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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"

20395 results found.

  1. GRB 110610A: 1.23m CAHA optical observations
  2. GRB 110610A: Swift/UVOT Upper Limits
  3. GRB 110610A: Enhanced Swift-XRT position
  4. Swift detection of the X-ray afterglow of GRB 110604A
  5. GRB 110610A: Swift detection of a burst
  6. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  7. GMRT detection of GRB 110328A
  8. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  9. GRB 110530A: Enhanced Swift-XRT position
  10. GRB 110530A: NOT optical observations
  11. GRB110530A: MITSuME Okayama Optical Observation
  12. GRB 110530A: Swift detection of a burst with an optical afterglow
  13. LAT Observations of GRB110529A
  14. EVLA afterglow limits on the high z GRB090429B
  15. Swift J1644+57/GRB 110328A, Additional HST Observations
  16. GRB 110521A: MASTER prompt optical limit
  17. GRB 110521A: Swift/UVOT Upper Limits
  18. GRB 110520A: NOT optical follow-ups
  19. GRB 110521A - NOT optical observation
  20. GRB 110521A: Enhanced Swift-XRT position
  21. GRB 110521A: MASTER synchronous and early optical observations limit
  22. Swift/UVOT observations of GRB110520A
  23. GRB 110521A: Swift detection of a burst
  24. GRB 110520A: Swift-BAT refined analysis
  25. GRB 110520A: IAC80 I-band observations
  26. GRB 110520A: Enhanced Swift-XRT position
  27. GRB 110520A: WHT IR observations
  28. GRB 110520A - NOT optical observation
  29. GRB 110520A: TAROT Calern observatory optical observations
  30. GRB 110520A: Swift detection of a burst
  31. IPN localization of bright GRB 110518A
  32. GRB 110519A, Swift-BAT refined analysis
  33. GRB 110503A optical observation
  34. GRB 110503A: TAROT Calern observatory optical observations
  35. Konus-Wind observation of GRB 110503A
  36. GRB 110503A: optical observation in CrAO
  37. GRB 110503A: Centimeter observation from EVLA
  38. GRB 110503A: Millimeter observation from SMA
  39. GRB 110503A: SARA-N Observations and Photometric Calibration
  40. GRB 110503A: Swift/UVOT Observations
  41. GRB 110503A: PAIRITEL NIR Detection
  42. GRB 110503A: Swift-BAT refined analysis
  43. GRB 110503A: Enhanced Swift-XRT position
  44. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  45. GRB 110426A: Swift/XRT non-detection
  46. GRB 110428A : X-ray afterglow confirmation
  47. GRB 110428A: Suzaku WAM observation of the prompt emission
  48. GRB 110422A: optical observations in CrAO
  49. GRB 110428A : Swift-XRT observations
  50. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  51. GRB 110422A: optical observations in CrAO, second epoch
  52. GRB110422A: NOT optical follow-ups
  53. GRB 110422A: optical observations in CrAO
  54. GRB110422A: MITSuME Ishigakijima Optical Observation
  55. GRB 110422A: Further NOT observation
  56. GRB 110422A: Swift/UVOT Detection of optical afterglow
  57. GRB 110422A: Enhanced Swift-XRT position
  58. GRB 110422A: TNG optical observations
  59. GRB 110422A: SAO RAS optical observations
  60. GRB 110422A: NOT optical observation
  61. GRB 110422A: Mondy optical observations
  62. GRB 110422A: Swift detection of a burst
  63. GRB 110420B: Swift/UVOT Upper Limits
  64. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  65. GRB 110420B: Swift-XRT afterglow candidate retraction
  66. GRB 110420B: Spectral lag indicates short hard burst
  67. GRB 110420B, GROND observations
  68. GRB 110420A Swift/UVOT Observations
  69. GRB 110420A: Enhanced Swift-XRT position
  70. GRB 110420A: Swift detection of a burst with optical counterpart
  71. GRB110414A: MITSuME Ishigakijima Optical upper limits
  72. GRB 110414A: GROND upper limits
  73. GRB110414A: MITSuME Okayama Optical upper limits
  74. GRB 110414A: Swift/UVOT Upper limits
  75. GRB 110414A: Enhanced Swift-XRT position
  76. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  77. GRB 110414A : Faulkes Telescope North observations
  78. GRB 110414A: Swift detection of a burst
  79. GRB 110411A: PAIRITEL NIR Upper Limits
  80. GRB 110411A: Swift/UVOT Upper Limits
  81. GRB 110411A: Enhanced Swift-XRT position
  82. GRB 110411A: Swift detection of a burst
  83. GRB 110328A / Swift J164449.3+573451: R-band Monitoring
  84. GRB 110328A / Swift J164449.3+573451: optical observations
  85. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  86. GRB110407A: UVOT Upper Limits
  87. GRB 110407A: GROND Detection of the Optical Afterglow
  88. GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
  89. GRB 110407A: NOT optical observations
  90. GRB 110407A: Enhanced Swift-XRT position
  91. IPN triangulation of the bright GRB110406A
  92. GRB 110407A: Swift detection of a burst
  93. Konus-Wind observation of GRB 110406A
  94. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  95. GRB 110402A: fading optical afterglow
  96. GRB 110328/Swift J164449.3+573451: Chandra observations
  97. GRB 110328A / Swift J164449.3+573451, HST Observations
  98. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  99. GRB 110402A: optical observations in Mondy
  100. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits

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