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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

36180 results found.

  1. GRB 030131: afterglow candidate
  2. GRB 030115, late-time optical observations
  3. GRB030131: corrected INTEGRAL position
  4. Type Ic SN2003L (SN/GRB?), optical spectrum
  5. GRB030131: Kiso Observations
  6. GRB 020819: Host galaxy at Radio Position
  7. IPN triangulation of GRB030131 - CORRECTION
  8. GRB 020819: afterglow candidate
  9. IPN triangulation of GRB030131
  10. GRB 030131 optical observations
  11. GRB 030131 optical observations
  12. A long GRB detected by INTEGRAL
  13. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  14. Type Ic SN2003L (SN/GRB?) Radio Observations
  15. IPN triangulation of GRB030127 (annulus)
  16. GRB030115 submm upper limit
  17. IPN triangulation of GRB030119 (two large error boxes)
  18. GRB 030115: Further IR observations with IRSF/SIRIUS
  19. IPN triangulation of GRB030117 (two large error boxes)
  20. Publicizing GRB Discoveries - A Message from NASA HQ
  21. GRB 030115: Radio detection of IR candidate
  22. GRB 030115, simultaneous observations by BOOTES-1
  23. GRB 030115: IR observations with IRSF/SIRIUS
  24. IPN triangulation of GRB030115C (large error box)
  25. GRB030115: R-band counterpart of IR candidate
  26. GRB030115, afterglow candidate
  27. GRB 021211: R-band observations at late-time
  28. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  29. IPN triangulation of GRB030115B (small error box)
  30. GRB 030115 : Possible IR counterpart
  31. GRB 030115: Radio Observations
  32. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  33. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  34. IPN triangulation of GRB030115B (annulus)
  35. ANNOUNCEMENT ON INTEGRAL GRB ALERTS
  36. Distribution of INTEGRAL SPI-ACS triggers
  37. GRB030115: R-band observations at Asiago
  38. GRB030115: TAROT optical observations
  39. GRB 021211: VLT spectrum
  40. GRB 030115: APO Optical Observations
  41. GRB 030115, no optical candidate
  42. GRB 030115, optical observations
  43. GRB 030115, optical candidate
  44. Possible GRB030113 seen by SPI ACS
  45. Probable GRB030112B seen by SPI ACS
  46. Probable GRB030112 seen by SPI ACS
  47. Possible GRB030111 seen by SPI ACS
  48. Possible GRB030110b seen by SPI ACS
  49. Possible GRB 030110 seen by SPI ACS
  50. IPN triangulation of GRB030109 (annulus)
  51. IPN triangulation of GRB030105 (large error box)
  52. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  53. Possible GRB 20030109 seen by SPI ACS
  54. IPN triangulation of GRB030102B (portion of annulus)
  55. IPN triangulation of GRB030102A (large error box)
  56. Possible GRB20030107 seen by SPI-ACS
  57. Possible GRB 20030105 seen by SPI ACS
  58. IPN triangulation of GRB030102 (annulus)
  59. GRB on 20030102 seen by SPI-ACS
  60. VLT spectroscopy of the probable host of GRB 021211
  61. GRB on 20030101 seen by SPI-ACS
  62. IPN triangulation of GRB030101 (two large error boxes)
  63. GRB021226
  64. GRB 021211: Probable Host and Underlying Supernova
  65. GRB 021226 registration by Helicon/Coronas-F
  66. Probable GRB in INTEGRAL SPI-ACS
  67. IPN triangulation of GRB021223 (two large error boxes)
  68. GRB021211, radio observations
  69. GRB 021112: Evidence for Another Dark Optical Afterglow
  70. GRB 021219: OSN optical observations
  71. GRB021219: Radio Observations
  72. IPN triangulation of GRB021219 - CORRECTION
  73. IPN triangulation of GRB021219
  74. GRB021219, optical observation by MASTER
  75. GRB021219: Correction to GCN 1766
  76. VLT spectra of GRB 021211 revisited
  77. GRB021219: a long GRB localized by INTEGRAL
  78. IPN detection of continued activity from SGR1806-20
  79. IPN triangulation of GRB021215 (large error box)
  80. IPN triangulation of GRB021214 (annulus)
  81. XRF 020903 : HST observations
  82. GRB 021201: Optical Observations
  83. GRB 021211, optical observations
  84. GRB 021211: CTIO observations
  85. GRB021211: Measurement of Early Time Afterglow
  86. VLT spectrum of GRB 021211
  87. IPN triangulation of GRB021211B (two large error boxes)
  88. GRB 021211: early break in light curve
  89. GRB021211, BVRI field photometry
  90. GRB 021211, IR observations
  91. GRB 021211, optical observations
  92. GRB 021211: Optical Observations
  93. GRB021211: Kiso Observations
  94. GRB021204: Kiso Observations
  95. GRB 021201, optical observations
  96. GRB 021211: Radio Observations
  97. GRB 021201 (short/hard), NOT observations
  98. SUB-MM SEARCH FOR GRB 021211
  99. GRB 021211 Milagro GeV/TeV Observations
  100. GRB 021211, R- and I-band observations

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