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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20510 results found.

  1. GRB 131030A: Bassano Bresciano Observatory optical observations
  2. GRB 131031A: 1.23m CAHA afterglow candidate
  3. GRB 131031A: Swift-XRT observations
  4. GRB 131030A: P60 observations
  5. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  6. GRB 131030A: RATIR Optical and NIR Observations
  7. GRB 131030A: TAROT La Silla observatory optical observations
  8. GRB 131030A: T21 optical observations
  9. GRB 131030A: Swift/UVOT Detection
  10. GRB 131030A: SAO RAS optical observations
  11. GRB 131030A: 1.23m CAHA BVRI-band observations
  12. GRB 131029A: Nanshan optical observations
  13. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  14. GRB 131030A: Watcher OT detection
  15. GRB 131029A Tiled Swift observations
  16. GRB 131011A: ATCA 34GHz upper limit
  17. Swift 575905/GRB 131026A: optical observations
  18. GRB 131024B: MASTER prompt optical observation
  19. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  20. Swift Trigger 575905: KAIT Optical Upper Limit
  21. GRB 131026A: TAROT La Silla observatory optical observations
  22. GRB 131024B: RATIR Optical and NIR Observations
  23. GRB 131024B: Swift/UVOT Upper Limits
  24. GRB 131024A: Swift/UVOT Upper Limits
  25. GRB 131024A: GROND upper limits
  26. GRB 131024A: Skynet R-COP optical observations
  27. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  28. GRB 131018B: Swift/UVOT Upper Limits
  29. GRB 131018B: Swift-XRT observations
  30. GRB 131018A: RATIR Optical and NIR Observations
  31. GRB 131018A: Swift/UVOT Upper Limits
  32. GRB 131018A: KAIT Optical Upper Limit
  33. GRB 131018A: P60 Observations
  34. GRB131018A, optical observations
  35. GRB 131014A: GROND observations
  36. GRB 131011A: Swift/UVOT Upper Limits
  37. GRB 131014A: Swift/UVOT Upper Limits
  38. Fermi 403206457 / GRB 131011A: AAO optical observations
  39. GRB 131014A: RATIR Optical and NIR Observations
  40. GRB 131014A: Nanshan optical observations
  41. GRB 131014A: Swift detection of a possible X-ray afterglow
  42. GRB 131014A Tiled Swift observations
  43. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  44. GRB 131011A: GROND afterglow observations
  45. Fermi403206457: continued P60 observations and fading behavior
  46. Fermi403206457: NOT optical observations
  47. Fermi403206457: iPTF detection of a possible optical afterglow
  48. Trigger 574266 is not a Swift detection of a known source
  49. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  50. GRB 130831A: Continued RATIR Optical and NIR Observations
  51. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  52. GRB 131004A: CARMA 93 GHz upper limit
  53. GRB 131004A: Swift/UVOT Detection
  54. GRB 131004A: RATIR Optical and NIR Upper Limits
  55. GRB 131004A: GROND observations of the afterglow
  56. GRB131004A: Magellan Redshift
  57. GRB 131004A: Liverpool Telescope optical afterglow observations
  58. GRB 130925A: 3mm observations with CARMA
  59. GRB 130925A/Sw J0244-2609: mm observations at PdBI
  60. GRB 131002B: GROND upper limits
  61. GRB 131002B: Swift/UVOT Upper Limits
  62. GRB 131002A: Swift/UVOT Detection
  63. GRB 131002A: ISON-NM optical observations
  64. GRB 131001A: Swift UVOT and XRT Upper Limits
  65. NuSTAR observations of GRB 130925A
  66. GRB 131001A detected in ground analysis of Swift-BAT data
  67. GRB 130925A: continuing Swift/XRT monitoring
  68. IPN Observations of GRB 130925A
  69. GRB 130929A: Swift/UVOT Upper Limits
  70. GRB 130831A: Continued RATIR Optical and NIR Observations
  71. GRB 130929A: TAROT La Silla observatory optical observations
  72. GRB 130925A: Swift/UVOT Upper Limits
  73. GRB 130925A: sub-mm non-detection with SMA
  74. GRB 130925A: Continued RATIR Optical and NIR Observations
  75. GRB 130925A: RATIR Optical and NIR Observations
  76. GRB 130925A: Swift-XRT refined Analysis
  77. GRB 130925A: Initial Similarities to Swift J1644+57
  78. GRB 130925A: TAROT La Silla observatory optical observations
  79. GRB 130925A: VLT/X-shooter redshift
  80. GRB 130925A: VLT/UVES observations
  81. GRB 130831A: RTT150 optical observations
  82. GRB 130702A: RTT150 optical observations
  83. GRB 130903A: optical observations
  84. GRB 130907A: Maidanak optical observations
  85. Fermi Trigger 401326696: MASTER prompt optical observations
  86. GRB 130831A: Maidanak optical observations, possible emerging Supernova
  87. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  88. GRB 130903A: Further Swift XRT observations.
  89. GRB 130606A: Chandra observation
  90. GRB 130912A: Swift/UVOT Upper Limits
  91. GRB 130912A: 5.8 GHz VLA upper limit
  92. GRB 130912A: RATIR Optical and NIR Upper Limits
  93. GRB 130912A: WHT confirmation of optical counterpart
  94. GRB 130907A: Continued RATIR Optical and NIR Observations
  95. GRB 130912A: P60 Observations
  96. GRB 130907A: MASTER refined analysis
  97. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  98. GRB 130912A: REM optical/NIR upper limits
  99. GRB 130912A: GROND observations
  100. GRB 130912A: KAIT optical upper limit

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