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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"

45673 results found.

  1. GRB 041016: Optical limits
  2. GRB 041016: Optical limits in V, R, I
  3. GRB 041016:Optical limit during first minute
  4. GRB041016: MASTER: Optical observations
  5. GRB 041015: Optical Observations at Rikubetsu
  6. GRB041006: Near Infrared observations
  7. GRB 041016: Optical limit
  8. GRB 041015 R band observations
  9. GRB040924, BVRcIc field calibration
  10. GRB041015: MASTER: Optical observations
  11. GRB041015,optical observation
  12. GRB041006: Fading X-ray Afterglow Observed with Chandra
  13. GRB 041015: Optical limit at Osaka University
  14. GRB041015 : Optical follow-up at Kiso
  15. GRB 041015 - A long GRB detected by INTEGRAL
  16. GRB 041006 R observations in Loiano
  17. GRB041006: VLT observations of the afterglow and host galaxy
  18. GRB041006: Optical observations and Potential host galaxy
  19. GRB041006, BVRcIc field calibration
  20. GRB 040924: VLT spectroscopy
  21. GRB 041006: SARA afterglow observations
  22. GRB041006, optical observation in CrAO
  23. Search for SN light in XRF 040912 with MEGACAM
  24. GRB 040916: Afterglow Color at Early Times
  25. GRB 041006 Optical afterglow observations
  26. IBAS GRB Alert # 2010
  27. GRB 041006: BR observations with VATT
  28. GRB 041006: Redshift confirmed
  29. GRB041006: Liverpool Telescope optical observations
  30. GRB 041006: Colour measurement
  31. GRB041006: break in the light curve
  32. GRB 041006: Radio Observations
  33. GRB041006, further submilllimetre observations
  34. GRB 041006 : optical follow-up observation at Lulin Observatory
  35. GRB 041006 : Optical follow-up observation at TAROT
  36. GRB041006: Optical photometry and spectroscopy at TNG
  37. GRB 041006: presice astrometry
  38. GRB041006 (= H3570): Chandra Observations In Progress
  39. GRB 041006 : optical observation at Bisei
  40. GRB041006, optical I observation
  41. GRB041006 (=HETE3570): optical observations
  42. ROTSE-IIIa Observations of GRB 041006
  43. GRB041006, optical observation
  44. GRB041006, submillimetre observations
  45. GRB041006: MASTER optical observations
  46. GRB041006,optical observation
  47. GRB 041006: Optical decay
  48. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  49. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  50. GRB041006: Fading of optical afterglow candidate
  51. GRB 041006: Finding chart
  52. GRB 041006: Optical afterglow candidate
  53. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  54. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  55. XRF 020903: Observations of the Host Galaxy (authors)
  56. XRF 020903: Observations of the Host Galaxy
  57. GRB 040924: Second Epoch WSRT Radio Observations
  58. radio observations, GRB 040924
  59. IBAS Alert 1991. Not a real GRB
  60. GRB040929,optical observation
  61. GRB040929: MASTER optical observations
  62. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  63. GRB040924,optical observation
  64. GRB040924, RTT150 optical observation
  65. GRB040924,optical observation
  66. GRB 040924: detection of possible host galaxy by Subaru
  67. GRB040924, RTT150 optical observation
  68. GRB040924: KAIT observations
  69. GRB040924: Afterglow magnitude at t=17.5hr
  70. GRB 040924: WSRT Radio Observations
  71. GRB 040924: NIR finding chart
  72. GRB040924 : Optical candidate observations at Lulin observatory
  73. GRB040924 : Optical candidate observations at Lulin observatory
  74. GRB 040924: Subaru NIR observation
  75. GRB040924: Optical afterglow properties
  76. GRB 040924: RTT150 optical observations
  77. GRB 040924, optical follow-up
  78. GRB040924: MASTER: OT decay
  79. GRB040924: MASTER Optical observations
  80. IPN triangulation of GRB040924 (H3564)
  81. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  82. GRB040924 (H3564): Optical afterglow candidate
  83. XRF 040912: Radio Observations
  84. XRF 040916: Radio Observations
  85. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  86. XRF040916: continuing decay of OT
  87. TAROT Observations of GRB 040916 (HETE #3558)
  88. GRB040912(=H3557): Candidate Optical Afterglow
  89. XRF040916, optical observations
  90. XRF040916: Optical Transient Candidate by Subaru
  91. GRB040916 optical limits 17 min after GRB
  92. XRF 040912, identification of CXO sources
  93. XRF 040912 (=H3557): Spectral and Temporal Properties
  94. XRF040916, Ic observations
  95. XRF040916: optical follow-up observations
  96. XRF040912, BVRcIc field calibration
  97. XRF040916, BVRcIc field calibration
  98. GRB040916: Archival optical observations
  99. XRF 040916, optical follow-up
  100. GRB040912(=H3557): Observations with the Chandra X-ray Observatory

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