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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

3821 results found.

  1. IPN triangulation of GRB030606 (two alternate error boxes)
  2. GRB 030528: tentative NIR counterpart
  3. GRB 030329/SN 2003dh: Jitter Episode
  4. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  5. GRB 030329: Optical limit (contemporaneous imaging)
  6. IPN triangulation of GRB030509 (single error box)
  7. GRB030429, refiend optical brightness
  8. GRB 030329: Optical limit (contemporaneous photography)
  9. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  10. GRB 030329 Optical Observations
  11. GRB030328, optical observation
  12. GRB030429: Optical Observations
  13. GRB030329 observed as a sudden ionospheric disturbance (SID)
  14. OT GRB 030329: early UBVRcIc spectral evolution
  15. GRB030329, UBVRI polarimetry, R-polarization
  16. OT GRB 030329: early spectrum
  17. IPN triangulation of GRB030413 (small error box)
  18. GRB030329: Near Infrared Observations at Gunma
  19. GRB030329: Kiso B and R band observations
  20. GRB030328: R upper limit after 6 hours by MASTER
  21. GRB030329: final R-band light curve by MASTER
  22. GRB030329: optical observations at Tokyo Tech
  23. Further AAVSO V,B,R observations of GRB030329
  24. GRB 030329: Additional Mt. Laguna Optical Observations
  25. GRB 030329: Observations with ANDICAM
  26. GRB030329: Optical observations
  27. GRB 030329: Correction to GCN 2056
  28. GRB 030329: optical observations
  29. GRB 030328, optical photometry
  30. GRB030329: R band light curve by MASTER
  31. GRB030329 - near contemporaneous optical limits from CONCAM
  32. GRB 030329: Optical pre-Imaging
  33. GRB 030329: visual observations
  34. GRB 030329: OT B and R photometry, decline rate
  35. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  36. RXTE detection of GRB 030329 afterglow
  37. GRB 030329: Optical Afterglow Observations
  38. GRB 030328 Optical Observations
  39. GRB030328: Decay index
  40. GRB 030329: OT candidate
  41. GRB030328: optical spectroscopy at TNG
  42. GRB030328: optical photometry at the TNG
  43. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  44. IPN triangulation of GRB030326 (single small error box)
  45. GRB 030323: SARA Optical Observations
  46. IPN triangulation of GRB030325 (two small error boxes)
  47. GRB030323: V, R, I photometry
  48. GRB 030227: fading of candidate optical afterglow 'S1-A'
  49. GRB 030227, possible optical counterpart of XMM-Newton source
  50. GRB030227 - faint tentative OT candidate
  51. XMM-Newton observation of GRB030227
  52. GRB 030227: Kyoto optical observation
  53. GRB030227: refined INTEGRAL position
  54. GRB 030131: marginal optical detection
  55. Probable GRB030112 seen by SPI ACS
  56. VLT spectroscopy of the probable host of GRB 021211
  57. IPN triangulation of GRB021219
  58. IPN detection of continued activity from SGR1806-20
  59. IPN triangulation of GRB021211B (two large error boxes)
  60. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  61. IPN detection of renewed activity from SGR1806-20
  62. GRB 021201: BOOTES simultaneous optical observations
  63. GRB021004, late time optical observations
  64. IPN detection of continued SGR1900+14 activity
  65. IPN confirmation of the reactivation of SGR1900+14
  66. IPN detection of possible reactivation of SGR1900+14
  67. GRB 021113: Evidence for a Dark Optical Afterglow
  68. GRB 021112: RAPTOR Observations
  69. GRB021112 (=H2448): A Long GRB Localized by HETE
  70. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  71. SGR1900+14 activity, November 2-4, 2002
  72. Detection of activity from SGR 1900+14 with the RXTE/PCA
  73. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  74. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  75. IPN triangulation of GRB021020 (smaller error box)
  76. IPN triangulation of GRB021020
  77. GRB021016(=H2397): A Long GRB Localized by HETE
  78. IPN triangulation of GRB021013 (two small error boxes)
  79. GRB021004: BVRc photometry
  80. GRB 021004: Optical Observations
  81. IPN triangulation of GRB020914
  82. IPN detection of a burst from SGR1900+14
  83. IPN triangulation of GRB020715 (=GRB150702)
  84. IPN triangulation of GRB150702
  85. IPN triangulation of GRB020708
  86. IPN triangulation of GRB020708
  87. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  88. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  89. AXP 1E2259+586: quasi-simultaneous optical observation
  90. AXP 1E2259+586 optical observations
  91. SGR-like Bursts from the AXP 1E 2259+586
  92. GRB 020604, optical observations
  93. GRB020604, optical observations
  94. IPN triangulation of GRB020604
  95. GRB020531: Optical observations
  96. GRB020525, optical observations
  97. IPN detection of possible bursts from SGR1806-20
  98. IPN triangulation of GRB020525
  99. XRF 020427: Sudden Ionospheric Disturbance (SID)
  100. Mars Odyssey joins the IPN

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