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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"

36211 results found.

  1. GRB041219: Confirmed NIR Afterglow
  2. GRB041218: Continued P60 Optical Observations
  3. GRB 041218: Optical Observation
  4. GRB 041219: Infrared Afterglow Candidate
  5. GRB041219, BVRcIc field calibration
  6. GRB 041219: Infrared Afterglow Candidate
  7. GRB041218, BVRcIc field calibration
  8. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  9. GRB041219: P60 Optical Observations
  10. GRB 041219 - A long GRB detected by INTEGRAL
  11. GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger
  12. GRB 041217: PROMPT Observations
  13. GRB041218: optical observations
  14. GRB041217: optical limit 30 min after GRB
  15. GRB 041218; optical candidate
  16. GRB 041218: Optical observations
  17. GRB 041217: LCO40 Optical Observations and Possible Candidates
  18. GRB 041218 - A long GRB detected by integral
  19. GRB041217: Optical Observations
  20. GRB041217: P60 Optical Observations
  21. GRB041217: Infrared Observations
  22. GRB041217: The First GRB Located On-Board Swift
  23. GRB041211: Faulkes Telescope continued optical monitoring
  24. Optical Transient in Lynx not a GRB
  25. Optical transient (GRB?) in Lynx
  26. Optical transient (GRB?) in Lynx, UT Dec 11.4436
  27. GRB041211: Continued P60 Observations
  28. GRB041211: RAPTOR observations
  29. GRB041211: Ashra Prototype optical observation
  30. GRB041211, Faulkes Telescope optical observation
  31. GRB041211, BVRcIc field calibration
  32. GRB 041211: Infrared Observations
  33. GRB 041211: KAIT observations
  34. GRB 041211: Optical follow-up in East Asian region
  35. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  36. GRB041211: P60 optical imaging
  37. GRB970815: Discovery of Optical Afterglow
  38. Distribution of IBAS Alerts for NON-GRB sources
  39. Triangulation of short GRB 041116 (large error box)
  40. GRB 040924: Afterglow Color
  41. GRB 041006: GETS Optical Afterglow Observation
  42. Summary of the recent bursts from SGR 1806-20
  43. GRB 041006: Optical Observations
  44. GRB041006, late-time optical photometry
  45. IBAS GRB Alert # 2034
  46. GRB041006: RTT150 Optical Observations
  47. Bright bursts from SGR1806-20
  48. GRB 041016: BOOTES-2 simultaneous observation
  49. GRB041006: RTT150 Optical Observations
  50. GRB 041016: Optical limits
  51. GRB 041016: Optical limits in V, R, I
  52. GRB 041016:Optical limit during first minute
  53. GRB041016: MASTER: Optical observations
  54. GRB 041015: Optical Observations at Rikubetsu
  55. GRB041006: Near Infrared observations
  56. GRB 041016: Optical limit
  57. GRB 041015 R band observations
  58. GRB040924, BVRcIc field calibration
  59. GRB041015: MASTER: Optical observations
  60. GRB041015,optical observation
  61. GRB 041015: Optical limit at Osaka University
  62. GRB041015 : Optical follow-up at Kiso
  63. GRB 041015 - A long GRB detected by INTEGRAL
  64. GRB 041006 R observations in Loiano
  65. GRB041006: VLT observations of the afterglow and host galaxy
  66. GRB041006: Optical observations and Potential host galaxy
  67. GRB041006, BVRcIc field calibration
  68. GRB 040924: VLT spectroscopy
  69. GRB 041006: SARA afterglow observations
  70. Search for SN light in XRF 040912 with MEGACAM
  71. GRB 040916: Afterglow Color at Early Times
  72. GRB 041006 Optical afterglow observations
  73. IBAS GRB Alert # 2010
  74. GRB 041006: BR observations with VATT
  75. GRB 041006: Redshift confirmed
  76. GRB041006: Liverpool Telescope optical observations
  77. GRB 041006: Colour measurement
  78. GRB041006: break in the light curve
  79. GRB 041006: Radio Observations
  80. GRB041006, further submilllimetre observations
  81. GRB 041006 : optical follow-up observation at Lulin Observatory
  82. GRB 041006 : Optical follow-up observation at TAROT
  83. GRB041006: Optical photometry and spectroscopy at TNG
  84. GRB 041006: presice astrometry
  85. GRB041006 (= H3570): Chandra Observations In Progress
  86. GRB 041006 : optical observation at Bisei
  87. GRB041006 (=HETE3570): optical observations
  88. ROTSE-IIIa Observations of GRB 041006
  89. GRB041006, submillimetre observations
  90. GRB041006: MASTER optical observations
  91. GRB 041006: Optical decay
  92. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  93. GRB 041006 : Optical follow-up observation at KISO
  94. GRB 041006: Finding chart
  95. GRB 041006: Optical afterglow candidate
  96. XRF 020903: Observations of the Host Galaxy (authors)
  97. GRB 040924: Second Epoch WSRT Radio Observations
  98. radio observations, GRB 040924
  99. IBAS Alert 1991. Not a real GRB
  100. GRB040929,optical observation

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