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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"

45499 results found.

  1. GRB030226, BVRc observations
  2. Chandra detection of the X-ray afterglow of GRB 030226
  3. GRB 030226, further optical/NIR imaging
  4. GRB030227, optical observations
  5. GRB 030226: Ic Observations
  6. GRB030227: Kiso optical upper limit
  7. IPN triangulation of GRB030301 (annulus)
  8. IPN triangulation of GRB030228 (annulus)
  9. GRB030227, BVRcIc field photometry
  10. GRB030226, BVRcIc field calibration
  11. 030302: NOT A GRB
  12. 030228: NOT A GRB
  13. GRB 030228, optical observations
  14. GRB 030226: Steep Decline
  15. GRB 030227: Confirmed Optical Afterglow (S1-A)
  16. GRB 030226: R band polarimetric observations
  17. GRB 030226: Optical observations
  18. GRB 030227: fading of candidate optical afterglow 'S1-A'
  19. GRB030227:Optical observations
  20. GRB 20030226: Upper limits from recent and historical observations
  21. GRB 030227, possible optical counterpart of XMM-Newton source
  22. GRB030227 - faint tentative OT candidate
  23. GRB 030226, optical observations
  24. XMM-Newton observation of GRB030227
  25. GRB030227: Kiso optical observations
  26. GRB 030227: Kyoto optical observation
  27. GRB 030226, optical light curve
  28. GRB 030226 spectroscopy
  29. GRB030227: refined INTEGRAL position
  30. GRB030227 localized by INTEGRAL
  31. Possible break in the GRB 030226 light curve
  32. GRB 030226 : Predicted light curve
  33. GRB030226: optical observation
  34. IPN triangulation of GRB030225 (annulus)
  35. GRB 030226: Confirmed decay index
  36. GRB030226: ESI spectroscopy
  37. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  38. GRB 030226 simultaneous optical observations
  39. Two absorption systems in GRB 030226
  40. GRB 030226, optical observations
  41. GRB030226: optical observations and refined redshift
  42. GRB030226: Optical decay index
  43. GRB 030226 Optical Spectra and R,I,z' Imaging
  44. GRB 030226, optical observations
  45. GRB 030226: Optical afterglow
  46. GRB030226: Candidate optical afterglow
  47. GRB 030217: Optical Observations at 4, 5, and 6 Days
  48. IPN triangulation of GRB030223 (annulus)
  49. IPN triangulation of GRB030220 (annulus)
  50. GRB: Non-Referencing of GCN Circulars.
  51. IPN triangulation of GRB030218 (annulus)
  52. GRB030217: optical observations
  53. IPN triangulation of GRB030217 (small error box)
  54. IPN triangulation of GRB030215C (annulus)
  55. IPN triangulation of GRB030217 (annulus)
  56. IPN triangulation of GRB030216 (annulus)
  57. IPN triangulation of GRB030215A and GRB030215B (annuli)
  58. GRB030115, WSRT radio observations - correction to GCN 1864
  59. GRB 030131: marginal optical detection
  60. GCN/INTEGRAL Mistake Fixed
  61. GRB030115, WSRT radio observations
  62. IPN triangulation of GRB030206 (annulus)
  63. IPN triangulation of GRB030208 (annulus)
  64. GRB 030204: Optical Observations
  65. GRB030204 field photometry
  66. GRB020819: Kiso R and I band observations
  67. GRB030131: Candidate Optical Afterglow
  68. GRB 030115: Optical Observations
  69. GRB 030204, optical observations
  70. IPN triangulation of GRB030204 (small error box)
  71. IPN triangulation of GRB030202 (annulus)
  72. GRB 030131, optical observations
  73. GRB030131: Kiso optical limit for corrected position
  74. GRB030131: Optical limits for corrected position
  75. GRB 030131: afterglow candidate
  76. GRB 030115, late-time optical observations
  77. GRB030131: corrected INTEGRAL position
  78. Type Ic SN2003L (SN/GRB?), optical spectrum
  79. GRB030131: Kiso Observations
  80. GRB 020819: Host galaxy at Radio Position
  81. IPN triangulation of GRB030131 - CORRECTION
  82. GRB 020819: afterglow candidate
  83. IPN triangulation of GRB030131
  84. GRB030131: Optical limit
  85. GRB 030131 optical observations
  86. GRB030131: refined position
  87. GRB 030131 optical observations
  88. A long GRB detected by INTEGRAL
  89. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  90. Type Ic SN2003L (SN/GRB?) Radio Observations
  91. IPN triangulation of GRB030127 (annulus)
  92. GRB030115 submm upper limit
  93. IPN triangulation of GRB030119 (two large error boxes)
  94. GRB 030115: Further IR observations with IRSF/SIRIUS
  95. IPN triangulation of GRB030117 (two large error boxes)
  96. Publicizing GRB Discoveries - A Message from NASA HQ
  97. GRB 030115: Radio detection of IR candidate
  98. GRB 030115, simultaneous observations by BOOTES-1
  99. GRB 030115: IR observations with IRSF/SIRIUS
  100. IPN triangulation of GRB030115C (large error box)

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