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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"

42442 results found.

  1. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  2. GRB 110530A: Xinglong TNT observation
  3. GRB 110530A: Enhanced Swift-XRT position
  4. GRB 110530A: NOT optical observations
  5. GRB110530A: MITSuME Okayama Optical Observation
  6. GRB 110530A: optical observations at Mt. Terskol
  7. GRB 110530A: MASTER OT observations
  8. GRB 110530A: Swift-BAT refined analysis
  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. Konus-Wind observation of GRB 110529A
  13. LAT Observations of GRB110529A
  14. Swift J1644+57/GRB 110328A, Additional HST Observations
  15. GRB 110521A: MASTER prompt optical limit
  16. GRB 110521A: Swift/UVOT Upper Limits
  17. GRB 110521A: Swift-XRT refined analysis
  18. GRB 110520A: NOT optical follow-ups
  19. GRB 110521A - NOT optical observation
  20. GRB 110521A: Swift-BAT refined analysis
  21. GRB 110521A: Enhanced Swift-XRT position
  22. GRB 110521A: MASTER synchronous and early optical observations limit
  23. Swift/UVOT observations of GRB110520A
  24. GRB 110521A: Swift detection of a burst
  25. GRB 110520A: Swift-BAT refined analysis
  26. GRB 110520A: IAC80 I-band observations
  27. GRB 110520A: Swift-XRT refined Analysis
  28. GRB 110520A: Enhanced Swift-XRT position
  29. GRB 110520A: WHT IR observations
  30. GRB 110520A - NOT optical observation
  31. GRB 110520A: Skynet/DAO optical observations
  32. GRB 110520A: Liverpool Telescope Observations
  33. GRB 110520A: TAROT Calern observatory optical observations
  34. GRB 110520A: MASTER-NET optical observations
  35. GRB 110520A: Swift detection of a burst
  36. Radio observations of GRB 110428A with the EVLA
  37. GRB 110519A, Swift-BAT refined analysis
  38. GRB 110519A: Swift detection of a burst
  39. GRB 110503A optical observation
  40. GRB 110426A: Fermi GBM detection
  41. GRB 110428A: Fermi-GBM observation
  42. GRB 110503A: TAROT Calern observatory optical observations
  43. GRB 110503A: Jet Break seen from TLS
  44. GRB 110503A optical observations
  45. Konus-Wind observation of GRB 110503A
  46. GRB 110503A: optical observation in CrAO
  47. GRB 110503A: R-band Detection
  48. GRB 110503A: Centimeter observation from EVLA
  49. GRB 110503A: Millimeter observation from SMA
  50. GRB 110503A: SARA-N Observations and Photometric Calibration
  51. GRB 110503A: Swift/UVOT Observations
  52. GRB 110503A: Swift-XRT refined Analysis
  53. GRB 110503A: PAIRITEL NIR Detection
  54. GRB 110503A: redshift confirmation from TNG
  55. GRB 110503A - TLS Afterglow Observations
  56. GRB 110503A: Swift-BAT refined analysis
  57. GRB 110503A: NOT afterglow photometry
  58. GRB 110503A: Redshift from 10.4m GTC
  59. GRB 110503A: Enhanced Swift-XRT position
  60. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  61. GRB 110426A: Swift/XRT non-detection
  62. GRB 110428A : X-ray afterglow confirmation
  63. GRB 110428A: Suzaku WAM observation of the prompt emission
  64. GRB 110422A: optical observations in CrAO
  65. GRB 110422A: Update of Herschel FIR observation schedule
  66. GRB 110428A : Swift-XRT observations
  67. Konus-Wind observation of GRB 110428A
  68. GRB 110428A: Fermi-LAT Detection
  69. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  70. GRB 110426A: MAXI/GSC detection of a GRB
  71. GRB 110422A: optical observations in CrAO, second epoch
  72. GRB 110422A: Redshift confirmation from GTC
  73. GRB 110422A: tentative redshift from TNG
  74. GRB 110422A: Suzaku WAM observation of the prompt emission
  75. GRB110422A: NOT optical follow-ups
  76. GRB 110422A: optical observations in CrAO
  77. GRB110422A: MITSuME Ishigakijima Optical Observation
  78. Konus-Wind observation of GRB 110422A
  79. GRB 110422A: Further NOT observation
  80. GRB 110422A: Swift/UVOT Detection of optical afterglow
  81. GRB 110422A: Swift-XRT refined Analysis
  82. GRB 110422A: CQUEAN griz Observation
  83. GRB 110422A: THO optical observations
  84. GRB 110422A: Enhanced Swift-XRT position
  85. GRB 110422A: TNG optical observations
  86. GRB 110422A: SAO RAS optical observations
  87. GRB 110422A: NOT optical observation
  88. GRB 110422A: MASTER earlier OT polarization observations
  89. GRB 110422A: Swift-BAT refined analysis
  90. GRB 110422A: Mondy optical observations
  91. GRB 110422A: Swift detection of a burst
  92. GRB 110328A/Swift J164449.3+573451: Maidanak Optical Observation
  93. GRB 110420B: Swift/UVOT Upper Limits
  94. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  95. GRB 110420B: Swift-XRT afterglow candidate retraction
  96. GRB 110420B: Fermi GBM observation
  97. Konus-Wind observation of GRB 110420A
  98. GRB 110420B, GROND observations
  99. GRB 110420A Swift/UVOT Observations
  100. GRB 110420B: Swift-XRT afterglow candidate

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