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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"

26363 results found.

  1. XMM-Newton observation of GRB030227
  2. GRB030227: Kiso optical observations
  3. GRB 030227: Kyoto optical observation
  4. GRB 030226, optical light curve
  5. GRB030227 localized by INTEGRAL
  6. GRB 030226 : Predicted light curve
  7. GRB030226: ESI spectroscopy
  8. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  9. GRB 030226 simultaneous optical observations
  10. GRB 030226, optical observations
  11. GRB030226: Optical decay index
  12. GRB 030226 Optical Spectra and R,I,z' Imaging
  13. GRB: Non-Referencing of GCN Circulars.
  14. IPN triangulation of GRB030217 (small error box)
  15. GRB 030131: marginal optical detection
  16. GRB 030204: Optical Observations
  17. GRB030204 field photometry
  18. GRB020819: Kiso R and I band observations
  19. GRB030131: Candidate Optical Afterglow
  20. IPN triangulation of GRB030204 (small error box)
  21. GRB 030131, optical observations
  22. GRB 030131: afterglow candidate
  23. GRB 030115, late-time optical observations
  24. GRB030131: corrected INTEGRAL position
  25. GRB 020819: Host galaxy at Radio Position
  26. IPN triangulation of GRB030131
  27. GRB 030131 optical observations
  28. GRB 030131 optical observations
  29. A long GRB detected by INTEGRAL
  30. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  31. GRB 030115, simultaneous observations by BOOTES-1
  32. GRB 030115: IR observations with IRSF/SIRIUS
  33. IPN triangulation of GRB030115C (large error box)
  34. GRB030115, afterglow candidate
  35. GRB 021211: R-band observations at late-time
  36. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  37. GRB 030115 : Possible IR counterpart
  38. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  39. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  40. GRB 030115: APO Optical Observations
  41. Information about where HETE will be pointing
  42. VLT spectroscopy of the probable host of GRB 021211
  43. IPN triangulation of GRB030101 (two large error boxes)
  44. GRB 021211: Probable Host and Underlying Supernova
  45. GRB 021112: Evidence for Another Dark Optical Afterglow
  46. GRB 021219: OSN optical observations
  47. GRB021219, optical observations
  48. GRB021219, optical observation by MASTER
  49. VLT spectra of GRB 021211 revisited
  50. GRB021219: a long GRB localized by INTEGRAL
  51. GRB021211: APO optical observations
  52. XRF 020903 : HST observations
  53. GRB 021201: Optical Observations
  54. GRB 021211: CTIO observations
  55. GRB021211, BVRI field photometry
  56. GRB021211: Optical observations in CrAO
  57. GRB 021211, optical observations
  58. GRB021211: Kiso Observations
  59. GRB 021201, optical observations
  60. GRB021211: Optical observations
  61. GRB 021201 (short/hard), NOT observations
  62. SUB-MM SEARCH FOR GRB 021211
  63. Chandra observation of the IPN error box of GRB021201 (short/hard)
  64. GRB 021211, R- and I-band observations
  65. GRB021211 - Upper limits from recent and historical observations
  66. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  67. IPN triangulation of GRB021206 (small error box)
  68. IPN triangulation of GRB021205 (large error box)
  69. GRB021201, BVRcIc field photometry
  70. GRB 021201: BOOTES simultaneous optical observations
  71. IPN triangulation of GRB021201 (short/hard burst, small error box)
  72. GRB021004, late time optical observations
  73. GRB021004 Chandra Observation
  74. IPN detection of continued SGR1900+14 activity
  75. Improved IPN error box for GRB021125
  76. IPN BURST POSITION
  77. IPN triangulation of GRB021125 (INTEGRAL BURST)
  78. GRB021125 : A long GRB localized by INTEGRAL
  79. IPN confirmation of the reactivation of SGR1900+14
  80. GRB021113, SPI ACS observation
  81. GRB 021112: Afterglow or Variable Star?
  82. GRB021113: optical observations at Bisei
  83. GRB 021113: Evidence for a Dark Optical Afterglow
  84. GRB021112, BVRI field photometry
  85. GRB 021112: Variable Source in R-band search
  86. GRB021112: Optical Observations
  87. IPN triangulation of GRB021113 (=H2449; annulus)
  88. GRB 021113: Optical observations
  89. GRB 021112: RAPTOR Observations
  90. GRB021113 (=H2449): A Long GRB Localized by HETE
  91. GRB021112 (=H2448): A Long GRB Localized by HETE
  92. GRB 021016: Optical Observations
  93. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  94. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  95. SGR1900+14 activity, November 2-4, 2002
  96. GRB021104: optical observations
  97. Detection of activity from SGR 1900+14 with the RXTE/PCA
  98. IPN triangulation of GRB021027 (single large error box)
  99. IPN triangulation of GRB021027 (two large error boxes)
  100. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization

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