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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.

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

27779 results found.

  1. GRB 030329 VLBA Observations
  2. GRB 030329: Sub-millimeter detection
  3. GRB 030329: Radio observations at GMRT
  4. GRB030329a: detection by Konus-Wind
  5. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  6. RXTE detection of GRB 030329 afterglow
  7. Possible GRB030323 localized by INTEGRAL
  8. GRB030323: Detection on 2003/03/24
  9. VLT/FORS2 spectra of GRB 030323
  10. GRB030323, ROTSE-III detection of possible optical counterpart
  11. Possible GRB 030320 localized by INTEGRAL
  12. GRB030226: Analysis of Chandra data
  13. Chandra detection of the X-ray afterglow of GRB 030226
  14. GRB 030228, optical observations
  15. GRB030227 localized by INTEGRAL
  16. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  17. GRB 030217: Optical Observations at 4, 5, and 6 Days
  18. GRB030115, WSRT radio observations - correction to GCN 1864
  19. GRB 030131: marginal optical detection
  20. GRB030115, WSRT radio observations
  21. A long GRB detected by INTEGRAL
  22. GRB 030115: Radio detection of IR candidate
  23. GRB 030115: IR observations with IRSF/SIRIUS
  24. GRB030115: R-band counterpart of IR candidate
  25. GRB030115: TAROT optical observations
  26. GRB 030115, optical candidate
  27. GRB 021112: Evidence for Another Dark Optical Afterglow
  28. GRB021219: a long GRB localized by INTEGRAL
  29. IPN detection of continued activity from SGR1806-20
  30. GRB 021211, optical observations
  31. GRB021211: Measurement of Early Time Afterglow
  32. IPN detection of renewed activity from SGR1806-20
  33. IPN detection of continued SGR1900+14 activity
  34. GRB021125 : A long GRB localized by INTEGRAL
  35. IPN detection of possible reactivation of SGR1900+14
  36. GRB 021113: Evidence for a Dark Optical Afterglow
  37. Detection of activity from SGR 1900+14 with the RXTE/PCA
  38. GRB 020813; likely host galaxy.
  39. GRB 021008, optical observations
  40. GRB 021004: optical spectroscopy on Oct 11
  41. GRB021004: optical observation
  42. GRB 021004: WC wind?
  43. GRB 021004: Optical observations, AUDE network
  44. GRB 021004: optical spectroscopy
  45. IRAM Millimeter detection of GRB 021004
  46. GRB 021004 radio search
  47. XRF 020903: optical observation at Kyoto
  48. GRB020322 : HST/STIS observations
  49. IPN detection of a burst from SGR1900+14
  50. XRF 020903, optical observations
  51. Confirming no variability for GRB02081
  52. GRB020813: Early Time Magnitude
  53. GRB 020813, radio detection
  54. GRB020812: optical observations
  55. GRB 020813 multiband optical observations
  56. HST Imaging of the Host of GRB 011121
  57. GRB 020410: Discovery of Probable OT by HST
  58. GRB 020625, optical observations
  59. GRB/XRF 020427, detection of an underlying system with the VLT
  60. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  61. AXP 1E2259+586: quasi-simultaneous optical observation
  62. AXP 1E2259+586 optical observations
  63. GRB 020531, simultaneous optical observations
  64. GRB020531: Detection of Candidate Host Galaxy
  65. GRB020531: Upper Limit for Detection of Two TAROT Sources
  66. IPN detection of possible bursts from SGR1806-20
  67. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  68. HST detection of the likely host galaxy of GRB 020124
  69. The end of BSAX GRB activities
  70. GRB 020124: Optical observations
  71. GRB020410: BeppoSAX NFI observations refined analysis
  72. Mars Odyssey joins the IPN
  73. GRB020405: predicted break
  74. GRB 020409, No Optical Detection to R = 22
  75. GRB 020331 Kyoto observation on March 31
  76. GRB 020409
  77. GRB 020409, No Optical Detection to R = 20
  78. X-ray afterglow of GRB020321
  79. ASM GRB candidate 020406 refined error box
  80. GRB020331: Optical Observations of Afterglow Candidate
  81. GRB020406(?), optical observations
  82. GRB 020405, U-band observations
  83. GRB011212: Optical Observations
  84. GRB 020322: Optical Observations
  85. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  86. GRB 020322 optical observation
  87. GRB020322, optical observations
  88. GRB020321: BeppoSAX/NFI Observations
  89. GRB020321: a faint BeppoSAX detection
  90. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  91. GRB020317, optical observations
  92. GRB 011121: HST Observations reveal an intermediate-time multicolor
  93. XRF/GRB 011030: Detection of the Probable Host Galaxy
  94. GRB020305 (=H1939): Localization of a GRB by HETE
  95. IPN detection and localization of Cygnus X-1 flares
  96. GRB020127: Further VLA Observations of Possible Counterparts
  97. IPN detection of further SGR1900+14 activity
  98. IPN/HETE Detection of Bursts from SGR1900+14
  99. GRB020127: Palomar and VLA Observations of Possible Counterparts
  100. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts

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