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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"

28116 results found.

  1. GRB 041219: Infrared Afterglow Candidate
  2. GRB041219, BVRcIc field calibration
  3. GRB 041219: Infrared Afterglow Candidate
  4. GRB041218, BVRcIc field calibration
  5. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  6. GRB 041219 - A long GRB detected by INTEGRAL
  7. GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger
  8. GRB 041217: PROMPT Observations
  9. GRB 041217: LCO40 Optical Observations and Possible Candidates
  10. GRB 041218 - A long GRB detected by integral
  11. GRB041217: NIR and optical observations with REM
  12. GRB041217: Infrared Observations
  13. GRB041217: The First GRB Located On-Board Swift
  14. GRB041211: Faulkes Telescope continued optical monitoring
  15. Optical Transient in Lynx not a GRB
  16. Optical transient (GRB?) in Lynx
  17. GRB041211: RAPTOR observations
  18. GRB041211: Ashra Prototype optical observation
  19. GRB041211, BVRcIc field calibration
  20. GRB041211,optical observation
  21. GRB 041211: Infrared Observations
  22. GRB 041211: KAIT observations
  23. GRB 041211: Optical follow-up in East Asian region
  24. Triangulation of short GRB 041116 (large error box)
  25. GRB 040924: Afterglow Color
  26. GRB 041006: GETS Optical Afterglow Observation
  27. Summary of the recent bursts from SGR 1806-20
  28. GRB 041006: Optical Observations
  29. GRB041006, late-time optical photometry
  30. GRB041006: RTT150 Optical Observations
  31. HST Observations: XRF 040701 and 040812
  32. Bright bursts from SGR1806-20
  33. GRB 041016: BOOTES-2 simultaneous observation
  34. GRB041006: RTT150 Optical Observations
  35. GRB041016,optical observation
  36. GRB 041016: Optical limits
  37. GRB 041016:Optical limit during first minute
  38. GRB 041015: Optical Observations at Rikubetsu
  39. GRB 041016: Optical limit
  40. GRB 041015 R band observations
  41. GRB040924, BVRcIc field calibration
  42. GRB041015,optical observation
  43. GRB041006: Fading X-ray Afterglow Observed with Chandra
  44. GRB 041015 - A long GRB detected by INTEGRAL
  45. GRB041006: VLT observations of the afterglow and host galaxy
  46. GRB041006: Optical observations and Potential host galaxy
  47. GRB041006, BVRcIc field calibration
  48. GRB 040924: VLT spectroscopy
  49. GRB 041006: SARA afterglow observations
  50. GRB041006, optical observation in CrAO
  51. Search for SN light in XRF 040912 with MEGACAM
  52. GRB 041006: BR observations with VATT
  53. GRB 041006: Redshift confirmed
  54. GRB 041006: Radio Observations
  55. GRB 041006 : optical follow-up observation at Lulin Observatory
  56. GRB041006: Optical photometry and spectroscopy at TNG
  57. GRB 041006: presice astrometry
  58. GRB041006, optical I observation
  59. GRB041006 (=HETE3570): optical observations
  60. ROTSE-IIIa Observations of GRB 041006
  61. GRB041006: MASTER optical observations
  62. GRB041006,optical observation
  63. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  64. GRB041006: Fading of optical afterglow candidate
  65. GRB 041006: Optical afterglow candidate
  66. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  67. XRF 020903: Observations of the Host Galaxy
  68. radio observations, GRB 040924
  69. GRB040929,optical observation
  70. GRB040924,optical observation
  71. GRB040924,optical observation
  72. GRB 040924: detection of possible host galaxy by Subaru
  73. GRB040924: KAIT observations
  74. GRB040924 : Optical candidate observations at Lulin observatory
  75. GRB040924 : Optical candidate observations at Lulin observatory
  76. GRB 040924: Subaru NIR observation
  77. XRF 040912: Radio Observations
  78. XRF 040916: Radio Observations
  79. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  80. XRF040916: continuing decay of OT
  81. TAROT Observations of GRB 040916 (HETE #3558)
  82. GRB040912(=H3557): Candidate Optical Afterglow
  83. XRF040916, optical observations
  84. XRF 040912, identification of CXO sources
  85. XRF040912, BVRcIc field calibration
  86. XRF040916, BVRcIc field calibration
  87. GRB040916: Archival optical observations
  88. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  89. GRB040916: Optical observations
  90. GRB040912 (= H3557): Chandra Observations Scheduled
  91. GRB 040912: Optical Observations
  92. GRB/XRF040912,optical observations
  93. GRB 040912, BVRI observations
  94. Optical observations of field of GRB040912
  95. HETE 3557: Optical observations
  96. GRB040903 - A XRF?
  97. GRB040827: analysis of the XMM-Newton observation
  98. GRB040903, REM near-IR observation
  99. Very bright burst detected from SGR 1806-20
  100. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)

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