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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"

37612 results found.

  1. GRB 151006A: Mondy optical upper limit
  2. GRB 151006A: MITSuME Akeno optical upper limits
  3. Fermi GBM trigger 466059859/151009211 is not a GRB
  4. Konus-Wind observation of GRB 151006A
  5. Swift Trigger 658045 is not a GRB
  6. GRB 151006A: OSN optical upper limit
  7. GRB 151006A: Swift-BAT refined analysis
  8. GRB 151006A: MITSuME Okayama Ks-band upper-limit
  9. GRB 151006A: Swift-XRT refined Analysis
  10. GRB 151006A: Fermi-LAT detection
  11. GRB 151006A: Swift/UVOT Upper Limits
  12. GRB 151006A: Fermi GBM detection
  13. GRB 151006A: Enhanced Swift-XRT position
  14. GRB 151006A: MITSuME Okayama upper limits
  15. Konus-Wind observation of GRB 151001B
  16. GRB 151006A: Kanata/HOWPol optical imaging polarimetry
  17. GRB 151006A: Prompt enhanced Swift-XRT position
  18. GRB 151006A: Swift detection of a burst
  19. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  20. Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
  21. Swift Trigger 657564: MASTER-NET early optical observations.
  22. Swift Trigger 657564: XRT prompt analysis
  23. Swift Trigger 657564: a probable GRB
  24. GRB 151001A: Swift-BAT refined analysis
  25. GRB 151001A: RATIR Observations
  26. GRB 151001B: Swift/UVOT Upper Limits
  27. GRB 151001B: Swift-XRT refined Analysis
  28. GRB 151001B: Swift-BAT refined analysis
  29. GRB 151001A: Swift/UVOT Detection
  30. GRB 151001B: MASTER-NET early optical observations.
  31. GRB 151001A: NOT imaging
  32. GRB 151001A: Swift-XRT refined Analysis
  33. GRB 151001B: Enhanced Swift-XRT position
  34. GRB 151001A: Enhanced Swift-XRT position
  35. GRB 151001A: Fermi GBM detection
  36. GRB 151001B: Swift detection of a burst
  37. GRB 151001A: Swift detection of a burst with an optical counterpart
  38. GRB 150925A: Swift/UVOT Upper Limits
  39. GRB 150925A: Swift-BAT refined analysis
  40. GRB 150925A: Swift-XRT refined Analysis
  41. GRB 150925A: Enhanced Swift-XRT position
  42. GRB 150925A: Swift detection of a burst
  43. Konus-Wind observation of GRB 150922A
  44. GRB 150922A: Fermi GBM observation
  45. IPN Triangulation of GRB 150922A (short/hard)
  46. Konus-Wind observation of GRB 150919A
  47. IPN Triangulation of GRB 150919A (short / hard)
  48. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  49. ANTARES neutrino detection: Fermi GBM Observations
  50. Fermi GBM trigger bn150920977 is not due to a GRB
  51. LIGO/Virgo G184098: DESGW followup program
  52. LIGO/Virgo G184098: DESGW followup program
  53. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  54. GRB 150915A: Swift-XRT refined Analysis
  55. GRB 150915A, Swift-BAT refined analysis
  56. GRB 150910A: AAO optical observations
  57. Konus-Wind observation of GRB 150911A
  58. GRB 000000: test of sernum on the original circular
  59. GRB 150915A: NOT observations of a brightening afterglow
  60. GRB 150915A: Swift UVOT upper limits
  61. GRB 150906B: Further analysis of the Konus-Wind data
  62. GRB 150910A: Mt. Terskol observatory optical observations
  63. GRB 150910A: TSHAO optical observations
  64. GRB 150915A: VLT/X-shooter redshift
  65. GRB 150915A: GROND detection of an optical counterpart candidate
  66. GRB 150915A: MASTER-NET optical observations
  67. GRB 150915A: Swift detection of a burst
  68. GRB 150910A: T100 observations
  69. GRB 150911A: GROND Upper Limits
  70. GRB 150910A: Continued RATIR Observations
  71. GRB 150907A: Swift-XRT afterglow detection
  72. GRB 150912A: Swift-XRT and UVOT observations
  73. GRB 150911A: Chuguev observatory upper limit
  74. GRB 150911A: Mt. Terskol observatory upper limit
  75. GRB 150911A: Khureltogot upper limit
  76. GRB 150910A: Mt. Terskol observatory optical observation
  77. Fermi GBM trigger 463890496/150914103 is not a GRB
  78. GRB 150912A: MITSuME Ishigakijima upper limits
  79. GRB 150911A: WHT optical imaging
  80. GRB 150910A: RATIR Observations
  81. GRB 150910A: MITSuME Ishigakijima Optical Observation after 2 days
  82. GRB 150912A: MASTER-IAC optical observations
  83. GRB 150912A: Fermi GBM observation
  84. GRB 150906B - NGC 3313 association: Constraints from Ep-Eiso and Ep-Liso Relations
  85. GRB 150912A: Swift ToO observations
  86. GRB 150906B: theoretical estimation of redshift and isotropic energy
  87. GRB150910A: P60 Observations
  88. GRB 150911A: Swift/UVOT Upper Limits
  89. GRB 150911A: Swift-BAT refined analysis
  90. GRB 150912A: A long GRB detected by INTEGRAL
  91. GRB 150911A: Swift-XRT refined Analysis
  92. GRB 150910A: AAO optical observations
  93. GRB 150910A: MITSuME Ishigakijima Optical Observation after 1 day
  94. GRB 150910A: Chuguev observatory optical observations
  95. GRB 150911A: MITSuME Okayama upper limits
  96. GRB 150910A: VLA Detection
  97. GRB 150910A: continued SAO RAS optical observations
  98. GRB 150911A: Enhanced Swift-XRT position
  99. GRB 150910A: TSHAO optical observations
  100. GRB 150911A: Swift detection of a burst

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