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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"

28302 results found.

  1. GRB 130504A: IAC80 optical candidate
  2. GRB 130505A: Swift detection of a burst with optical afterglow
  3. GRB 130504A: MITSuME Okayama upper limits
  4. IPN Triangulation of GRB 130504B
  5. GRB 130504B: Fermi GBM detection
  6. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  7. GRB 130504A: Enhanced XRT position
  8. GRB 130502B: Suzaku WAM observation of the prompt emission
  9. GRB 130504A: Swift/UVOT Upper Limits
  10. GRB 130502B: Swift-XRT refined Analysis
  11. GRB 130504A, Swift-BAT refined analysis
  12. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  13. GRB 130502B: possible TNG counterpart
  14. Trigger 555096: Swift detection of a possible burst
  15. GRB 130502A: Swift-BAT refined analysis
  16. GRB 130427A: Non-observation of VHE emission with HAWC
  17. GRB 130502A: Swift-XRT refined Analysis
  18. IPN Triangulation of GRB 130502B
  19. GRB 130502A: Fermi GBM detection
  20. GRB 130502B: Swift/UVOT Upper Limits
  21. GRB 130502A: Swift/UVOT Upper Limits
  22. GRB 130502B: P60 Observations
  23. GRB 130502B Swift-XRT observations
  24. GRB 130502A: RATIR Optical and NIR Observations
  25. GRB 130427A: Pan-STARRS 1 optical observations
  26. GRB 130418A: TNG NIR observations
  27. GRB 130502A: Enhanced Swift-XRT position
  28. GRB 130427A: MITSuME Ishigakijima Optical Observation after 5 days
  29. GRB 130502A: TNG candidate counterpart
  30. GRB 130502B: Fermi GBM detection of a burst
  31. GRB 130502A: T100 Observations
  32. GRB 130502A: Swift detection of a burst
  33. GRB 130427A: KAIT optical observations
  34. GRB 130425A: Suzaku WAM observation of the prompt emission
  35. GRB 130427A: High-energy neutrino search
  36. GRB 130427A: high energy gamma-ray detection by AGILE
  37. GRB 130427A: Continued RATIR Optical and NIR Observations
  38. GRB 130427A: MITSuME Ishigakijima Optical Observation after 2 days
  39. GRB 130427A: Challis Observatory optical observations
  40. GRB 130427A: Continued Skynet/PROMPT Observations
  41. GRB 130427A: SARA-N detection
  42. GRB 130427A: Continued RATIR Optical and NIR Observations
  43. GRB 130427A: CrAO RT-22 36 GHz observation
  44. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  45. GRB 130427A in the Ep,i - Eiso plane
  46. GRB 130427A: Improved Swift-XRT analysis
  47. GRB 130425: MASTER-Net optical observations
  48. GRB 100728A: GROND host detection and X-shooter redshift
  49. GRB 130427B: MITSuME Ishigakijima upper limits
  50. GRB 130427A: MITSuME Okayama and Ishigakijima Optical Observation after 1 day
  51. GRB 130427A: Skynet/PROMPT Observations
  52. GRB 130427B: RATIR Optical and NIR Observations
  53. GRB 130427A: Nishi-Harima NIR Observations
  54. GRB 130427A : Xinglong TNT optical observation
  55. GRB 130427A optical time series
  56. GRB 130427A, Optical Observations
  57. Konus-Wind observation of GRB 130427A
  58. GRB 130427A: Swift-XRT refined Analysis
  59. GRB 130427A: SPI-ACS/INTEGRAL observations
  60. GRB 130427A: Continued RATIR Optical and NIR Observations
  61. GRB 130427A: CARMA 85 GHz detection
  62. GRB 130427A: VLA 5 GHz detection
  63. GRB 130427B: Swift-XRT refined Analysis
  64. GRB 130427A: NOT optical photometry and redshift
  65. GRB 130427B: MITSuME Okayama upper limits
  66. GRB 130427A: T100 observations
  67. GRB 130427A: optical observations in CrAO
  68. GRB 130427A: Fermi-LAT detection of a burst
  69. GRB 130427A: Swift-BAT refined analysis
  70. GRB 130427B: Swift-BAT refined analysis
  71. GRB 130427A: Zadko observatory - Gingin optical observations
  72. GRB 130427B: Enhanced Swift-XRT position
  73. GRB 130427A: GMG optical observation
  74. GRB 130427A: MITSuME Okayama Optical Observation
  75. GRB 130427A: Optical Observations
  76. GRB 130427B: Swift detection of a burst with optical counterpart
  77. GRB 130427A: RATIR Optical and NIR Observations
  78. GRB 130427A: Weihai optical observations
  79. GRB 130427A: Continued P60 follow-up of an extremely bright optical afterglow
  80. GRB 130427A: PAIRITEL NIR Detections
  81. GRB 130427A: early optical observations
  82. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  83. GRB 130420A: Continued Skynet/GORT Observations/Detections
  84. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  85. GRB 130425A: Fermi GBM detection
  86. GRB 130420A: Continued RATIR Optical and NIR Observations
  87. GRB 130420A: Continued RATIR Optical and NIR Observations
  88. GRB 130418A: Continued RATIR Optical and NIR Observations
  89. GRB 130420B: Fermi GBM observation
  90. Swift Trigger 554135 is probably not a GRB or transient
  91. GRB 130420B: RATIR Optical and NIR Observations
  92. GRB 130420A: Continued RATIR Optical and NIR Observations
  93. GRB 130420B: Swift-XRT refined Analysis
  94. GRB 130420A: Fermi GBM observation
  95. GRB 130420A: ISON-NM optical observations
  96. Skynet/GORT observations of GRB130420A
  97. GRB 130420B: Weihai optical upper limit
  98. GRB 130420B: Swift/UVOT Upper Limits
  99. GRB 130420A: Swift/UVOT Detection
  100. GRB130420B: GMG optical upper limit

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