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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"

45676 results found.

  1. Possible GRB030111 seen by SPI ACS
  2. Possible GRB030110b seen by SPI ACS
  3. Possible GRB 030110 seen by SPI ACS
  4. IPN triangulation of GRB030109 (annulus)
  5. IPN triangulation of GRB030105 (large error box)
  6. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  7. Possible GRB 20030109 seen by SPI ACS
  8. IPN triangulation of GRB030102A - correction to peak flux
  9. IPN triangulation of GRB030102B (portion of annulus)
  10. IPN triangulation of GRB030102A (large error box)
  11. Coronas-F -Wind triangulation of GRB030102
  12. Possible GRB20030107 seen by SPI-ACS
  13. Possible GRB 20030105 seen by SPI ACS
  14. IPN triangulation of GRB030102 (annulus)
  15. GRB on 20030102 seen by SPI-ACS
  16. VLT spectroscopy of the probable host of GRB 021211
  17. GRB on 20030101 seen by SPI-ACS
  18. IPN triangulation of GRB030101 (two large error boxes)
  19. GRB021226
  20. GRB 021211: Probable Host and Underlying Supernova
  21. GRB 021226 registration by Helicon/Coronas-F
  22. Probable GRB in INTEGRAL SPI-ACS
  23. IPN triangulation of GRB021223 (two large error boxes)
  24. GRB021211, radio observations
  25. GRB 021112: Evidence for Another Dark Optical Afterglow
  26. GRB 021219: OSN optical observations
  27. GRB021219: Radio Observations
  28. GRB021219, optical observations
  29. IPN triangulation of GRB021219 - CORRECTION
  30. IPN triangulation of GRB021219
  31. GRB021219, optical observation by MASTER
  32. GRB021219: Correction to GCN 1766
  33. GRB021219 refined position with INTEGRAL
  34. VLT spectra of GRB 021211 revisited
  35. GRB021219: a long GRB localized by INTEGRAL
  36. GRB021211: APO optical observations
  37. IPN detection of continued activity from SGR1806-20
  38. IPN triangulation of GRB021215 (large error box)
  39. IPN triangulation of GRB021214 (annulus)
  40. XRF 020903 : HST observations
  41. GRB 021201: Optical Observations
  42. GRB 021211, optical observations
  43. GRB 021211: CTIO observations
  44. GRB021211: Measurement of Early Time Afterglow
  45. VLT spectrum of GRB 021211
  46. IPN triangulation of GRB021211B (two large error boxes)
  47. GRB 021211: early break in light curve
  48. GRB021211, BVRI field photometry
  49. GRB021211: Optical observations in CrAO
  50. GRB 021211, IR observations
  51. GRB 021211, optical observations
  52. GRB 021211: Optical Observations
  53. GRB021211: Kiso Observations
  54. GRB021204: Kiso Observations
  55. GRB 021201, optical observations
  56. GRB 021211: Radio Observations
  57. GRB021211: Optical observations
  58. GRB 021201 (short/hard), NOT observations
  59. SUB-MM SEARCH FOR GRB 021211
  60. Chandra observation of the IPN error box of GRB021201 (short/hard)
  61. GRB 021211 Milagro GeV/TeV Observations
  62. GRB 021211, R- and I-band observations
  63. GRB021211 - Upper limits from recent and historical observations
  64. GRB021211, OT at 108 s
  65. GRB021211 (HETE2493), OT at 143 sec
  66. GRB 021204: I-band Observations
  67. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  68. HETE 2493: Optical observations
  69. HETE 2493: Optical candidate
  70. GRB 021204: Optical Observations at RIKEN
  71. GRB 021125: Radio Observations
  72. IPN triangulation of GRB021206 (small error box)
  73. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  74. IPN detection of renewed activity from SGR1806-20
  75. IPN triangulation of GRB021205 (large error box)
  76. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  77. GRB021201, BVRcIc field photometry
  78. GRB 021201, Radio Observations
  79. GRB 021201: Optical Observations
  80. GRB 021201: BOOTES simultaneous optical observations
  81. IPN triangulation of GRB021201 (short/hard burst, small error box)
  82. Radio Catalog of GRB Afterglows
  83. GRB021004, late time optical observations
  84. GRB021004 Chandra Observation
  85. IPN detection of continued SGR1900+14 activity
  86. GRB021125 refined position
  87. IPN triangulation of GRB021115 (annulus)
  88. IPN triangulation of GRB021125B (two large error boxes)
  89. IPN triangulation of GRB021119 (large error box)
  90. IPN triangulation of GRB021125B (annulus)
  91. Improved IPN error box for GRB021125
  92. IPN triangulation of GRB021125 (INTEGRAL BURST)
  93. GRB021125 : A long GRB localized by INTEGRAL
  94. IPN confirmation of the reactivation of SGR1900+14
  95. IPN detection of possible reactivation of SGR1900+14
  96. GRB021113, SPI ACS observation
  97. IPN triangulation of GRB021119 (annulus)
  98. GRB 021112: Afterglow or Variable Star?
  99. GRB021113: optical observations at Bisei
  100. GRB 021113: Evidence for a Dark Optical Afterglow

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