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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"

12316 results found.

  1. GRB 050607: RTT150 optical observations
  2. GRB050607: refined analysis of prompt REM observations
  3. Swift/UVOT observations of GRB050607
  4. Possible GRB050528: no candidate from Liverpool Telescope
  5. GRB050525a: optical upper limits
  6. GRB 050525: MITSuME Optical Observation in VRI
  7. GRB050525: Super-LOTIS observations
  8. XRF050522: Radio Observations
  9. Swift/UVOT observation of XRF 050522
  10. GRB 050509A: Further I-band imaging
  11. GRB050520: Radio Observations
  12. XRF050509C: Chandra Afterglow Detection
  13. XRF 050509c: Swift XRT Upper Limit
  14. XRF050509c: Radio Observations
  15. GRB 050504: Swift XRT afterglow candidate has faded
  16. Refined Chandra analysis of GRB 050509b
  17. GRB 050509b Milagro GeV/TeV Observations
  18. GRB 050505: SARA Observations
  19. GRB 050509B, Optical Observations
  20. GRB 050509b: Optical observations
  21. GRB 050502a: Swift XRT Upper Limit
  22. GRB050416A : 1 GHz limit from GMRT
  23. GRB 050416b:Swift XRT afterglow upper limits
  24. GRB 050416b:Swift XRT afterglow upper limits
  25. Swift UVOT observation of GRB 050504
  26. Swift UVOT refined analysis
  27. GRB 050422: Swift-UVOT observation
  28. GRB 050421: SLOTIS observations
  29. GRB 050421: Swift-UVOT observation
  30. GRB 050412: Chandra observations
  31. GRB050412: Radio Observations
  32. GRB 050416: ART observations
  33. GRB 050412: Optical limit
  34. GRB 050401: Optical limit
  35. GRB 050408: Optical limit
  36. GRB050410: Radio Observations
  37. GRB050408: REM NIR and Optical observation
  38. GRB050401: Radio observation at 610 MHz with GMRT
  39. GRB050319: radio observation
  40. GRB050319: RTT150 Optical Observations
  41. GRB 050319: Swift-UVOT detection of the afterglow
  42. GRB 050306: ROTSE-III early limits
  43. GRB 050315, SMARTS optical/IR afterglow observations
  44. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  45. GRB 050306: Confirmation of X-ray afterglow
  46. GRB 050306: CORRECTION to date of observation
  47. GRB 050306: No Swift UVOT Optical Counterpart Detected
  48. GRB 050306: REM optical-infrared observations
  49. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  50. GRB 050215b: XRT confirmation of IR afterglow candidate
  51. GRB 050215b: Swift XRT Source Variability
  52. GRB 050215B: candidate afterglow
  53. GRB 050128 Optical observation with REM
  54. GRB050126: Burst Parameters Measured by BAT
  55. GRB 050124, SMARTS optical/IR observations
  56. GRB 050124 I-band observation
  57. SGR1806: Detection of a Sudden Ionospheric Disturbance
  58. GRB041223: optical and NIR observations with REM
  59. GRB 041218: optical observations
  60. Deep RAPTOR observations during GRB 041219
  61. GRB 041218 Optical Observations
  62. GRB 041219 Optical Observations
  63. GRB 041218 : Radio Observations
  64. GRB041015, optical observation in CrAO
  65. GRB041015 : Multi epoch optical observations
  66. GRB 041016: BOOTES-2 simultaneous observation
  67. GRB041006: RTT150 Optical Observations
  68. GRB 041016: Optical limits in V, R, I
  69. GRB041015 : Optical follow-up at Kiso
  70. GRB 041006: Radio Observations
  71. GRB041006, optical I observation
  72. ROTSE-IIIa Observations of GRB 041006
  73. GRB 040924: WSRT Radio Observations
  74. GRB040903, REM near-IR observation
  75. GRB 040903 - INTEGRAL data analysis
  76. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  77. GRB 040827 - Radio Observations
  78. GRB 030324: Detection and Color of Host Galaxy
  79. GRB 040511: NIR observations with REM
  80. GRB 040511: Optical limit
  81. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  82. GRB 040223: REM IJK Observations
  83. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  84. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  85. GRB 031203: IR NTTobservations do not confirm REM detection
  86. GRB 031203: Apparent Spectral Break
  87. GRB 031203: IR REM Observations
  88. SN 2003jd (SN/GRB?) -- X-ray Observations
  89. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  90. SN 2003jd (SN/GRB?), Radio Observations
  91. GRB030329: radio observations at RT-22 (CrAO)
  92. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  93. GRB021206 optical counterpart upper limit
  94. XRF030723: Re-analysis of ROTSE-III early images
  95. GRB030723: Upper limits from historical observations
  96. GRB 021004: HST observations
  97. GRB 030329: Optical limit (contemporaneous imaging)
  98. GRB 030329: Optical limit (contemporaneous photography)
  99. GRB030329: RTT150 optical observations and upper limit for a host
  100. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst

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