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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20510 results found.

  1. GRB 110503A: Millimeter observation from SMA
  2. GRB 110503A: SARA-N Observations and Photometric Calibration
  3. GRB 110503A: Swift/UVOT Observations
  4. GRB 110503A: PAIRITEL NIR Detection
  5. GRB 110503A - TLS Afterglow Observations
  6. GRB 110503A: NOT afterglow photometry
  7. GRB 110503A: Redshift from 10.4m GTC
  8. GRB 110428A : X-ray afterglow confirmation
  9. GRB 110422A: optical observations in CrAO
  10. GRB 110428A : Swift-XRT observations
  11. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  12. GRB 110426A: MAXI/GSC detection of a GRB
  13. GRB 110422A: optical observations in CrAO, second epoch
  14. GRB 110422A: Redshift confirmation from GTC
  15. GRB 110422A: tentative redshift from TNG
  16. GRB 110422A: Herschel observation scheduled
  17. GRB110422A: NOT optical follow-ups
  18. GRB 110422A: optical observations in CrAO
  19. GRB 110422A: Further NOT observation
  20. GRB 110422A: Swift/UVOT Detection of optical afterglow
  21. GRB 110422A: THO optical observations
  22. GRB 110422A: TNG optical observations
  23. GRB 110422A: SAO RAS optical observations
  24. GRB 110422A: MASTER earlier OT polarization observations
  25. GRB 110422A: Mondy optical observations
  26. GRB 110420B: Swift/UVOT Upper Limits
  27. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  28. GRB 110420B: Swift-XRT afterglow candidate retraction
  29. GRB 110420B, GROND observations
  30. GRB 110420A Swift/UVOT Observations
  31. GRB 110414A: GROND upper limits
  32. GRB 110414A: Swift/UVOT Upper limits
  33. GRB 110414A : Faulkes Telescope North observations
  34. GRB 110411A: PAIRITEL NIR Upper Limits
  35. GRB 110411A: optical limits from OSN
  36. GRB 110411A: Swift/UVOT Upper Limits
  37. GRB 110411A: MASTER optical observations
  38. GRB 110328A / Swift J164449.3+573451: R-band Monitoring
  39. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  40. GRB 110407A:VLF observations on 20.27kHz
  41. GRB 110328A / Swift J164449.3+573451: optical observations
  42. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  43. GRB 110407A: MASTER optical observations
  44. GRB110407A: UVOT Upper Limits
  45. GRB 110407A: GROND Detection of the Optical Afterglow
  46. GRB 110407A: NOT optical observations
  47. GRB 110407A : Lulin optical afterglow detection
  48. GRB 110407A: MASTER early optical observations
  49. GRB 110328/Swift J164449.3+573451: Chandra observations
  50. GRB 110402A: LOAO Optical Observation
  51. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  52. Comparison of ICSP VLF observation of GRB 090424 with satellite observations
  53. GRB 110328A / Swift J164449.3+573451, HST Observations
  54. GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
  55. GRB 110402A: optical observations in Mondy
  56. GRB 110328A / Swift J164449.3+573451: Keck/DEIMOS Optical Spectroscopy
  57. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  58. GRB 110402A: Swift/UVOT detection of afterglow candidate
  59. GRB 110402A: Konkoly observations
  60. GRB 110328A: Konkoly observations.
  61. GRB 110402A: further NOT observations
  62. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  63. GRB 110402A: PAIRITEL NIR Upper Limits
  64. GRB 110402A: NOT afterglow confirmation
  65. GRB 110402A: Liverpool Telescope Observations
  66. GRB 110328A / Swift J164449.3+573451: KASINICS NIR Observation
  67. GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
  68. GRB 110328A / Swift J164449.3+573451: Infrared transient
  69. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  70. GRB 110328/Swift J164449.3+573451: Fermi observations
  71. GRB 110328A / Swift J164449.3+573451: KASINICS K-band Observation
  72. GRB 110328A / Swift J164449.3+573451: EVLA observations of a brightening radio source
  73. GRB 110328A / Swift J164449.3+573451: Gemini and UKIRT IR observations
  74. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  75. GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart
  76. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  77. GRB 110328A / Swift J164449.3+573451: CARMA mm detection
  78. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  79. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  80. GRB 110328A / Swift J164449.3+573451: optical observations
  81. GRB 110328A / Swift J164449.3+573451: EVLA Detection
  82. GRB 110328A / Swift J164449.3+573451: optical spectroscopy from GTC
  83. GRB 110328A: Gemini spectroscopic observations
  84. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  85. GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
  86. GRB 110328A / Swift J164449.3+573451: PTF Quiescent Optical Counterpart
  87. GRB / X-ray transient 110328A: Gemini optical observations
  88. GRB 110328A: a second trigger, probably a hard X-ray transient (Swift J164449.3+573451)
  89. GRB 110319B: Swift/UVOT Upper Limits
  90. GRB 110318B: Swift/UVOT Upper Limits
  91. GRB 110319A: Swift/UVOT Detection
  92. GRB 110315A: RTT150 optical observations
  93. GRB 110315A: Swift/UVOT Upper Limits
  94. GRB 110315A: MASTER early optical observations
  95. GRB 110312A: RTT150 optical observations
  96. GRB 110312A: Swift/UVOT Upper Limits
  97. GRB 110312A: GROND Upper Limits
  98. GRB 110305A: REM detection of a possible NIR afterglow
  99. GRB 110305A: Swift/UVOT Upper Limits
  100. GRB 110305A: GROND Detection of Optical Afterglow

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