A, Swift-BAT refined analysis
  56. GRB 150902A: Fermi GBM detection
  57. GRB 150902A: Fermi-LAT detection
  58. GRB 150831B: Swift/UVOT Upper Limits
  59. Konus-Wind observation of GRB 150831A
  60. GRB 150901A: Swift detection of a burst
  61. GRB 150831B: Swift-BAT refined analysis
  62. GRB 150831B: Swift-XRT refined Analysis
  63. GRB 150831B: MASTER-IAC early optical observations
  64. GRB 150831B: Fermi GBM detection
  65. GRB 150831A: GROND Upper Limits
  66. GRB 150831A: Swift/UVOT Upper Limits
  67. GRB 150831B: Swift-XRT observations
  68. GRB 150831A: Swift-XRT refined Analysis
  69. GRB 150831B: Swift detection of a probable burst
  70. GRB 150831A: Swift-BAT refined analysis
  71. GRB 150831A: optical upper limit ISON-SSO
  72. GRB 150831A: Swift detection of a short burst
  73. Fermi GBM trigger 150829183 is not a GRB
  74. Fermi GBM trigger 150828520 is not a GRB
  75. Fermi GBM trigger 150827524 is not a GRB
  76. Fermi GBM trigger 150826536 is not a GRB
  77. GRB 150824A: Fermi GBM detection
  78. Konus-Wind observation of GRB 150821A
  79. GRB 150821A: LCOGT Siding Springs early observations
  80. Konus-Wind observation of GRB 150818A
  81. GRB 150821A: LCOGT Sutherland observations
  82. GRB 150821A, Swift-BAT refined analysis
  83. GRB 150821A: GROND afterglow observations
  84. GRB 150821A: Swift-XRT refined Analysis
  85. GRB 150821A: Swift/UVOT Detection
  86. GRB 150821A: Fermi GBM detection
  87. Swift Trigger 652824 is due to noise
  88. GRB 150821A: VLT/X-shooter redshift
  89. GRB 150821A: Swift detection of a burst with an optical afterglow
  90. Swift Trigger 652824: Is most likely a noise fluctuation in the direction of M31
  91. GRB 150819B: Fermi GBM detection
  92. GRB 150818A: 10.4m GTC spectroscopy and host galaxy
  93. IPN Triangulation of GRB 150819B (short / very intense)
  94. GRB 150818A: Mondy optical observations
  95. GRB 150819A: RATIR Optical Observations
  96. GRB 150819A: Swift-XRT refined Analysis
  97. GRB 150819A: Swift-BAT refined analysis
  98. GRB 150819A: MASTER-IAC early upper limit
  99. GRB 150819A: Swift/UVOT Upper Limits
  100. GRB 150818A: Swift-XRT update, correction to GCN 18162

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