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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"

12390 results found.

  1. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  2. GRB 110406A: An exceptionally bright burst detected by INTEGRAL SPI-ACS
  3. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
  4. GRB 110402A: Swift/UVOT detection of afterglow candidate
  5. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  6. GRB 110402A: PAIRITEL NIR Upper Limits
  7. GRB 110402A: Swift detection of a burst
  8. GRB 110328/Swift J164449.3+573451: Fermi observations
  9. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  10. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  11. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  12. GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
  13. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  14. GRB 110328A: Swift detection of a burst
  15. GRB110318B : MOA optical upper limit
  16. GRB 110319B Swift-XRT afterglow confirmation
  17. GRB 110319B: Swift/UVOT Upper Limits
  18. GRB 110318B: Swift/UVOT Upper Limits
  19. GRB 110319B: GROND upper limits
  20. GRB 110319A: Swift/UVOT Detection
  21. GRB 110318B: GROND upper limits
  22. GRB 110319A: Swift detection of a burst
  23. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  24. GRB 110315A: Swift/UVOT Upper Limits
  25. GRB 110315A: MASTER early optical observations
  26. GRB 110315A: Swift detection of a burst
  27. GRB110312A: MITSuME Okayama Optical upper limits
  28. GRB 110312A: Swift/UVOT Upper Limits
  29. GRB 110312A: GROND Upper Limits
  30. GRB 110312A: Swift detection of a burst
  31. GRB110305A: MITSuME Ishigakijima Optical upper limits
  32. GRB 110305A: Swift/UVOT Upper Limits
  33. GRB 110223A: optical upper limits
  34. GRB101225A: early EVLA Observations of Christmas Burst
  35. Swift/UVOT observations of GRB110223A
  36. Swift/UVOT observations of GRB110223b
  37. GRB 110223A: Swift detection of a burst
  38. Swift XRT and UVOT Observations of OT 110215
  39. GRB 110210A: optical upper limit
  40. GRB 110210A: ROVOR Upper Limit
  41. GRB 110212A: Swift XRT and UVOT observations
  42. GRB 110205A: Konkoly optical observations
  43. GRB 110213A: Swift/UVOT refined analysis
  44. GRB 110213B: MAXI/GSC detection of a probable GRB
  45. GRB110212A: MITSuME Okayama optical upper limits
  46. GRB 110212A: GRT Optical Observation
  47. GRB 110210A: optical upper limit
  48. GRB 110210A: Swift detection of a burst
  49. Swift/UVOT observations of GRB110208a
  50. GRB 110207A: Swift-XRT observations
  51. GRB 110206A: SMARTS optical/IR afterglow candidate observations
  52. GRB 110206A: UVOT detection of afterglow candidate
  53. GRB 110207A: MASTER prompt and early optical observations
  54. GRB110205A: SMA 1.3mm Observations
  55. GRB110201A: MITSuME Okayama optical upper limits
  56. Swift/UVOT observations of GRB110201A
  57. GRB 110201A: MASTER optical observations
  58. GRB 110201A: Swift detection of a burst
  59. GRB110128A: MITSuME Okayama optical upper limits
  60. GRB 110128A: TAROT-Calern refined analysis
  61. GRB 110128A: TAROT Calern observatory upper limits
  62. GRB 110128A: Swift detection of a burst
  63. GRB 110120A: MASTER optical observations
  64. GRB 110112A: optical upper limit
  65. GRB 110120A: MASTER optical observations
  66. GRB110119: Swift/UVOT Detection
  67. GRB110119A: MITSuME Okayama optical upper limits
  68. GRB110106A, mm-radio observations
  69. Swift-BAT trigger 442771 is a noise fluctuation
  70. GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
  71. Swift-BAT Trigger 442539 is not a GRB
  72. Swift Trigger 442539 is probably not a GRB
  73. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  74. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  75. GRB 110107A: Swift-XRT afterglow confirmation
  76. GRB 110112A: Swift/UVOT upper limits
  77. GRB 110112A: MASTER optical observations
  78. GRB 110106B: MASTER optical observations
  79. GRB 110107A: Swift/UVOT upper limits
  80. GRB 110106B: MASTER early optical observations
  81. GRB 110106A: ISAS-Kanazawa optical upper limit
  82. GRB 110106A: MITSuME Okayama optical upper limits
  83. GRB 110106A: Swift/UVOT Upper Limits
  84. GRB110106B: Xinglong TNT upper limit
  85. GRB 110106A: MASTER optical observations
  86. GRB110106A: Xinglong TNT upper limit
  87. GRB 110106A: Swift detection of a burst
  88. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  89. GRB 101225A: Swift/UVOT Detection
  90. GRB 101225A (Swift trigger 441015): optical upper limit
  91. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  92. GRB 101224A: Swift/UVOT Upper Limits
  93. GRB 101224A: Swift-XRT refined Analysis
  94. GRB101224A: MITSuME Okayama optical upper limits
  95. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  96. GRB 101219A: Swift/UVOT Upper Limits
  97. GRB 101219A: GROND Upper limits
  98. GRB 101219A: Further Gemini-South Imaging
  99. GRB 101219A - NOT observation - upper limit
  100. GRB 101219A: SARA-N Upper Limit

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