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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"

28233 results found.

  1. GRB 120324A: CQUEAN rizY Observation
  2. GRB 120324A: Swift/UVOT Upper Limits
  3. GRB 120324A: TAROT La Silla observatory optical observations
  4. GRB 120324A: Enhanced Swift-XRT position
  5. GRB 120324A: Liverpool Telescope optical candidate
  6. GRB 120324A: UVOT Finding Chart Observation
  7. GRB 120324A: Swift detection of a burst
  8. GRB 120316A : Suzaku WAM observation of the prompt emission
  9. GRB 120320A: Zadko optical observations
  10. GRB 120229A: Magellan observations and limit on an optical afterglow
  11. GRB 120320A: Swift/UVOT Upper Limits
  12. GRB 120320A: MITSuME Okayama Optical upper limits
  13. GRB 120320A , optical observations
  14. GRB 120320A: Swift-XRT refined Analysis
  15. GRB 120320A: Gemini-N and UKIRT observations
  16. GRB 120320A: Enhanced Swift-XRT position
  17. Konus-Wind observation of GRB 120316A
  18. GRB 120320A: Swift detection of a burst
  19. GRB 111228A: possible detection of the SN with the TNG
  20. Trigger 517876 is a Swift detection of GX 5-1
  21. GRB 120302A: Swift XRT refined analysis
  22. GRB 120312A: CrAO optical upper limit
  23. GRB 120312A: Gemini and UKIRT imaging
  24. GRB 120311A: Optical follow-up
  25. GRB 120311B: Optical follow-up
  26. GRB 120311A: C88 optical limits
  27. GRB 120312A: Swift/UVOT Upper Limits
  28. GRB 120312A: WHT candidate afterglow
  29. GRB 120312A: NOT observations
  30. GRB 120312A: Swift-XRT refined Analysis
  31. GRB 120311A: VLT/X-shooter observations
  32. GRB 120311B: C88 optical limits
  33. GRB 120312A: Swift detection of a burst
  34. GROND observations of GRB 120311A
  35. GRB 120311B: Swift/UVOT Upper Limits
  36. GRB 120311B: MITSuME Okayama Optical upper limits
  37. GRB 120311B: Faulkes Telescope North observations
  38. GRB 120311B: Swift-XRT refined Analysis
  39. GRB 120311A: Swift-XRT refined Analysis
  40. GRB 120311B: Enhanced Swift-XRT position
  41. GRB 120311B: Swift-XRT observations
  42. GRB 120311B: Swift detection of a burst
  43. GRB 120311A: Swift/UVOT Upper Limits
  44. GRB 120311A: CAHA 1.23m I-band early observations
  45. GRB 120311A: Enhanced Swift-XRT position
  46. GRB 120311A: Swift-XRT observations
  47. GRB 120311A: Liverpool Telescope optical candidate
  48. GRB 120311A: Swift detection of a burst
  49. GRB 120308A : LOAO optical observation
  50. GRB 120302A: RTT150 optical observations
  51. GRB 120308A: 1.23m CAHA I-band observations
  52. GRB120308A: MITSuME Ishigakijima Optical Upper Limits
  53. GRB 120308A: Swift/UVOT Detection
  54. GRB 120308A: Swift-XRT refined Analysis
  55. GRB 120308A: Enhanced Swift-XRT position
  56. GRB 120308A: IAC80 I-band observations
  57. GRB 120308A: PAIRITEL NIR observations
  58. GRB 120308A: confirmation of the optical afterglow
  59. GRB 120308A: Liverpool Telescope optical afterglow candidate
  60. GRB 120308A: Swift detection of a burst
  61. GRB 120302A: Swift-BAT refined position and a possible XRT and UVOT counterpart
  62. GRB 120305A: Swift/UVOT Upper Limits
  63. GRB 120305A: EVLA deep limit on a radio counterpart
  64. GRB 120305A: Swift-XRT refined Analysis
  65. GRB 120305A: Enhanced Swift-XRT position
  66. GRB 120305A - Liverpool Telescope Observations
  67. GRB 120305A: Swift detection of a short burst
  68. GRB 120302A: GROND detection of an afterglow candidate
  69. GRB 111222A: Swift observation on 2012 February 06/07
  70. GRB 120229A: Swift detection of a short burst
  71. Konus-Wind observation of GRB 120226A
  72. GRB 120226A: Fermi-LAT data analysis
  73. GRB 120224A: VLT/X-shooter observations
  74. GRB 120224A: optical observation in Mondy observatory
  75. GRB 120226A: Fermi-LAT detection of a burst
  76. GRB 120224A: GROND detection of the afterglow candidate
  77. GRB 120224A: Swift-XRT refined Analysis
  78. Swift Trigger 516027 is CC Eri
  79. GRB 120224A: Swift/UVOT Upper Limits
  80. GRB 120224A: FTN optical observations
  81. GRB 120224A: Enhanced Swift-XRT position
  82. GRB 120224A: Swift detection of a burst
  83. GRB 1202019A: optical observation in Mondy observatory
  84. GRB 120219A: MASTER prompt and early optical limit and OT discussion
  85. GRB 120219A: 1.23m CAHA optical observations
  86. GRB120219A: Keck Observations
  87. GRB 120215A: MITSuME Akeno Optical upper limits
  88. GRB 120219A: Swift-XRT refined Analysis
  89. GRB 120219A: Swift/UVOT Upper Limits
  90. GRB 120219A: MITSuME Okayama Optical upper limits
  91. GRB 120219A: Enhanced Swift-XRT position
  92. GRB120219A: TNT optical afterglow candidates
  93. GRB 120219A: MASTER-NET prompt and early optical observations
  94. GRB 120219A: Swift detection of a burst
  95. GRB 120218A: Swift detection of a burst
  96. GRB 120215A: Swift/UVOT Upper Limits
  97. GRB 120215A: MITSuME Okayama Optical upper limits
  98. GRB 120215A: Swift-XRT refined Analysis
  99. Fermi GBM detection of an SGR-like burst
  100. GRB 120215A: Enhanced Swift-XRT position

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