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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"

37814 results found.

  1. GRB 041006: Finding chart
  2. GRB 041006: Optical afterglow candidate
  3. XRF 020903: Observations of the Host Galaxy (authors)
  4. GRB 040924: Second Epoch WSRT Radio Observations
  5. radio observations, GRB 040924
  6. IBAS Alert 1991. Not a real GRB
  7. GRB040929,optical observation
  8. GRB040924,optical observation
  9. GRB040924, RTT150 optical observation
  10. GRB 040924: detection of possible host galaxy by Subaru
  11. GRB040924, RTT150 optical observation
  12. GRB040924: KAIT observations
  13. GRB040924: Afterglow magnitude at t=17.5hr
  14. GRB 040924: WSRT Radio Observations
  15. GRB 040924: NIR finding chart
  16. GRB040924 : Optical candidate observations at Lulin observatory
  17. GRB040924 : Optical candidate observations at Lulin observatory
  18. GRB 040924: Subaru NIR observation
  19. GRB 040924: RTT150 optical observations
  20. GRB 040924, optical follow-up
  21. IPN triangulation of GRB040924 (H3564)
  22. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  23. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  24. XRF040916: continuing decay of OT
  25. TAROT Observations of GRB 040916 (HETE #3558)
  26. XRF040916, optical observations
  27. XRF040916: Optical Transient Candidate by Subaru
  28. GRB040916 optical limits 17 min after GRB
  29. XRF 040912 (=H3557): Spectral and Temporal Properties
  30. XRF040916, Ic observations
  31. XRF040912, BVRcIc field calibration
  32. XRF040916, BVRcIc field calibration
  33. GRB040916: Archival optical observations
  34. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  35. GRB040916: Optical observations
  36. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  37. GRB040912 (= H3557): Chandra Observations Scheduled
  38. GRB 040912: Optical Observations
  39. GRB/XRF040912,optical observations
  40. GRB 040912, BVRI observations
  41. Optical observations of GRB/XRF 040912 = HETE 3557
  42. An intense burst from SGR1806-20
  43. IBAS GRB Alerts 1978-1980
  44. Optical observations of field of GRB040912
  45. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  46. GRB 040827: XMM-Newton data
  47. GRB040903 - A XRF?
  48. GRB040827: analysis of the XMM-Newton observation
  49. GRB 040903 - INTEGRAL data analysis
  50. IBAS Alert 1974. Not a real GRB
  51. Very bright burst detected from SGR 1806-20
  52. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  53. Possible GRB 040903 - further analysis
  54. Possible GRB 040903 detected with INTEGRAL
  55. GRB 040827 - Radio Observations
  56. XMM-Newton Images of GRB 040827
  57. GRB 040827: optical and NIR observations at the VLT
  58. GRB 040827: UKIRT - 2nd epoch K-band imaging
  59. GRB 040827: 2nd epoch of Magellan K-band imaging
  60. GRB 040827: K imaging - no evidence of variability
  61. GRB 040827: Detection of NIR afterglow
  62. GRB 040827: Possible detection of optical afterglow
  63. GRB 040827: RTT150 optical observations
  64. GRB040825A: optical limit before GRB
  65. GRB 040825B: Optical observations
  66. GRB040827 optical observations
  67. GRB 040827 : Planned XMM-Newton observation
  68. GRB 040827 - Refined position
  69. GRB 040827 : peak flux
  70. GRB 040827 - A long GRB detected by INTEGRAL
  71. GRB040825B, BVRcIc field photometry
  72. GRB040825A, BVRcIc field photometry
  73. GCN GRB OBSERBATION REPORT
  74. GRB 040825A,optical observations
  75. Increase of SGR 1806-20 activity
  76. GRB 040825A: Optical observations.
  77. GRB040825B: Correction to GCN 2657
  78. GRB 040825: Optical observations
  79. GRB 040812: Second epoch CXO Observations
  80. GRB040823,optical observation
  81. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  82. XRF 040812: optical observation at VLT
  83. GRB 040812: Optical counterparts of CXO sources
  84. XRF040812: possible afterglow
  85. CXO observation of GRB 040812
  86. IPN/HETE localizations of GRB040810 (=H3489)
  87. GRB 040812: Keck and LCO optical observations
  88. GRB 040812: Keck and LCO observations
  89. GRB 040812: radio observations
  90. GRB040812, optical/IR observations
  91. Konus-Wind observation of GRB040810 (=H3489)
  92. GRB 040812: a long GRB detected by INTEGRAL
  93. GRB 040810: Optical observations of a limited region
  94. IPN/HETE triangulation of GRB040802 (=H3485)
  95. GRB 040730, infrared observations
  96. GRB 040730: Optical observations
  97. GRB 040730: a long GRB detected with INTEGRAL
  98. Ongoing activity of SGR 1806-20
  99. GRB040624: optical monitoring at TNG
  100. Cancellation of IBAS/INTEGRAL GRB alerts

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