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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"

19699 results found.

  1. GRB 120212A: Swift-XRT observations
  2. GRB 120211A: GROND Upper limits
  3. GRB 120212A: Swift detection of a burst
  4. GRB 120211A: MITSuME Okayama and Ishigakijima Optical upper limits
  5. GRB 120211A: Swift/UVOT Upper Limits
  6. GRB 120211A: MITSuME Okayama Ks-band upper limit
  7. GRB 120211A: Enhanced Swift-XRT position
  8. GRB 120211A: Swift detection of a burst
  9. GRB 120202A: D50 optical limits
  10. Swift detection of a burst from LS I +61 303
  11. GRB 120202A: GROND observations
  12. GRB 120202A: WHT, Gemini & UKIRT candidate afterglow
  13. GRB 120202A: Swift/XRT and UVOT observations
  14. GRB 120202A: TAROT Calern observatory optical observations
  15. GRB 120202A: A long GRB detected by INTEGRAL
  16. GRB 120127A / P48 Imaging
  17. GRB 120118B: optical upper limit
  18. GRB 120116A: optical upper limit
  19. GRB 120119A : SMA submm follow-up observation
  20. GRB 120119A: GRT detection of early afterglow
  21. GRB 111225A: optical observations
  22. GRB 120119A: optical upper limit
  23. GRB 120121A: Swift/UVOT Upper Limits
  24. GRB 120121A: Enhanced Swift-XRT position
  25. GRB 120121A: ISON-NM optical observations
  26. GRB 120121A: Swift detection of a burst
  27. GRB 120119A: TAROT La Silla observatory optical observations
  28. GRB120119A: REM NIR observations
  29. GRB 120119A: optical observations
  30. GRB 120119A: Swift/UVOT Observations
  31. GRB 120118B: RTT150 optical observations
  32. GRB 120119A: SMARTS optical/IR afterglow observations
  33. GRB 120119A: Enhanced Swift-XRT position
  34. GRB 120102A, the review of the sky area in plate archive
  35. GRB 120119A: optical observations
  36. GRB 120118B: TNG NIR observations
  37. GRB 120119A: Gemini-S redshift
  38. GRB 120119A: PROMPT optical observation of early afterglow
  39. GRB 120119A: GROND Detection of the Optical/NIR Afterglow
  40. GRB 120118B: Swift/UVOT Upper Limits
  41. GRB 120119A: PAIRITEL NIR Detection
  42. GRB 120119A: Swift detection of a burst with an optical counterpart
  43. GRB 120118B: NOT observations
  44. GRB 120118B: Enhanced Swift-XRT position
  45. XRF 120118A: early optical limit by "Pi of the Sky"
  46. GRB 120118B: Swift detection of a burst
  47. XRF 120118A: Optical candidate
  48. GRB 120116A: Swift/UVOT Upper Limits
  49. GRB 120116A: Enhanced Swift-XRT position
  50. AXP 4U 1042+61: Mondy optical observations
  51. GRB 120116A: Mondy optical observations
  52. GRB 120116A: WHT optical observations
  53. GRB 120116A: Optical observations at Crni Vrh
  54. GRB 120116A: NOT observations
  55. GRB 120116A: IAC80 I-band observations
  56. GRB 120116A: Bassano Bresciano Observatory optical observations
  57. GRB 120116A: Swift detection of a burst
  58. GRB 111228A: optical observations
  59. GRB 120106A: optical upper limit
  60. Swift detection of an SGR burst from AXP 4U 0142+61
  61. GRB 120106A: Swift/UVOT Upper Limits
  62. GRB 120106A: Bassano Bresciano Observatory optical observations
  63. GRB 120106A: MITSuME Okayama Ks-band upper limit
  64. GRB 120106A: Swift-XRT refined Analysis
  65. INTEGRAL Weak trigger #6433: GRT Optical Observation
  66. GRB 120106A: MITSuME Okayama Optical upper limits
  67. GRB 120106A: Enhanced Swift-XRT position
  68. GRB 120106A: TAROT Calern observatory optical observations
  69. GRB 120106A: Swift detection of a burst
  70. GRB 111222A: Second Swift observation
  71. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  72. GRB 111228A: optical observations in CrAO
  73. GRB 120102A: Swift/UVOT Detection
  74. GRB 120102A: Enhanced Swift-XRT position
  75. GRB 120102A: Swift detection of a burst with an optical counterpart
  76. GRB 111225A: optical observations in CrAO
  77. GRB 111229A: Swift/UVOT Detection
  78. GRB 111229A: Enhanced Swift-XRT position
  79. GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
  80. GRB 111229A: Gemini-South Redshift
  81. GRB 111229A: GROND afterglow candidate
  82. GRB 111229A: Swift detection of a burst
  83. GRB 111228A: Liverpool Telescope Observations
  84. GRB 111225A: Lightbuckets Optical Observations
  85. GRB 111228A: P60 Observations
  86. GRB 111228A: T100 observations
  87. GRB111228A: MITSuME Akeno photometry of the optical afterglow
  88. GRB 111228A: GMG optical observation
  89. GRB 111228A: Gemini South Redshift
  90. GRB 111228A: PAIRITEL NIR Detection
  91. GRB 111228A: TAROT La Silla observatory observations
  92. GRB 111228A: GROND observations
  93. GRB111228A: Errata of MITSuME Okayama about GRB name in GCNC 12743
  94. GRB 111228A: IAC80 BVI-band observations
  95. GRB 111228A: Swift/UVOT Detection
  96. GRB 111228A: Skynet/Dolomiti Optical Observations
  97. GRB 111228A: NOT optical observation
  98. GRB 111228A: optical observations
  99. GRB 111228A: Enhanced Swift-XRT position
  100. GRB 111228A: TAROT Calern observatory. OT decay stopped

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