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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"

21952 results found.

  1. GRB 141005A: RATIR Optical Observations
  2. GRB 141005A: P60 probable afterglow deteaction
  3. GRB 141004A: Enhanced Swift-XRT position
  4. GRB 141005A: Swift detection of a burst
  5. GRB 141004A: TNG photometric and spectroscopic observations
  6. GRB 141004A: 1.23m CAHA optical observations
  7. GRB 141004A: Swift detection of a burst with an optical counterpart
  8. Swift observations of HD 305560
  9. GRB 140928A: Swift-XRT follow-up observations
  10. Swift possible detection of the Be star HD 305560
  11. GRB 140930B: GROND observations
  12. GRB 140930A/MAXI J2259+524: MASTER optical observations
  13. GRB 140930B: Swift/UVOT Upper Limits
  14. Konus-Wind observation of GRB 140930B
  15. GRB 140930B: Enhanced Swift-XRT position
  16. GRB 140928A: MAXI-GSC detection
  17. GRB 140930B: ISON-Kislovodsk observations
  18. GRB 140930B: WHT detection of candidate afterglow
  19. GRB 140930B: 1.23m CAHA optical observations
  20. GRB 140930B: MASTER early optical observations
  21. GRB 140930B: Swift detection of a short burst
  22. GRB140928A: Gemini-South observation
  23. Konus-Wind observation of GRB 140928A
  24. IPN Triangulation of GRB 140928A
  25. GRB 140928A: LCO-Cerro Tololo observations
  26. GRB 140928A: GROND Afterglow Candidate
  27. GRB 140928A: Swift-XRT observations
  28. GRB 140928A: Fermi-LAT detection
  29. GRB 140927A: Swift-UVOT analysis
  30. GRB 140927A: Enhanced Swift-XRT position
  31. GRB 140927A: Swift detection of a burst
  32. GRB 140919A: Swift/UVOT Detection
  33. GRB 140919A: GROND afterglow candidate
  34. GRB 140919A: Enhanced Swift-XRT position
  35. GRB 140919A: Swift-XRT observations
  36. Swift detection of outburst from 4U 1700+24
  37. GRB 140916A: Swift/UVOT Upper Limits
  38. GRB 140916A: UKIRT J-band observations
  39. GRB 140916A: Enhanced Swift-XRT position
  40. GRB 140916A: MITSuME Okayama upper limits
  41. GRB 140916A: Swift detection of a burst
  42. GRB 140907A: Continued DCT Observations
  43. GRB 140909A: Confirmation of the Swift-XRT afterglow
  44. GRB 140907A: Mondy optical observations
  45. GRB 140909A: Swift/UVOT Upper Limits
  46. GRB 140909A: Swift-XRT observations
  47. GRB 140907A: TShAO observations
  48. Konus-Wind observation of GRB 140906C
  49. GRB 140907A: Nishi-Harima NIR Observations
  50. GRB 140907A: MITSuME Akeno Optical Observation
  51. IPN Triangulation of GRB 140906C (short/hard)
  52. GRB 140907A: T100 observations
  53. GRB 140907A: Enhanced Swift-XRT position
  54. GRB 140907A: MITSuME Ishigakijima Optical Observation
  55. GRB140907A: MITSuME Okayama Optical Observation
  56. GRB140907A: Swift UVOT detection
  57. GRB 140907A : Optical observations from Nanshan
  58. GRB 140907A: Swift detection of a burst with an optical counterpart
  59. GRB 140906A: iPTF optical transient candidates
  60. GRB 140903A: Possible optical variability
  61. GRB 140903A: NOT optical and NIR observations
  62. GRB 140818B: TShAO optical upper limit
  63. GRB 140903A: ISON-Kislovodsk observations
  64. GRB 140903A: MAXI/GSC upper limit
  65. GRB 140903A: Pan STARRS images of the field
  66. GRB 140903A: Swift/UVOT Upper Limits
  67. GRB 140903A: P60 Optical Observations
  68. GRB140903A: Discovery Channel Telescope Optical Detection
  69. GRB 140903A: Swift-XRT refined Analysis
  70. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  71. Konus-Wind observation of GRB 140825A
  72. IPN Triangulation of GRB 140825A (very intense/long)
  73. GRB 140818B: TLS observations
  74. GRB 140824A: optical upper limit in CrAO
  75. Fermi TRIGGER_NUM 430645968: MASTER OT inside error box
  76. Fermi TRIGGER_NUM 430583595: MASTER OT JR011101.13+603337.5 detection
  77. GRB 140824A: NOT optical upper limits
  78. GRB 140824A: OSN optical limit
  79. GRB 140824A: Enhanced Swift-XRT position
  80. GRB 140824A: MITSuME Ishigakijima upper limits
  81. GRB 140824A: Swift/UVOT Upper Limits
  82. GRB 140824A: Swift detection of a burst
  83. GRB 140817A: NOT optical observations
  84. GRB 140817A: Khureltogot optical upper limit
  85. GRB 140818B: ISON-Kislovodsk and ISON-Burakan optical upper limit
  86. Fermi trigger 430148973: Swift-XRT observation
  87. GRB 140818A: GROND confirmation of afterglow candidate
  88. GRB140819A: Deep GROND Upper Limits
  89. Fermi trigg_num 430148973: OSN I-band observations
  90. Fermi trigg_num 430148973: bright OT inside large error box!
  91. Konus-Wind observation of GRB 140818A
  92. GRB 140818B: Swift/UVOT Upper Limits
  93. GRB140818B : GROND afterglow candidate
  94. GRB 140818B: Enhanced Swift-XRT position
  95. GRB 140818B: OSN I-band afterglow candidate
  96. GRB 140817A: Swift/UVOT Afterglow Detection
  97. GRB 140818B: Swift detection of a burst
  98. Swift detection of SAX J1712.6-3739
  99. GRB 140818A: Swift-XRT and UVOT potential afterglow detection
  100. GRB 140817A: Enhanced Swift-XRT position

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