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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"

19722 results found.

  1. GRB 130725B: Swift/UVOT Observations
  2. GRB 130725A: Swift-XRT refined Analysis
  3. GRB 130725B, Swift-BAT refined analysis
  4. GRB 130725B: Swift-XRT refined Analysis
  5. GRB130725B: REM-ROS2 optical observations
  6. GRB 130725B - UVOT-enhanced XRT position
  7. GRB 130725A: Swift/UVOT Upper Limits
  8. GRB 130725A - Faulkes Telescope South Observations
  9. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  10. GRB 130725A: MITSuME Ishigakijima Optical Observation
  11. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  12. GRB 130725A, Swift-BAT refined analysis
  13. GRB 130719A: Skynet/PROMPT observations
  14. Swift Trigger 563980 is GRB 130725A
  15. GRB 130722A: Swift/UVOT Detection
  16. GRB 130722A: MITSuME Okayama upper limits
  17. GRB 130722A: Enhanced Swift-XRT position
  18. GRB 130722A: Skynet/GORT observations
  19. GRB 130722A: Swift detection of a burst
  20. GRB 130716A: Gemini-North imaging
  21. GRB 130716A: UVOT Upper Limits
  22. GRB 130716A: Probable short-hard burst with delayed Swift data
  23. GRB 130626A: Retraction of possible X-ray afterglow
  24. GRB 130708A: Swift XRT and UVOT Observations
  25. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  26. GRB 130708A: Fermi GBM observation
  27. GRB 130702A: P200 Spectroscopic Confirmation of Associated Supernova
  28. GRB130702A: NOT observation - the detection of an emerging supernova
  29. GRB 130702A: Continued RATIR Optical and NIR Observations
  30. GRB 130702A: Continued UVOT Observations
  31. GRB 130702Ð
  32. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  33. GRB 130702A: RATIR Optical and NIR Observations
  34. GRB 130702A: NOT optical observations
  35. GRB 130702A / Fermi394416326 : Nanshan optical observations
  36. Fermi GRB 130702A: Swift XRT and UVOT observations
  37. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  38. Fermi GBM trigger 394416326: MASTER early optical limit
  39. Fermi394416326: FTN detection
  40. Fermi394416326: iPTF detection of a possible optical afterglow
  41. GRB 130623A: Second Swift-XRT observation
  42. GRB 130701A: MITSuME Akeno Optical observation
  43. GRB 130701A: Swift/UVOT Detection
  44. GRB 130701A: Enhanced Swift-XRT position
  45. GRB 130701A: optical afterglow from the NOT
  46. GRB 130701A: Swift detection of a burst
  47. GRB 130627B: Swift/UVOT Upper Limits
  48. GRB 130627A: Swift/UVOT Upper Limits
  49. Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
  50. GRB 130627A: Enhanced Swift-XRT position
  51. GRB 130626A: RATIR Optical Observations
  52. GRB130627B: Swift/UVOT Observations
  53. GRB 130627B: Swift-XRT observations
  54. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  55. GRB 130627A: Swift-XRT observations
  56. GRB 130627A: Swift/UVOT Observation
  57. GRB 130626A: Swift detection of a short burst
  58. GRB 130625A: Swift/UVOT Upper Limits
  59. GRB 130625A: Nanshan optical upper limit
  60. GRB 130623A: Swift-XRT and UVOT observations
  61. GRB 130625A: Enhanced Swift-XRT position
  62. GRB 130625A: Swift detection of a burst
  63. GRB 130603B: First epoch of XMM-Newton observations
  64. Swift Trigger 558631 is not a real source
  65. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  66. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  67. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  68. GRB 130615A: Continued Skynet/PROMPT Observations
  69. GRB 130610A: TAROT La Silla observatory optical observations
  70. GRB 130610A: CrAO optical observations
  71. GRB 130615A: Zadko observatory - Gingin optical observations
  72. GRB 130615A: TAROT La Silla observatory optical observations
  73. GRB 130615A: Swift/UVOT Upper Limits
  74. GRB 130615A: Skynet/PROMPT Observations
  75. GRB 130615A: Enhanced Swift-XRT position
  76. GRB 130615A: GROND afterglow candidate
  77. GRB 130615A: Swift detection of a burst
  78. GRB 130612A: ISON-NM optical observations
  79. GRB 130612A: MITSuME Okayama upper limits
  80. GRB 130612A: Swift/UVOT Detection
  81. GRB 130612A: Zadko observatory - Gingin optical observations
  82. GRB 130612A: Enhanced Swift-XRT position
  83. GRB 130612A: TAROT La Silla observatory optical observations
  84. GRB130612A OSN I-band observations
  85. GRB 130612A: RATIR Optical Observations
  86. GRB 130612A: P60 Observations
  87. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  88. GRB 130612A: PAIRITEL NIR Afterglow Observations
  89. GRB 130612A: Swift detection of a burst with an optical counterpart
  90. GRB 130609A: Swift/UVOT Upper Limits
  91. GRB 130608A: Swift/UVOT Upper Limits
  92. GRB 130609B: GROND observations
  93. GRB 130606A: CrAO optical upper limit
  94. GRB 130608A: ISON-Kislovodsk optical upper limit
  95. GRB 130610A: ISON-NM optical observations
  96. GRB 130610A: Swift/UVOT Observations
  97. GRB 130609B: Swift/UVOT Observations
  98. GRB 130606B: Swift/UVOT Upper Limit
  99. GRB 130610A: LOAO BVR Observation
  100. GRB 130610A: Enhanced Swift-XRT position

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