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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"

12396 results found.

  1. GRB 160327A: KAIT optical afterglow confirmation
  2. GRB 160327A: Mondy optical upper limit
  3. GRB 160327A: Swift/UVOT Upper Limits
  4. GRB 160325A: GROND Upper Limits
  5. GRB 160325A: Further Swift/UVOT Observations
  6. GRB160325A Swift/UVOT Detection
  7. GRB 160325A: Swift detection of a burst
  8. Swift detects GX 301-2 in very high state
  9. GRB 160321A: Possible RATIR Optical and NIR Detections
  10. GRB 160321A: Swift/UVOT Upper Limits
  11. GRB 160131A: 15 GHz upper limits from AMI-LA
  12. GRB 160310A: A further Swift-XRT observation, no afterglow detected
  13. GRB 160314A: Continued RATIR Optical and NIR Observations
  14. GRB 160313A: Mondy optical upper limit
  15. GRB 160314A: GROND optical/NIR observations
  16. GRB 160314A: ISON-Ussuriysk optical upper limit, updated photometry and correction of GCN 19184
  17. GRB 160314A: RATIR Optical and NIR Observations
  18. GRB 160313A: Swift/UVOT Upper Limits
  19. GRB 160314A: Swift/UVOT Detection
  20. GRB 160314A: ISON-Ussuriysk optical upper limit
  21. GRB 160314A: Weihai optical upper limit
  22. GRB 160314A: Swift detection of a burst
  23. GRB 160313A: MASTER-Net optical observations
  24. GRB 160313A: RATIR Optical and NIR Observations
  25. GRB 160313A: Swift detection of a burst
  26. GRB 160310A: Swift/UVOT Upper Limits
  27. Konus-Wind observation of GRB 160310A (possible ultra-long GRB?)
  28. GRB 160310A: LCOGT-SAAO optical upper limits
  29. GRB 160310A: Swift-XRT observations
  30. GRB160303A: further GROND observations
  31. GRB 160303A: 9.8 GHz VLA upper limit
  32. GRB 160303A: Continued RATIR Optical and NIR Observations
  33. GRB 160303A: GROND Optical Detection
  34. GRB 160303A iTelescope observation
  35. Swift possibly triggered on IGR17091-3624
  36. GRB 160303A: Swift/UVOT Detection
  37. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  38. GRB 160303A: MITSuME Akeno optical upper limits
  39. GRB 160303A: MITSuME Okayama upper limits
  40. GRB 160303A: Swift detection of a burst, possibly short
  41. GRB 160228A: Swift/UVOT Upper Limits
  42. GRB 160227A: Swift/UVOT Detection
  43. GRB 160228A: RATIR Optical and NIR Observations
  44. GRB 160228A: MASTER-Amur prompt observations
  45. GRB 160227A: MASTER prompt OT Detection and LC
  46. GRB 160227A: AROMA-N Optical Observation
  47. GRB 160228A: GROND Afterglow Candidate
  48. GRB 160227A: MAXI/GSC detection
  49. GRB 160227A: MASTER OT Detection
  50. GRB 160225A: LOAO optical upper limit
  51. GRB 160225A: RATIR Optical and NIR Observations
  52. GRB 160225A: Swift/UVOT Upper Limits
  53. GRB 160225A: MITSuME Okayama Optical Observation
  54. GRB 160223A: RATIR Optical and NIR Observations
  55. GRB 160225A: TSHAO optical upper limit
  56. GRB 160225A: MASTER-Amur early observations
  57. GRB 160225A: Swift detection of a burst
  58. GRB 160223B: Swift-XRT observations
  59. GRB 160221A: GROND upper limits
  60. GRB 160221A: Swift-XRT observations
  61. GRB 160221A: MASTER-SAAO early observations
  62. Konus-Wind observation of GRB 160220B
  63. GRB160220B: Swift/UVOT observations
  64. GRB160220A: Swift/UVOT observations
  65. GRB 160220A: MASTER-Amur observations
  66. GRB 160220A: GROND Optical/NIR Upper Limits
  67. Konus-Wind observation of GRB 160216A (and GRB 160216B)
  68. GRB 160216A: Swift/UVOT Upper Limits
  69. GRB 160216A: Swift detection of a burst
  70. LIGO/Virgo G184098: MAXI/GSC search for an X-ray counterpart of GW150914
  71. GRB 160131A: second epoch observations with the GMRT
  72. Low frequency GMRT observations of GRB 160131A
  73. GRB 160203A: RATIR Upper Limits
  74. GRB 160203A: MITSuME Akeno optical upper limits
  75. Swift Trigger 672897 is probably not an astrophysical event
  76. GRB 160206A: Swift/UVOT observations
  77. GRB 160206A: Swift-XRT observations
  78. GRB 160206A: MAXI/GSC detection
  79. GRB 160203A: RATIR Optical Observations
  80. GRB 160131A: RATIR Optical Observations
  81. GRB 160203A: Swift/UVOT Detection
  82. GRB 160203A: Swift detection of a burst
  83. GRB 160131A Swift/UVOT Detection
  84. GRB160131.35 MASTER-Net OT detection
  85. GRB 160127A: RATIR Optical Observations
  86. GRB 160127A: MITSuME Akeno optical upper limits
  87. GRB 160127A: LCOGT-Sutherland optical upper limit
  88. GRB 160123A: GROND Upper limits
  89. GRB 160121A: RATIR Optical Observations
  90. GRB 160121A: TSHAO optical observation
  91. GRB 160123A: Swift/UVOT Upper Limits
  92. GRB 160123A: LCOGT-SSO optical upper limit
  93. GRB 160123A: Swift detection of a burst
  94. GRB 160121A: RATIR Optical Observations
  95. GRB 160121A: Swift/UVOT Upper Limits
  96. GRB 160121A: GROND Afterglow observations
  97. GRB 160121A: 1.8m MOA optical afterglow detection
  98. LIGO/VIRGO G184098: Summary of VLA results for iPTF15cyk
  99. GRB 160121A: MASTER-Amur observations
  100. GRB160119A: BOOTES-2/TELMA Early Upper Limits

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