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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

22112 results found.

  1. XMM-Newton Observation of GRB031203
  2. XMM-Newton Observation of GRB031203
  3. GRB 031203: IR NTTobservations do not confirm REM detection
  4. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  5. GRB 031203: Apparent Spectral Break
  6. GRB031203: Planned XMM-Newton observation II
  7. GRB 031203: IR REM Observations
  8. GRB031203: Optical Observations
  9. GRB 031203 XMM-Newton observation
  10. GRB 031203: Optical/IR SMARTS Observations
  11. GRB031203: Planned XMM-Newton observation
  12. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  13. IPN triangulation of GRB031201 (large error box)
  14. IPN triangulation of GRB031130 (large error box)
  15. GRB 030329: Planned XMM-Newton Observation
  16. IPN triangulation of GRB031120 (two large error boxes)
  17. GRB 031111B (= H2925) : Kyoto Optical Observation
  18. IPN detection of activity from SGR1806-20
  19. IPN triangulation of GRB031114 (large error box)
  20. IPN triangulation of GRB031107 (two large error boxes)
  21. GRB 031111, optical observations
  22. IPN triangulation of GRB031111 (=H2924): small error box
  23. IPN triangulation of GRB031108 (large error box)
  24. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  25. GRB030929/SN2003jd association unlikely based on IPN localiztion
  26. IPN triangulation of GRB031027 (small error box)
  27. IPN triangulation of GRB031026B (large error box)
  28. Lulin optical follow-up observations of GRB031026
  29. SN 2003jd (SN/GRB?), Radio Observations
  30. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  31. GRB 031026: Further Ic Observations
  32. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  33. IPN triangulation of GRB031024 (single error box)
  34. GRB031026 : KISO optical follow-up observation
  35. IPN triangulation of GRB031024 (annulus)
  36. IPN triangulation of GRB031020 (large error box)
  37. GRB030329: radio observations at RT-22 (CrAO)
  38. IPN triangulation of GRB031016 (two large error boxes)
  39. IPN triangulation of GRB031014 (annulus)
  40. XRF 030824: additional observations at CFHT
  41. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  42. IPN triangulation of GRB031008 (annulus)
  43. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  44. IPN detection of continued activity from SGR1806-20
  45. IPN triangulation of GRB031007 (two large error boxes)
  46. XRF 030723: Subaru Optical Observations
  47. IPN triangulation of GRB031004B (annulus)
  48. IPN triangulation of GRB030929 (short/hard; annulus)
  49. XRF 030824: Early follow-up observation at Kiso observatory
  50. IPN triangulation of GRB030926 (short/hard; large error box)
  51. IPN triangulation of GRB030922B (large error box)
  52. XRF 030723: Detection of the likely host galaxy
  53. IPN triangulation of GRB030922A (large error box)
  54. IPN triangulation of GRB030921 (large error box)
  55. IPN triangulation of GRB030919 (large error box)
  56. GRB030922 triangulation (annulus)
  57. GRB030913: Subaru Optical Observations
  58. GRB030913: OT's limit by MASTER
  59. GRB030921 triangulation (annulus)
  60. GRB 030913, optical candidate
  61. GRB 030913, BOOTES observations
  62. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  63. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  64. IPN triangulation of GRB030908 (annulus)
  65. XRF030824: Optical observations
  66. IPN triangulation of GRB030903 (large error box)
  67. IBAS detection of bursts from SGR 1806-20
  68. IPN triangulation of GRB030831 (annulus)
  69. IPN triangulation of GRB030830 (large error box)
  70. IPN triangulation of GRB030827 (large error box)
  71. IPN triangulation of GRB030822 (annulus)
  72. GRB030823: optical observations
  73. GRB030823: optical observation at Tokyo Tech
  74. Lulin follow-up observations of GRB030823
  75. IPN triangulation of GRB030821 (=H2814; refined error box)
  76. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  77. IPN triangulation of GRB030814 (annulus)
  78. IPN detection of continued activity from SGR1806-20
  79. GRB 030817 = H2808 TAROT optical observations
  80. SGR 1808-20 (=H2802): A Possible new SGR
  81. IPN triangulation of GRB030808 (two large error boxes)
  82. IPN triangulation of GRB030806 (large burst; large error box)
  83. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  84. XRF030723, BVRcIc field photometry update
  85. IPN triangulation of GRB030801 (large error box)
  86. GRB021206 optical counterpart upper limit
  87. IPN triangulation of GRB030731 (annulus)
  88. IPN triangulation of GRB030725 (=H2779; small error box)
  89. IPN triangulation of GRB030726 (large error box)
  90. IPN triangulation of GRB030722 (large error box)
  91. IPN triangulation of GRB030721 (large error box)
  92. XRF030723 Radio Observations
  93. XRF 030723: confirmation of fading optical counterpart
  94. XRF030723(=H2777): Chandra Observations
  95. GRB030723: Upper limits from historical observations
  96. XRF030723: Palomar observations and proposed counterpart
  97. XRF030723, BVRcIc field photometry correction
  98. XRF030723, ROTSE-III Early Observations
  99. XRF030723, BVRcIc field photometry
  100. XRF 030723, optical observations

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