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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"

28291 results found.

  1. Swift detection of the X-ray afterglow of GRB 110604A
  2. GRB 110610A: Swift detection of a burst
  3. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  4. GRB 110529A: Suzaku WAM observation of the prompt emission
  5. GMRT detection of GRB 110328A
  6. GRB 110530A: Swift-XRT refined Analysis
  7. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  8. GRB 110530A: Enhanced Swift-XRT position
  9. GRB 110530A: NOT optical observations
  10. GRB110530A: MITSuME Okayama Optical Observation
  11. GRB 110530A: Swift-BAT refined analysis
  12. GRB 110529A: Fermi GBM detection
  13. GRB 110530A: Swift detection of a burst with an optical afterglow
  14. LAT Observations of GRB110529A
  15. EVLA afterglow limits on the high z GRB090429B
  16. Swift J1644+57/GRB 110328A, Additional HST Observations
  17. GRB 110521A: MASTER prompt optical limit
  18. GRB 110521A: Swift/UVOT Upper Limits
  19. GRB 110521A: Swift-XRT refined analysis
  20. GRB 110520A: NOT optical follow-ups
  21. GRB 110521A - NOT optical observation
  22. GRB 110521A: Swift-BAT refined analysis
  23. GRB 110521A: Enhanced Swift-XRT position
  24. GRB 110521A: MASTER synchronous and early optical observations limit
  25. Swift/UVOT observations of GRB110520A
  26. GRB 110521A: Swift detection of a burst
  27. GRB 110520A: Swift-BAT refined analysis
  28. GRB 110520A: IAC80 I-band observations
  29. GRB 110520A: Swift-XRT refined Analysis
  30. GRB 110520A: Enhanced Swift-XRT position
  31. GRB 110520A: WHT IR observations
  32. GRB 110520A - NOT optical observation
  33. GRB 110520A: TAROT Calern observatory optical observations
  34. GRB 110520A: Swift detection of a burst
  35. IPN localization of bright GRB 110518A
  36. GRB 110519A, Swift-BAT refined analysis
  37. GRB 110519A: Swift detection of a burst
  38. GRB 110426A: Fermi GBM detection
  39. GRB 110428A: Fermi-GBM observation
  40. GRB 110503A: TAROT Calern observatory optical observations
  41. Konus-Wind observation of GRB 110503A
  42. GRB 110503A: optical observation in CrAO
  43. GRB 110503A: Centimeter observation from EVLA
  44. GRB 110503A: Millimeter observation from SMA
  45. GRB 110503A: SARA-N Observations and Photometric Calibration
  46. GRB 110503A: Swift/UVOT Observations
  47. GRB 110503A: Swift-XRT refined Analysis
  48. GRB 110503A: PAIRITEL NIR Detection
  49. GRB 110503A: Swift-BAT refined analysis
  50. GRB 110503A: Enhanced Swift-XRT position
  51. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  52. GRB 110426A: Swift/XRT non-detection
  53. GRB 110428A : X-ray afterglow confirmation
  54. GRB 110428A: Suzaku WAM observation of the prompt emission
  55. GRB 110422A: optical observations in CrAO
  56. GRB 110428A : Swift-XRT observations
  57. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  58. GRB 110422A: optical observations in CrAO, second epoch
  59. GRB 110422A: Suzaku WAM observation of the prompt emission
  60. GRB110422A: NOT optical follow-ups
  61. GRB 110422A: optical observations in CrAO
  62. GRB110422A: MITSuME Ishigakijima Optical Observation
  63. GRB 110422A: Further NOT observation
  64. GRB 110422A: Swift/UVOT Detection of optical afterglow
  65. GRB 110422A: Swift-XRT refined Analysis
  66. GRB 110422A: Enhanced Swift-XRT position
  67. GRB 110422A: TNG optical observations
  68. GRB 110422A: SAO RAS optical observations
  69. GRB 110422A: NOT optical observation
  70. GRB 110422A: Swift-BAT refined analysis
  71. GRB 110422A: Mondy optical observations
  72. GRB 110422A: Swift detection of a burst
  73. GRB 110420B: Swift/UVOT Upper Limits
  74. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  75. GRB 110420B: Swift-XRT afterglow candidate retraction
  76. GRB 110420B, GROND observations
  77. GRB 110420A Swift/UVOT Observations
  78. GRB 110420B: Swift-XRT afterglow candidate
  79. GRB 110420B: Swift-BAT refined analysis
  80. GRB 110420A: Swift-BAT refined analysis
  81. GRB 110420A: Swift-XRT refined Analysis
  82. GRB 110420A: Enhanced Swift-XRT position
  83. GRB 110420A: Swift detection of a burst with optical counterpart
  84. GRB110414A: MITSuME Ishigakijima Optical upper limits
  85. GRB 110414A: GROND upper limits
  86. GRB110414A: MITSuME Okayama Optical upper limits
  87. GRB 110414A: Swift-BAT Refined Analysis
  88. GRB 110414A: Swift/UVOT Upper limits
  89. GRB 110414A: Swift-XRT refined Analysis
  90. GRB 110414A: Enhanced Swift-XRT position
  91. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  92. GRB 110414A : Faulkes Telescope North observations
  93. GRB 110414A: Swift detection of a burst
  94. GRB 110411A: PAIRITEL NIR Upper Limits
  95. GRB 110412A: Swift-BAT refined analysis
  96. GRB 110411A: Swift-XRT refined Analysis
  97. GRB 110411A: Swift/UVOT Upper Limits
  98. GRB 110411A : Xinglong TNT OT candidate
  99. GRB 110411A, Swift-BAT refined analysis
  100. GRB 110411A: Enhanced Swift-XRT position

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