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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"

908 results found.

  1. GRB 060403: MITSuME optical observation
  2. GRB 060323: Tautenburg OT candidate retraction
  3. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  4. Spectral properties of GRB060218/SN2006aj
  5. GRB 060218: emergence of the underlying SN spectrum
  6. GRB 060204B: ART early limit
  7. GRB 060204B: ART optical limit
  8. GRB 060124: ART optical limits during the burst
  9. GRB 060124: Confirmation of the Afterglow
  10. GRB 060124: Optical Observations at Tautenburg
  11. GRB 060115: OT photometry with MITSuME
  12. GRB 060115: MITSuME optical afterglow candidate
  13. GRB 060111B: MITSuME detection of optical afterglow
  14. GRB 060110: Mitsume optical observations
  15. GRB 060110: Optical observation
  16. GRB 060110: Optical limit
  17. GRB 060108: Mitsume optical observations
  18. GRB 060105: Mitsume optical observations
  19. GRB 051227: optical observation
  20. GRB051117B: optical observation
  21. GRB 051109B: GAO 150cm telescope Optical limit
  22. GRB 051111a: Afterglow fading in Ic
  23. GRB 051109: PROMPT Detections
  24. GRB 051109: Rc and Ic observations
  25. GRB 051105b: ART optical limits
  26. GRB 051105: Optical limit
  27. GRB 051021: PROMPT RcIc Observations
  28. GRB 050502b: Optical limit
  29. GRB 051016b: Optical limit
  30. GRB 050922B: optical limit
  31. GRB 050906: RTT150 optical observations
  32. GRB 050908: Optical Observations
  33. GRB 050906: MARGE Optical Limits
  34. GRB 050906: Swift-BAT refined analysis
  35. GRB 050906: Bright galaxy in BAT error box
  36. GRB 050904: SOAR YJ and PROMPT Ic Observations
  37. GRB050824, I-band imaging
  38. GRB050820A: RTT150 optical observations
  39. GRB050820a: PROMPT RcIc Observations
  40. GRB050820A: RTT150 optical observations
  41. GRB 050724: Optical limit
  42. GRB 050717: PROMPT RcIc Observations
  43. GRB 050716: Optical Observations
  44. GRB 050607: PROMPT VRcIc Observations
  45. GRB050505: AAVSO observations
  46. GRB 050412: PROMPT VRcIc Observations
  47. GRB050326: optical limit
  48. GRB 050319: Optical observation
  49. PROMPT VRcIc Observations of GRB 050223
  50. GRB 050117: Optical observation
  51. GRB041219, early time observations
  52. GRB 040924: Afterglow Color
  53. GRB 040916: Afterglow Color at Early Times
  54. GRB041006 (=HETE3570): optical observations
  55. XRF040916: continuing decay of OT
  56. XRF040916, optical observations
  57. XRF040916: Optical Transient Candidate by Subaru
  58. XRF040916, Ic observations
  59. GRB 040825A: Optical observations.
  60. GRB 040730: Optical observations
  61. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  62. SN 2003dh/GRB030329 late-time optical spectroscopy
  63. SN 2003jd (SN/GRB?), Radio Observations
  64. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  65. GRB 031026: Further Ic Observations
  66. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  67. GRB 031026: Ic Observations
  68. XRF 030723: Subaru Optical Observations
  69. GRB 030519B: optical observations.
  70. GRB 030329: Correction to GCN 2254
  71. GRB 030329: Optical Observations
  72. GRB 030416: Optical Observations
  73. GRB 030329 Optical Observations
  74. GRB030429, BVRcIc field photometry
  75. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  76. GRB 030329, the review of the sky area in plate archive (1950-1998)
  77. GRB 030329 and SN 2003dh
  78. GRB 030329, color evolution
  79. OT GRB light curves and SN predictions
  80. GRB030329, new UBVRcIc field photometry
  81. GRB 030324: Optical and NIR Observations
  82. GRB030323: V, R, I photometry
  83. GRB 030226: Ic Observations
  84. GRB 030204: Optical Observations
  85. Type Ic SN2003L (SN/GRB?), optical spectrum
  86. Type Ic SN2003L (SN/GRB?) Radio Observations
  87. GRB021219, optical observations
  88. GRB 021204: I-band Observations
  89. GRB021004, late time optical observations
  90. GRB 021112: Afterglow or Variable Star?
  91. GRB021004, astrometric position
  92. GRB020813, astrometric position
  93. GRB 020715, optical observations
  94. GRB 020714, optical observations
  95. GRB 020409, 2-nd epoch optical observations at Terskol.
  96. GRB 020409, No Optical Detection to R = 22
  97. Type Ic SN2002bl (SN/GRB?) Radio Observations
  98. GRB020124 BVRI field photometry
  99. GRB011212, Optical Observations
  100. GRB000926, Host Galaxy Observations

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