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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"

38015 results found.

  1. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  2. GRB 041006 : Optical follow-up observation at KISO
  3. GRB 041006: Finding chart
  4. GRB 041006: Optical afterglow candidate
  5. XRF 020903: Observations of the Host Galaxy (authors)
  6. GRB 040924: Second Epoch WSRT Radio Observations
  7. radio observations, GRB 040924
  8. IBAS Alert 1991. Not a real GRB
  9. GRB040929,optical observation
  10. GRB040924,optical observation
  11. GRB040924, RTT150 optical observation
  12. GRB 040924: detection of possible host galaxy by Subaru
  13. GRB040924, RTT150 optical observation
  14. GRB040924: KAIT observations
  15. GRB040924: Afterglow magnitude at t=17.5hr
  16. GRB 040924: WSRT Radio Observations
  17. GRB 040924: NIR finding chart
  18. GRB040924 : Optical candidate observations at Lulin observatory
  19. GRB040924 : Optical candidate observations at Lulin observatory
  20. GRB 040924: Subaru NIR observation
  21. GRB 040924: RTT150 optical observations
  22. GRB 040924, optical follow-up
  23. IPN triangulation of GRB040924 (H3564)
  24. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  25. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  26. XRF040916: continuing decay of OT
  27. TAROT Observations of GRB 040916 (HETE #3558)
  28. XRF040916, optical observations
  29. XRF040916: Optical Transient Candidate by Subaru
  30. GRB040916 optical limits 17 min after GRB
  31. XRF 040912 (=H3557): Spectral and Temporal Properties
  32. XRF040916, Ic observations
  33. XRF040912, BVRcIc field calibration
  34. XRF040916, BVRcIc field calibration
  35. GRB040916: Archival optical observations
  36. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  37. GRB040916: Optical observations
  38. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  39. GRB040912 (= H3557): Chandra Observations Scheduled
  40. GRB 040912: Optical Observations
  41. GRB/XRF040912,optical observations
  42. GRB 040912, BVRI observations
  43. Optical observations of GRB/XRF 040912 = HETE 3557
  44. An intense burst from SGR1806-20
  45. IBAS GRB Alerts 1978-1980
  46. Optical observations of field of GRB040912
  47. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  48. GRB 040827: XMM-Newton data
  49. GRB040903 - A XRF?
  50. GRB040827: analysis of the XMM-Newton observation
  51. GRB 040903 - INTEGRAL data analysis
  52. IBAS Alert 1974. Not a real GRB
  53. Very bright burst detected from SGR 1806-20
  54. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  55. Possible GRB 040903 - further analysis
  56. Possible GRB 040903 detected with INTEGRAL
  57. GRB 040827 - Radio Observations
  58. XMM-Newton Images of GRB 040827
  59. GRB 040827: optical and NIR observations at the VLT
  60. GRB 040827: UKIRT - 2nd epoch K-band imaging
  61. GRB 040827: 2nd epoch of Magellan K-band imaging
  62. GRB 040827: K imaging - no evidence of variability
  63. GRB 040827: Detection of NIR afterglow
  64. GRB 040827: Possible detection of optical afterglow
  65. GRB 040827: RTT150 optical observations
  66. GRB040825A: optical limit before GRB
  67. GRB 040825B: Optical observations
  68. GRB040827 optical observations
  69. GRB 040827 : Planned XMM-Newton observation
  70. GRB 040827 - Refined position
  71. GRB 040827 : peak flux
  72. GRB 040827 - A long GRB detected by INTEGRAL
  73. GRB040825B, BVRcIc field photometry
  74. GRB040825A, BVRcIc field photometry
  75. GCN GRB OBSERBATION REPORT
  76. GRB 040825A,optical observations
  77. Increase of SGR 1806-20 activity
  78. GRB 040825A: Optical observations.
  79. GRB040825B: Correction to GCN 2657
  80. GRB 040825: Optical observations
  81. GRB 040812: Second epoch CXO Observations
  82. GRB040823,optical observation
  83. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  84. XRF 040812: optical observation at VLT
  85. GRB 040812: Optical counterparts of CXO sources
  86. XRF040812: possible afterglow
  87. CXO observation of GRB 040812
  88. IPN/HETE localizations of GRB040810 (=H3489)
  89. GRB 040812: Keck and LCO optical observations
  90. GRB 040812: Keck and LCO observations
  91. GRB 040812: radio observations
  92. GRB040812, optical/IR observations
  93. Konus-Wind observation of GRB040810 (=H3489)
  94. GRB 040812: a long GRB detected by INTEGRAL
  95. GRB 040810: Optical observations of a limited region
  96. IPN/HETE triangulation of GRB040802 (=H3485)
  97. GRB 040730, infrared observations
  98. GRB 040730: Optical observations
  99. GRB 040730: a long GRB detected with INTEGRAL
  100. Ongoing activity of SGR 1806-20

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