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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"

43681 results found.

  1. GRB041006, optical I observation
  2. GRB041006 (=HETE3570): optical observations
  3. ROTSE-IIIa Observations of GRB 041006
  4. GRB041006, optical observation
  5. GRB041006, submillimetre observations
  6. GRB 041006: Optical decay
  7. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  8. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  9. GRB041006: Fading of optical afterglow candidate
  10. GRB 041006: Finding chart
  11. GRB 041006: Optical afterglow candidate
  12. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  13. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  14. XRF 020903: Observations of the Host Galaxy (authors)
  15. XRF 020903: Observations of the Host Galaxy
  16. GRB 040924: Second Epoch WSRT Radio Observations
  17. radio observations, GRB 040924
  18. IBAS Alert 1991. Not a real GRB
  19. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  20. GRB040924, RTT150 optical observation
  21. GRB040924,optical observation
  22. GRB 040924: detection of possible host galaxy by Subaru
  23. GRB040924, RTT150 optical observation
  24. GRB040924: KAIT observations
  25. GRB040924: Afterglow magnitude at t=17.5hr
  26. GRB 040924: WSRT Radio Observations
  27. GRB 040924: NIR finding chart
  28. GRB040924 : Optical candidate observations at Lulin observatory
  29. GRB 040924: Subaru NIR observation
  30. GRB040924: Optical afterglow properties
  31. GRB 040924: RTT150 optical observations
  32. GRB 040924, optical follow-up
  33. GRB040924: MASTER: OT decay
  34. IPN triangulation of GRB040924 (H3564)
  35. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  36. GRB040924 (H3564): Optical afterglow candidate
  37. XRF 040912: Radio Observations
  38. XRF 040916: Radio Observations
  39. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  40. XRF040916: continuing decay of OT
  41. TAROT Observations of GRB 040916 (HETE #3558)
  42. GRB040912(=H3557): Candidate Optical Afterglow
  43. XRF040916, optical observations
  44. XRF040916: Optical Transient Candidate by Subaru
  45. GRB040916 optical limits 17 min after GRB
  46. XRF 040912, identification of CXO sources
  47. XRF 040912 (=H3557): Spectral and Temporal Properties
  48. XRF040916, Ic observations
  49. XRF040916: optical follow-up observations
  50. XRF040912, BVRcIc field calibration
  51. XRF040916, BVRcIc field calibration
  52. GRB040916: Archival optical observations
  53. XRF 040916, optical follow-up
  54. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  55. GRB040916: Optical observations
  56. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  57. GRB040916 (= H3558): Improved Localization from HETE WXM
  58. GRB040916 (= H3558): A Long XRF Localized by HETE
  59. GRB040912 (= H3557): Chandra Observations Scheduled
  60. GRB 040912: Optical Observations
  61. GRB/XRF040912,optical observations
  62. GRB 040912, BVRI observations
  63. An intense burst from SGR1806-20
  64. GRB040912 : Kiso Optical follow-up observation
  65. IBAS GRB Alerts 1978-1980
  66. Optical observations of field of GRB040912
  67. HETE 3557: Optical observations
  68. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  69. GRB 040827: XMM-Newton data
  70. GRB040903 - A XRF?
  71. GRB040827: analysis of the XMM-Newton observation
  72. GRB040903, REM near-IR observation
  73. GRB 040903 - INTEGRAL data analysis
  74. IBAS Alert 1974. Not a real GRB
  75. Very bright burst detected from SGR 1806-20
  76. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  77. Possible GRB 040903 detected with INTEGRAL
  78. GRB 040827 - Radio Observations
  79. XMM-Newton Images of GRB 040827
  80. GRB040825A: Optical observations
  81. GRB 040827: optical and NIR observations at the VLT
  82. GRB 040827: UKIRT - 2nd epoch K-band imaging
  83. GRB 040827: 2nd epoch of Magellan K-band imaging
  84. GRB 040827: K imaging - no evidence of variability
  85. GRB 040827: Detection of NIR afterglow
  86. GRB 040827: Possible detection of optical afterglow
  87. GRB040827 XMM-Newton observation
  88. GRB040825A: optical limit before GRB
  89. GRB 040825B: Optical observations
  90. GRB040827 optical observations
  91. GRB 040827 - Refined position
  92. GRB 040827 - A long GRB detected by INTEGRAL
  93. GRB040825B, BVRcIc field photometry
  94. GRB040825A, BVRcIc field photometry
  95. Increase of SGR 1806-20 activity
  96. GRB040825A: optical observations
  97. GRB040825B: optical observations
  98. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  99. GRB 040825A: Optical observations.
  100. GRB 040825: Optical observations

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