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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"

23608 results found.

  1. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  2. GRB030324 optical observation
  3. GRB030131, BVRcIc field photometry
  4. IPN triangulation of GRB030325 (final analysis)
  5. GRB030323: Detection on 2003/03/24
  6. IPN triangulation of GRB030326 (single small error box)
  7. GRB 030323: SARA Optical Observations
  8. IPN triangulation of GRB030325 (single small error box)
  9. IPN triangulation of GRB030325 (two small error boxes)
  10. GRB 030324: TAROT optical observations
  11. GRB030323: Upper limits from recent and historical observations.
  12. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  13. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  14. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  15. GRB030324, BVRcIc field photometry
  16. GRB030323, BVRcIc field calibration
  17. GRB 030324, optical observations
  18. IPN triangulation of GRB030320B (annulus)
  19. IPN triangulation of GRB030320 (small error box)
  20. IPN triangulation of GRB030320
  21. Possible GRB 030320 localized by INTEGRAL
  22. IPN upper limit to a GRB associated with SN2003L
  23. IPN triangulation of GRB030317 (annulus)
  24. IPN triangulation of GRB030307 (annulus)
  25. GRB 030227: Optical limit at RIKEN
  26. IPN triangulation of GRB030306 (single small error box - REVISED)
  27. GRB030226: Optical observations at Asiago
  28. IPN triangulation of GRB030306 (single small error box)
  29. IPN triangulation of GRB030306 (two small error boxes)
  30. IPN triangulation of GRB030306 (intense; annulus only so far)
  31. GRB030226: Analysis of Chandra data
  32. GRB030226, BVRc observations
  33. GRB030227, optical observations
  34. GRB 030226: Ic Observations
  35. IPN triangulation of GRB030301 (annulus)
  36. IPN triangulation of GRB030228 (annulus)
  37. GRB030227, BVRcIc field photometry
  38. GRB030226, BVRcIc field calibration
  39. GRB 030227 optical afterglow
  40. GRB 030228, optical observations
  41. GRB 030226: Steep Decline
  42. GRB 030227: Confirmed Optical Afterglow (S1-A)
  43. GRB 030226: R band polarimetric observations
  44. GRB 030227: fading of candidate optical afterglow 'S1-A'
  45. GRB 20030226: Upper limits from recent and historical observations
  46. GRB 030227, possible optical counterpart of XMM-Newton source
  47. GRB030227 - faint tentative OT candidate
  48. GRB 030226, optical observations
  49. XMM-Newton observation of GRB030227
  50. GRB 030227: Kyoto optical observation
  51. GRB 030226 spectroscopy
  52. Possible break in the GRB 030226 light curve
  53. GRB 030226 : Predicted light curve
  54. IPN triangulation of GRB030225 (annulus)
  55. GRB030226: ESI spectroscopy
  56. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  57. GRB 030226 simultaneous optical observations
  58. GRB 030226, optical observations
  59. GRB030226: optical observations and refined redshift
  60. GRB 030226 Optical Spectra and R,I,z' Imaging
  61. GRB 030217: Optical Observations at 4, 5, and 6 Days
  62. IPN triangulation of GRB030223 (annulus)
  63. IPN triangulation of GRB030220 (annulus)
  64. IPN triangulation of GRB030217 (small error box)
  65. IPN triangulation of GRB030215C (annulus)
  66. IPN triangulation of GRB030217 (annulus)
  67. IPN triangulation of GRB030215A and GRB030215B (annuli)
  68. GRB 030131: marginal optical detection
  69. IPN triangulation of GRB030206 (annulus)
  70. GRB 030204: Optical Observations
  71. GRB030204 field photometry
  72. GRB 030115: Optical Observations
  73. GRB 030204, optical observations
  74. IPN triangulation of GRB030204 (small error box)
  75. GRB030131: Kiso optical limit for corrected position
  76. Type Ic SN2003L (SN/GRB?), optical spectrum
  77. GRB030131: Kiso Observations
  78. IPN triangulation of GRB030131
  79. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  80. Type Ic SN2003L (SN/GRB?) Radio Observations
  81. IPN triangulation of GRB030127 (annulus)
  82. GRB030115 submm upper limit
  83. GRB 030115, simultaneous observations by BOOTES-1
  84. IPN triangulation of GRB030115C (large error box)
  85. GRB 021211: R-band observations at late-time
  86. IPN triangulation of GRB030115B (small error box)
  87. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  88. IPN triangulation of GRB030115B (annulus)
  89. GRB030115: R-band observations at Asiago
  90. GRB030115: TAROT optical observations
  91. GRB 021211: VLT spectrum
  92. GRB 030115, no optical candidate
  93. GRB 030115, optical observations
  94. GRB 030115, optical candidate
  95. IPN triangulation of GRB030105 (large error box)
  96. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  97. IPN triangulation of GRB030102A - correction to peak flux
  98. IPN triangulation of GRB030102 (annulus)
  99. IPN triangulation of GRB030101 (two large error boxes)
  100. GRB021226

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