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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"

32705 results found.

  1. Optical transient (GRB?) in Lynx
  2. GRB041211: Continued P60 Observations
  3. GRB041211, Faulkes Telescope optical observation
  4. GRB041211, BVRcIc field calibration
  5. GRB 041211: Infrared Observations
  6. GRB 041211: Optical follow-up in East Asian region
  7. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  8. GRB041015: Near-Infrared observations
  9. GRB 040924: Afterglow Color
  10. GRB 041006: GETS Optical Afterglow Observation
  11. Summary of the recent bursts from SGR 1806-20
  12. GRB 041006: Optical Observations
  13. GRB041006, late-time optical photometry
  14. GRB041006: RTT150 Optical Observations
  15. GRB041015 : Multi epoch optical observations
  16. GRB041006: RTT150 Optical Observations
  17. GRB 041016: Optical limits
  18. GRB 041015: Optical Observations at Rikubetsu
  19. GRB041006: Near Infrared observations
  20. GRB040924, BVRcIc field calibration
  21. GRB 041015: Optical limit at Osaka University
  22. GRB041015 : Optical follow-up at Kiso
  23. GRB 041006 R observations in Loiano
  24. GRB041006: VLT observations of the afterglow and host galaxy
  25. GRB041006: Optical observations and Potential host galaxy
  26. GRB041006, BVRcIc field calibration
  27. GRB 040924: VLT spectroscopy
  28. GRB 041006: SARA afterglow observations
  29. GRB041006, optical observation in CrAO
  30. Search for SN light in XRF 040912 with MEGACAM
  31. GRB 040916: Afterglow Color at Early Times
  32. GRB 041006 Optical afterglow observations
  33. GRB 041006: BR observations with VATT
  34. GRB 041006: Redshift confirmed
  35. GRB041006: Liverpool Telescope optical observations
  36. GRB 041006: Colour measurement
  37. GRB041006: break in the light curve
  38. GRB 041006: Radio Observations
  39. GRB 041006 : optical follow-up observation at Lulin Observatory
  40. GRB 041006 : Optical follow-up observation at TAROT
  41. GRB041006: Optical photometry and spectroscopy at TNG
  42. GRB 041006: presice astrometry
  43. GRB041006 (= H3570): Chandra Observations In Progress
  44. GRB 041006 : optical observation at Bisei
  45. GRB041006, optical I observation
  46. GRB041006 (=HETE3570): optical observations
  47. ROTSE-IIIa Observations of GRB 041006
  48. GRB041006, optical observation
  49. GRB041006, submillimetre observations
  50. GRB041006: MASTER optical observations
  51. GRB 041006: Optical decay
  52. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  53. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  54. GRB041006: Fading of optical afterglow candidate
  55. GRB 041006 : Optical follow-up observation at KISO
  56. GRB 041006: Finding chart
  57. GRB 041006: Optical afterglow candidate
  58. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  59. XRF 020903: Observations of the Host Galaxy (authors)
  60. XRF 020903: Observations of the Host Galaxy
  61. GRB 040924: Second Epoch WSRT Radio Observations
  62. radio observations, GRB 040924
  63. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  64. GRB040924,optical observation
  65. GRB040924, RTT150 optical observation
  66. GRB040924,optical observation
  67. GRB 040924: detection of possible host galaxy by Subaru
  68. GRB040924, RTT150 optical observation
  69. GRB040924: KAIT observations
  70. GRB040924: Afterglow magnitude at t=17.5hr
  71. GRB 040924: WSRT Radio Observations
  72. GRB 040924: NIR finding chart
  73. GRB040924 : Optical candidate observations at Lulin observatory
  74. GRB040924 : Optical candidate observations at Lulin observatory
  75. GRB 040924: Subaru NIR observation
  76. GRB 040924: RTT150 optical observations
  77. GRB 040924, optical follow-up
  78. GRB040924: MASTER: OT decay
  79. IPN triangulation of GRB040924 (H3564)
  80. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  81. XRF 040912: Radio Observations
  82. XRF 040916: Radio Observations
  83. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  84. XRF040916: continuing decay of OT
  85. TAROT Observations of GRB 040916 (HETE #3558)
  86. GRB040912(=H3557): Candidate Optical Afterglow
  87. XRF040916, optical observations
  88. XRF040916: Optical Transient Candidate by Subaru
  89. XRF 040912, identification of CXO sources
  90. XRF040916, Ic observations
  91. XRF040916: optical follow-up observations
  92. XRF040912, BVRcIc field calibration
  93. XRF040916, BVRcIc field calibration
  94. GRB040916: Archival optical observations
  95. XRF 040916, optical follow-up
  96. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  97. GRB040916: Optical observations
  98. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  99. GRB040916 (= H3558): A Long XRF Localized by HETE
  100. GRB040912 (= H3557): Chandra Observations Scheduled

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