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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"

28223 results found.

  1. GRB 110530A: optical observations at Mt. Terskol, second epoch
  2. GRB 110530A: Swift-XRT refined Analysis
  3. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  4. GRB 110530A: Xinglong TNT observation
  5. GRB 110530A: Enhanced Swift-XRT position
  6. GRB 110530A: NOT optical observations
  7. GRB110530A: MITSuME Okayama Optical Observation
  8. GRB 110530A: optical observations at Mt. Terskol
  9. GRB 110530A: MITSuME Akeno Optical Observation
  10. GRB 110529A: Fermi GBM detection
  11. GRB 110530A: Swift detection of a burst with an optical afterglow
  12. LAT Observations of GRB110529A
  13. EVLA afterglow limits on the high z GRB090429B
  14. Swift J1644+57/GRB 110328A, Additional HST Observations
  15. GRB 110521A: Swift/UVOT Upper Limits
  16. GRB 110521A: Swift-XRT refined analysis
  17. GRB 110520A: NOT optical follow-ups
  18. GRB 110521A - NOT optical observation
  19. GRB 110521A: Enhanced Swift-XRT position
  20. Swift/UVOT observations of GRB110520A
  21. GRB 110521A: Swift detection of a burst
  22. GRB 110520A: IAC80 I-band observations
  23. GRB 110520A: Swift-XRT refined Analysis
  24. GRB 110520A: Enhanced Swift-XRT position
  25. GRB 110520A: WHT IR observations
  26. GRB 110520A - NOT optical observation
  27. GRB 110520A: Skynet/DAO optical observations
  28. GRB 110520A: Liverpool Telescope Observations
  29. GRB 110520A: TAROT Calern observatory optical observations
  30. GRB 110520A: Swift detection of a burst
  31. GRB 110519A: Swift detection of a burst
  32. GRB 110503A optical observation
  33. GRB 110426A: Fermi GBM detection
  34. GRB 110428A: Fermi-GBM observation
  35. GRB 110503A: Jet Break seen from TLS
  36. GRB 110503A optical observations
  37. Konus-Wind observation of GRB 110503A
  38. GRB 110422A: Herschel FIR observation preliminary report
  39. GRB 110503A: optical observation in CrAO
  40. GRB 110503A: R-band Detection
  41. GRB 110503A: Millimeter observation from SMA
  42. GRB 110503A: SARA-N Observations and Photometric Calibration
  43. GRB 110503A: Swift/UVOT Observations
  44. GRB 110503A: Swift-XRT refined Analysis
  45. GRB 110503A: PAIRITEL NIR Detection
  46. GRB 110503A: redshift confirmation from TNG
  47. GRB 110503A - TLS Afterglow Observations
  48. GRB 110503A: NOT afterglow photometry
  49. GRB 110503A: Redshift from 10.4m GTC
  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 110422A: optical observations in CrAO
  55. GRB 110428A : Swift-XRT observations
  56. GRB 110428A: Fermi-LAT Detection
  57. GRB 110426A: MAXI/GSC detection of a GRB
  58. GRB 110422A: optical observations in CrAO, second epoch
  59. GRB 110422A: Redshift confirmation from GTC
  60. GRB 110422A: tentative redshift from TNG
  61. GRB110422A: NOT optical follow-ups
  62. GRB 110422A: optical observations in CrAO
  63. GRB110422A: MITSuME Ishigakijima Optical Observation
  64. GRB 110422A: Further NOT observation
  65. GRB 110422A: Swift/UVOT Detection of optical afterglow
  66. GRB 110422A: Swift-XRT refined Analysis
  67. GRB 110422A: CQUEAN griz Observation
  68. GRB 110422A: THO optical observations
  69. GRB 110422A: Enhanced Swift-XRT position
  70. GRB 110422A: TNG optical observations
  71. GRB 110422A: NOT optical observation
  72. GRB 110422A: Mondy optical observations
  73. GRB 110422A: Swift detection of a burst
  74. GRB 110420B: Swift/UVOT Upper Limits
  75. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  76. GRB 110420B: Swift-XRT afterglow candidate retraction
  77. GRB 110420B, GROND observations
  78. GRB 110420A Swift/UVOT Observations
  79. GRB 110420B: Swift-XRT afterglow candidate
  80. GRB 110420B: Swift detection of a short hard burst
  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/UVOT Upper limits
  88. GRB 110414A: Swift-XRT refined Analysis
  89. GRB 110414A: Enhanced Swift-XRT position
  90. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  91. GRB 110414A : Faulkes Telescope North observations
  92. GRB 110414A: Swift detection of a burst
  93. GRB 110411A: PAIRITEL NIR Upper Limits
  94. GRB 110411A: optical limits from OSN
  95. GRB 110411A: Swift-XRT refined Analysis
  96. GRB 110411A: Swift/UVOT Upper Limits
  97. GRB 110412A: Swift detection of a burst
  98. GRB 110411A: Enhanced Swift-XRT position
  99. GRB 110411A: Swift detection of a burst
  100. GRB 110407A: Swift-XRT refined Analysis

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