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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"

12344 results found.

  1. GRB 150915A: MASTER-NET optical observations
  2. GRB 150915A: Swift detection of a burst
  3. GRB 150911A: GROND Upper Limits
  4. GRB 150912A: Swift-XRT and UVOT observations
  5. GRB 150911A: Chuguev observatory upper limit
  6. GRB 150911A: Mt. Terskol observatory upper limit
  7. GRB 150911A: Khureltogot upper limit
  8. GRB 150912A: MITSuME Ishigakijima upper limits
  9. GRB 150910A: MITSuME Ishigakijima Optical Observation after 2 days
  10. GRB 150912A: MASTER-IAC optical observations
  11. GRB 150911A: Swift/UVOT Upper Limits
  12. GRB 150910A: MITSuME Ishigakijima Optical Observation after 1 day
  13. GRB 150911A: MITSuME Okayama upper limits
  14. GRB150911A MITSuME Okayama Ks-band upper-limit
  15. GRB 150911A: Swift detection of a burst
  16. GRB 150910A: GROND observation of the afterglow
  17. Konus-Wind observation of GRB 150906B
  18. GRB150907A: Swift/UVOT observations
  19. GRB 150907B: GROND Upper Limits
  20. GRB 150907A: Swift-XRT observations
  21. GRB 150907A: MAXI/GSC detection
  22. GRB 150902A: Swift/UVOT Upper Limits
  23. GRB 150902A: Swift-XRT observations
  24. GRB 150831A: 9.8 GHz VLA upper limits
  25. GRB 150902A: MASTER-SAAO optical observations
  26. GRB 150831B: Swift/UVOT Upper Limits
  27. GRB 150831A: GROND Upper Limits
  28. GRB 150831A: Swift/UVOT Upper Limits
  29. GRB 150831A: optical upper limit ISON-SSO
  30. GRB 150831A: Swift detection of a short burst
  31. GRB 150819A: Mondy and TSHAO optical upper limits
  32. GRB 150821A: Swift/UVOT Detection
  33. KAIT Optical Upper Limits for GRB 120422A, 120724A, 120803B, 120911A, and 120923A
  34. Konus-Wind observation of GRB 150819B
  35. GRB 150818A: MITSuME Ishigakijima upper limits
  36. GRB 150819A: RATIR Optical Observations
  37. GRB 150818A: MITSuME Akeno optical upper limits
  38. GRB 150819A: MASTER-IAC early upper limit
  39. GRB 150819A: Swift/UVOT Upper Limits
  40. GRB 150819A: Swift detection of a burst
  41. GRB 150818A: Swift/UVOT Detection
  42. GRB 150817A: AAO optical observations
  43. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  44. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  45. GRB 150817A: Swift/UVOT Upper Limits
  46. GRB 150817A: Continued RATIR Observations, Revised Candidate
  47. GRB 150817A: RATIR Optical Afterglow Candidate
  48. GRB 150811A: Continued RATIR Observations
  49. GRB 150811A: Continued RATIR Observations
  50. Konus-Wind observation of GRB 150811B
  51. Swift Trigger 652046 is probably not a GRB
  52. GRB 150811A: Continued RATIR Observations
  53. GRB 150811A: Swift/UVOT further observations
  54. GRB 150811A: Swift detection of a burst
  55. GRB 150801A: Swift-XRT observations
  56. GRB 150801B: Swift/UVOT Upper Limits
  57. GRB 150801B: Swift detection of a burst
  58. GRB 150801A: MAXI/GSC detection
  59. GRB150724B: Retraction of the uvot detection
  60. GRB 150727A: Continued RATIR Optical Observations - Fading
  61. GRB 150728A: Swift/UVOT Upper Limits
  62. GRB 150727A: RATIR Optical Observations
  63. GRB 150727A: Watcher optical upper limit
  64. GRB 150727A: Swift/UVOT Detection
  65. GRB 150724B: MASTER upper limit
  66. GRB 150724B: Swift/UVOT Detection
  67. Konus-Wind observation of GRB 150724B
  68. GRB 150724B: Swift-XRT observations
  69. GRB 150725A: MAXI/GSC detection
  70. Swift IGR J00291+5934: MASTER Optical flare detection
  71. GRB 150724A: Swift/UVOT Upper Limits
  72. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  73. GRB 150724A: Swift detection of a burst
  74. GRB 150722A: Swift/UVOT Upper Limits
  75. GRB 150720A: Swift/UVOT Upper Limits
  76. Swift Trigger 649706: a possible GRB or bright Galactic transient
  77. GRB 150716A: KAIT Optical Upper Limit
  78. GRB 150716A: Swift/UVOT Upper Limits
  79. GRB 150716A: Swift detection of a burst
  80. Trigger 649113: Swift detection of SGR 1E 1841-045
  81. GRB 150710B: Swift-XRT and Swift-UVOT observations
  82. GRB 150711A: Swift/UVOT Upper Limits
  83. GRB 150711A: Swift detection of a burst
  84. GRB 150710A: Swift/UVOT Upper Limits
  85. GRB 150710A: RATIR Observations
  86. GRB 150626B: AMI 16 GHz detection of the radio counterpart
  87. GRB 150702A: MASTER-SAAO inspection
  88. GRB 150702A: Swift-XRT observations
  89. Swift Trigger 647642 is probably not an astrophysical source
  90. GRB 150627A: MASTER-SAAO OT Detection
  91. GRB 150626B: Swift/UVOT Upper Limits
  92. GRB 150626B: NOT optical upper limits
  93. GRB 150626B: MASTER observations
  94. GRB 150626B: Swift detection of a burst
  95. GRB 150626A: Swift/UVOT Upper Limits
  96. GRB 150626A: Swift detection of a burst
  97. V404 Cyg: MASTER Swift, Integral alert observations
  98. GRB 150622A: Swift-XRT observations
  99. GRB 150616A: Watcher optical upper limit
  100. GRB 150616A: Swift/UVOT Upper Limits

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