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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"

12335 results found.

  1. GRB 120211A: GROND Upper limits
  2. GRB 120211A: MITSuME Okayama and Ishigakijima Optical upper limits
  3. GRB 120211A: Swift/UVOT Upper Limits
  4. GRB 120211A: MASTER early optical observations
  5. GRB 120211A: MITSuME Okayama Ks-band upper limit
  6. GRB 120211A: Swift detection of a burst
  7. GRB 120202A: MASTER early optical observations
  8. GRB 120202A: D50 optical limits
  9. GRB 120202A: Swift/XRT and UVOT observations
  10. GRB 120129A: MASTER optical observations
  11. GRB 120118B: optical upper limit
  12. GRB 120116A: optical upper limit
  13. GRB 120119A: EVLA observations
  14. GRB 120119A: GRT detection of early afterglow
  15. GRB 111225A: optical observations
  16. GRB 120119A: optical upper limit
  17. GRB 120121A: Swift/UVOT Upper Limits
  18. GRB 120121A: Swift detection of a burst
  19. GRB 120119A: Swift/UVOT Observations
  20. GRB 120118B: Swift/UVOT Upper Limits
  21. GRB 120118B: MASTER optical observations
  22. GRB 120118B: Swift detection of a burst
  23. GRB 120116A: Swift/UVOT Upper Limits
  24. GRB 120116A: MASTER Early optical limit
  25. GRB 120116A: Swift detection of a burst
  26. GRB 120106A: optical upper limit
  27. Swift detection of an SGR burst from AXP 4U 0142+61
  28. GRB 120106A: MITSuME Okayama Optical Observation (update)
  29. GRB 120106A: Swift/UVOT Upper Limits
  30. GRB 120106A: MITSuME Okayama Ks-band upper limit
  31. INTEGRAL Weak trigger #6433: GRT Optical Observation
  32. GRB 120106A: MITSuME Okayama Optical upper limits
  33. GRB 120106A: MASTER-Tunka optical observations
  34. GRB 120106A: Swift detection of a burst
  35. GRB 111222A: Second Swift observation
  36. Konus-Wind observation of GRB 120102A
  37. GRB 120102A: Swift/UVOT Detection
  38. GRB 111229A: Swift/UVOT Detection
  39. GRB 111225A: Lightbuckets Optical Observations
  40. FERMI GRB111228.45: MASTER observations
  41. GRB 111228A: Swift/UVOT Detection
  42. GRB 111225A, optical observations
  43. GRB 111225A: Swift/UVOT Observations
  44. GRB 111225A: PAIRITEL NIR Upper Limits
  45. GRB111225A: MITSuME Okayama optical upper limits
  46. GRB 111225A: GRT Optical Observation
  47. GRB 111210A: optical upper limit of Mt. Terskol observatory
  48. Trigger 510075 is not a GRB
  49. GRB 111103B: optical upper limit
  50. GRB 110820A: optical observations in Maidanak observatory
  51. GRB 111103A: optical upper limit of Mt. Terskol observatory
  52. GRB111215A: optical upper limit
  53. GRB 111215B: Swift/UVOT Upper Limits
  54. GRB 111215A: MITSuME Okayama Optical upper limits
  55. GRB 111215A: Swift/UVOT Upper Limits
  56. GRB 111215A: MASTER-Net optical prompt and follow up observations
  57. GRB 111215A: MITSuME Akeno Optical upper limits
  58. GRB 111215A: GMG optical upper limit
  59. GRB 111215A : Xinglong TNT upper limit
  60. GRB 111215A: Swift detection of a burst
  61. GRB 111212A: Swift/UVOT Upper Limits
  62. GRB 111210A: Xinglong TNT upper limit
  63. GRB 111209A - ATCA 34GHz upper limit
  64. GRB 111210A: GROND observations
  65. GRB 111210A: MITSuME Okayama Optical upper limits
  66. GRB111210A: MITSuME Okayama J-band upper-limit
  67. GRB 111210A: Swift/UVOT Upper Limits
  68. GRB 111210A: Swift detection of a burst
  69. GRB 111208A: Lightbuckets Optical Observations
  70. GRB 111208A: Swift XRT/UVOT observations
  71. Konus-Wind observation of GRB 111205A
  72. GRB 111204A: GROND Observations
  73. GRB 111204A: Swift/UVOT Upper Limits
  74. GRB 110921A: optical observations in Maidanak observatory
  75. GRB 111204A: MASTER optical observations
  76. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  77. GRB 111123A: optical upper limit in CrAO
  78. GRB 111204A: Swift detection of a burst
  79. GRB 111201A: Swift/UVOT Upper Limits
  80. GRB 111129A: Swift/UVOT Detection
  81. GRB 111123A: Swift/UVOT Upper Limits
  82. GRB 111123A, GROND observations
  83. GRB 111123A: correction to GCN 12593
  84. GRB 111123A: TNG NIR detection of the afterglow candidate
  85. GRB 111123A: MITSuME Okayama Optical upper limits
  86. GRB 111123A: Swift detection of a burst
  87. GRB 111121A: Swift/UVOT Upper Limits
  88. GRB 111117A: optical upper limit in CrAO
  89. GRB 111117A: Swift/UVOT Upper Limits
  90. GRB 111117A: GMG upper limit
  91. GRB 111117A: Swift detection of a short hard burst
  92. GRB111107A: ATCA observations - upper limit and a possible detection
  93. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  94. GRB 111103B: optical upper limit of CrAO
  95. GRB 111103B: optical upper limit of Mt. Terskol observatory
  96. GRB 111107A: Swift/UVOT Afterglow Analysis
  97. GRB 111103B: MITSuME Akeno Optical upper limits
  98. GRB111103B Swift/UVOT Upper Limits
  99. GRB 111022B: MASTER OT observations
  100. GRB 111103B: optical observations

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