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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"

14819 results found.

  1. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  2. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  3. INTEGRAL detection of activity from SGR1806-20
  4. GRB 040223 : Optical observation (non-detection)
  5. GRB040106, likely optical afterglow
  6. GRB031203: K' Photometry of the likely GRB host
  7. GRB 031203: Radio detection
  8. GRB 031203: IR NTTobservations do not confirm REM detection
  9. IPN detection of activity from SGR1806-20
  10. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  11. IPN detection of continued activity from SGR1806-20
  12. XRF 030723: Subaru Optical Observations
  13. XRF 030723: Detection of the likely host galaxy
  14. GRB 030913, optical candidate
  15. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  16. IBAS detection of bursts from SGR 1806-20
  17. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  18. IPN detection of continued activity from SGR1806-20
  19. XRF 030723: Detection of a rebrightening in the optical afterglow
  20. XRF030723: Re-analysis of ROTSE-III early images
  21. GRB 030725: optical observations.
  22. GRB030725, optical transient observations
  23. XRF030723 Radio Observations
  24. GRB030725, possible optical transient
  25. XRF030723: Palomar observations and proposed counterpart
  26. XRF 030723, optical observations
  27. Konus-Wind detection of the bursts from SGR1806-20 region
  28. IPN detection of renewed activity from SGR1806-20
  29. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  30. HETE detection of burst from SGR1806-20
  31. GRB 021206, Radio afterglow candidate
  32. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  33. GRB030501 localized by INTEGRAL
  34. GRB030329 observed as a sudden ionospheric disturbance (SID)
  35. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  36. OT GRB 030329: early spectrum
  37. GRB 030329 VLBA Observations
  38. GRB 030329: Sub-millimeter detection
  39. GRB 030329: Radio observations at GMRT
  40. GRB030329a: detection by Konus-Wind
  41. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  42. GRB 030329, optical spectroscopy
  43. GRB 030329: visual observations
  44. RXTE detection of GRB 030329 afterglow
  45. Possible GRB030323 localized by INTEGRAL
  46. GRB030323: Detection on 2003/03/24
  47. VLT/FORS2 spectra of GRB 030323
  48. GRB030323, ROTSE-III detection of possible optical counterpart
  49. Possible GRB 030320 localized by INTEGRAL
  50. GRB030226: Analysis of Chandra data
  51. Chandra detection of the X-ray afterglow of GRB 030226
  52. GRB 030228, optical observations
  53. GRB030227 localized by INTEGRAL
  54. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  55. GRB 030217: Optical Observations at 4, 5, and 6 Days
  56. GRB030115, WSRT radio observations - correction to GCN 1864
  57. GRB 030131: marginal optical detection
  58. GRB030115, WSRT radio observations
  59. A long GRB detected by INTEGRAL
  60. GRB 030115: Radio detection of IR candidate
  61. GRB 030115: IR observations with IRSF/SIRIUS
  62. GRB030115: R-band counterpart of IR candidate
  63. GRB030115: TAROT optical observations
  64. GRB 030115, optical candidate
  65. GRB 021112: Evidence for Another Dark Optical Afterglow
  66. GRB021219: a long GRB localized by INTEGRAL
  67. IPN detection of continued activity from SGR1806-20
  68. GRB 021211, optical observations
  69. GRB021211: Measurement of Early Time Afterglow
  70. IPN detection of renewed activity from SGR1806-20
  71. IPN detection of continued SGR1900+14 activity
  72. GRB021125 : A long GRB localized by INTEGRAL
  73. IPN detection of possible reactivation of SGR1900+14
  74. GRB 021113: Evidence for a Dark Optical Afterglow
  75. Detection of activity from SGR 1900+14 with the RXTE/PCA
  76. GRB 020813; likely host galaxy.
  77. GRB 021008, optical observations
  78. GRB 021004: optical spectroscopy on Oct 11
  79. GRB021004: optical observation
  80. GRB 021004: WC wind?
  81. GRB 021004: Optical observations, AUDE network
  82. GRB 021004: optical spectroscopy
  83. IRAM Millimeter detection of GRB 021004
  84. GRB 021004 radio search
  85. XRF 020903: optical observation at Kyoto
  86. GRB020322 : HST/STIS observations
  87. IPN detection of a burst from SGR1900+14
  88. XRF 020903, optical observations
  89. Confirming no variability for GRB02081
  90. GRB020813: Early Time Magnitude
  91. GRB 020813, radio detection
  92. GRB020812: optical observations
  93. GRB 020813 multiband optical observations
  94. HST Imaging of the Host of GRB 011121
  95. GRB 020410: Discovery of Probable OT by HST
  96. GRB 020625, optical observations
  97. GRB/XRF 020427, detection of an underlying system with the VLT
  98. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  99. AXP 1E2259+586: quasi-simultaneous optical observation
  100. AXP 1E2259+586 optical observations

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