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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

20960 results found.

  1. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  2. Comparison of ICSP VLF observation of GRB 090424 with satellite observations
  3. GRB 110328A / Swift J164449.3+573451, HST Observations
  4. GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
  5. GRB 110402A: optical observations in Mondy
  6. GRB 110328A / Swift J164449.3+573451: Keck/DEIMOS Optical Spectroscopy
  7. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  8. GRB 110402A: Swift/UVOT detection of afterglow candidate
  9. GRB 110402A: Konkoly observations
  10. GRB 110328A: Konkoly observations.
  11. GRB 110402A: further NOT observations
  12. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  13. GRB 110402A: PAIRITEL NIR Upper Limits
  14. GRB 110402A: NOT afterglow confirmation
  15. GRB 110402A: Liverpool Telescope Observations
  16. GRB 110328A / Swift J164449.3+573451: KASINICS NIR Observation
  17. GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
  18. GRB 110328A / Swift J164449.3+573451: Infrared transient
  19. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  20. GRB 110328/Swift J164449.3+573451: Fermi observations
  21. GRB 110328A / Swift J164449.3+573451: KASINICS K-band Observation
  22. GRB 110328A / Swift J164449.3+573451: EVLA observations of a brightening radio source
  23. GRB 110328A / Swift J164449.3+573451: Gemini and UKIRT IR observations
  24. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  25. GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart
  26. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  27. GRB 110328A / Swift J164449.3+573451: CARMA mm detection
  28. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  29. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  30. GRB 110328A / Swift J164449.3+573451: optical observations
  31. GRB 110328A / Swift J164449.3+573451: EVLA Detection
  32. GRB 110328A / Swift J164449.3+573451: optical spectroscopy from GTC
  33. GRB 110328A: Gemini spectroscopic observations
  34. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  35. GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
  36. GRB 110328A / Swift J164449.3+573451: PTF Quiescent Optical Counterpart
  37. GRB / X-ray transient 110328A: Gemini optical observations
  38. GRB 110328A: a second trigger, probably a hard X-ray transient (Swift J164449.3+573451)
  39. GRB 110319B: Swift/UVOT Upper Limits
  40. GRB 110318B: Swift/UVOT Upper Limits
  41. GRB 110319A: Swift/UVOT Detection
  42. GRB 110315A: RTT150 optical observations
  43. GRB 110315A: Swift/UVOT Upper Limits
  44. GRB 110315A: MASTER early optical observations
  45. GRB 110312A: RTT150 optical observations
  46. GRB 110312A: Swift/UVOT Upper Limits
  47. GRB 110312A: GROND Upper Limits
  48. GRB 110305A: REM detection of a possible NIR afterglow
  49. GRB 110305A: Swift/UVOT Upper Limits
  50. GRB 110305A: GROND Detection of Optical Afterglow
  51. GRB101225A: early EVLA Observations of Christmas Burst
  52. Swift/UVOT observations of GRB110223A
  53. GRB GRB 110223A: MASTER VWF early optical observations
  54. Swift/UVOT observations of GRB110223b
  55. GRB 110223A: Liverpool Telescope observations
  56. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  57. GRB 110223A: Observations from BOOTES-2
  58. OT 110215: Further NIR observations from NOT of the GRB candidate
  59. GRB 110213B: Swift/UVOT observations
  60. Swift XRT and UVOT Observations of OT 110215
  61. OT 110215: NIR observations from NOT of GRB candidate
  62. GRB 110213A: optical observations in CrAO
  63. GRB 110213B: GROND observations of the optical/NIR afterglow
  64. GRB 110213A: optical observations in Mondy
  65. GRB110205A: EVLA Observations
  66. OT 110215: possible GRB from 2MASS J00264184+8324093
  67. Swift/UVOT observations of GRB110210a.
  68. GRB 110213B: Gemini South Redshift
  69. GRB 110210A: ROVOR Upper Limit
  70. GRB 110213A: YNAO-GMG Observations
  71. GRB 110213B: P60 Optical Afterglow Candidate
  72. GRB 110213A: TNT optical observations
  73. GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
  74. GRB 110212A: Swift XRT and UVOT observations
  75. Swift GRB110213A: interesting behaviour
  76. GRB 110205A: Konkoly optical observations
  77. GRB 110213A: Swift/UVOT refined analysis
  78. GRB 110213A: THO optical observations
  79. GRB 110213B: MAXI/GSC detection of a probable GRB
  80. GRB 110213A: Lightbuckets Optical Observations
  81. GRB 110213A: optical observations
  82. GRB 110213A: KAIT observations
  83. GRB 110213A: GRAS011 optical observations
  84. GRB 110213A: Bok Telescope Redshift
  85. GRB 110213A: ROTSE-III Detection of Optical Counterpart
  86. GRB 110213A: P60 Optical Afterglow Detection
  87. GRB 110201A: Subaru/MOIRCS Ks-band photometry
  88. GRB 110205A: detection of optical linear polarization from CAHA
  89. GRB 110210A: optical upper limit
  90. GRB 110201A: optical observations
  91. GRB 110208A: Magellan confirmation of the optical afterglow
  92. Swift/UVOT observations of GRB110208a
  93. GRB 110208A: Potential afterglow from Magellan
  94. GRB 110207A: Swift-XRT observations
  95. GRB 110208A: Magellan optical observations
  96. GRB 110206A: SMARTS optical/IR afterglow decay
  97. GRB 110205A: optical observations in Mondy observatory
  98. GRB 110205A : HCT optical observations
  99. GRB 110206A: SMARTS optical/IR afterglow candidate observations
  100. GRB 110207A: TAROT Calern observatory optical observations

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