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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"

42853 results found.

  1. IPN triangulation of GRB030218 (annulus)
  2. GRB030217: optical observations
  3. IPN triangulation of GRB030217 (small error box)
  4. IPN triangulation of GRB030215C (annulus)
  5. IPN triangulation of GRB030217 (annulus)
  6. IPN triangulation of GRB030216 (annulus)
  7. IPN triangulation of GRB030215A and GRB030215B (annuli)
  8. GRB030115, WSRT radio observations - correction to GCN 1864
  9. GRB 030131: marginal optical detection
  10. GCN/INTEGRAL Mistake Fixed
  11. GRB030115, WSRT radio observations
  12. IPN triangulation of GRB030206 (annulus)
  13. IPN triangulation of GRB030208 (annulus)
  14. GRB 030204: Optical Observations
  15. GRB030204 field photometry
  16. GRB020819: Kiso R and I band observations
  17. GRB030131: Candidate Optical Afterglow
  18. GRB 030115: Optical Observations
  19. GRB 030204, optical observations
  20. IPN triangulation of GRB030204 (small error box)
  21. IPN triangulation of GRB030202 (annulus)
  22. GRB 030131, optical observations
  23. GRB030131: Kiso optical limit for corrected position
  24. GRB030131: Optical limits for corrected position
  25. GRB 030131: afterglow candidate
  26. GRB 030115, late-time optical observations
  27. GRB030131: corrected INTEGRAL position
  28. Type Ic SN2003L (SN/GRB?), optical spectrum
  29. GRB030131: Kiso Observations
  30. GRB 020819: Host galaxy at Radio Position
  31. IPN triangulation of GRB030131 - CORRECTION
  32. GRB 020819: afterglow candidate
  33. IPN triangulation of GRB030131
  34. GRB030131: Optical limit
  35. GRB 030131 optical observations
  36. GRB030131: refined position
  37. GRB 030131 optical observations
  38. A long GRB detected by INTEGRAL
  39. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  40. Type Ic SN2003L (SN/GRB?) Radio Observations
  41. IPN triangulation of GRB030127 (annulus)
  42. GRB030115 submm upper limit
  43. IPN triangulation of GRB030119 (two large error boxes)
  44. GRB 030115: Further IR observations with IRSF/SIRIUS
  45. IPN triangulation of GRB030117 (two large error boxes)
  46. Publicizing GRB Discoveries - A Message from NASA HQ
  47. GRB 030115: Radio detection of IR candidate
  48. GRB 030115, simultaneous observations by BOOTES-1
  49. GRB 030115: IR observations with IRSF/SIRIUS
  50. IPN triangulation of GRB030115C (large error box)
  51. GRB030115: R-band counterpart of IR candidate
  52. GRB030115, afterglow candidate
  53. GRB 021211: R-band observations at late-time
  54. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  55. IPN triangulation of GRB030115B (small error box)
  56. GRB 030115 : Possible IR counterpart
  57. GRB 030115: Radio Observations
  58. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  59. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  60. IPN triangulation of GRB030115B (annulus)
  61. Distribution of INTEGRAL SPI-ACS triggers
  62. GRB030115: R-band observations at Asiago
  63. GRB030115: TAROT optical observations
  64. GRB 021211: VLT spectrum
  65. GRB 030115: APO Optical Observations
  66. GRB 030115, no optical candidate
  67. GRB 030115, optical observations
  68. GRB 030115, optical candidate
  69. Possible GRB030113 seen by SPI ACS
  70. Probable GRB030112B seen by SPI ACS
  71. Probable GRB030112 seen by SPI ACS
  72. Information about where HETE will be pointing
  73. Possible GRB030111 seen by SPI ACS
  74. Possible GRB030110b seen by SPI ACS
  75. Possible GRB 030110 seen by SPI ACS
  76. IPN triangulation of GRB030109 (annulus)
  77. IPN triangulation of GRB030105 (large error box)
  78. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  79. IPN triangulation of GRB030102B (portion of annulus)
  80. IPN triangulation of GRB030102A (large error box)
  81. Coronas-F -Wind triangulation of GRB030102
  82. Possible GRB20030107 seen by SPI-ACS
  83. IPN triangulation of GRB030102 (annulus)
  84. VLT spectroscopy of the probable host of GRB 021211
  85. IPN triangulation of GRB030101 (two large error boxes)
  86. GRB021226
  87. GRB 021211: Probable Host and Underlying Supernova
  88. GRB 021226 registration by Helicon/Coronas-F
  89. Probable GRB in INTEGRAL SPI-ACS
  90. IPN triangulation of GRB021223 (two large error boxes)
  91. GRB021211, radio observations
  92. GRB 021112: Evidence for Another Dark Optical Afterglow
  93. GRB 021219: OSN optical observations
  94. GRB021219: Radio Observations
  95. GRB021219, optical observations
  96. IPN triangulation of GRB021219 - CORRECTION
  97. IPN triangulation of GRB021219
  98. GRB021219 refined position with INTEGRAL
  99. VLT spectra of GRB 021211 revisited
  100. GRB021219: a long GRB localized by INTEGRAL

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