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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"

16149 results found.

  1. GRB 140906A: iPTF optical transient candidates
  2. GRB 140903A: Confirmation of Optical Fading from Discovery Channel Telescope
  3. GRB 140903A: Possible optical variability
  4. GRB 140903A: NOT optical and NIR observations
  5. GRB 140903A: FTN observations
  6. GRB 140818B: TShAO optical upper limit
  7. GRB 140903A: 6 GHz VLA detection
  8. GRB 140903A: Swift/UVOT Upper Limits
  9. GRB 140903A: P60 Optical Observations
  10. GRB140903A: Discovery Channel Telescope Optical Detection
  11. GRB 140903A: Coincident galaxy cluster in archival images
  12. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  13. GRB 140829A: Fermi GBM Detection
  14. GRB 140829A: iPTF optical observations
  15. IPN Triangulation of GRB 140824B
  16. GRB 140824A: optical upper limit in CrAO
  17. GRB 140824B: Swift observations
  18. GRB 140824A: NOT optical upper limits
  19. GRB 140824A: OSN optical limit
  20. GRB 140824A: MITSuME Ishigakijima upper limits
  21. GRB 140824A: Swift/UVOT Upper Limits
  22. GRB 140817A: NOT optical observations
  23. GRB 140817A: Khureltogot optical upper limit
  24. GRB 140818B: ISON-Kislovodsk and ISON-Burakan optical upper limit
  25. Fermi trigger 430148973: Swift-XRT observation
  26. GRB 140818A: GROND confirmation of afterglow candidate
  27. GRB 140808A/iPTF14eag: AMI 15 GHz detection
  28. GRB140819A: Deep GROND Upper Limits
  29. Fermi trigg_num 430148973: OSN I-band observations
  30. Fermi trigg_num 430148973: bright OT inside large error box!
  31. GRB 140818B: Swift/UVOT Upper Limits
  32. Radio upper limit on the GRB 140808A with the GMRT
  33. GRB 140818B: OSN I-band afterglow candidate
  34. GRB 140808A / PTFeag: VLA K-band observations
  35. GRB 140814A: MASTER optical follow-up inspection
  36. GRB 140808A / iPTF14eag optical follow-up at HCT
  37. GRB 140808A: Confirmation of the Swift-XRT afterglow
  38. GRB140809A: Fermi GBM observation
  39. GRB 140809A : Virtual Telescope optical observations
  40. GRB 140808A: Swift/UVOT Upper Limits
  41. GRB 140808A: Redshift from the 10.4m GTC telescope
  42. GRB 140808A: Swift-XRT observations
  43. GRB 140808A: optical afterglow candidate iPTF14eag
  44. GRB 140801A: AAO optical observations
  45. GRB 140801A: GROND Afterglow detection, unbroken decay
  46. GRB 140801A: BTA confirmation of redshift
  47. GRB 140801A: Swift/UVOT Upper Limits
  48. GRB 140801A: Swift-XRT observations
  49. GRB 140801A : Virtual Telescope optical observations
  50. GRB 140801A: Fermi GBM observation
  51. GRB 140801A: NOT afterglow confirmation
  52. IPN triangulation of GRB 140801A (Fermi trigger 428612396)
  53. GRB 140801A: archival upper limits on the host galaxy
  54. GRB 140709B: TShAO optical upper limit
  55. GRB 140730A: Swift/UVOT Upper Limits
  56. GRB 140729A: iPTF optical upper limit
  57. GRB 140723A: LCO-Sutherland optical candidate retraction
  58. GRB 140723A: MASTER optical observation
  59. GRB 140723A: LCO-Sutherland optical candidate
  60. GRB 140709B: Swift/UVOT Upper Limits
  61. GRB 140719A: Swift/UVOT Upper Limits
  62. GRB 140716A: GROND confirmation of the afterglow
  63. GRB 140719B: Zadko observatory - Gingin optical observations
  64. GRB 140716A: Swift/UVOT Upper Limits
  65. GRB 140713A: 10.4-m GTC deep optical observation
  66. GRB 140713A: Swift/UVOT Upper Limits
  67. GRB 140713A: NOT upper limits
  68. GRB 140713A : Xinglong TNT upper limit
  69. GRB 140713A: T100 observations
  70. GRB 140710A: iTelescope.Net T11 Optical Observation
  71. GRB 140709A: Continued RATIR Optical and NIR Observations
  72. GRB 140710A: Swift/UVOT Upper Limits
  73. GRB 140709B: update of Khureltogot optical upper limit
  74. GRB 140710A: RATIR Optical and NIR Observations
  75. GRB 140710A: P60 Confirmation of Afterglow
  76. GRB 140710A: GROND Detection of NIR Afterglow Candidate
  77. GRB 140709A: 10.4m GTC optical decay
  78. GRB 140709A : Virtual Telescope optical observations
  79. GRB 140709B: Khureltogot optical upper limit
  80. GRB 140709B: OSN optical limit
  81. GRB 140709A: BOOTES-2 and OSN optical observations
  82. GRB 140709B: MASTER optical observation
  83. GRB 140709A: Swift/UVOT Upper Limits
  84. GRB 140709A: RATIR Optical and NIR Observations
  85. GRB 140703A: Swift/UVOT Upper Limits
  86. GRB 140703A: AAO optical observations
  87. GRB140706A: GROND detection of the Optical/NIR afterglow
  88. GRB 140706A: Swift detection of a burst with an optical counterpart
  89. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  90. GRB 140705A: KAIT Optical Upper Limit
  91. GRB 140705A: MITSuME Ishigakijima upper limits
  92. GRB 140705A: MITSuME Okayama upper limits
  93. GRB 140705A: Swift/UVOT Upper Limits
  94. GRB 140629A: SAO RAS Rc band photometry
  95. GRB 140629A, Optical observations
  96. GRB 140703A: VLA K-band detection
  97. GRB 140703A: CARMA 3mm detection
  98. GRB 140703A: RATIR Optical and NIR Observations
  99. GRB 140703A: Monte Agliale Observatory optical observations
  100. Correction to GCN 16507: GRB 140703A!

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