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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"

28233 results found.

  1. GRB 150912A: A long GRB detected by INTEGRAL
  2. GRB 150911A: Swift-XRT refined Analysis
  3. GRB 150910A: AAO optical observations
  4. GRB 150910A: MITSuME Ishigakijima Optical Observation after 1 day
  5. GRB 150910A: Chuguev observatory optical observations
  6. GRB 150911A: MITSuME Okayama upper limits
  7. GRB 150910A: continued SAO RAS optical observations
  8. GRB 150911A: Enhanced Swift-XRT position
  9. GRB150911A MITSuME Okayama Ks-band upper-limit
  10. GRB 150910A: TSHAO optical observations
  11. GRB 150911A: Swift detection of a burst
  12. GRB 150910A: NOT observations of the afterglow
  13. GRB 150910A: MITSuME Okayama Ks-band Observation
  14. GRB 150910A: GROND observation of the afterglow
  15. GRB 150910A: MITSuME Ishigakijima Optical Observation
  16. GRB 150910A: SAO RAS optical photometry
  17. GRB 150910A: Swift-XRT refined Analysis
  18. GRB 150910A: Enhanced Swift-XRT position
  19. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  20. GRB 150910A: Nanshan optical observations
  21. GRB 150910A: Swift-BAT refined analysis
  22. GRB 150910A: MITSuME Okayama Optical Observation
  23. GRB 150910A: Swift detection of a burst with an optical afterglow
  24. GRB 150907B: Swift-XRT refined Analysis
  25. IPN Triangulation of GRB 150906B (short/intense)
  26. GRB 150907B: Swift-BAT refined analysis
  27. GRB150907A: Swift/UVOT observations
  28. GRB 150907B: Enhanced Swift-XRT position
  29. GRB 150907B: GROND Upper Limits
  30. GRB 150907B: Swift-XRT observations
  31. GRB 150907A: Swift-XRT observations
  32. GRB 150907A: MAXI/GSC detection
  33. GRB 150906A: Fermi GBM detection
  34. GRB 150818A: TSHAO and SAO RAS optical observations
  35. GRB 150902A: Swift-XRT afterglow detection
  36. ANTARES neutrino detection: ANU 2.3m and Kepler K2 Observations of the Swift x-ray source
  37. GRB 150902A: Swift/UVOT Upper Limits
  38. GRB 150902A: Swift-XRT observations
  39. GRB 150831A: 9.8 GHz VLA upper limits
  40. GRB 150901A, Swift-BAT refined analysis
  41. ANTARES neutrino detection and possible Swift X-ray counterpart
  42. GRB 150902A: Fermi-LAT detection
  43. GRB 150831B: Swift/UVOT Upper Limits
  44. Konus-Wind observation of GRB 150831A
  45. GRB 150901A: Swift detection of a burst
  46. GRB 150821A: Flattening in the UVOT light curve
  47. GRB 150831B: Swift-BAT refined analysis
  48. GRB 150831B: Swift-XRT refined Analysis
  49. GRB 150831B: Fermi GBM detection
  50. GRB 150831A: GROND Upper Limits
  51. GRB 150831A: Swift/UVOT Upper Limits
  52. GRB 150831B: Swift-XRT observations
  53. GRB 150831A: Swift-XRT refined Analysis
  54. GRB 150831A: Swift-BAT refined analysis
  55. GRB 150831A: Enhanced Swift-XRT position
  56. GRB 150831A: optical upper limit ISON-SSO
  57. GRB 150831A: Swift detection of a short burst
  58. GRB 150824A: Fermi GBM detection
  59. GRB 150821A: LCOGT Siding Springs early observations
  60. Konus-Wind observation of GRB 150818A
  61. GRB 150821A: LCOGT Sutherland observations
  62. GRB 150821A, Swift-BAT refined analysis
  63. GRB 150821A: GROND afterglow observations
  64. GRB 150821A: Swift-XRT refined Analysis
  65. GRB 150819A: Mondy and TSHAO optical upper limits
  66. GRB 150821A: Swift/UVOT Detection
  67. GRB 150821A: Enhanced Swift-XRT position
  68. GRB 150821A: Swift detection of a burst with an optical afterglow
  69. GRB150819A: NOT imaging
  70. GRB 150818A: Continued NOT monitoring - afterglow confirmation
  71. GRB 150819B: Fermi GBM detection
  72. GRB 150818A: 10.4m GTC spectroscopy and host galaxy
  73. GRB 150818A: Mondy optical observations
  74. GRB 150818A: MITSuME Ishigakijima upper limits
  75. GRB 150819A: RATIR Optical Observations
  76. GRB 150819A: Swift-XRT refined Analysis
  77. GRB 150819A: Swift-BAT refined analysis
  78. GRB 150819A: MASTER-IAC early upper limit
  79. GRB 150819A: Swift/UVOT Upper Limits
  80. GRB 150819A: Enhanced Swift-XRT position
  81. GRB150818A: NOT imaging
  82. GRB 150819A: Swift detection of a burst
  83. GRB 150818A: Swift-XRT refined Analysis
  84. GRB 150818A: Swift/UVOT Detection
  85. GRB 150817A: AAO optical observations
  86. GRB 150818A: Enhanced Swift-XRT position
  87. GRB 150817A: LCOGT observations
  88. GRB 150818A: Swift-BAT refined analysis
  89. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  90. GRB 150818A: Swift/UVOT candidate afterglow
  91. GRB 150818A: Swift detection of a burst
  92. GRB 150817A: Swift/UVOT Upper Limits
  93. GRB 150817A: Swift-BAT refined analysis
  94. GRB 150817A: Swift-XRT refined Analysis
  95. GRB 150817A: Enhanced Swift-XRT position
  96. GRB 150817A: Continued RATIR Observations, Revised Candidate
  97. GRB 150817A: RATIR Optical Afterglow Candidate
  98. GRB 150817A: Swift detection of a burst
  99. GRB 150811A: Continued RATIR Observations
  100. GRB 150811A: Continued RATIR Observations

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