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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"

43116 results found.

  1. GRB130313A: Optical observations from GTC
  2. GRB 130313A: NOT optical upper limit
  3. GRB 130313A: Swift-XRT refined Analysis
  4. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  5. GRB 130313A: Weihai optical upper limit
  6. GRB 130313A: Swift-BAT refined analysis
  7. GRB 130313A: Zadko observatory - Gingin optical observations
  8. GRB 130313A: MASTER-Net optical observations
  9. GRB 130313A: Swift detection of a short burst
  10. IPN Triangulation of GRB 130307A
  11. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  12. GRB 130310A: optical observations
  13. Swift XRT observations of GRB 130310A
  14. GRB 130306A: Swift Detection of a Possible Afterglow
  15. GRB 130131B: host detection and redshift
  16. Konus-Wind observation of GRB 130310A
  17. IPN triangulation of GRB 130310A
  18. GRB 130310A: Fermi GBM detection
  19. GRB 130310A: Fermi-LAT detection and localization
  20. GRB 130131A: JCMT SCUBA-2 sub-mm observations
  21. GRB 130306A: MITSuME Ishigakijima upper limits
  22. IPN triangulation of GRB 130228A
  23. GRB 130305A BAT refined circular
  24. GRB 130305A: Further Swift-XRT Observations
  25. Konus-Wind observation of GRB 130306A
  26. GRB 130305A: Optical Observations
  27. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  28. GRB 130307A: Fermi GBM detection
  29. GRB 130306A: Fermi GBM observation
  30. GRB 130306A: MASTER-Net pre-Swift alert observation
  31. GRB 130305A: Swift/UVOT Upper Limit
  32. GRB 130305A: RATIR Observations
  33. GRB 130306A: Swift detection of a burst
  34. GRB 130305A: P60 Observations
  35. GRB 100615A: HST host detection and X-shooter redshift
  36. GRB 130305A: Swift/XRT detection of the afterglow
  37. Konus-Wind observation of GRB 130305A
  38. GRB 130305A: Fermi GBM observation
  39. GRB 130305A: Fermi LAT Detection
  40. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  41. GRB 130305A found in ground analysis of Swift/BAT data
  42. GRB 121128A: optical observations in Mondy observatory
  43. GRB 130216A: Swift/UVOT Upper Limit
  44. GRB 130219A: Suzaku WAM observation of the prompt emission
  45. Trigger 549841: Swift detection of SGR1806-20
  46. Konus-Wind observation of GRB 130219A
  47. GRB 130216B: Suzaku WAM observation of the prompt emission
  48. GRB 130216A: possible radio counterpart is steady field source
  49. IPN Triangulation of GRB 130219A
  50. GRB 130215A: Suzaku WAM observation of the prompt emission
  51. GRB 130215A: PTF P48 optical detection
  52. GRB 130219A: Fermi GBM detection
  53. GRB 130216A: Further Swift-BAT refined analysis
  54. GRB 130216B: MASTER-Net early observation
  55. GRB 130216A: MASTER-Net early observations
  56. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  57. GRB 130216A: Fermi GBM observation
  58. GRB 130216B: Fermi GBM observation
  59. GRB 130216A: possible early detection at 15 GHz
  60. GRB 130216A: MITSuME Ishigakijima upper limits
  61. GRB 130216B BAT refined analysis
  62. GRB 130216B: P200 NIR Observations
  63. GRB 130216A: P200 NIR Observations
  64. GRB 130216A: Swift-BAT refined analysis
  65. GRB 130216A: TAROT La Silla observatory optical observations
  66. GRB 130215A: Additional P200 NIR observations
  67. GRB 120118B: host observations and redshift determination
  68. GRB 130216A: OSN I-band observations
  69. GRB 130216A: Swift detection of a burst
  70. GRB 130215A: P200 NIR observations
  71. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  72. GRB 130215A: MITSuME Okayama Optical Observation
  73. GRB 130215A: Fermi GBM detection
  74. GRB 130215A: RAPTOR Measurements
  75. GRB 130215A: GMG optical observation
  76. GRB 130215A: iTelescope T11 observations
  77. GRB 130215A: Xinglong optical observations
  78. GRB 130215A: Swift-BAT refined analysis
  79. GRB 130215A: TAROT La Silla observatory optical observations
  80. GRB 130215A: RATIR Optical and NIR Observations
  81. GRB 130215A: REM NIR observations
  82. GRB 130215A: CARMA 3mm detection
  83. GRB 130215A: P60 Observations
  84. GRB 130215A: ROTSE-III data analysis
  85. GRB 130215A: Redshift estimate
  86. Skynet Observations of GRB130215
  87. GRB 130215A: Swift detection of a burst
  88. Swift GRB130206A: late XRT observations.
  89. GRB 130131B: CTIO 0.9-m optical upper-limits
  90. GRB 130211A: Swift/UVOT Upper Limits
  91. GRB 130211A: Swift-XRT refined Analysis
  92. GRB 130211A: Swift-BAT refined analysis
  93. GRB 130211A: GROND detection of the afterglow
  94. GRB 130211A: Swift detection of a burst
  95. GRB 130131A: MITSuME Akeno Optical upper limits
  96. GRB 130131B: MITSuME Akeno Optical upper limits
  97. GRB 130122A: PTF P48 optical upper limits
  98. GRB 130206A: GROND Observations
  99. GRB 130206A: Fermi LAT Observations
  100. GRB 130206A: Fermi GBM observation

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