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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"

42883 results found.

  1. GRB030227:Optical observations
  2. GRB 20030226: Upper limits from recent and historical observations
  3. GRB 030227, possible optical counterpart of XMM-Newton source
  4. GRB030227 - faint tentative OT candidate
  5. GRB 030226, optical observations
  6. XMM-Newton observation of GRB030227
  7. GRB 030227: Kyoto optical observation
  8. GRB 030226, optical light curve
  9. GRB 030226 spectroscopy
  10. GRB030227: refined INTEGRAL position
  11. GRB030227 localized by INTEGRAL
  12. Possible break in the GRB 030226 light curve
  13. GRB 030226 : Predicted light curve
  14. GRB030226: optical observation
  15. IPN triangulation of GRB030225 (annulus)
  16. GRB 030226: Confirmed decay index
  17. GRB030226: ESI spectroscopy
  18. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  19. GRB 030226 simultaneous optical observations
  20. Two absorption systems in GRB 030226
  21. GRB 030226, optical observations
  22. GRB030226: optical observations and refined redshift
  23. GRB030226: Optical decay index
  24. GRB 030226 Optical Spectra and R,I,z' Imaging
  25. GRB 030226: Optical afterglow
  26. GRB030226: Candidate optical afterglow
  27. GRB 030217: Optical Observations at 4, 5, and 6 Days
  28. IPN triangulation of GRB030223 (annulus)
  29. IPN triangulation of GRB030220 (annulus)
  30. GRB: Non-Referencing of GCN Circulars.
  31. IPN triangulation of GRB030218 (annulus)
  32. GRB030217: optical observations
  33. IPN triangulation of GRB030217 (small error box)
  34. IPN triangulation of GRB030215C (annulus)
  35. IPN triangulation of GRB030217 (annulus)
  36. IPN triangulation of GRB030216 (annulus)
  37. IPN triangulation of GRB030215A and GRB030215B (annuli)
  38. GRB030115, WSRT radio observations - correction to GCN 1864
  39. GRB 030131: marginal optical detection
  40. GCN/INTEGRAL Mistake Fixed
  41. GRB030115, WSRT radio observations
  42. IPN triangulation of GRB030206 (annulus)
  43. IPN triangulation of GRB030208 (annulus)
  44. GRB 030204: Optical Observations
  45. GRB030204 field photometry
  46. GRB020819: Kiso R and I band observations
  47. GRB030131: Candidate Optical Afterglow
  48. GRB 030115: Optical Observations
  49. GRB 030204, optical observations
  50. IPN triangulation of GRB030204 (small error box)
  51. IPN triangulation of GRB030202 (annulus)
  52. GRB 030131, optical observations
  53. GRB030131: Kiso optical limit for corrected position
  54. GRB030131: Optical limits for corrected position
  55. GRB 030131: afterglow candidate
  56. GRB 030115, late-time optical observations
  57. GRB030131: corrected INTEGRAL position
  58. Type Ic SN2003L (SN/GRB?), optical spectrum
  59. GRB030131: Kiso Observations
  60. GRB 020819: Host galaxy at Radio Position
  61. IPN triangulation of GRB030131 - CORRECTION
  62. GRB 020819: afterglow candidate
  63. IPN triangulation of GRB030131
  64. GRB030131: Optical limit
  65. GRB 030131 optical observations
  66. GRB030131: refined position
  67. GRB 030131 optical observations
  68. A long GRB detected by INTEGRAL
  69. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  70. Type Ic SN2003L (SN/GRB?) Radio Observations
  71. IPN triangulation of GRB030127 (annulus)
  72. GRB030115 submm upper limit
  73. IPN triangulation of GRB030119 (two large error boxes)
  74. GRB 030115: Further IR observations with IRSF/SIRIUS
  75. IPN triangulation of GRB030117 (two large error boxes)
  76. Publicizing GRB Discoveries - A Message from NASA HQ
  77. GRB 030115: Radio detection of IR candidate
  78. GRB 030115, simultaneous observations by BOOTES-1
  79. GRB 030115: IR observations with IRSF/SIRIUS
  80. IPN triangulation of GRB030115C (large error box)
  81. GRB030115: R-band counterpart of IR candidate
  82. GRB030115, afterglow candidate
  83. GRB 021211: R-band observations at late-time
  84. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  85. IPN triangulation of GRB030115B (small error box)
  86. GRB 030115 : Possible IR counterpart
  87. GRB 030115: Radio Observations
  88. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  89. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  90. IPN triangulation of GRB030115B (annulus)
  91. Distribution of INTEGRAL SPI-ACS triggers
  92. GRB030115: R-band observations at Asiago
  93. GRB030115: TAROT optical observations
  94. GRB 021211: VLT spectrum
  95. GRB 030115: APO Optical Observations
  96. GRB 030115, no optical candidate
  97. GRB 030115, optical observations
  98. GRB 030115, optical candidate
  99. Possible GRB030113 seen by SPI ACS
  100. Probable GRB030112B seen by SPI ACS

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