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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"

39369 results found.

  1. Swift J185003.2-005627: TAROT La Silla observatory optical observations
  2. Swift J185003.2-005627: TAROT Calern observatory optical observations
  3. Swift J185003.2-005627: Swift detection of a burst from a new Galactic transient
  4. GRB 110618A: SMARTS optical observations
  5. GRB 110604A: final update on Swift-XRT observations
  6. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  7. Konus-Wind observation of GRB 110618A
  8. IPN triangulation of GRB110618A (long duration, extremely intense)
  9. Fermi Gamma-ray Burst Monitor trigger 110621949 is not a GRB
  10. GRB 110604A: Suzaku WAM observation of the prompt emission
  11. GRB 110610A: Suzaku WAM observation of the prompt emission
  12. GRB 110610A: Fermi GBM detection
  13. GRB 110610A: 1.23m CAHA optical observations
  14. GRB 110610A: Swift-XRT refined Analysis
  15. GRB 110610A: Swift/UVOT Upper Limits
  16. GRB 110610A: Enhanced Swift-XRT position
  17. GRB 110610A: Swift-BAT refined analysis
  18. Swift detection of the X-ray afterglow of GRB 110604A
  19. GRB 110610A: MASTER-NET optical observations
  20. GRB 110610A: Swift detection of a burst
  21. Konus-Wind observation of GRB 110604A
  22. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  23. GRB 110530A: optical observations in Mondy observatory
  24. GRB 110529A: Suzaku WAM observation of the prompt emission
  25. GMRT detection of GRB 110328A
  26. GRB 110530A: optical observations at Mt. Terskol, second epoch
  27. GRB 110530A: Swift-XRT refined Analysis
  28. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  29. GRB 110530A: Xinglong TNT observation
  30. GRB 110530A: Enhanced Swift-XRT position
  31. GRB 110530A: NOT optical observations
  32. GRB110530A: MITSuME Okayama Optical Observation
  33. GRB 110530A: optical observations at Mt. Terskol
  34. GRB 110530A: Correction to GCN Circ 12050
  35. GRB 110530A: MASTER OT observations
  36. GRB 110530A: Swift-BAT refined analysis
  37. GRB 110530A: MITSuME Akeno Optical Observation
  38. GRB 110529A: Fermi GBM detection
  39. GRB 110530A: Swift detection of a burst with an optical afterglow
  40. Konus-Wind observation of GRB 110529A
  41. LAT Observations of GRB110529A
  42. EVLA afterglow limits on the high z GRB090429B
  43. Fermi Gamma-ray Burst Monitor trigger 328195911 is not a GRB
  44. Swift J1644+57/GRB 110328A, Additional HST Observations
  45. GRB 110521A: MASTER prompt optical limit
  46. GRB 110521A: Swift/UVOT Upper Limits
  47. GRB 110521A: Swift-XRT refined analysis
  48. GRB 110520A: NOT optical follow-ups
  49. GRB 110521A - NOT optical observation
  50. GRB 110521A: Swift-BAT refined analysis
  51. GRB 110521A: Enhanced Swift-XRT position
  52. GRB 110521A: MASTER synchronous and early optical observations limit
  53. Swift/UVOT observations of GRB110520A
  54. GRB 110521A: Swift detection of a burst
  55. GRB 110520A: Swift-BAT refined analysis
  56. GRB 110520A: IAC80 I-band observations
  57. GRB 110520A: Swift-XRT refined Analysis
  58. GRB 110520A: Enhanced Swift-XRT position
  59. GRB 110520A: WHT IR observations
  60. GRB 110520A - NOT optical observation
  61. GRB 110520A: Skynet/DAO optical observations
  62. GRB 110520A: Liverpool Telescope Observations
  63. GRB 110520A: TAROT Calern observatory optical observations
  64. GRB 110520A: MASTER-NET optical observations
  65. GRB 110520A: Swift detection of a burst
  66. Konus-Wind observation of GRB 110518A
  67. IPN localization of bright GRB 110518A
  68. Radio observations of GRB 110428A with the EVLA
  69. GRB 110519A, Swift-BAT refined analysis
  70. GRB 110519A: Swift detection of a burst
  71. GRB 110503A optical observation
  72. GRB 110426A: Fermi GBM detection
  73. GRB 110428A: Fermi-GBM observation
  74. GRB 110503A: TAROT Calern observatory optical observations
  75. GRB 110503A: Jet Break seen from TLS
  76. GRB 110503A optical observations
  77. Konus-Wind observation of GRB 110503A
  78. GRB 110422A: MASTER first 30 min OT light curve
  79. GRB 110422A: Herschel FIR observation preliminary report
  80. GRB 110503A: optical observation in CrAO
  81. GRB 110503A: R-band Detection
  82. GRB 110503A: Centimeter observation from EVLA
  83. GRB 110503A: Millimeter observation from SMA
  84. GRB 110503A: SARA-N Observations and Photometric Calibration
  85. GRB 110503A: Swift/UVOT Observations
  86. GRB 110503A: Swift-XRT refined Analysis
  87. GRB 110503A: PAIRITEL NIR Detection
  88. GRB 110503A: redshift confirmation from TNG
  89. GRB 110503A - TLS Afterglow Observations
  90. GRB 110503A: Swift-BAT refined analysis
  91. GRB 110503A: NOT afterglow photometry
  92. GRB 110503A: Redshift from 10.4m GTC
  93. GRB 110503A: Enhanced Swift-XRT position
  94. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  95. GRB 110426A: Swift/XRT non-detection
  96. GRB 110428A : X-ray afterglow confirmation
  97. GRB 110428A: Suzaku WAM observation of the prompt emission
  98. GRB 110422A: optical observations in CrAO
  99. GRB 110422A: Update of Herschel FIR observation schedule
  100. GRB 110428A : Swift-XRT observations

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